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参数资料
| 型号： | ILC1232 |
| 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： | 4/5页 |
| 文件大小： | 75K |
| 代理商： | ILC1232 |
Power Monitor
The RST and RST pins are asserted whenever V
CC
falls
below the reset threshold voltage set by the TOL pin. A 5%
tolerance level (4.62V reset threshold voltage) can be
selected by connecting the TOL pin to ground or a 10% tol-
erance (4.37V reset threshold voltage) can be selected by
connecting the TOL pin to V
CC
. The reset pins will remain
asserted for a period of 250ms after V
CC
has risen above
the reset threshold voltage. The reset function ensures the
microprocessor is properly reset and powers up into a
known condition after a power failure. RST will remain valid
with V
CC
as low as 1.4V.
RST
t
PDLY
t
RST
PBRST
RST
t
PB
Pushbutton Reset Input
The PBRST input can be driven with a manual pushbutton
switch or with external logic signals. The input is internally
debounced and requires an active low signal to force the
reset outputs into their active states. The PBRST input will
recognize any pulse that is 20ms in duration or greater and
will ignore all pulses that are less than 1ms in duration.
Watchdog Timer
The microprocessor can be monitored by connecting the ST
pin (watchdog input) to a bus line or I/O line. If a high-to-low
transition does not occur on the ST pin within the watchdog
timeout period set by the TD pin (see Table 1), the RST and
RST pins will be asserted resulting in a microprocessor
reset. RST and RST will remain asserted for 250ms when
this occurs. A minimum pulse of 75ns or any transition high-
to-low on the ST pin will reset the watchdog timer. The
watchdog timer will be reset if ST sees a valid transition
within the watchdog timeout period.
t
TD
Typ.
150ms
600ms
1200ms
TD Pin
GND
Open
V
CC
Min.
62.5ms
250ms
500ms
Max.
250ms
1000ms
2000ms
Industry P/N
ILC Direct
Replacement
ILC1232N
ILC1232M
ILC1232N
ILC1232N
ILC1232M
ILC1232N
ILC1232N
ILC1232M
ILC1232N
ILC1232M
ILC1232D
DS1232LP
DS1232LPS-2
DS1232
DS1232LPN
DS1232LPSN-2
DS1232N
MAX1232CPA
MAX1232CSA
MAX1232EPA
MAX1232ESA
MAX1232C/D
RST
t
RPD
V
CCTP
V
CCTP
t
RPU
V
CC
RST
t
SD
ST
t
TD
ILC1232 mP Supervisory Circuit
Sept 1999
Circuit Decription
Power-Up/Power-Down Sequence
Pushbutton Reset
Watchdog Input
Table 1: Watchdog Timeout Period
Alternate Cross Reference Guide
Impala Linear Corporation
4
(408) 574-3939
www.impalalinear.com
ILC1232 1.1
June 1999
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| ILC1232N | 制造商:IMPALA 制造商全称:IMPALA 功能描述:mP Supervisory Circuit |
| ILC130ETH | 制造商:Phoenix Contact 功能描述:Inline Controller with Ethernet |
| IL-C1-5000 | 制造商:Japan Aviation Electronics (JAE) 功能描述: |
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