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参数资料
| 型号： | ILC1232M |
| 厂商： | Impala Linear Corporation |
| 英文描述： | mP Supervisory Circuit |
| 中文描述： | 手机监控电路 |
| 文件页数： | 3/5页 |
| 文件大小： | 75K |
| 代理商： | ILC1232M |
Pin
Number
1
Pin
Name
PBRST
Description
Pushbutton reset input. This input is debounced and can be driven with
external logic signals or a mechanical push button to actively force a reset.
All pulses less than 1ms in duration on the PBRST pin are ignored. Any
pulse with a duration of 20ms or greater is guaranteed to cause a reset.
Time delay input. This input selects the timebase used by the watchdog
timer. When TD = 0V, the watchdog timeout period is set to a nominal
value of 150ms, when TD = open, the watchdog timeout period is set to a
nominal value of 600ms and when TD = V
CC
, the watchdog timeout period
is 1.2 sec nominally.
Tolerance select input. Selects whether 5% or 10% of V
CC
is used as the
reset threshold voltage. When TOL = 0 V, the 5% tolerance level is
selected and when TOL = V
CC
, a 10% tolerance level is selected.
Ground pin, 0V reference.
RST is asserted high if either V
CC
goes below the reset threshold, the
watchdog times out or PBRST is pulled low for a minimum of 20ms. RST
remains asserted for one reset timeout period after V
CC
exceeds the reset
threshold or after the watchdog times out or after PBRST goes high.
RST is asserted low if either V
CC
goes below the reset threshold, the
watchdog times out or PBRST is pulled low for a minimum of 20ms. RST
remains asserted for one reset timeout period after V
CC
exceeds the reset
threshold or after the watchdog times out or after PBRST goes high.
Open-drain output.
Input to the watchdog timer. If ST does not see a transition from high to
low within the watchdog timeout period, RST and RST will be asserted.
Power supply input, 5V.
2
TD
3
TOL
4
5
GND
RST
6
RST
7
ST
8
V
CC
8
1
Reset
Generator
6
4
-
+
V
CC
ST
RST
GND
3
7
2
Trip Point
Select
Ref
Manual Reset
Debounce
Watchdog
Timer
Timeout
Select
5
RST
TOL
PBRST
TD
ILC1232 mP Supervisory Circuit
Sept 1999
Impala Linear Corporation
3
(408) 574-3939
www.impalalinear.com
ILC1232 1.1
June 1999
Pin Functions
Block Diagram
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