STM6321 Просмотр технического описания (PDF) - STMicroelectronics

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STM6321

5-pin supervisor with watchdog timer and push-button reset

STMicroelectronics 

Operation

STM632x, STM682x

Figure 12. Ensuring RST valid to VCC = 0, (active low push-pull outputs)

STM6XXX

GND

VCC

RST

VCC

R1

AI09138

Figure 13. Ensuring RST valid to VCC = 0, (active high, push-pull outputs)

STM6XXX

GND

VCC

RST

VCC

R1

AI09139

1. This configuration does not work on open drain outputs of the STM6321/6322/6822.

2.6

Interfacing to microprocessors with bidirectional reset pins

Microprocessors with bidirectional reset pins can contend with the STM6321 / 6322 / 6821 /

6822 / 6823 / 6824 / 6825 reset output. For example, if the reset output is driven high and the

microprocessor wants to pull it low, signal contention will result. To prevent this from

occurring, connect a 4.7 kΩ resistor between the reset output and the microprocessor’s

reset I/O as in Figure 14.

Figure 14. Interfacing to microprocessors with bidirectional reset I/O

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DocID11110 Rev 13

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