Datasheet
Voltage Detector
Voltage Detector ICs with Watchdog Timer
for Automotive
BD37BxxFVM-C BD87BxxFVM-C BD87BxxG-C
General Description
Key Specifications
BD37BxxFVM-C, BD87BxxFVM-C and BD87BxxG-C
integrate a Reset (RESET) that monitors the input
voltage of the microcomputer and a Watchdog Timer
(WDT) that monitors the clock signal of the
microcomputer. Even with its wide input voltage up to
20 V the quiescent current is kept low, making it
possible to improve redundancy of various system with
low current consumption. The RESET detection voltage
can be selected either from fixed type or from variable
type just by adjusting the external resister. Also, the
RESET delay time and Watchdog monitor time can be
adjusted by the external capacitor.
◼ Wide Temperature Range (Ta): -40 °C to +125 °C
◼ Wide Input Voltage Range:
◼ Low Quiescent Current:
-0.3 V to +20 V
3.0 µA (Typ)
Packages
MSOP8
W (Typ) x D (Typ) x H (Max)
2.9 mm x 4.0 mm x 0.9 mm
2.9 mm x 2.8 mm x 1.25 mm
SSOP6
Features
◼ AEC-Q100 Qualified(Note 1)
MSOP8
SSOP6
◼ Functional Safety Supportive Automotive Products
◼ Qualified for Automotive Applications
◼ Integrated Power ON and Under-Voltage Detection
Reset
◼ Integrated Watchdog Timer
◼ Adjustable Reset Delay Time and Watchdog Monitor
Time by External Capacitor
◼ Adjustable Detection Voltage Power ON and Under-
Voltage Detection Reset by External Resister(Note 2)
(Note 1) Grade 1
(Note 2) BD87B00FVM-C only
Applications
◼ Power Train
◼ Body Control Unit
◼ Car Infotainment System
Typical Application Circuits
◼ External Components
Capacitor: 0.001 µF ≤ CCT ≤ 47 µF, 0.00047 µF ≤ CCTW ≤ 10 µF
Resistor: 10 kΩ (Min) ≤ RRO, 10 kΩ ≤ R1 ≤ 200 kΩ, 5 kΩ ≤ R2 ≤ 150 kΩ
VRO
VRO
RRO
RRO
RO
CT
Reset Output
VDD
INH
Input Voltage
VDD
ADJ
CLK
RO
CT
Reset Output
Input Voltage
Inhibit Signal
CVDD
R1
R2
CCT
CCT
Clock Signal
CTW
Clock Signal
CLK
CTW
CCTW
CCTW
GND
GND
BD37BxxFVM-C/BD87BxxFVM-C/BD87BxxG-C(Note 2)
(Note 2) BD87BxxG-C do not have the INH pin, and the WDT is always ON
BD87B00FVM-C
〇Product structure : Silicon integrated circuit 〇This product has no designed protection against radioactive rays.
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