BD87A19F View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BD87A19F

Voltage Detector ICs with Watchdog Timer

ROHM Semiconductor 

BD37Axx Series BD87Axx Series BD99A41F

●Pin Configurations

MSOP8

(TOP VIEW)

8765

SOP8

(TOP VIEW)

8765

Datasheet

1234

1234

Figure 1. Pin Configurations

●Pin Descriptions

No.

Pin

name

BD37AxxFVM

Function

1 CLK Clock input from microcontroller

2

CT

Reset delay time setting capacitor

connection pin

3 CTW WDT time setting capacitor connection pin

No.

Pin

name

BD87AxxFVM / BD99A41F

Function

1 CTW WDT time setting capacitor connection pin

2

CT

Reset delay time setting capacitor

connection pin

3 CLK Clock input from microcontroller

4 VDD Power supply pin

4 GND GND pin

5 N.C. NC pin

6 GND GND pin

7

INH

WDT ON/OFF setting pin

INH=H/L:WDT=ON/OFF

8 RESET Reset output pin

5 VDD Power supply pin

WDT ON/OFF setting pin

6 INH INH=H/L:WDT=OFF/ON(BD87AxxFVM)

INH=H/L:WDT=ON/OFF(BD99A41F)

7 N.C. NC pin

8 RESET Reset output pin

●Block Diagrams

BD37AxxFVM

BD87AxxFVM / BD99A41F

CLK

1

CT

2

+

Vref

Pulse

Generation

CTW Circuit

3

VDD

R

SQ

VDD

+

RQ

S

+

VthH VthL

VDD

4

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TSZ22111・15・001

RESET

8

INH

7

GND

6

N.C.

5

CTW

1

CT

2

CLK

3

Pulse

Generation

Circuit

+

Vref

VDD

R

SQ

VDD

+

RQ

+

S

VthH VthL

GND

4

CT pin capacitor: 470pF to 3.3µF

CTW pin capacitor: 0.001µF to 10µF

Figure 2.Block Diagrams

RESET

8

N.C.

7

INH

6

VDD

5

2/15

TSZ02201-0T2T0AN00130-1-2

25.Apr.2013 Rev.002

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