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STM6823ZWY6F Datasheet(PDF) 7 Page - STMicroelectronics |
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STM6823ZWY6F Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 26 page STM6321/6322STM6821/6822/6823/6824/6825 Summary description 7/26 1.1 Pin descriptions 1.1.1 Active-low, push-pull reset output (RST) - STM6822/6823/6824/6825 Pulses low when triggered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for trec after either VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes from low to high. 1.1.2 Active-low, open drain reset output (RST) - STM6321/6322/6822 Pulses low when triggered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It remains low for trec after either VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes from low to high. Connect a pull-up resistor to supply voltage. 1.1.3 Push-button reset input (MR) A logic low on MR asserts the reset output. Reset remains asserted as long as MR is low and for trec after MR returns high. This active-low input has an internal 52kΩ pull-up. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if unused. 1.1.4 Watchdog input (WDI) If WDI remains high or low for at least 1.6s, the internal watchdog timer expires and reset is asserted. The internal watchdog timer clears while reset is asserted or when WDI sees a rising or falling edge. The watchdog function CAN be disabled if WDI is left unconnected or is connected to a tri-state buffer output. 1.1.5 Active-high reset output (RST) Active-high, push-pull reset output; inverse of RST. Table 3. Pin functions Pin Name Function STM6822 STM6823 STM6821 STM6321 STM6824 STM6322 STM6825 1— 1 1 RST Active-Low Reset Output 33 — 4 MR Push-button Reset Input 4 4 4 — WDI Watchdog Input — 1 3 3 RST Active-High Reset Output 55 5 5 VCC Supply Voltage 22 2 2 VSS Ground |
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