TS3001 TOUCHSTONE [Touchstone Semiconductor Inc], TS3001 Datasheet - Page 7

• Manufacturer Part Number: TS3001
• Description: A 1V/1uA Easy-to-Use Resistor-Tuned Silicon Oscillator/Timer
• Manufacturer: TOUCHSTONE [Touchstone Semiconductor Inc]

BLOCK DIAGRAM
THEORY OF OPERATION
The TS3001 is a user-programmable oscillator where
the period of the square wave at its FOUT terminal is
generated by an external resistor. The output
frequency is given by:
TS3001DS r1p0
FOUT (kHz) =
R
Table 1: FOUT vs R
SET
2.49
4.32
6.81
9.76
1
(MΩ)
t
FOUT
1
( s)
FOUT (kHz)
25.5
110
44
16
11
k x R
SET
1
T
MΩ
where the scalar k is approximately 9.09E3. With an
R
approximately 25kHz with a 50% duty cycle. As
design aids, Tables 1 lists TS3001’s typical FOUT for
various standard values for R
The TS3001 also provides a separate PWM output
signal at its PWMOUT terminal that is anti-phase with
respect to FOUT. In addition, applying a voltage at
the CNTRL both enables the TS3001’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), the supply current of the TS3001
is 1µA; enabling the PWM engine increases the
TS3001 operating supply current as shown in the
electrical specification table.
SET
=
4.32MΩ,
the
SET
output
.
TS3001
frequency
Page 7
RTFDS
is