Features: · 5V supply monitor
· Selectable watchdog period
· Debounce manual push-button reset input
· Precision temperature-compensated voltage reference and comparator.
· Power-up, power-down and brown out detection
· 250ms minimum reset time
· Active LOW open drain reset output and active HIGH push-pull output
· Selectable trip point tolerance: 5% or 10%
· Low-cost surface mount packages: 8-pin/16-pin SO, 8-pin DIP and 8-pin Micro SO packages
· Wide operating temperature -40°C to +85°C (N suffixed devices)Pinout
Specifications
| Parameter |
Min |
Max |
Unit |
| Voltage on VCC |
-0.5 |
7 |
V |
| Voltage on ST , TD |
-0.5 |
VCC + 0.5 |
V |
| Voltage on PBRST , RESET, RESET |
-0.5 |
VCC + 0.5 |
V |
| Operating Temperature Range (N suffixed devices) |
-40 |
+85 |
°C |
| Operating Temperature Range (others) |
0 |
70 |
°C |
| Soldering Temperature (for 10 sec) |
|
+260 |
°C |
| Storage Temperature |
-55 |
+125 |
°C |
ESD rating
HBM
MM |
|
2
200 |
KV
V |
DescriptionThe ASM1232LP/LPS is a fully integrated microprocessor supervisor. It can halt and restart a "hung-up" microprocessor,restart a
microprocessor after a power failure. ASM1232LP has a watchdog timer and external reset override. A precision temperature-compensated
reference and comparator circuits monitor the 5V, VCC input voltage status.
During power-up of ASM1232LP or when the VCC power supply falls outside selectable tolerance limits, both RESET and RESET become active.
When VCC rises above the threshold voltage, the reset signals remain active for an additional 250ms minimum,allowing the power
supply and system microprocessor to stabilize. The trip point tolerance signal of ASM1232LP, TOL, selects the trip level tolerance to be either 5% or 10%.
Each device of ASM1232LP has both a push-pull, active HIGH reset output and an open drain active LOW reset output. A debounced manual reset
input, PBRST , activates the reset outputs for a minimum period of 250ms.
There is a watchdog timer to stop and restart a microprocessor that is "hung-up". The watchdog timeouts periods of ASM1232LP are selectable:
150ms, 610ms and 1200ms. If the ST input is not strobed LOW before the time-out period expires, a reset is generated.
ASM1232LP are available in 8-pin DIP, 16-pin SO and compact 8-pin MicroSO packages.
ASM1232LP Data Sheet
