TS3002-EVB User Guide

TS3002 1V/1µA Easy-to-Use Silicon
Oscillator/Timer Demo Board
FEATURES
DESCRIPTION

The demo board for the TS3002 is a completely
assembled and tested circuit board that can be used
for evaluating the TS3002. 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.
The TS3002 is the first oscillator in the “NanoWatt
Analog™” high-performance analog integrated
circuits portfolio. The TS3002 can operate from a
single-supply voltage from 0.9V to 1.8V.




FOUT Output frequency: 25kHz
o RSET = 4.32MΩ, CSET = 7.9pF
PWMOUT Output Duty Cycle Range:
o 12% to 90%
Programmable Frequency Range:
o 5.2kHz ≤ FOUT ≤ 90kHz (BOOST = GND)
o 5.2kHz ≤ FOUT ≤ 290kHz (BOOST = VDD)
Fully Assembled and Tested
2in x 2in 2-layer circuit board
COMPONENT LIST
DESIGNATION
QTY
DESCRIPTION
C1
1
C2
1
R1
R2
PWM_ADJ
U1
VDD-GND,F_OUT,
PWM_OUT
IBOOST, J1
1
1
1
1
3
0.1µF ±10%
capacitor (0805)
7.9pF ±10%
capacitor (0805)
1MΩ ± 1% (0805)
4.32MΩ± 1% (0805)
1MΩ Potentiometer
TS3002
Test points
2
Jumpers
The TS3002 requires only a resistor and a capacitor
to set the output frequency. The demo board is
available with an on-board 4.32MΩ RSET resistor and
7.9pF CSET capacitor that sets FOUT, at 25kHz. In
addition, a PWMOUT output is made available where
a voltage controlled pin is available to modulate the
duty cycle of the signal from 12% to 90%. The
TS3002 is fully specified over the -40°C to +85°C
temperature range and is available in a low-profile, 8pin 2x2mm TDFN package with an exposed backside paddle.
Product data sheet and additional documentation can
be found at www.silabs.com.
ORDERING INFORMATION
Order Number
TS3002DB
Figure 1. TS3002 Oscillator/Timer Circuit
Description
TS3002
Demo Board
Figure 2. TS3002 Evaluation Board
Page 1
© 2014 Silicon Laboratories, Inc. All rights reserved.
TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board
DESCRIPTION
The demo board includes an on-board 0.1µF
decoupling capacitor at the VDD pin. To modulate the
duty cycle of the PWMOUT signal, adjust the
potentiometer counter-clockwise to increase the duty
cycle and vice versa. The PWMOUT is wired antiphase with the FOUT output and can be disabled by
removing jumper J1. Furthermore, when the BOOST
pin is connected to VDD, the propagation delay of the
internal comparators is reduced and in turn, extends
the high end of the master oscillator frequency from
90kHz to 290kHz. The default setting for the BOOST
pin is GND. An on-board jumper can be used to set
the BOOST pin.
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:
FOUT (kHz) =
1E6
1
tFOUT (µs) k ∙ RSET MΩ x CSET (pF)
where the scalar k is approximately 1.19. As design
aids, Tables 1 lists TS3002’s typical FOUT for various
standard values for RSET with CSET = 7.9pF and Table
2 lists typical FOUT for various standard values for
CSET with RSET = 4.32MΩ. Furthermore, refer to page
4 and 5 for a series of plots of FOUT frequency and
period vs RSET and CSET.
Table 1: FOUT vs RSET, CSET = 7.9pF
RSET (MΩ)
1
2.49
4.32
6.81
9.76
FOUT (kHz)
106
43
25
16
11
QUICK START PROCEDURE
Required Equipment

TS3002 Demo Board

A DC Power Supply

Oscilloscope
equivalent

Two 10X, 15pF//10MΩ oscilloscope probes

Potentiometer screwdriver
Model
Page 2
or
1) Before connecting the DC power supply to the
demo board, turn on the power supply, set the
DC voltage to 1V, and then turn it off.
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.
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.
4) To monitor the PWMOUT output signal, connect
the signal terminal of a second oscilloscope
probe to the test point labeled PWMOUT and the
ground terminal to the test point labeled GND.
5) To minimize transient power consumption of the
probe capacitance of the oscilloscope, a seriesconnected capacitor can be added at either or
both FOUT and PWMOUT terminals. To
determine what the external series capacitor
value should be, use the following expression:
CEXT =
FOUT (kHz)
39
25
19
13
10
DSO1014A
To evaluate the TS3002 silicon oscillator/timer, the
following steps are to be performed:
Table 2: FOUT vs CSET, RSET = 4.32MΩ
CSET (pF)
5
7.9
10
15
20
Agilent
1
1
1
–
CLOAD(EFF) CPROBE
where CEXT is the external series capacitor,
CLOAD(EFF) is the effective load capacitance, and
CPROBE is the capacitance of the oscilloscope
probe.
TS3002-EVB Rev. 1.0
TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board
6)
Select two channels on the oscilloscope and set
the vertical voltage scale and the vertical position
on each channel to 200mV/DIV and 500mV,
respectively. Set the horizontal time scale to
20µs/DIV. The coupling should be DC coupling.
Turn on the power supply. The supply current will
vary depending on the load on the output, the
BOOST pin setting, and whether the PWMOUT is
enabled or disabled. Given the default set-up on the
board with BOOST set to 0V, the PWMOUT duty
cycle is set to ~49.3%. With an output load of 15pF
on both FOUT and PWMOUT outputs due to the
oscilloscope probes, the supply current should be
less than 3µA. Refer to step 5 in order to minimize
transient power consumption due to the probe
capacitance, which can, in turn, reduce the supply
current.
Period vs RSET
Period vs RSET
200
200
BOOST = GND
BOOST = VDD
160
CSET = 7.9pF
120
PERIOD - µs
PERIOD - µs
160
80
40
CSET = 7.9pF
120
80
40
0
0
0
4
8
12
16
20
0
4
RSET - MΩ
12
16
20
RSET - MΩ
FOUT vs RSET
FOUT vs RSET
100
350
BOOST = GND
80
BOOST = VDD
300
CSET = 7.9pF
CSET = 7.9pF
FREQUENCY - kHz
FREQUENCY - kHz
8
60
40
20
250
200
150
100
50
0
0
0
4
8
12
RSET - MΩ
TS3002-EVB Rev. 1.0
16
20
0
4
8
12
16
20
RSET - MΩ
Page 3
TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board
Period vs CSET
Period vs CSET
100
100
80
PERIOD - µs
PERIOD - µs
BOOST = VDD
BOOST = GND
RSET = 4.32MΩ
80
60
RSET = 4.32MΩ
60
40
40
20
20
0
4
8
12
16
20
0
4
CSET - pF
FOUT vs CSET
16
20
FOUT vs CSET
100
BOOST = GND
30
BOOST = VDD
80
RSET = 4.32MΩ
RSET = 4.32MΩ
FREQUENCY - kHz
FREQUENCY - kHz
12
CSET - pF
40
20
10
0
60
40
20
0
4
8
12
CSET - pF
Page 4
8
16
20
0
4
8
12
16
20
CSET - pF
TS3002-EVB Rev. 1.0
TS3002 1V/1µA Easy-to-Use Silicon Oscillator/Timer Demo Board
Silicon Laboratories, Inc.
400 West Cesar Chavez, Austin, TX 78701
+1 (512) 416-8500 ▪ www.silabs.com
Page 5
TS3002-EVB Rev. 1.0
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