器件名称: ATA5021
功能描述: Low Current Consumption: IVDD < 25 ?A
文件大小: 535.84KB 共13页
简 介:Features
Low Current Consumption: IVDD < 25 A RC Oscillator Internal Reset During Power-up and Supply Voltage Drops (POR) “Short” Trigger Window for Active Mode “Long” Trigger Window for Sleep Mode Cyclical Wake-up of the Microcontroller in Sleep Mode Trigger Input Single Wake-up Input Reset Output Enable Output
Digital Window Watchdog Timer ATA5021
1. Description
The digital window watchdog timer, ATA5021, is designed in Atmel’s state-of-the-art 0.8 m SOI technology SMART-I.S.1. In applications where safety is critical, it is especially important to monitor the microcontroller. Normal microcontroller operation is indicated by a cyclically transmitted trigger signal, which is received by a window watchdog timer within a defined time window. A missing or a wrong trigger signal causes the watchdog timer to 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), the ATA5021 offers a complete monitoring solution for micro-systems in automotive and industrial applications.
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Figure 1-1.
Block Diagram with External Circuit
C VDD 10 nF R1 6 OSC 8 C1 Reset 5 RC oscillator OSC
VDD
Microcontroller Trigger 2
State machine OSC Input signal conditioning POR Power-on reset POR Test logic 4 Enable External switching circuitry
Mode 3
Wake-up
1 GND
7
2
ATA5021
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ATA5021
2. Pin Configuration
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