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BD87A34FVM Datasheet(PDF) 5 Page - Rohm

Part # BD87A34FVM
Description  Voltage Detector ICs with Watchdog Timer
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Manufacturer  ROHM [Rohm]
Direct Link  http://www.rohm.com
Logo ROHM - Rohm

BD87A34FVM Datasheet(HTML) 5 Page - Rohm

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Technical Note
5/10
www.rohm.com
2010.12 - Rev.A
© 2010 ROHM Co., Ltd. All rights reserved.
BD37A19FVM, BD37A41FVM, BD87A28FVM, BD87A29FVM,
BD87A34FVM, BD87A41FVM, BD99A41F
●
Block diagram
BD37A□□FVM
BD87A□□FVM / BD99A41F
CT pin capacitor: 470 pF to 3.3 µF
CTW pin capacitor: 0.001 µF to 10 µF
Fig.13
●
Pin assignments
Fig.14
BD37A□□FVM
BD87A□□FVM / BD99A41F
No.
Pin
name
Function
No.
Pin
name
Function
1
CLK
Clock input from microcontroller
1
CTW
WDT time setting capacitor connection pin
2
CT
Reset delay time setting capacitor
connection pin
2
CT
Reset delay time setting capacitor
connection pin
3
CTW
WDT 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
5
VDD
Power supply pin
6
GND
GND pin
6
INH
WDT on/off setting pin
INH=H/L:WDT=OFF/ON(BD87A□□FVM)
INH=H/L:WDT=ON/OFF(BD99A41F)
7
INH
WDT on/off setting pin
INH=H/L:WDT=ON/OFF
7
N.C.
NC pin
8 RESET Reset output pin
8 RESET Reset output pin
RESET
INH
Vref
VDD
GND
N.C.
VDD
Pulse
generation
circuit
VthH
VthL
R
S
Q
R
S
Q
+
+
+
CLK
CT
CTW
VDD
1
2
3
4
8
7
6
5
CTW
CT
CLK
GND
RESET
N.C.
Vref
VDD
INH
VDD
VDD
Pulse
generation
circuit
VthH
VthL
R
S
Q
R
S
Q
1
2
3
4
5
6
7
8
+
+
+
87 6 5
12 3 4


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