ES51928_技术文档

ES51928

6000 Counts Smart DMM

Features

General description

z

6000 counts LCD display

3V DC power supply

ES51928 is an integrated ADC with 6000 counts

LCD display driver. It could support fully

automatic DMM function measurement. In

voltage or current mode, the AC or DC signals

auto scanning. In R/D/C (passive component)

Conversion rate: 3 times/s (voltage mode)

Full automatic measurement:

*Voltage/Current: AC/DC auto scanning

& auto range: 6.000V~1000V

*Resistance/Diode/Capacitance(RDC scan)

Auto scanning & auto range:

Resistance: 600.0Ω~6.000MΩ

Capacitance: 6.000nF~600.0uF

Push functions

mode,

resistance

(including

continuity),

capacitance or diode measurements are allowed

by fully automatic detection. A single key and

simple switch could select all measurements.

Expensive and bulky mechanical range switches

are not required. A non-contact electric field

detector (EF mode) is built-in for ac voltage

measurement also. Other features including

range control, data hold, max/min hold, VAHz

and back light function are available. For power

saving, an auto power off & re-power on scheme

are built-in. A sleep output is the indication of

entering auto power off mode.

z

Function selection by single key

Range change function

Hold function

MAX/MIN function

VAHZ function

Back light function

z

Support non-contact voltage detection

High voltage (> 30V) indication of LCD

display for voltage measurement

Built-in HCF(high crest factor detection)

function in AC mode

z

OL level selection (600V/1000V/1500V)

Band-gap reference voltage output

Auto power off (3min. or 10min.) & re-

power on

z

Sleep output indication

On-chip buzzer driver

Low battery detection

Application

z

Smart digital multi-meter

Smart clamp meter

z

Ver 2.7

1

07/10/03

ES51928

6000 Counts Smart DMM

Pin Assignment

50

45

40

35

30

NC

SEG11

SEG10

NC

80

SEG09

SEG08

SEG07

SEG06

SEG05

SEG04

SEG03

SEG02

SEG01

OSC2

OSC1

BKSEL

CESEL

C+

ACEN

BUZOUT

APOSEL

BUZIN

SLEEP

R1K

Cyrustek.

com.tw

85

R9K-

CA+

CA-

NC

90

VR1

VA-

ES51928

VA+

ADP

SGND

VR

C-

95

V-

VRH

NC

V+

OHMC1

OHMC2

DGND

AGND

100

Pin Description

Pin No

Symbol

AGND

LBAT

Type

Description

1

2

P

I

Analog ground.

Low battery configuration. If 3V battery is used, connect it to DGND.

The default low-battery threshold voltage is –2.3V. If 9V battery is

used, the low battery enunciator is displayed when the voltage of

this pin is less than VRH (-1.2V)

3

4

5

6

7

8

CREF+

CREF-

CINT

CAZ

BUFF

RAZ

I/O Positive connection for reference capacitor.

I/O Negative connection for reference capacitor.

O

I

O

Integrator output. Connect to integral capacitor

Auto-zero capacitor connection.

Buffer output pin. Connect to integral resistor

Buffer output pin in high-speed mode. Connect to high-speed integral

resistor.

9

IVSH

I

High current measurement input.

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

10

11

12

13

14

15

16

17

18

19

20

IVSL

OVX

OVH

OVSG

OR1

I

Low current measurement input

Input high voltage for resistance/capacitor measurement

Output connection for resistance/capacitor measurement

Sense low voltage for resistance measurement

Reference resistor connection for 600.0Ω range

Voltage measurement ÷10000 attenuated (1000V)

Voltage measurement ÷1000 attenuated (600.0V)

Voltage measurement ÷100 attenuated (60.00V)

Voltage measurement ÷10 attenuated (6.000V)

I

O

VR5

VR4

VR3

VR2

TEST5

ACVL

I/O Test pin

I

DC signal low input in ACV/ACA mode. Connect to negative output of

external AC to DC converter.

21

ACVH

I

DC signal high input in ACV/ACA mode. Connect to positive output of

external AC to DC converter.

22

23

24

25

26

27

28

29

30

31

32

33

ADI

ADO

I

O

-

Negative input of internal AC to DC OP Amp.

Output of internal AC to DC OP Amp.

OHMC4

OHMC3

OHMC2

OHMC1

NC

Filter capacitor connection for resistance mode

VRH

O

I

Output of band-gap voltage reference. Typically –1.2V

Reference input voltage connection. Typically –400mV

Signal Ground.

VR

SGND

ADP

I

Measurement input in ADP mode

VA+

I

For ADP mode. De-integrating voltage positive input. The input should

be higher than VA-.

34

VA-

I

For ADP mode. De-integrating voltage negative input. The input should

be lower than VA+.

35

36

VR1

NC

I

-

Measurement input.

37

CA-

I/O Negative auto-zero capacitor connection for capacitor measurement

I/O Positive auto-zero capacitor connection for capacitor measurement

38

CA+

39

R9K

O

I

Connect to a precise 9KΩ resister for capacitor measurement.

Connect to a precise 1KΩ resister for capacitor measurement.

Sleep mode indicator, asserts low in SLEEP mode. Normal V+ output.

Pull to V- to enable the BUZOUT.

40

R1K

41

SLEEP

BUZIN

APOSEL

BUZOUT

ACEN

NC

42

43

I

Auto power off idle time selection.

Outputs a 2KHz audio frequency signal for driving piezoelectric buzzer

Output to V- when AC mode inactive and output to V+ in AC mode.

44

O

-

45

46 – 50

51

BKOUT

O

If BKLIT function is enabled, this pin will change from –3V to +3V

for 60 sec, once press BKLIT pin again within 60 sec, this pin will change

back to –3V.

52

ANNUNC

O

Square wave output at the backplane frequency, synchronized to BP1.

ANNUNC can be used to control display annunciator. Connect a LCD

segment to ANNUNC to turn it on; connect an LCD segment to its back

plane to turn it off.

53

54

55

56

57

58

59

60

BP4

BP3

O

I

LCD backplane 4

LCD backplane 3

BP2

LCD backplane 2

BP1

LCD backplane 1

EFEN

BKLIT

MAX/MIN

RANGE

Pull-low to enable non-contact AC voltage detection

Back light function. Pulse low to set BKOUT pin output.

Pulse to V- to enable MAX/MIN function.

Pulse to V- to enable manual mode and manual range selection.

I

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

61

62

VAHz

SEL

I

Pulse to V- to enable VAHz mode.

Pulse to V- to select target measurement

63

HOLD

I

Pulse to V- to enable HOLD function.

64

FC1

I

Switch 1 for function selection.

65

FC2

I

Switch 2 for function selection.

66

FC3

I

Switch 3 for function selection.

67

FUA

I

Switch 1 for current measurement selection.

Switch 2 for current measurement selection.

Pull to high to sense current measurement priority in auto scan mode

Pull to high to sense voltage measurement priority in auto scan mode

Switch for clamp meter application function

LCD segment line 10 – 15

68

FA

I

69

AON

I

70

VON

I

71

CLAMP

SEG15 – 10

NC

I

72 – 77

78 – 79

80 – 88

89

O

-

SEG09 - 01

OSC2

OSC1

O

I

LCD segment line 01 – 09

Crystal oscillator input connection

90

O

Crystal oscillator output connection

When pulled to V-, an auto back light configuration is allowed.

Configure a low level applied to BKLIT larger than 1 second, the

BKOUT will be active.

91

BKSEL

I

If BKLIT is back to high level, the BKOUT would be inactive.

OL selection feature control pin.

92

93

94

95

96

97

98

99

100

CESEL

C+

I

O

P

Positive capacitor connection for on-chip DC-DC converter.

Negative capacitor connection for on-chip DC-DC converter.

Negative supply voltage. Connecting to battery negative terminal.

C-

V-

P

V+

P/O Output of on-chip DC-DC converter.

V+

DGND

AGND

G

Digital ground.

Analog ground.

Absolute Maximum Ratings

Characteristic

Supply Voltage (V- to AGND)

Analog Input Voltage

V+

Rating

-4V

V- -0.6 to V+ +0.6

V+ ≥ (AGND/DGND+0.5V)

AGND/DGND ≥ (V- -0.5V)

V- -0.6 to DGND +0.6

500mW

AGND/DGND

Digital Input

Power Dissipation. Flat Package

Operating Temperature

0℃ to 70℃

-25℃ to 125℃

Storage Temperature

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

Electrical Characteristics

TA=25℃, V- = -3V

Parameter

Symbol

V-

Test Condition

Min.

-3.5

—

Typ.

-3.0

2.5

Max

-2.5

—

Units

Power supply

V

Operating supply current

I_DDNormal operation

I_SSIn sleep mode

mA

µA

In Scan AC/DC mode

0.6

2.5

—

Voltage roll-over error

Voltage nonlinearity

REV 10MΩ input resistor

±0.1 %F.S¹

—

Best case straight

—

NLV

line

±0.1

%F.S

Input Leakage

-10

-2.4

-000

1

10

PA

V

Low battery flag voltage

Zero input reading

Peak to peak backplane

drive voltage

V- to AGND

-2.3

000

-2.2

10MΩ input resistor

+000 counts

-3.5V≤ V ≤-2.2V

3.0

3.15

1

3.3

V

Counter time base period

f_OSC= 4MHZ

—

sec

Reference voltage and open circuit

100KΩ resistor

V_REFbetween VRH and

AGND

voltage for 600Ω measurement

-1.33

-0.86

-1.23

-0.78

-1.13

-0.70

V

Open circuit voltage for Ω

measurement (except 600Ω)

Ω and Continuity

Mode

Between V- pin and

HOLD, RANGE,

SEL,FC1-3,FUA,

FA, VON, AON,

CLAMP, BKLIT,

MAXMIN

Internal pull-high to 0V

current

—

1.2

µA

AC frequency response at 6.000V

Range

±1%

40-400

400-2000

—

10

—

HZ

±5%

AC input response for scan mode

50000

Hz

AC/DC voltage scan mode

VR1(10MΩ input

impedance)

ADP, IVSL and IVSH

300

400

10

500

mV

sensitivity@1kHz

AC/DC current scan mode

sensitivity@1kHz

8

12

mV

pF

Parasitic capacitance

allowed in 6.000MΩ

range

—

RDC scan mode RES sensitivity

200

RDC scan mode DIODE sensitivity

RDC scan mode CAP sensitivity

Forward voltage

0.8

—

V

pF

—

400

Reference voltage temperature

100KΩ resister

coefficient

Between VRH

TC_RF

—

ppm/℃

50

0℃<TA<70℃

—

-1.5

-5

1.5

5

%F.S

counts

%F.S

6nF – 6.0µF

Capacitance measurement

accuracy

-2.0

2.0

60µF ~ 60mF

—

-5

5

counts

Note:

1.Full Scale

Ver 2.7

5

07/10/03

ES51928

6000 Counts Smart DMM

Functional Description

1. Operation Modes

1.1 Voltage Measurement

A re-configurable voltage divider automatically provides a suitable range in

voltage measurement mode. The following table summarizes the full-scale ranges

in each configuration.

Configuration

VR1

Full Scale Range

600.0mV*

6.000V**

60.00V

Divider Ratio

1

Resister Connection

VR1 (10MΩ)

VR2

1/10

VR2 (1.111MΩ)

VR3 (101KΩ)

VR4 (10KΩ)

VR3

1/100

1/1000

1/10000

VR4

600.0V

VR5

1000V***

VR5 (1KΩ)

Note:

* Exists in manual mode only by RANGE key control

**This range is the default range for auto range & auto scan mode

*** Depends on CESEL selection

1.1.1 OL selection

ES51928 has a OL display selection feature archived by configuring a CESEL

pin. If pin CESEL is connected to V-, ES51928 will have a 600.0V overflow

level in DC and AC 600.0V ranges. And the 1000V range will not occur

anymore. If pin CESEL is connected to DGND, the ES51928 will have a 1010V

overflow level in DCV mode and have a 1010V overflow level in ACV mode

also. When CE is floating, a 1500V overflow level in DCV mode but ACV is

still 1010V overflow level. The meter will Show OL when the measuring signal

reaches the overflow level with beeper warning. The configuration of CESEL is

listed below.

CESEL

V-

DGND

Floating

DCV

600.0V

1010V

1500V

ACV

600.0V

1010V

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

1.1.2 HCF detection

ES51928 provides detection of high-crest-factor (HCF) signal in ACV auto range

mode. ES51928 senses the signal and determines it as HCF if the Vpp is large

enough. Once the signal is determined as HCF, ES51928 will jump up one

measuring range regardless of current measurement value. It takes 60ms to jump

one range up. The jumping up process will continue until the maximum range is

reached. With HCF detection, a more accurate result could be obtained. For

example, when a input signal with Vpp=350V, Vrms=70V(CF=5) was applied,

traditional DMM might stay at 60V range but shows counts with the amount of

error up to 10% or even bigger. The error rises from limited input/output swing

at internal ADC. With HCF detection, DMM will stay at 600V range and

exhibits more accurate results.

1.1.3 EF mode

ES51928 supports a non-contact ac voltage measurement, which is called electric

field measurement also. The EF mode is selected by SEL key when EF_EN is

active. The ADC input is configured from ADP pin vs. SGND. When no or less

electric field is detected, the LCD shows “EF”. If the detector senses electric

field, the strength will be showed on LCD by “-“ not digits type. Level 1(weak)

is “-“ and the level 4(strong) is “----“. Additional beeper will be output from

BUZOUT pin. The buzzer frequency depends on the strength of electric field also.

The Faster beeper means the stronger electric field (ac voltage) is sensed.

Ver 2.7

7

07/10/03

ES51928

6000 Counts Smart DMM

1.2 Current Measurement

1.2.1 For multi-meter application

ES51928 has 2 automatic and 1 manual current measurement modes for multi-

meter. The following table summarizes the full-scale range of each mode. When

ES51928 operates in the current measurement modes for multi-meter, it takes

high input from pin IVSH or IVSL, low input from pin SGND and reference

voltage from pin VR.

Mode

Full Scale

Input Terminal

Full scale

300.0mV

Automatic1

600.0µA / 6000µA IVSL/IVSH V.S. SGND

Automatic2 60.00mA / 600.0mA IVSL/IVSH V.S. SGND

Manual

60.00A

IVSH V.S. SGND

1.2.2 For clamp meter application

ES51928 has 2 automatic and 4 manual current measurement modes for Clamp

meter. The following table summarizes the full-scale range of each mode. When

ES51928 operate in the automatic mode1&2, it takes high input from

IVSH/IVSL (higher range/lower range), low input from SGND and reference

voltage from VR. When ES51928 operate in the manual mode1~4, it takes high

input from ADP, low input from SGND and reference voltage from VA+ & VA-.

Mode

Automatic1

Automatic2

Manual1

Manual2

Manual3

Manual4

Full Scale

600.0A / 6000A

60.00A / 600.0A

6.000A

Input Terminal

IVSL/IVSH V.S. SGND

ADP V.S. SGND

Full scale

600.0mV

60.00A

ADP V.S. SGND

600.0A

6000A

ADP V.S. SGND

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

1.3 Resistance Measurement

A re-configurable divider automatically provides a suitable full-scale range in

resistance measurement mode. The following table summarizes the full-scale

ranges and the reference resistors in each configuration.

Configuration

OR1

Full Scale Range

600.0Ω*

Relative Resistor

OR1

Equivalent value

100Ω

OR2

6.000KΩ

VR5

1KΩ

OR3

OR4

OR5

OR6

60.00KΩ

VR4

10KΩ

600.0KΩ

100KΩ

VR3‖VR1

6.000MΩ

1MΩ

VR2‖VR1

60.00MΩ**

VR1

10MΩ

Note: * When auto scan mode is set, continuity check is implemented in this range

** When auto scan mode is set, the 60.00MΩ range is omitted

1.3.1 Continuity check

Continuity check shares the same configuration with 600.0Ω manual resistance

measurement mode and has buzzer output to indicate continuity. The buzzer

generates 2KHz beep whenever the reading is less than 30Ω.

1.4 Diode Measurement

Diode measurement mode shares the same configuration with 6.000V manual

voltage measurement mode and has buzzer output to indicate continuity. The

buzzer generates a 2KHz sound whenever the reading is less than 30mV. If the

test circuit is open or the voltage drop between the two ports of the device (diode)

under test is larger than 2V, the LCD panel will show “OL”.

Ver 2.7

9

07/10/03

ES51928

6000 Counts Smart DMM

1.5 Capacitance Measurement

The following table summarizes the eight ranges of capacitance measurement

mode:

Configuration Full Scale Range

Relative Resistor

20kΩVR+100kΩ

101kΩ

C1

C2

C3

C4

C5

C6

C7

C8

6.000nF

60.00nF

600.0nF

10kΩ

6.000uF

60.00uF

600.0uF

6.000mF*

60.00mF**

R9K / R1K

Note: ^{* & **}The C7-C8 both range is not available for auto scan mode

In order to obtain an accurate reading, a capacitor must be discharged before

measurement begins. The chip has a built-in discharge mode to automatically

discharge the capacitor. In discharge mode, the LCD displays “dIS.C”

Discharging through the chip is quite slow. We recommend users to discharge the

capacitor with some other apparatus.

1.6 Auto power off mode (APO)

1.6.1 Idle Time selection

ES51928 has a default auto power off function. If the meter is idle for more than

the given Idle Time, the chip automatically turns the power off. The idle time to

trigger the auto power off function is determined by pin ‘APOSEL’. If pin

APOSEL is connected to V-, the Idle Time will be set to 3 minutes. If pin

APOSEL is connected to DGND or floating, the Idle Time will be set to 10

minutes. When APO happens, the state of the meter is saved. If the APO is

necessary to be cancelled, power on the ES51928 when any of the push key,

except for HOLD, is pressed down simultaneously.

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

1.6.2 Sleep output

The meter enters sleep mode after auto power-off or push SEL key to last for 2s.

The SLEEP pin asserts low (-3V) in the sleep mode, and asserts high (+3V, not 0V)

after re-power on.

1.6.3 Re-power on

After auto power-off is active, pushing any of the push function or changing the

measurement function can turn on the meter again. If the meter is re-powered on

by changing measurement function, the saved state is cleared. If the meter is re-

powered on by push functions, the chip restores the saved state and enters HOLD

mode. The LCD displays the saved value except for the auto scan mode.

Ver 2.7

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ES51928

6000 Counts Smart DMM

2. Functional Modes Table

Measurement mode depends on the logic level of FC1, FC2, FC3, FUA, FA,

VON, AON and CLAMP.

FC1 FC2 FC3 FUA FA VON AON CLAMP

Functional Mode(pushing SEL key)

_AUTOÆV_ACÆV_DCÆEF*ÆV_AUTOÆ…

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(uA)

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(mA)

Input

VR1,ADP

IVSH/IVSL

IVSH

1

0

1

X

1

0

1

X

1

X

0

X

1

0

1

0

1

X

1

V

I

0

1

I

0

1

I_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(A)

X

1

0

X

0

X

V

_AUTOÆV_ACÆV_DCÆV_AUTOÆ…

I_AC(600.0A/6000A)

VR1

0

IVSH/IVSL

VR1

0

I_AC(60.00A/600.0A)

X

0

RDC_AUTOÆRÆDÆCÆRDC_AUTOÆ…

0

I

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(6.000A)

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(60.00A)

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(600.0A)

ADP

1

0

ADP

0

ADP

1

0

I

_AUTOÆI_ACÆI_DCÆI_AUTOÆ…(6000A)

ADP

Note: * EF mode could be selected when EF_EN is active.

3. Push Function

All the enabled push functions will be reset when the measurement mode is

changed by external switch. Change measurement mode by SEL function will

reset enabled RANGE, HOLD, MAX/MIN, and VAHz functions. The following

table lists the available function versus every measurement mode.

SEL

O

RANGE

HOLD MAX/MIN

VAHz

O

BKLIT

O

V_SCAN

V_AC

X

O

X

O

X

O

X

O

X

O

X

O

X

O

V_DC

O

EF

O

X

O

I_SCAN

O

X

O

I_AC

O

O*

X

O

I_DC

O

RDC_SCAN

Resistance

Continuity

Diode

Capacitance

O

X

O

X

O

X

O

X

O

X

O

Note: For ADP input, RANGE is not available

Ver 2.7

12

07/10/03

ES51928

6000 Counts Smart DMM

3.1 Select function

When power on or SEL key is pressed longer than one second, ES51928 will be

power-on reset to auto scan mode, which scanning mode is determined by [FC1-

FC3] function set. In auto scan mode, the ES51928 automatically selects the

appropriate measurement mode and range. Pushing the SEL key less than one

second could select the target measurement function. Pushing the key larger than

two seconds, the ES51928 will enter power down mode. If power down mode is

entered, only press SEL key to last for one second or apply the power to V-

terminal could re-power on the ES51928. The following figure shows the state

transition.

Push SEL key < 1s

V/A

ac/dc auto scan

AC mode

measurement

DC mode

measurement

EF* mode

measurement

Push SEL key > 1s

Power on reset

Push SEL key > 2s Æ enter power down mode

R/D/C

auto scan

Resistance

measurement

Continuity

measurement

Diode

measurement

Capacitance

measurement

Push SEL key < 1s

Note: * Available when EF_EN is active only

Ver 2.7

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07/10/03

ES51928

6000 Counts Smart DMM

3.2 Range function

RANGE pin switches to and from automatic and manual mode, and while in

manual mode, changes the full-scale range. The following figure shows the state

transition.

1 push < 1 sec

Automatic

Mode

Manual

Mode

1 push > 1 sec

Range up

1 push < 1 sec

3.3 Hold and delay-hold function

The data hold mode makes the meter stop updating the LCD panel. This mode

can be nested in most of the special modes. In auto scanning mode, the HOLD

key is not available. Enabling hold function in automatic mode makes the meter

switch to manual mode. Hold function can be cancelled by changing the

measurement mode, pressing RANGE, or push HOLD again.

The delay-hold function is enabled when HOLD key is pressed larger than 2

seconds. When delay-hold function is entered successfully, the meter will stop to

update the LCD data after six seconds delayed. During the six seconds waiting,

the HOLD symbol on LCD panel will be blinking.

Push > 2s

6sec past

Push < 2s

Normal mode

(Auto/Manual)

HOLD mode

(Manual)

Delay State

(Auto/Manual)

Push > 2s

Push < 2s

Ver 2.7

14

07/10/03

ES51928

6000 Counts Smart DMM

3.4 Max/Min + Hold function

The meter displays the maximum or minimum value of the input in Max/Min

mode. When MAX/MIN is pressed for the first time, the meter displays the

maximum value. The meter displays the minimum value, when it is pressed again.

When MAX/MIN is pressed for the third time, the meter displays current value.

The meter returns to normal operation if MAX/MIN is pressed and held for longer

than one second. Pressing HOLD key in Max/Min mode makes the meter stop

updating the maximum or the minimum value.

1 push<1s

Original state

(Automatic/manual)

1 push>1 sec

1 push>1s

1 push>1 sec

1push<1s

“MIN” active

min value

“Max” “MIN” blink

current value

“MAX” active

max value

1push<1s

Push HOLD

“MAX”“MIN” “H” blink

hold current value.

“MIN” “H” active

hold min value.

“MAX” “H” active

hold max value.

1push<1s

3.5 VAHz function

When voltage or current measurement mode is selected, the VAHz funtion is

available. Push VAHz key to select this frequency measurement mode. The

frequency is measured by auto ranging. The maximum frequency range is

100kHz. The sensitivity of signal input is 10% full scale of voltage or current

mode typically.

Configuration

Range

FR1

FR2

FR3

6.000KHz

60.00KHz

100.0KHz

Ver 2.7

15

07/10/03

ES51928

6000 Counts Smart DMM

3.6 Back light function

When BKSEL is set to DGND or floating, push the BKLIT key to enable the back

light output driving ON/OFF. If the auto back light configuration is active, the

BKLIT becomes a control input for external light sensed circuit. Set to low for one

second to active the back light output driving. Set to high then the driving output is

inactive immediately.

BKSEL

DGND or floating

V-

Configuration

Normal back light function

Auto back light function

4. Miscellaneous

The conditions, which the meter turns on the buzzer, include:

(1) Changing measurement mode generates one beep.

(2) Pressing any of the push functions generates one beep, if the function is valid.

(3) Power on and re-power on generate one beep.

(4) Input overflow in voltage and current mode generates one beep every 0.3

seconds (or 3.33 beeps per second.)

(5) Continuity (diode) check generates a continuous 2KHz beep whenever the

measurement is less then 30Ω(30mV)

(6) Auto power off or power down by SEL key generates a 2KHz beeper that lasts

for 1.5 seconds.

The following figures show the output waveform from the BUZOUT pin.

0.5 mS

(a) Continuous 2KHz beep

0.15 sec

0.3 sec

(b) 3.33 beep/sec

Ver 2.7

16

07/10/03

ES51928

6000 Counts Smart DMM

4.1 LCD configuration

S14 S12

S1

S2 S3 S4 S5 S6

S7 S8 S9 S10 S11

S15

S13

APO

MANU

MAX MIN

SCAN AUTO

HOLD

BP1

BP2

µ m

₂V A

2

AC

₁F

µ m

n

BP3

BP4

1

DC

BATT

M K Ω Hz

SEG01 SEG02 SEG03 SEG04 SEG05 SEG06 SEG07 SEG08 SEG09

BP1 SCAN AUTO

A4 MANU A3

HOLD

B3

APO

A2

G2

BP2

BP3

AC

DC

F4

E4

D4

B4

G4

C4

F3

E3

D3

F2

E2

DP2

B2

C2

DP1

-

G3

C3

BP4 BATT DP3

D2

SEG10 SEG11 SEG12 SEG13 SEG14 SEG15

BP1

BP2

BP3

BP4

A1

F1

E1

D1

µ₂

m₂

V

M

K

Ω

n

µ₁

m₁

F

MAX

MIN

B1

G1

C1

A

Hz

Ver 2.7

17

07/10/03

ES51928

6000 Counts Smart DMM

LCD Backplane Waveform

V- +3.2

V-

V- +3.2

V-

V- +3.2

V-

V- +3.2

V-

V- +3.2

V-

4.2 LCD display on condition

LCD annunciates

Condition

V

A

Ω

F

In voltage measurement mode, and diode measurement mode.

In current measurement mode.

In resistance measurement mode, and continuity mode.

In capacitance measurement mode.

In continuity check mode.

In diode mode.

Hz

DC

AC

SCAN

AUTO

MANU

In VAHZ frequency mode.

In DC voltage or DC current mode.

In AC voltage or AC current mode.

When auto scan mode is selected

When automatic full scale range selection is enabled.

In manual mode.

When the reading is exceeding 30V in DCV or ACV, the DNAGER symbol will be

displayed on

When HOLD function is enabled. When delay-hold is selected, the HOLD symbol

will be blinking for 6 seconds.

HOLD

Max / Min

m₁

When Max or Min function is enabled.

In capacitor measurement mode and the full scale range is in the order of mF.

In capacitor measurement mode and the full scale range is in the order of uF.

µ₁

n

In capacitor measurement mode and the full scale range is in the order of nF.

In voltage or current measurement mode and the full scale range is in the order of 10^-3.

In current measurement mode and the full scale range id in the order of uA.

In resistance measurement mode and the full scale range is in the order of MΩ

In resistance measurement mode and the full scale range is in the order of KΩ

When auto power off function is enabled.

m₂

µ₂

M

K

APO

Ver 2.7

18

07/10/03

ES51928

6000 Counts Smart DMM

Test Circuit

1. Voltage test

4. Current test

AGND

OVSG

AGND

100

1K

OR1

VR5

VR4

VR3

VR2

SGND

0.005

0.495

60A

10K

101

K

1.111M

mA

ADO

4.5

D2

mA

uA

1.0u

D1

ADI

100K

50

A

15K

ACVL

ACVH

TEST5

mA

uA

IVSH

IVSL

15K

1.0u

450

10K

V

R

1

V

R

+4.7u

10K

5. Diode test

10M

-400mV

AGND

OVH

100

Voltage input

Z1

6V

PTC

1.5K

Z2

2. Resistance test

VR1

OVX

OHMC4

OHMC3

OHMC2

OHMC1

10M

22n

220n

VR2

1.111M

470n

47n

PTC

1.5K

OVSG

OVH

OVSG

100

6. Low battery

Z1

6V

Z2

100

OR1

VR5

VR4

VR3

VR2

1K

9V

10K

101K

1.111M

680K

BA

TT

LBAT9

SGND

AGND

0.1u

AGND

V-

270K

0V

3. Current test for clampmeter

7. EF test

100k

ADP

EFin+

EFin-

120M

VR

R

100K

SGND

AGND

ADP

R_L

SGND

AGND

VA+

VA-

400mV

Ver 2.7

19

07/10/03

ES51928

6000 Counts Smart DMM

Application Circuit

a.) AC average rectified circuit

1

2

3

4

5

6

V-

BT1

ZR3

3V

5.6V

uA

SW2

SW1

D

C

B

A

D

C

B

A

SW SPDT

LCD Panel

C3

C4

10uF

ZR1

R1

ZR2

mA

0.1uF

450

J1

uA

SW3

ZR4

SEG01

SEG02

SEG03

SEG04

SEG05

SEG06

SEG07

SEG08

SEG09

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

BP1

C1

1

10uF

2

7.5V

3

C2

R2

4

0.1uF

5

45

6

mA

60A

7

SW4

8

9

U1

10

11

12

13

14

15

16

17

18

19

R3

ZR5

ZR6

4.5

1

2

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

SEG12

SEG13

SEG14

SEG15

CLAMP

VON

AGND

SEG12

SEG13

SEG14

SEG15

CLAMP

VON

SW5

C9

LBAT

220nF

LBAT

CREF+

CREF-

CINT

CAZ

C7

C8

3

0.1uF

4

BP2

R4

5

BP3

6

BP4

0.495

R7

R8

R9

470K

7

AON

60A

BUFF

RAZ

AON

CON19

150K

100K

8

FA

SW6

1

IVSH

IVSL

9

FUA

IVSH

IVSL

OVX

FUA

R10

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

FC3

J2

J4

FC3

R6

100K

FC2

R5

R11

100

FC1

OVH

FC1

ES51928

C6

HOLD

SEL

OVSG

OR1

HOLD

SEL

VR1

20K

R12

R13

R14

R15

R18

100

Function Switch

0.005

Gnd

220pF

1K

VAHZ

RANGE

MZX/MIN

BKLIT

EFEN

BP1

VR5

VAHz

RANGE

MAX/MIN

BKLIT

EFEN

BP1

R/C/D/Cont

1

10K

VR4

101K

1.11M

TEST5

ACVL

ACVH

ADI

V -

SW7

1.5K PTC

ZR8

VR3

R17

VR2

SW SPST

TEST5

ACVL

ACVH

ADI

SW14

BKLIT

SW8

CLAMP

VON

AON

FA

ZR7

BP2

SW_non lock

SW_lock

SW15

BP3

1

ADO

BP4

MZX/MIN SW9

ADO

BP4

IN

ANNUNC

J3

OHMC4

OHMC3

ANNUNC

BKOUT

SW_lock

SW16

VR1_10M

RANGE

VAHZ

SEL

SW10

SW11

SW12

SW13

C11

22nF

C13

SW_lock

SW17

220nF

SW_lock

SW18

Average Circuit

C14

C15

470nF

47nF

FUA

FC3

SW_lock

SW19

HOLD

VR2

10K

R16

10K

TEST5

ADI

SW_lock

SW20

C10

4.7uF

APOSEL

BUZIN

SLEEP

FC2

C12

1uF

SW_lock

SW21

FC1

R21

15K

R22

15K

+ C17

1uF

R23

27K VR3

10K

1

C18

1uF

SW_lock

SW22

VR

+

R26

9K

EFEN

ADP

SW_lock

V -

D1

D2

IN4148

ACVH

ADO

ZR9

5.6V

J5

1N4148

R25

1K

BZ1

ACVL

Buzzer

Title

ES51928 6000 Counts Smart DMM

Size

B

Revision

^NuA^mbp^erplication Circuit ( Average )

Date:

File:

8-Aug-2007

Sheet of

Drawn By:

D:\Protel file\ES51928 Serial.ddb

1

2

3

4

5

6

Notes:

1. The ESD protection circuits protect most of pins. However pins, V+, V-, AGND, DGND and VR1

are not protected enough because the parasitic effect must be decrease. Therefore enough external

protection is needed for assembling, carrying and keeping. In addition, components connecting to

these unprotected pins have to be soldered on board before the IC is soldered.

2. All the zener diodes above are used for IC protection. These protections are needed and these zener

diodes must be soldered on PCB first before soldering ES51928 on.

3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (6/60nF

range). For higher voltage protection, additional configuration of PTC protection is necessary.

Ver 2.7

20

07/10/03

ES51928

6000 Counts Smart DMM

b.) AC RMS circuit

1

2

3

4

5

6

V-

BT1

ZR3

3V

5.6V

uA

SW2

SW1

LCD Panel

SW SPDT

C3

C4

10uF

J1

ZR1

R1

ZR2

mA

SEG01

1

SEG02

SEG03

SEG04

SEG05

SEG06

SEG07

SEG08

SEG09

SEG10

SEG11

SEG12

SEG13

SEG14

SEG15

BP1

0.1uF

450

D

C

B

A

2

D

C

B

A

3

uA

SW3

ZR4

4

C1

5

10uF

7.5V

6

C2

7

R2

0.1uF

8

45

9

10

11

12

13

14

15

16

17

18

19

mA

60A

SW4

U1

R3

ZR5

ZR6

4.5

BP2

1

2

75

74

73

72

71

70

69

68

67

66

65

64

63

62

61

60

59

58

57

56

55

54

53

52

51

SEG12

SEG13

SEG14

SEG15

CLAMP

VON

AGND

SEG12

SEG13

SEG14

SEG15

CLAMP

VON

SW8

BP3

C9

LBAT

220nF

LBAT

CREF+

CREF-

CINT

CAZ

BP4

C7

C8

3

0.1uF

4

CON19

R4

5

6

0.495

R8

R9

470K

7

AON

60A

Gnd

BUFF

RAZ

AON

150K

100K

8

FA

Function Switch

SW9

1

IVSH

IVSL

R10

R11

9

FUA

IVSH

IVSL

OVX

FUA

10

11

12

13

14

15

16

17

18

19

20

21

22

23

24

25

FC3

J2

J3

FC3

R6

100K

FC2

R5

R12

100

FC1

V -

OVH

FC1

ES51928

C6

HOLD

SEL

OVSG

OR1

HOLD

SEL

VR1

20K

R13

R14

R15

R16

R17

100

0.005

220pF

1K

VAHZ

RANGE

MZX/MIN

BKLIT

EFEN

BP1

BKLIT

SW5

VR5

VAHz

RANGE

MAX/MIN

BKLIT

EFEN

BP1

R/C/D/Cont

10K

101K

1.11M

VR4

SW_non lock

SW10

1.5K PTC

ZR8

VR3

R7

MZX/MIN SW6

VR2

SW SPST

TEST5

ACVL

ACVH

ADI

SW_non lock

ACVL

ACVH

ZR7

BP2

RANGE

VAHZ

SEL

SW7

BP2

BP3

ADO

BP4

ADO

BP4

ANNUNC

SW11

SW12

SW13

OHMC4

OHMC3

ANNUNC

BKOUT

1

IN

SW17

ACV / RMS

J4

C10

22nF

C12

SW_lock

220nF

HOLD

C13

C14

470nF

47nF

VR1_10M

V -

ES7PWR

APOSEL

BUZIN

SLEEP

SW14

CLAMP

C11

1uF

TRMS Circuit

SW_lock

SW15

VON

AON

FA

R20

27K VR2

10K

1

R19

5K

VR

R23

9K

SW_lock

SW16

-VS_ES7 +VS_ES7

-VS_ES7

+VS_ES7

ADP

V -

SW_lock

SW18

1

2

3

4

8

7

6

5

2

ZR9

5.6V

RL

COM

+ VS

-

6

ACVH

J5

SW_lock

SW19

Vin

ES7PWR

3

R27

U3

PwrDown Vout

+

FUA

FC3

1K

BZ1

TL061

- VS

U2

C19

Cav

ES7

2.2uF

Buzzer

SW_lock

SW20

-VS_ES7

-VS_ES7 +VS_ES7

R18

47K

+ C20

2.2uF

R24

10K

R25 1.5K

SW_lock

SW21

C16

C17

+

FC2

VR4

100K

+

SW_lock

SW22

C18

1uF ADO

10uF

Title

FC1

VR3

50K

ES51928 6000 Counts Smart DMM

SW_lock

SW23

Size

B

Number

Revision

EFEN

Application Circuit ( TRMS )