Datasheet

X40020
Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch

Overview
Parametrics
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Typical Diagram

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Key Features

Dual voltage detection and reset assertion

Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V)
V_TRIP2 programmable down to 0.9V
Adjust low voltage reset threshold voltages using special programming sequence
Reset signal valid to V_CC = 1V
Monitor two voltages or detect power fail

Battery switch backup
V_OUT: 5mA to 50mA from V_CC, 250µA from V_BATT
Fault detection register
Selectable power-on reset timeout (0.05s, 0.2s, 0.4s, 0.8s)
Selectable watchdog timer interval (25ms, 200ms, 1.4s, off)
Debounced manual reset input
Low power CMOS

25µA typical standby current, watchdog on
6µA typical standby current, watchdog off
1µA battery current in backup mode

400kHz 2-wire interface
2.7V to 5.5V power supply operation
Available packages

14-lead SOIC, TSSOP

Monitor voltages: 5V to 1.6V
Memory security
Pb-free plus anneal available (RoHS compliant)

Description

The X40020 combines power-on reset control, watchdog timer, supply voltage supervision, and secondary supervision, and manual reset, in one package. This combination lowers system cost, reduces board space requirements, and increases reliability.

Applying voltage to V_CC activates the power-on reset circuit which holds RESET/RESET active for a period of time. This allows the power supply and system oscillator to stabilize before the processor can execute code.