TPL5010DDCT datasheet(11/25 Pages) TI1

Part #	TPL5010DDCT

Description	TPL5010 Nano-power System Timer with Watchdog Function

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Manufacturer	TI1 [Texas Instruments]

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¸

¹

·

¨

©

§

a

T

c

a

b

R

EXT

2

100

4

100

2

VIN

POWER MANAGEMENT

VOUT

GND

µC

GPIO

VDD

GND

Rp

GPIO

RSTn

TPL5010

VDD

GND

RSTn

WAKE

DELAY/

M_RST

DONE

REXT

Battery

VIN

POWER MANAGEMENT

VOUT

GND

µC

GPIO

VDD

GND

Rp

GPIO

RSTn

TPL5010

VDD

GND

RSTn

WAKE

DELAY/

M_RST

DONE

REXT

Battery

11

TPL5010

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SNAS651 – JANUARY 2015

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Programming (continued)

Figure 11. Manual Reset with SPST Switch

For use cases that do not require the lowest power consumption, using a single pole single throw switch may

offer a lower cost solution. The DELAY/M_RST pin may be directly connected to VDD with REXT in the circuit.

The current drawn from the supply voltage during the reset is given by VDD/REXT.

Figure 12. Manual Reset with SPDT Switch

The reset function may also be asserted by switching DELAY/M_RST from REXT to VDD using a single pole

double throw switch, which will provide a lower power solution for the manual reset, because no current flows.

8.5.3 Timer Interval Selection Using External Resistance

In order to set the time interval, the external resistance REXT is selected according the following formula:

(1)

Where:

•

T is the desired time interval in seconds.

•

REXT is the resistance value to use in Ω.

•

a,b,c are coefficients depending on the range of the time interval.

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TPL5010DDCT Datasheet(PDF) 11 Page - Texas Instruments

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