ES51925 [CYRUSTEK]
3000 Counts Smart DMM; 3000计数智能数字万用表型号: | ES51925 |
厂家: | Cyrustek corporation |
描述: | 3000 Counts Smart DMM |
文件: | 总22页 (文件大小:340K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
ES51925
3000 Counts Smart DMM
Features
General description
z
z
z
z
3000 counts LCD display
3V DC power supply
ES51925 is an integrated ADC with 3000 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: 4 times/s (voltage mode)
Full automatic measurement:
*Voltage/Current: AC/DC auto scanning
& auto range: 3.000V~1000V
*Resistance/Diode/Capacitance(RDC scan)
Auto scanning & auto range:
Resistance: 300.0Ω~3.000MΩ
Capacitance: 3.000nF~300.0uF
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, 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
VAHZ function
Back light function
z
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
z
z
z
OL level selection (600V/1000V/1500V)
Band-gap reference voltage output
Auto power off (3min. or 10min.) & re-
power on
z
z
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
ES51925
3000 Counts Smart DMM
Pin Assignment
50
45
40
35
30
NC
SEG11
SEG10
NC
NC
NC
NC
NC
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-
ES51925
VA+
ADP
SGND
VR
C-
95
V-
V-
VRH
NC
V+
V+
OHMC1
OHMC2
DGND
AGND
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
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
2
07/10/03
ES51925
3000 Counts Smart DMM
10
11
12
13
14
15
16
17
18
19
20
IVSL
OVX
OVH
OVSG
OR1
I
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 300.0Ω range
Voltage measurement ÷10000 attenuated (1000V)
Voltage measurement ÷1000 attenuated (300.0V)
Voltage measurement ÷100 attenuated (30.00V)
Voltage measurement ÷10 attenuated (3.000V)
I
I
O
O
O
O
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
O
O
O
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
Filter capacitor connection for resistance mode
Filter capacitor connection for resistance mode
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
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
O
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
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
O
O
O
I
LCD backplane 4
LCD backplane 3
BP2
LCD backplane 2
BP1
LCD backplane 1
EFEN
BKLIT
NC
Pull-low to enable non-contact AC voltage detection
Back light function. Pulse low to set BKOUT pin output.
I
-
RANGE
I
Pulse to V- to enable manual mode and manual range selection.
Ver 2.7
3
07/10/03
ES51925
3000 Counts Smart DMM
61
62
VAHz
SEL
I
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
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.
Negative supply voltage. Connecting to battery negative terminal.
C-
V-
V-
P
V+
P/O Output of on-chip DC-DC converter.
P/O Output of on-chip DC-DC converter.
V+
DGND
AGND
G
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
4
07/10/03
ES51925
3000 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
IDD Normal operation
ISS In 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
fOSC = 4MHZ
—
—
sec
Reference voltage and open circuit
100KΩ resistor
VREF between VRH and
AGND
voltage for 300Ω measurement
-1.33
-0.86
-1.23
-0.78
-1.13
-0.70
V
V
Open circuit voltage for Ω
measurement (except 300Ω)
Ω and Continuity
Mode
Between V- pin and
HOLD, RANGE,
SEL,FC1-3,FUA,
FA, VON, AON,
CLAMP, BKLIT
Internal pull-high to 0V
current
—
—
1.2
µA
AC frequency response at 6.000V
Range
±1%
±5%
40-400
400-2000
—
—
—
10
—
—
HZ
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 3.000MΩ
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
TCRF
—
—
ppm/℃
50
0℃<TA<70℃
—
—
—
-1.5
-5
1.5
5
%F.S
counts
%F.S
3nF – 3.0µF
Capacitance measurement
accuracy
-2.0
2.0
30µF ~ 30mF
—
-5
5
counts
Note:
1.Full Scale
Ver 2.7
5
07/10/03
ES51925
3000 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
300.0mV*
3.000V**
30.00V
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
300.0V
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
ES51925 has a OL display selection feature archived by configuring a CESEL
pin. If pin CESEL is connected to V-, ES51925 will have a 600.0V overflow
level in DCV and ACV mode. If pin CESEL is connected to DGND, the
ES51925 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
1010V
Ver 2.7
6
07/10/03
ES51925
3000 Counts Smart DMM
1.1.2 HCF detection
ES51925 provides detection of high-crest-factor (HCF) signal in ACV auto range
mode. ES51925 senses the signal and determines it as HCF if the Vpp is large
enough. Once the signal is determined as HCF, ES51925 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=200V, Vrms=40V(CF=5) was applied,
traditional DMM might stay at 30V 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 300V range and
exhibits more accurate results.
1.1.3 EF mode
ES51925 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
ES51925
3000 Counts Smart DMM
1.2 Current Measurement
1.2.1 For multi-meter application
ES51925 has 2 automatic and 1 manual current measurement modes for multi-
meter. The following table summarizes the full-scale range of each mode. When
ES51925 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
150.0mV
150.0mV
150.0mV
Automatic1
300.0µA / 3000µA IVSL/IVSH V.S. SGND
Automatic2 30.00mA / 300.0mA IVSL/IVSH V.S. SGND
Manual
30.00A
IVSH V.S. SGND
1.2.2 For clamp meter application
ES51925 has 2 automatic and 4 manual current measurement modes for Clamp
meter. The following table summarizes the full-scale range of each mode. When
ES51925 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 ES51925 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
300.0A / 3000A
30.00A / 300.0A
3.000A
Input Terminal
IVSL/IVSH V.S. SGND
IVSL/IVSH V.S. SGND
ADP V.S. SGND
Full scale
300.0mV
300.0mV
300.0mV
300.0mV
300.0mV
300.0mV
30.00A
ADP V.S. SGND
300.0A
3000A
ADP V.S. SGND
ADP V.S. SGND
Ver 2.7
8
07/10/03
ES51925
3000 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
300.0Ω*
Relative Resistor
OR1
Equivalent value
100Ω
OR2
3.000KΩ
VR5
1KΩ
OR3
OR4
OR5
OR6
30.00KΩ
VR4
10KΩ
300.0KΩ
100KΩ
VR3‖VR1
3.000MΩ
1MΩ
VR2‖VR1
30.00MΩ**
VR1
10MΩ
Note: * When auto scan mode is set, continuity check is implemented in this range
** When auto scan mode is set, the 30.00MΩ range is omitted
1.3.1 Continuity check
Continuity check shares the same configuration with 300.0Ω 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 3.000V 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
ES51925
3000 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
20kΩVR+100kΩ
101kΩ
C1
C2
C3
C4
C5
C6
C7
C8
3.000nF
30.00nF
300.0nF
10kΩ
3.000uF
30.00uF
300.0uF
3.000mF*
30.00mF**
R9K / R1K
R9K / R1K
R9K / R1K
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
ES51925 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 ES51925 when any of the push key,
except for HOLD, is pressed down simultaneously.
Ver 2.7
10
07/10/03
ES51925
3000 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
11
07/10/03
ES51925
3000 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)
AUTOÆVACÆVDCÆEF*ÆVAUTOÆ…
AUTOÆIACÆIDCÆIAUTOÆ…(uA)
AUTOÆIACÆIDCÆIAUTOÆ…(mA)
Input
VR1,ADP
IVSH/IVSL
IVSH/IVSL
IVSH
1
1
1
1
1
1
1
0
0
0
1
1
X
X
X
X
X
X
X
1
0
0
0
0
0
0
0
0
1
1
1
1
X
1
X
0
X
X
X
X
1
0
1
0
0
0
0
1
1
1
X
1
1
1
1
V
I
0
0
1
I
0
1
1
IAUTOÆIACÆIDCÆIAUTOÆ…(A)
X
1
0
X
X
X
X
X
X
0
0
X
X
X
X
X
X
X
X
X
X
X
X
X
V
AUTOÆVACÆVDCÆVAUTOÆ…
IAC(300.0A/3000A)
VR1
0
IVSH/IVSL
IVSH/IVSL
VR1
0
IAC(30.00A/300.0A)
X
0
RDCAUTOÆRÆDÆCÆRDCAUTOÆ…
0
I
I
I
AUTOÆIACÆIDCÆIAUTOÆ…(3.000A)
AUTOÆIACÆIDCÆIAUTOÆ…(30.00A)
AUTOÆIACÆIDCÆIAUTOÆ…(300.0A)
ADP
1
0
ADP
0
0
ADP
1
0
I
AUTOÆIACÆIDCÆIAUTOÆ…(3000A)
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, and VAHz functions. The following table lists the
available function versus every measurement mode.
SEL
O
RANGE
HOLD
X
VAHz
O
BKLIT
O
VSCAN
VAC
X
O
O
O
O
O
VDC
O
O
O
O
O
EF
O
X
X
X
O
ISCAN
O
X
X
O
O
IAC
O
O*
O*
X
O
O
O
IDC
O
O
O
O
RDCSCAN
Resistance
Continuity
Diode
Capacitance
O
X
X
O
O
O
O
X
O
O
X
O
X
O
O
X
O
X
O
O
O
O
X
O
Note: For ADP input, RANGE is not available
Ver 2.7
12
07/10/03
ES51925
3000 Counts Smart DMM
3.1 Select function
When power on or SEL key is pressed longer than one second, ES51925 will be
power-on reset to auto scan mode, which scanning mode is determined by [FC1-
FC3] function set. In auto scan mode, the ES51925 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 ES51925 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 ES51925. 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
13
07/10/03
ES51925
3000 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
Push < 2s
Normal mode
(Auto/Manual)
HOLD mode
(Manual)
Delay State
(Auto/Manual)
Push > 2s
Push < 2s
Ver 2.7
14
07/10/03
ES51925
3000 Counts Smart DMM
3.4 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
3.000KHz
30.00KHz
100.0KHz
3.5 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
Ver 2.7
15
07/10/03
ES51925
3000 Counts Smart DMM
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
ES51925
3000 Counts Smart DMM
4.1 LCD configuration
S14 S12
S1
S2 S3 S4 S5 S6
S7 S8 S9 S10 S11
S15
S13
APO
MANU
SCAN AUTO
HOLD
BP1
BP2
µ m
2V A
1 F
2
AC
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
B1
G1
C1
A
Hz
Ver 2.7
17
07/10/03
ES51925
3000 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
m1
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
ES51925
3000 Counts Smart DMM
Test Circuit
1. Voltage test
4. Current test
AGND
AGND
1K
VR5
VR4
VR2
SGND
30A
ADO
4.5
D2
uA
100K
100K
50
A
ACVL
ACVH
mA
uA
IVSH
IVSL
15K
450
1
V
R
+4.7u
10K
5. Diode test
AGND
OVH
100
Voltage input
2. Resistance test
VR1
OVX
OHMC4
OHMC3
OHMC2
OHMC1
10M
22n
220n
VR2
470n
47n
OVH
OVSG
100
6. Low battery
Z1
Z2
OR1
VR5
VR4
VR3
VR2
10K
1.111M
BA
TT
SGND
AGND
V-
3. Current test for clampmeter
7. EF test
100k
ADP
EFin+
EFin-
60M
VR
R
100K
SGND
AGND
ADP
RL
SGND
AGND
VA+
VA-
400mV
Ver 2.7
19
07/10/03
ES51925
3000 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
LCD Panel
C3
C4
10uF
ZR1
R1
ZR2
SW SPDT
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
mA
30A
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
220nF
LBAT
CREF+
CREF-
CINT
CAZ
C7
C8
3
0.1uF
4
BP2
R4
5
BP3
6
BP4
0.495
R7
R8
R9
220K
7
AON
30A
BUFF
RAZ
AON
CON19
75K
8
FA
FA
SW6
1
1
IVSH
IVSL
100K
100K
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
FC2
R5
R11
100
FC1
OVH
FC1
C6
HOLD
SEL
OVSG
OR1
HOLD
SEL
ES51925
VR1
20K
R12
R13
R14
R15
R18
100
Function Switch
0.005
Gnd
220pF
1K
VAHZ
RANGE
VR5
VAHz
RANGE
NC
10K
VR4
101K
1.11M
TEST5
ACVL
ACVH
ADI
V -
V -
SW7
SW SPST
1.5K PTC
ZR8
VR3
R17
BKLIT
EFEN
BP1
VR2
BKLIT
EFEN
BP1
TEST5
ACVL
ACVH
ADI
SW13
BKLIT
RANGE
VAHZ
SEL
SW8
CLAMP
VON
AON
FA
VR1_10M
ZR7
BP2
R / C / D / Cont.
BP2
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_non lock
SW_lock
SW14
BP3
BP3
1
ADO
BP4
SW9
ADO
BP4
ANNUNC
J3
OHMC4
OHMC3
ANNUNC
BKOUT
SW_lock
SW15
SW10
SW11
SW12
C11
22nF
C13
SW_lock
SW16
220nF
SW_lock
SW17
Average Circuit
C14
C15
470nF
47nF
HOLD
FUA
FC3
SW_lock
SW18
VR2
10K
R16
10K
TEST5
ADI
SW_lock
SW19
C10
4.7uF
APOSEL
BUZIN
SLEEP
FC2
C12
1uF
SW_lock
SW20
FC1
R21
15K
R22
15K
R23
27K VR3
10K
SW_lock
SW21
VR
R26
9K
EFEN
C17
1uF
D2
SW_lock
V -
D1
ACVH
ADO
C18
ZR9
5.6V
ADP
1N4148
IN4148
220nF
R25
1K
1
J5
BZ1
ACVL
Buzzer
Title
ES51925 3000 Counts Smart DMM
Size
B
Revision
NuAmbperplication Circuit ( Average )
Date:
File:
30-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 ES51925 on.
3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (3/30nF
range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.7
20
07/10/03
ES51925
3000 Counts Smart DMM
b.) AC RMS circuit
1
2
3
4
5
6
V-
BT1
ZR3
3V
5.6V
uA
SW2
SW1
LCD Panel
C3
C4
10uF
J1
ZR1
R1
ZR2
SW SPDT
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
mA
30A
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
220nF
LBAT
CREF+
CREF-
CINT
CAZ
BP4
C7
C8
3
0.1uF
4
CON19
R4
5
6
0.495
R8
R9
220K
7
AON
30A
BUFF
RAZ
AON
75K
8
FA
FA
Function Switch
SW9
1
1
IVSH
IVSL
R10
R11
100K
100K
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
FC2
R5
R12
100
FC1
ES51925
V -
OVH
FC1
C6
HOLD
SEL
OVSG
OR1
HOLD
SEL
VR1
20K
R13
R14
R15
R16
R17
100
0.005
Gnd
220pF
1K
VAHZ
RANGE
BKLIT
RANGE
VAHZ
SEL
SW5
SW6
SW7
SW11
SW12
VR5
VAHz
RANGE
NC
10K
101K
1.11M
VR4
SW_non lock
SW10
1.5K PTC
ZR8
VR3
R7
BKLIT
EFEN
BP1
VR2
BKLIT
EFEN
BP1
SW SPST
VR1_10M
TEST5
ACVL
ACVH
ADI
SW_non lock
SW_non lock
SW_non lock
SW_non lock
ACVL
ACVH
ZR7
BP2
BP2
BP3
BP3
ADO
BP4
R / C / D / Cont.
ADO
BP4
ANNUNC
OHMC4
OHMC3
ANNUNC
BKOUT
1
SW16
ACV / RMS
J4
HOLD
C12
22nF
C14
SW_lock
220nF
TRMS Circuit
C15
C16
470nF
47nF
-VS_ES7
+VS_ES7
VR2
500K
V -
ES7_PWR
R18
10K
APOSEL
BUZIN
SLEEP
SW13
CLAMP
1
2
3
4
8
7
6
5
C13
1uF
RL
COM
+ VS
SW_lock
SW14
Vin
ES7_PWR
ACVH
PwrDown Vout
VON
AON
FA
R21
27K VR3
10K
- VS
U2
C10
Cav
ES7
VR
R24
9K
SW_lock
SW15
-VS_ES7 +VS_ES7
R19
150
R20
47K
2.2uF
1uF
+ C11
2.2uF
V -
SW_lock
SW17
C18
C19
+
C21
ZR9
5.6V
+
ADP
SW_lock
SW18
ADO
220nF
10uF
10uF
R26
1K
C20
1
J5
FUA
FC3
VR4
50K
BZ1
Buzzer
SW_lock
SW19
SW_lock
SW20
FC2
SW_lock
SW21
Title
FC1
ES51925 3000 Counts Smart DMM
SW_lock
SW22
Size
B
Number
Revision
EFEN
Application Circuit ( TRMS )
SW_lock
Date:
File:
30-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 ES51925 on.
3. The OVX pin resistance have to be kept below 120kΩ for the capacitance mode accuracy (3/30nF
range). For higher voltage protection, additional configuration of PTC protection is necessary.
Ver 2.7
21
07/10/03
ES51925
3000 Counts Smart DMM
Package Information
7.1 100 Pin LQFP Package
7.2 Dimension Parameters
Ver 2.7
22
07/10/03
相关型号:
©2020 ICPDF网 联系我们和版权申明