TS3001ITD822T datasheet(7/10 Pages) TOUCHSTONE

Part #	TS3001ITD822T

Description	A 1V/1uA Easy-to-Use Resistor-Tuned Silicon Oscillator/Timer

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Manufacturer	TOUCHSTONE [Touchstone Semiconductor Inc]

Direct Link	http://www.touchstonesemi.com

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7 / 10 page

TS3001

TS3001DS r1p0

Page 7

RTFDS

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:

FOUT (kHz) =

1

tFOUT ( s)

1

k x R T MΩ

where the scalar k is approximately 9.09E3. With an

RSET

=

4.32M

Ω,

the

output

frequency

is

approximately 25kHz with a 50% duty cycle. As

design aids, Tables 1 lists TS3001

’s typical FOUT for

various standard values for RSET.

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.

Table 1: FOUT vs RSET

RSET (MΩ)

FOUT (kHz)

1

110

2.49

44

4.32

25.5

6.81

16

9.76

11

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TS3001ITD822T Datasheet(PDF) 7 Page - Touchstone Semiconductor Inc

TS3001ITD822T Datasheet(HTML) 7 Page - Touchstone Semiconductor Inc

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