TS3003DB [TOUCHSTONE]
A 1.55V to 5.25V, 1.9A, 9kHz to 300kHz Silicon Timer; 一个1.55V至5.25V ， 1.9A ， 9kHz到300kHz的硅定时器
| 型号： | TS3003DB |
| 厂家： | 
TOUCHSTONE SEMICONDUCTOR INC |
| 描述： | A 1.55V to 5.25V, 1.9A, 9kHz to 300kHz Silicon Timer |
| 文件： | 总4页 (文件大小：332K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS3003 Demo Board
A 1.55V to 5.25V, 1.9µA, 9kHz to 300kHz Silicon Timer
FEATURES
DESCRIPTION
The TS3003 is a single-supply, second-generation
5V Supply Voltage
Touchstone Semi oscillator/timer fully specified to
operate at a supply voltage range of 1.55V to 5.25V
while consuming less than 2.4μA(max) supply
current. Requiring only a resistor to set the base
output frequency (or output period) at 25kHz (or
FOUT/PWMOUT Output Period: 40µs(25kHz)
o
RSET = 4.32MΩ
PWMOUT Output Duty Cycle:
o
o
75% for FDIV2:0 = 000
CPWM = 100pF
40µs) with
a
50% duty cycle, the TS3003
PWMOUT Duty Cycle Reduction
timer/oscillator is compact, easy-to-use, and versatile.
Optimized for ultra-long life, low frequency,
battery-powered/portable applications, TS3003 joins
the TS3001, TS3002, TS3004, and TS3006 in
Touchstone’s CMOS timer family in its “NanoWatt
Analog™” series of high-performance analog
integrated circuits.
o
1MΩ Potentiometer
Fully Assembled and Tested
2in x 2in 2-layer circuit board
COMPONENT LIST
DESIGNATION QTY DESCRIPTION
C1
1
100pF ±10%
The TS3003 requires only an RSET = 4.32MΩ
resistor to set the FOUT/PWMOUT output period to
40µs(25kHz). With an on-board 100pF CPWM
capacitor, the duty cycle of PWMOUT is set at
approximately 75%. Further reduction of the duty
cycle is available with an on-board 1MΩ
potentiometer. The complete circuit is designed at a
supply voltage of 5V. The TS3003 is fully specified
over the -40°C to +85°C temperature range and is
available in a low-profile, 10-pin 3x3mm TDFN
package with an exposed back-side paddle.
capacitor (0805)
C2
1
4.7µF ±10%
capacitor (0805)
10MΩ ± 1% (0805)
4.32MΩ ± 1% (0805)
1MΩ Potentiometer
TS3003
R2
R1
1
1
1
1
3
PWM_ADJ
U1
VDD,F_OUT,
PWM_OUT
J1
Test points
1
Jumper
Product datasheet and additional documentation can
be
found
on
the
factory web
site
at
www.touchstonesemi.com.
ORDERING INFORMATION
Order Number
Description
TS3003
Demo Board
TS3003DB
Figure 1. TS3003 Demo Board Circuit
Page 1
© 2013 Touchstone Semiconductor, Inc. All rights reserved.
TS3003 Demo Board
The pulse width is determined based on the period of
FOUT and should never be greater than the period at
FOUT. Make sure the PWM_CNTRL pin is set to at
least 400mV when calculating the pulse width of
PWMOUT. Note VCPWM is approximately 300mV,
which is the RSET voltage. Also note that ICPWM is
approximately 1µA.
DESCRIPTION
The TS3003 requires only an RSET = 4.32MΩ
resistor to set the FOUT/PWMOUT output period to
40µs(25kHz). With an on-board 100pF CPWM
capacitor, the duty cycle of PWMOUT is set at
approximately 75%. Further reduction of the duty
cycle is available with an on-board 1MΩ
potentiometer. The complete circuit is designed at a
supply voltage of 5V and it is shown in Figure 1.
QUICK START PROCEDURE
Required Equipment
The TS3003 is a user-programmable oscillator where
the period of the square wave at its FOUT terminal is
generated by an external resistor connected to the
RSET pin. The output period is given by:
TS3003 Demo Board
DC Power Supply
Oscilloscope Model Agilent DSO1014A or
equivalent
1ꢅ08ꢆ11
ꢀOꢁT (ꢂꢃꢄ) ꢀ
ꢇSꢆT
Two 10X, 15pꢀ//10MΩ oscilloscope probes
Potentiometer screwdriver
Equation 1. FOUT Frequency Calculation
To evaluate the TS3003 silicon timer, the following
steps are to be performed:
With RSET
=
4.32MΩ, the FOUT period is
approximately 40µs (25kHz) with a 50% duty cycle.
As design aids, Tables 1 lists TS3003’s typical ꢀOꢁT
1) Before connecting the DC power supply to the
demo board, turn on the power supply, set the
DC voltage to 5V, and then turn it off.
frequency for various standard values for RSET
.
2) Connect the DC power supply positive terminal to
the test point labeled VDD. Connect the negative
terminal of the DC power supply to the test point
labeled GND.
RSET (MΩ) FOUT (kHz)
0.360
1
300
108
2.49
4.32
6.81
9.76
12
43.37
25
15.86
11.07
9
3) To monitor the FOUT output signal, connect the
signal terminal of an oscilloscope probe to the
test point labeled FOUT and the ground terminal
to the test point labeled GND.
Table 1: FOUT vs RSET
4) To monitor the PWMOUT output signal, connect
the signal terminal of a second oscilloscope
probe to the test point labeled PWM_OUT and
the ground terminal to the test point labeled GND.
The TS3003 also provides a separate PWM output
signal at its PWMOUT terminal that is anti-phase with
respect to FOUT. To adjust the pulse width of the
PWMOUT output, a single capacitor can be placed at
the CPWM pin. To determine the capacitance needed
for a desired pulse width, the following equation is to
be used:
5) Select two channels on the oscilloscope and set
the vertical voltage scale and the vertical position
on each channel to 2V/DIV and 0V, respectively.
Set the horizontal time scale to 5µs/DIV. The
coupling should be DC coupling. Turn on the
power supply.
Pulse Width(s) ꢉ ꢊCPWM
CPWM(ꢀ)ꢈ
ꢋCPWMꢀꢁꢀꢌ00mꢋ
The supply current will vary depending on the
load on the output. Given the default set-up on
the board, the FOUT/PWMOUT output period is
approximately 40µs. The PWMOUT duty cycle is
set to approximately 75%. With an output load of
Equation 2. CPWM Capacitor Calculation
where ICPWM and VCPWM is the current supplied and
voltage applied to the CPWM capacitor, respectively.
TS3003DB r1p0
Page 2
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TS3003 Demo Board
15pF on both FOUT and PWMOUT outputs due
to the oscilloscope probes, the supply current
should be less than 8µA.
6) If further reduction of the duty cycle of the
PWMOUT output is desired, turn the
potentiometer clockwise. If jumper J1 is removed,
the PWM_CNTRL pin is tied to VDD and the
potentiometer will not change the PWMOUT
output duty cycle.
TS3003DB r1p0
Page 3
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TS3003 Demo Board
Period vs RSET
120
100
80
60
40
20
0
0
2
4
6
8
10
12
RSET - MΩ
Figure 2. FOUT/PWMOUT Period vs RSET
Figure 3. Top Layer View #1
Figure 4. Top Layer View #2
Figure 6. Bottom Layer (GND) #2
TS3003DB r1p0
Figure 5. Bottom Layer (GND) #2
Page 4 Touchstone Semiconductor, Inc.
630 Alder Drive, Milpitas, CA 95035
+1 (408) 215 - 1220 ▪ www.touchstonesemi.com
RTFDS
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