STM6823ZAWY6E(2007) View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

STM6823ZAWY6E
(Rev.:2007)

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

STMicroelectronics 

Operation

STM6321/6322STM6821/6822/6823/6824/6825

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 bi-directional reset pins

Microprocessors with bi-directional 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 4.7kΩ resistor between the reset output and the microprocessor’s reset

I/O as in Figure 14.

Figure 14. Interfacing to microprocessors with bi-directional reset I/O

Buffered Reset to other

System Components

VCC

STM6XXX

4.7k

RST

GND

VCC

Microprocessor

RST

GND

AI09135

12/26

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