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U5020M 参数 Datasheet PDF下载

U5020M图片预览
型号: U5020M
PDF下载: 下载PDF文件 查看货源
内容描述: 数字窗口看门狗定时器 [Digital Window Watchdog Timer]
分类和应用:
文件页数/大小: 8 页 / 110 K
品牌: TEMIC [ TEMIC SEMICONDUCTORS ]
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U5020M
Digital Window Watchdog Timer
Description
The digital window watchdog timer, U5020M, is a CMOS
integrated circuit. In application where safety is critical,
it is especially important to monitor the microcontroller.
Normal microcontroller operation is indicated by a cycli-
cally transmitted trigger signal, which is received by a
window watchdog timer within a defined time window. A
missing or a wrong trigger signal makes the watchdog
timer reset the microcontroller. The IC is tailored for
microcontrollers which can work in both full-power and
sleep mode. With an additional voltage monitoring
(power-on reset and supply voltage drop reset) U5020M
offers a complete monitoring solution for microsystems
in automotive and industrial applications.
Features
D
Low current consumption: I
DD
< 100
m
A
D
RC–oscillator
D
Internal reset during power-up and supply voltage
drops (POR)
D
Trigger input
D
Six wake-up inputs
D
Reset output
D
Enable output
D
“Short” trigger window for active mode
“long” trigger window for sleep mode
D
Cyclical wake-up of microcontroller in sleep mode
Ordering Information
Extended Type Number
U5020M–FP
Package
SO16
Remarks
Block Diagram
C
R
1
V
DD
C
1
Reset 10
Input t
s
16
OSC
Trigger 11
Input signal
conditioning
POR
State machine
9
Enable
Power–on
reset
POR
Test logic
External
switching
circuitry
OSC
15
RC
Oscillator
OSC
V
DD
10 nF
13
95 10387
m
C
Mode 12
Wake up 3–8
14
GND
2
Test
1
Test
Figure 1. Block diagram with external circuit
TELEFUNKEN Semiconductors
Rev. A3, 27-Feb-97
1 (8)
Preliminary Information