TS3002_技术文档

TS3002

A 1V/1µA Easy-to-Use Silicon Oscillator/Timer

FEATURES

DESCRIPTION



Ultra Low Supply Current: 1µA at 25kHz

The TS3002 is the industry’s first and only single-

supply CMOS oscillator fully specified to operate at

1V while consuming a 1µA supply current at an

output frequency of 25kHz. This oscillator is compact,

easy-to-use, and versatile. Optimized for ultra-long

life, battery-powered applications, the TS3002 is the

first oscillator in the “NanoWatt Analog™” high-

performance analog integrated circuits portfolio. The

TS3002 can operate from single-supply voltages from

0.9V to 1.8V.

Supply Voltage Operation: 0.9V to 1.8V

Programmable Frequency Range:

o 5.2kHz ≤ FOUT ≤ 90kHz (BOOST = GND)

o 5.2kHz ≤ FOUT ≤ 290kHz (BOOST = VDD)

FOUT Period Drift: 0.044%/°C

PWMOUT Duty Cycle Range: 12% to 90%

Single Resistor and Capacitor Set Output

Frequency



Output Driver Resistance: 160Ω

Requiring only a resistor and a capacitor to set the

output frequency, the TS3002 represents a 66%

reduction in pcb area and a factor-of-10 reduction in

power consumption over other CMOS-based

integrated circuit oscillators. When compared against

industry-standard 555-timer-based products, the

TS3002 offers up to 93% reduction in pcb area and

four orders of magnitude lower power consumption.

APPLICATIONS

Portable and Battery-Powered Equipment

Low-Parts-Count Nanopower Oscillator

Compact Nanopower Replacement for Crystal and

Ceramic Oscillators

The TS3002 is fully specified over the -40°C to +85°C

temperature range and is available in a low-profile, 8-

pin 2x2mm TDFN package with an exposed back-

side paddle.

Nanopower Pulse-width Modulation Control

Nanopower Pulse-position Modulation Control

Nanopower Clock Generation

Nanopower Sequential Timing

TYPICAL APPLICATION CIRCUIT

Table 1: FOUT vs R_SET, C_SET= 7.9pF

R_SET(MΩ) FOUT (kHz)

1

106

43

25

16

11

2.49

4.32

6.81

9.76

Table 2: FOUT vs C_SET, R_SET= 4.32MΩ

C_SET(pF) FOUT (kHz)

5

39

25

19

13

10

7.9

10

15

20

Page 1

TS3002

ABSOLUTE MAXIMUM RATINGS

V_DDto GND....................................................................-0.3V to +2V

Continuous Power Dissipation (T_A= +70°C)

V

_CNTRLto GND ...............................................................-0.3V to +2V

8-Pin TDFN (Derate at 23.8mW/°C above +70°C)....... 1951mW

Operating Temperature Range................................. -40°C to +85°C

Storage Temperature Range.................................. -65°C to +150°C

Lead Temperature (Soldering, 10s)...................................... +300°C

RSET to GND................................................................-0.3V to +2V

CSET to GND................................................................-0.3V to +2V

FOUT, PWMOUT to GND.............................................-0.3V to +2V

Short Circuit Duration FOUT, PWMOUT to GND or V_DD

..................................................................................Continuous

Electrical and thermal stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These

are stress ratings only and functional operation of the device at these or any other condition beyond those indicated in the operational sections

of the specifications is not implied. Exposure to any absolute maximum rating conditions for extended periods may affect device reliability and

lifetime.

PACKAGE/ORDERING INFORMATION

PART

MARKING

ORDER NUMBER

TS3002ITD822

TS3002ITD822T

CARRIER QUANTITY

Tape

-----

& Reel

AAH

Tape

3000

& Reel

Lead-free Program: Silicon Labs supplies only lead-free packaging.

Consult Silicon Labs for products specified with wider operating temperature ranges.

Page 2

TS3002 Rev. 1.0

TS3002

ELECTRICAL CHARACTERISTICS

V_DD= 1V, V_CNTRL= V_DD, V_BOOST= 0V, R_SET= 4.32MΩ, C_SET= 7.9pF, R_LOAD(FOUT)= Open Circuit, C_LOAD(FOUT)= 0pF, C_LOAD(PWM)= 0pF unless

otherwise noted. Values are at T_A= 25°C unless otherwise noted. See Note 1.

PARAMETER

Supply Voltage

SYMBOL

CONDITIONS

MIN

0.9

TYP

1

MAX

1.8

1.5

2.8

3.7

5.4

3.2

4.8

5.3

7.3

UNITS

V

V_DD

-40°C ≤ T_A≤ 85°C

2.1

2.16

3.6

V_CNTRL= 0.15 x V_DD

Supply Current

FOUT Period

I_DD

µA

µs

V_BOOST= V_DD

V_BOOST= V_DD,V_CNTRL= 0.15 x V_DD

37

34.7

36

40.6

39.5

44

45.6

43

-40°C ≤ T_A≤ 85°C

t_FOUT

V_BOOST= V_DD

33

48

1.3

FOUT Period Line

Regulation

∆t_FOUT/V

1V ≤ V_DD≤ 1.8V

%/V

V_BOOST= V_DD

-1.6

0.044

0.086

8.9

49.3

90.5

8.5

FOUT Period

Temperature Coefficient

∆t_FOUT/∆T

%/°C

V_BOOST= V_DD

V_CNTRL= 0.03 x V_DD

V_CNTRL= 0.15 x V_DD

V_CNTRL= 0.27 x V_DD

V_CNTRL= 0.03 x V_DD

V_CNTRL= 0.15 x V_DD

V_CNTRL= 0.27 x V_DD

4.5

44

83

4.5

47

86

13

54

97

12.5

54

96

PWMOUT Duty Cycle

DC(PWMOUT)

%

V_BOOST= V_DD

50.4

91.2

FOUT, PWMOUT

Rise Time

FOUT, PWMOUT

Fall Time

t_RISE

t_FALL

See Note 2, C_L= 15pF

8.6

ns

See Note 2, C_L= 15pF

See Note 3

7.9

FOUT Jitter

0.08

%

V

RSET Pin Voltage

V(RSET)

I_CNTRL

0.3

25

45

80

CNTRL Output Current

PWMOUT Enable

nA

-40°C ≤ T_A≤ 85°C

V_{PWM_EN}

(V_DD- V_CNTRL), 0.9V < V_DD< 1.8V

375

mV

PWMOUT Disable

BOOST Enable

BOOST Disable

V_{PWM_DIS}

V_IH

V_IL

(V_DD- V_CNTRL), 0.9V < V_DD< 1.8V

(V_DD– V_BOOST), 0.9V < V_DD< 1.8V

0.9V < V_DD< 1.8V

131

77

mV

BOOST Input Current

I_BOOST

10

nA

High Level Output

Voltage, FOUT and

PWMOUT

Low-level Output

Voltage, FOUT and

PWMOUT

V

_DD- V_OH

I_OH= 1mA

I_OL= 1mA

160

mV

V_OL

140

mV

Note 1: All devices are 100% production tested at T_A= +25°C and are guaranteed by characterization for T_A= T_MINto T_MAX, as specified.

Note 2: Output rise and fall times are measured between the 10% and 90% of the V_DDpower-supply voltage levels. The specification is based

on lab bench characterization and is not tested in production.

Note 3: Timing jitter is the ratio of the peak-to-peak variation of the period to the mean of the period. The specification is based on lab bench

characterization and is not tested in production.

TS3002 Rev. 1.0

Page 3

TS3002

TYPICAL PERFORMANCE CHARACTERISTICS

V_DD= 1V, V_CNTRL= V_DD, V_BOOST= 0V, R_SET= 4.32MΩ, C_SET= 7.9pF, R_LOAD(FOUT)= Open Circuit, C_LOAD(FOUT)= 5pF, unless otherwise noted.

Values are at T_A= 25°C unless otherwise noted.

Supply Current vs FOUT Period

2.5

2

8.5

7.1

5.7

4.3

BOOST = GND

BOOST = V_DD

1.5

1

2.9

1.5

0.5

0

40

80

120

160

200

0

40

80

120

160

200

PERIOD - µs

Supply Current vs C_LOAD(FOUT)

2

3.2

3

BOOST = GND

BOOST = V_DD

1.8

1.6

2.8

2.6

2.4

1.4

1.2

1

2.2

2

0.8

0

10

20

30

40

0

10

20

30

40

C_LOAD- pF

Supply Current vs Temperature

1.5

3.2

BOOST = GND

BOOST = V_DD

1.36

2.88

1.22

1.08

0.94

0.8

2.56

2.24

1.92

1.6

-40

-15

10

35

60

85

-40

-15

10

35

60

85

TEMPERATURE - ºC

Page 4

TS3002 Rev. 1.0

TS3002

TYPICAL PERFORMANCE CHARACTERISTICS

V_DD= 1V, V_CNTRL= V_DD, V_BOOST= 0V, R_SET= 4.32MΩ, C_SET= 7.9pF, R_LOAD(FOUT)= Open Circuit, C_LOAD(FOUT)= 5pF, unless otherwise noted.

Values are at T_A= 25°C unless otherwise noted.

FOUT Period vs Temperature

41.5

41

43

42.5

42

BOOST = GND

BOOST = V_DD

40.5

41.5

40

39.5

39

41

40.5

40

38.5

38

39.5

-40

-15

10

35

60

85

-40

-15

10

35

60

85

TEMPERATURE - ºC

FOUT Period vs Supply Voltage

41.2

41

40

BOOST = GND

BOOST = V_DD

39.8

39.6

39.4

39.2

39

40.8

40.6

40.4

38.8

0.9 1.05 1.2 1.35 1.5 1.65 1.8

SUPPLY VOLTAGE - Volt

0.9 1.05 1.2 1.35 1.5 1.65 1.8

SUPPLY VOLTAGE - Volt

Period vs R_SET

200

160

200

160

BOOST = GND

BOOST = V_DD

120

80

120

80

40

0

4

8

12

16

20

0

4

8

12

16

20

R_SET- Mꢀ

TS3002 Rev. 1.0

Page 5

TS3002

TYPICAL PERFORMANCE CHARACTERISTICS

V_DD= 1V, V_CNTRL= V_DD, V_BOOST= 0V, R_SET= 4.32Mꢀ, C_SET= 7.9pF, R_LOAD(FOUT)= Open Circuit, C_LOAD(FOUT)= 5pF, unless otherwise noted.

Values are at T_A= 25°C unless otherwise noted.

Period vs C_SET

BOOST = GND

Period vs C_SET

100

80

100

80

BOOST = V_DD

60

40

20

40

20

0

4

8

12

16

20

0

4

8

12

C_SET- pF

Supply Current Distribution

16

20

C_SET- pF

Start-up Time vs Supply Voltage

1.8

1.66

1.52

1.38

1.24

1.1

35%

30%

25%

20%

15%

10%

5%

0%

0.9

1.2

1.5

1.8

0.97

0.99

1.01

1.03

SUPPLY VOLTAGE - Volt

SUPPLY CURRENT - µA

Page 6

TS3002 Rev. 1.0

TS3002

FOUT Transient Response

V_DD= 1V, BOOST = V_DD, C_LOAD= 47pF

V_DD= 1.5V, BOOST = V_DD, C_LOAD= 47pF

5µs/DIV

FOUT and PWMOUT Transient Response

V_DD= 1V, V_CNTRL= 0.035 x V_DD, BOOST = V_DD, C_LOAD= 22pF

5µs/DIV

TS3002 Rev. 1.0

Page 7

TS3002

PIN FUNCTIONS

NAME

FUNCTION

Fixed Frequency Output. A push-pull output stage with an output

resistance of 160ꢀ, the FOUT pin swings from GND to V_DD. For

lowest power operation, capacitive loads should be minimized

and resistive loads should be maximized.

1

FOUT

BOOST Input. A digital switch input, BOOST controls the

propagation delay of the primary timing comparator in the

TS3002’s master oscillator subcircuit. Connecting the BOOST pin

to GND sets the maximum programmable oscillator frequency to

~90kHz.Connecting the BOOST pin to VDD reduces the

comparator’s propagation delay and increases the maximum

programmable master oscillator’s frequency to 290kHz.

Pulse-width Modulated Output. A push-pull output stage with an

output resistance of 160ꢀ, the PWMOUT pin is wired anti-phase

2

3

4

BOOST

PWMOUT with respect to FOUT and swings from GND to V_DD. For lowest

power operation, capacitive loads should be minimized and

resistive loads should be maximized.

PWMOUT Enable and Duty Cycle Control Input. An analog input

pin, the V^CNTRLpin voltage enables the TS3002’s PWM engine

and controls the duty cycle at PWMOUT from 12%

(V^CNTRL= 0.03 x VDD) to 90% (VCNTRL = 0.27 x VDD). Enabling the

PWM engine increases the TS3002’s nominal operating supply

current. To disable the TS3002’s PWM engine, CNTRL shall be

connected to V^DD.

CNTRL

FOUT Programming Capacitor Input. A 7.9pF capacitor

connected from this pin to GND in junction with a 4.32Mꢀ resistor

at the RSET pin sets the TS3002’s internal oscillator’s output

period to ~40µs (25kHz). The maximum capacitance value is

22pF.

Ground – Connect this pin to the system’s analog ground plane.

FOUT Programming Resistor Input. A 4.32Mꢀ resistor connected

from this pin to GND sets the TS3002’s internal oscillator’s output

period to 40μs (25kHz). For optimal performance, the

composition of the RSET resistor shall be consistent with

tolerances of 1% or lower. The RSET pin voltage is 0.3V at a 1V

supply.

5

6

CSET

GND

7

RSET

Power Supply Voltage Input. While the TS3002 is fully specified

at 1V, the supply voltage range is 0.9V ≤ V^DD≤ 1.8V. It is always

considered good engineering practice to bypass the V^DDpin with

a 0.1μF ceramic decoupling capacitor in close proximity to the

TS3002.

8

VDD

-----

EP

Exposed paddle is electrically connected to GND.

Page 8

TS3002 Rev. 1.0

TS3002

BLOCK DIAGRAM

where the scalar k is approximately 1.19. With an

R_SET= 4.32Mꢀ and a C_SET= 7.9pF, the output

frequency is approximately 25kHz with a 50% duty

cycle. As design aids, Tables 1 lists TS3002’s typical

FOUT for various standard values for R_SETwith

C_SET= 7.9pF and Table 2 lists typical FOUT for

various standard values for C_SETwith R_SET= 4.32Mꢀ.

THEORY OF OPERATION

The TS3002 is a user-programmable oscillator where

the period of the square wave at its FOUT terminal is

generated by an external resistor and capacitor pair.

The output frequency is given by:

1

1E6

The TS3002 also provides a separate PWM output

Table 2: FOUT vs C_SET, R_SET= 4.32MΩ

C_SET(pF) FOUT (kHz)

FOUT (kHz) =

ꢀꢁ

t_FOUT(µs) k ∙ R_SETMꢀ x C_SET(pF)

ꢂ

ꢃ

Table 1: FOUT vs R_SET, C_SET= 7.9pF

R_SET(MΩ) FOUT (kHz)

1

106

43

25

16

11

5

39

25

19

13

10

2.49

4.32

6.81

9.76

7.9

10

15

20

TS3002 Rev. 1.0

Page 9

TS3002

signal at its PWMOUT terminal that is anti-phase with

respect to FOUT. In addition, applying a voltage at

the CNTRL both enables the TS3002’s internal PWM

engine as well as adjusting the duty cycle from 12%

to 90%. A dc control voltage equal to 0.03 x VDD

applied to the CNTRL pin enables the PWM engine

to set the duty cycle to 12%. A dc control voltage

equal to 0.27 x VDD increases the duty cycle to 90%

and connecting CNTRL to VDD disables the PWM

engine altogether. Configured for nominal operation

(PWM engine OFF, BOOST pin to GND), the supply

current of the TS3002 is 1µA; enabling the PWM

engine increases the TS3002 operating supply

current as shown in the electrical specification table.

The BOOST pin controls the propagation delay of the

TS3002’s internal comparators. When BOOST is

connected to GND, the TS3002’s maximum

programmable operating frequency is ~90kHz.

Connecting the BOOST pin to VDD reduces the

propagation delay of the internal oscillators, thereby

extending the high end maximum operating

frequency to 290kHz.

1

APPLICATIONS INFORMATION

C_EXTꢁ=ꢁ

1

ꢁ1

ꢁ-ꢁ

C_LOAD(EFF)C_PROBE

Minimizing Power Consumption

For example, if the instrument’s input probe

capacitance is 15pF and the desired effective load

capacitance at either or both FOUT and PWMOUT

terminals is to be ≤5pF, then the value of C_EXTshould

be ≤7.5pF.

To keep the TS3002’s power consumption low,

resistive loads at the FOUT and PWMOUT terminals

increase dc power consumption and therefore should

be as large as possible. Capacitive loads at the

FOUT and PWMOUT terminals increase the

TS3002’s transient power consumption and, as well,

should be as small as possible.

TS3002 Start-up Time

As the TS3002 is powered up, its FOUT terminal

(and PWMOUT terminal, if enabled) is active once

the applied VDD is higher than 0.9 volt. Once the

applied VDD is higher than 0.9 volt, the master

oscillator achieves steady-state operation within

1.2ms.

One challenge to minimizing the TS3002’s transient

power consumption is the probe capacitance of

oscilloscopes and frequency counter instruments.

Most instruments exhibit an input capacitance of

15pF or more. Unless buffered, the increase in

transient load current can be as much as 400nA.

Current- and Voltage-Controlled Oscillators

To minimize capacitive loading, the technique shown

in Figure 1 can be used. In this circuit, the principle of

series-connected capacitors can be used to reduce

the effective capacitive load at the TS3002’s FOUT

and PWMOUT terminals.

The TS3002 can be configured into

Current-Controlled Oscillator as shown in Figure 2.

a

Figure 2: Configuring the TS3002 into a

Figure 1: Using an External Capacitor in Series with

Current-Controlled Oscillator.

Probes Reduces Effective Capacitive Load.

With a current source sourcing a current of 223nA to

262nA, FOUT can generate an output signal with a

frequency range of 5.2kHz to 90kHz. In a similar

manner, a Voltage-Controlled Oscillator can be

configured as shown in Figure 3. In this case, a

voltage source sourcing a voltage of 290mV to

To determine the optimal value for C_EXTonce the

probe capacitance is known by simply solving for

C_EXTusing the following expression:

Page 10

TS3002 Rev. 1.0

TS3002

341mV can generate an FOUT output signal

frequency range of 5.2kHz to 90kHz as well. It is

recommended to use resistor values with a 1%

tolerance.

Using Standard Resistors to Increase FOUT

Resolution

The TS3002 can be configured to provide a 0.1%

resolution on the output frequency as shown in

Figure 5. To do so, R1 can be set to approximately

10% of the value selected for R2. In addition, R2 and

R1 should be chosen with a 0.1% and 1% tolerance,

respectively. Since R2 is 90% of the total resistance,

it has the largest impact on the resolution of the

output frequency. With R1 = 91kꢀ and R2 = 910kꢀ,

the output frequency is 90kHz and with R1 = 400kꢀ

and R2 = 4Mꢀ, the output frequency is 23kHz.

Figure 3: Configuring the TS3002 into a Voltage-

Controlled Oscillator.

Using a Potentiometer to Trim the TS3002’s

Output Frequency

By using a fixed resistor and a potentiometer, the

output frequency of the TS3002 can be trimmed as

shown in Figure 4. By selecting a fixed resistor R1

with a tolerance of 0.1% and a potentiometer P1 with

a 5% tolerance, the output frequency can be trimmed

to provide a ±2% trimming range. As shown in Figure

5, R1+P1 and C2 set the output frequency to

25.052kHz when P1 = 0ꢀ and with P1 =200kꢀ, the

resulting output frequency is 24.024kHz.

Figure 5: Setting the TS3002’s Output

Frequency to 0.1% Resolution using

Standard Resistors.

Figure 4: Using a Fixed Resistor and a

Potentiometer to Trim the TS3002’s

Output Frequency.

TS3002 Rev. 1.0

Page 11

TS3002

PACKAGE OUTLINE DRAWING

8-Pin TDFN22 Package Outline Drawing

(N.B., Drawing not to scale; all dimensions in mm; JEDEC MO-229 compliant)

BOTTOM VIEW

SIDE VIEW

Patent Notice

Silicon Labs invests in research and development to help our customers differentiate in the market with innovative low-power, small size,

analog-intensive mixed-signal solutions. Silicon Labs' extensive patent portfolio is a testament to our unique approach and world-class

engineering team.

The information in this document is believed to be accurate in all respects at the time of publication but is subject to change without notice.

Silicon Laboratories assumes no responsibility for errors and omissions, and disclaims responsibility for any consequences resulting from the

use of information included herein. Additionally, Silicon Laboratories assumes no responsibility for the functioning of undescribed features or

parameters. Silicon Laboratories reserves the right to make changes without further notice. Silicon Laboratories makes no warranty,

representation or guarantee regarding the suitability of its products for any particular purpose, nor does Silicon Laboratories assume any

liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation

consequential or incidental damages. Silicon Laboratories products are not designed, intended, or authorized for use in applications intended

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TS3002 Rev. 1.0

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型号：	TS3002
厂家：	SILICON
描述：	Easy-to-Use Silicon Oscillator/Timer
文件：	总13页 (文件大小：1259K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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