TS3002 TOUCHSTONE [Touchstone Semiconductor Inc], TS3002 Datasheet - Page 10

• Manufacturer Part Number: TS3002
• Description: A 1V/1uA Easy-to-Use Silicon Oscillator/Timer
• Manufacturer: TOUCHSTONE [Touchstone Semiconductor Inc]

TS3002
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 = 0Ω and with P1 =200kΩ, the
resulting output frequency is 24.024kHz.
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Figure 3: Configuring the TS3002 into a Voltage-
Figure 4: Using a Fixed Resistor and a
Controlled Oscillator.
Potentiometer to Trim the TS3002’s
Output Frequency.
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 = 91kΩ and R2 = 910kΩ,
the output frequency is 90kHz and with R1 = 400kΩ
and R2 = 4MΩ, the output frequency is 23kHz.
Figure 5: Setting the TS3002’s Output
Frequency to 0.1% Resolution using
Standard Resistors.
TS3002DS r1p0
RTFDS