HA1835P 데이터 시트보기 (PDF) - Hitachi -> Renesas Electronics

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HA1835P

Watchdog Timer

Hitachi -> Renesas Electronics 

HA1835P/HA1848P

Pin Arrangement

RR 1

CR 2

P-RUN 3

14 RES

13 RES

12 CS

Rf 4

Cf 5

Vout 6

11 VCC

10 VCONT

9 Comp *

GND 7

8 Vadj

(Top View)

Note: HA1848P: 9 pin is non connection.

Pin Functions

Pin No. Symbol

Functions

1

RR

Reset pulse width depends on resistance connected to RR

Recommended range: 100 kΩ to 1 MΩ

2

CR

Reset pulse width depends on capacitance connected to CR

3

P-RUN

Clock pulse input terminal for watchdog timer

4

Rf

Frequency band width of filter circuit depends on resistance connected to Rf

Recommended range: 100 kΩ to 500 kΩ

5

Cf

Frequency band width of filter circuit depends on capacitance connected to Cf

6

Vout

Connect to external PNP transistor's collector: This pin supplies 5 V regulated

voltage for internal circuit

7

GND

Ground

8

Vadj

Output voltage fine tuning terminal

9

Comp

Phase compensation terminal: Connect less than 100 pF capacitor between VCC

and Comp. HA1848P is non connection

10

VCONT

External PNP transistor's base control terminal

11

VCC

Supply voltage terminal: Operating supply voltage range is 6 V to 30 V

12

CS

Connect current sense resistor, which protects the external PNP transistor,

between VCC and CS

13

RES *

Reset pulse output terminal for low level reset type microcomputer

14

RES *

Reset pulse output terminal for high level reset type microcomputer

Note: RES and RES are open-collector output terminals, so connect a pull-up resistor of about 5 kΩ.

2

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