參數資料
型號: HA16113FPJ
廠商: Hitachi,Ltd.
英文描述: Dual Watchdog Timers
中文描述: 雙看門狗定時器
文件頁數: 3/18頁
文件大?。?/td> 102K
代理商: HA16113FPJ
HA16113FPJ
3
Pin Description
(cont)
Pin No. Symbol
9
Function
For fine adjustment of Vout trigger level for
NMI
signal (insert a resistor between this
pin and Vout or ground)
Recommended range: V
H1
= 4.4 to 5.2 V
For connecting resistor Re1 to determine voltage Vout for microprocessor and IC
internal circuits (insert between this pin and Re2)
For connecting resistor Re2 to determine voltage Vout for microprocessor and IC
internal circuits (insert between this pin and ground)
Ground
Power supply input pin (operating range: 6 to 40 V)
Input for detecting power supply current
For base control of external pnp transistor
Regulated voltage supplied to microprocessor and IC internal circuits Connect to
collector of external pnp transistor
Determines reset pulse delay at voltage drop and recovery.
NMI
output goes low as
soon as Vout drops below
NMI
trigger level. If Vout remains below this level for time
t
, both reset outputs also go low. When Vout recovers above
NMI
trigger level, first
NMI
output goes high, then after time t
both reset outputs also go high. Times t
RES
and
t
r
are adjusted by capacitor C
RES
inserted between this pin and ground.
Reset signal output to sub CPU
Input pin for resetting sub CPU on command, or when sub CPU crashes Low input at
CONT
causes low output at
RES2
Selects simultaneous control, in which main and sub CPUs are both reset when main
CPU crashes, or independent control, in which sub CPU is reset independently of
main CPU
Open—independent control; connected to ground—simultaneous control
For connecting capacitor C
R2
to determine t
off2
, t
RH2
, and t
RL2
of auto-reset circuit 2
For connecting bias resistor R
to determine t
off1
, t
off2
, t
RH1
, t
RH2
, t
RL1
, and t
RL2
. Use the
resistor value from 100 k
to 500 k
.
For connecting capacitor Cf2 to determine WDT2 filter characteristic (frequency band)
Input from sub CPU to watchdog timer 2 (WDT2)
NMI
adj
10
Re1
11
Re2
12
13
14
15
16
GND
V
CC
CS
V
C
Vout
17
C
RES
18
19
RES2
CONT
20
SW
21
22
C
R2
R
R
23
24
Cf2
P-RUN2
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