Description

The STM690A/692A/703/704/802/805/817/818/819 supervisors are self-contained devices which provide microprocessor supervisory functions with the ability to non-volatize and write-protect external LPSRAM. A precision voltage reference and comparator monitors the VCC input for an out-of-tolerance condition. When an invalid VCC condition occurs, the reset output (RST) is forced low (or high in the case of RST). These devices also offer a watchdog timer (except for STM703/704/819) as well as a power-fail comparator (except for STM818) to provide the system with an early warning of impending power failure.

Features

■ 5 V operating voltage

■ NVRAM supervisor for external LPSRAM

■ Chip-enable gating (STM818 only) for external LPSRAM (7 ns max prop delay)

■ RST and RSToutputs

■ 200 ms (typ) trec

■ Watchdog timer - 1.6 sec (typ)

■ Automatic battery switchover

■ Low battery supply current - 0.4 µA (typ)

■ Power-fail comparator (PFI/PFO)

■ Low supply current - 40 µA (typ)

■ Guaranteed RST(RST) assertion down to VCC = 1.0 V

■ Operating temperature: –40 °C to +85 °C (industrial grade)

■ RoHS compliance

– Lead-free components are compliant with the RoHS directive

STM817属于集成电路（IC） > 监控器。意法半导体（ST）集团制造生产的STM817监控器PMIC 监控器用于监视和/或控制电路中的电压轨，能够连接微控制器以维持一定的功率限值。监控器类型包括电池备用电路、监控器、多电压监控器、电源监控器、稳压器/监控器、复位计时器、定序器、简单复位/上电复位、智能开/关控制器、系统管理器、电压检测器和看门狗电路。