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HA16129

Single Watchdog Timer

Hitachi -> Renesas Electronics 

HA16129FPJ

Pin Function

Related Pin

Function No.

WDT.

1

2

3

tRH, tRL, tOFF 4

5

t ON

6

tr, tRES

7

—

8

Vout

9

Output

10

Power

11

supply

Current

12

limiter

Vout

13

14

NMI

15

16

Output

17

Output

18

STBY

19

Output

20

Symbol

P-RUN

Rf

Cf

RR

CR

RT

CRES

GND

Voadj

OUTE

VCC

CS

CONT

VOUT

NMIsns

NMIadj

NMI

RES

STBYadj

STBY

Function

Watchdog timer pulse input. The auto-reset function is controlled by the

duty cycle or frequency of this input pulse signal.

The resistor connected to this pin determines the current that flows in the

Cf pin capacitor. Use the resistor value from 100 kΩ to 500 kΩ

The current determined by the Rf pin charges the Cf capacitor and the

potential on this pin determines the watchdog timer frequency band.

The resistor connected to this pin determines the current that flows in the

CR pin capacitor. Use the resistor value from 100 kΩ to 500 kΩ

The current determined by the RR pin charges the capacitor CR and the

potential on this pin controls the RES function (toff, tRH, and tRL).

The resistor RT, which determines only the time tON for the RES function is

connected to this pin. This resistor determines the current that charges the

capacitor CR for the time tON. Use the resistor value from 100 kΩ to 500 kΩ

The current determined by the Rf pin charges the capacitor CRES, and the

RES delay times (Tr and TRES) are determined by the potential of this

capacitor.

Ground

Insert the resistor Roadj if fine adjustment of the regulator output voltage

Vout is required. Leave this pin open if Vout does not need to be changed.

Output for the OUTE function

Power supply

Current limiter current detection. Connect the overcurrent detection

resistor between the CS pin and the VCC pin. If this function is not used,

short this pin to VCC. Also, connect this pin to the emitter of the external

transistor. (This function can not operate when VOUT < 2 V)

Connect this pin to the base of the external transistor.

Provides the regulator output voltage and the IC internal power supply.

Connect this pin to the collector of the external transistor.

This pin senses the NMI detection voltage. If VCC is to be detected,

connect this pin to the V CC pin (however, note that an external resistor is

required), and if Vout is to be detected, connect this pin to the VOUT pin.

Insert a resistor if fine adjustment of the NMI detection voltage is required.

Leave this pin open if fine adjustment is not required.

NMI output

RES output

Insert a resistor if fine adjustment of the STBY detection voltage is

required. Leave this pin open if fine adjustment is not required.

STBY output

4

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