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X40421 - Dual Voltage Monitor

This page provides the datasheet information for the X40421, a member of the X40420 Dual Voltage Monitor family.

Description

The X40420/21 combines power-on reset control, watchdog timer, supply voltage supervision, and secondary supervision, manual reset, and Block Lock™ protect serial EEPROM in one package.

This combination lowers system cost, reduces board space requirements, and increases reliability.

Features

  • Dual voltage detection and reset assertion.
  • Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V).
  • VTRIP2 Programmable down to 0.9V.
  • Adjust low voltage reset threshold voltages using special programming sequence.
  • Reset signal valid to VCC = 1V.
  • Monitor two voltages or detect power fail.
  • Battery Switch Backup.
  • VOUT: 5mA to 50mA from VCC; or 250µA from VBATT.
  • Fault detection register.
  • Selectab.

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Full PDF Text Transcription

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® X40420, X40421 4kbit EEPROM Data Sheet March 28, 2005 FN8117.0 PRELIMINARY Dual Voltage Monitor with Integrated CPU Supervisor and System Battery Switch FEATURES • Dual voltage detection and reset assertion —Three standard reset threshold settings (4.6V/2.9V, 4.6V/2.6V, 2.9V/1.6V) —VTRIP2 Programmable down to 0.9V —Adjust low voltage reset threshold voltages using special programming sequence —Reset signal valid to VCC = 1V —Monitor two voltages or detect power fail • Battery Switch Backup • VOUT: 5mA to 50mA from VCC; or 250µA from VBATT • Fault detection register • Selectable power-on reset timeout (0.05s, 0.2s, 0.4s, 0.8s) • Selectable watchdog timer interval (25ms, 200ms, 1.
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