TS3002 Datasheet, PDF (8/11 Pages) Touchstone Semiconductor Inc – A 1V/1uA Easy-to-Use Silicon Oscillator/Timer

TS3002
BLOCK DIAGRAM
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
1E
FOUT (kHz) =
t_FOUT ( s) k R_SET MΩ x C_SET(pF)
Table 1: FOUT vs R_SET, C_SET = 7.9pF
R_SET (MΩ)
1
2.49
4.32
6.81
9.76
FOUT (kHz)
106
43
25
16
11
Page 8
where the scalar k is approximately 1.19. With an
R_SET = 4.32MΩ 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_SET with C_SET
= 7.9pF and Table 2 lists typical FOUT for various
standard values for C_SET with R_SET = 4.32MΩ.
The TS3002 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
Table 2: FOUT vs C_SET, R_SET = 4.32MΩ
C_SET (pF)
5
7.9
10
15
20
FOUT (kHz)
39
25
19
13
10
TS3002DS r1p0
RTFDS