STM6321YWY6F(2008) Просмотр технического описания (PDF) - STMicroelectronics

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производитель

STM6321YWY6F
(Rev.:2008)

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

STMicroelectronics 

Operation

2

Operation

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

2.1

Reset output

The STM6xxx Supervisor asserts a reset signal to the MCU whenever VCC goes below the

reset threshold (VRST), a watchdog time-out occurs, or when the Push-button Reset Input

(MR) is taken low. Reset is guaranteed valid for VCC < VRST down to VCC =1 V for TA = 0°C

to 85°C.

During power-up, once VCC exceeds the reset threshold an internal timer keeps reset low

for the reset time-out period, trec. After this interval reset is de-asserted.

Each time RST is asserted, it stays low for at least the reset time-out period (trec). Any time

VCC goes below the reset threshold the internal timer clears. The reset timer starts when

VCC returns above the reset threshold.

2.2

Open drain RST output

The STM6321/6322/6822 have an active-low, open drain reset output. This output structure

will sink current when RST is asserted. Connect a pull-up resistor from RST to any supply

voltage up to 6 V (see Figure 11). Select a resistor value large enough to register a logic

low, and small enough to register a logic high while supplying all input current and leakage

paths connected to the reset output line. A 10 kΩ pull-up resistor is sufficient in most

applications.

Figure 11. STM6321/6322/6822 open drain RST output with multiple supplies

3.3V

VCC

STM6XXX

10k

MR(1)

WDI(2)

RST(3)

RST

GND

5.0V

5V System

AI09137

1. STM6322/6822

2. STM6321/6822

3. STM6321/6322

10/28

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