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STM6823SWY6F Datasheet(PDF) 5 Page - STMicroelectronics |
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STM6823SWY6F Datasheet(HTML) 5 Page - STMicroelectronics |
5 / 21 page 5/21 STM6321/6322/6821/6822/6823/6824/6825 Pin Descriptions Active-Low, Push-pull Reset Output (RST) - STM6822/6823/6824/6825. Pulses low when trig- gered, and stays low whenever VCC is below the reset threshold or when MR is a logic low. It re- mains low for trec after either VCC rises above the reset threshold, the watchdog triggers a reset, or MR goes from low to high. 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. Push-button Reset Input (MR). A logic low on MR asserts the reset output. Reset remains as- serted as long as MR is low and for trec after MR returns high. This active-low input has an internal 52k Ω pull-up. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if unused. Watchdog Input (WDI). If WDI remains high or low for at least 1.6sec, the internal watchdog timer expires and reset is asserted. The internal watch- dog 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 unconnect- ed or is connected to a tri-state buffer output. Active-High Reset Output. Active-high, push- pull reset output; inverse of RST. Table 3. Pin Functions Figure 6. Block Diagram (STM6xxx) Note: 1. For STM6321/6821/6822/6823/6824 2. For STM6322/6821/6822/6823/6825 3. For STM6821/ (RST output only) 4. For STM6321/6322/6824/6825 (both RST and RST outputs) Pin Name Function STM6822 STM6823 STM6821 STM6321 STM6824 STM6322 STM6825 1– 11 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 55 VCC Supply Voltage 22 22 VSS Ground AI09132 VRST RST (RST) (3) WATCHDOG TIMER WDI Transitional Detector COMPARE trec Generator VCC WDI (1) MR (2) RST (4) VCC |
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