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STM706TM6E Datasheet(PDF) 6 Page - STMicroelectronics |
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STM706TM6E Datasheet(HTML) 6 Page - STMicroelectronics |
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6 / 26 page  STM706T/S/R; STM706P; STM708T/S/R 6/26 Pin Descriptions 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 pull-up. It can be driven from a TTL or CMOS logic line, or shorted to ground with a switch. Leave open if unused. WDI. If WDI remains high or low for 1.6sec, the in- ternal watchdog timer runs out and reset (or WDO) is triggered. The internal watchdog timer clears while reset is asserted or when WDI sees a rising or falling edge. The watchdog function cannot be disabled by al- lowing the WDI pin to float. WDO. WDO goes low when a transition does not occur on WDI within 1.6sec, and remains low until a transition occurs on WDI (indicating the watch- dog interrupt has been serviced). WDO also goes low when VCC falls below the reset threshold; how- ever, unlike the reset output, WDO goes high as soon as VCC exceeds the reset threshold. Note: For those devices with a WDO output, a watchdog timeout will not trigger reset unless WDO is connected to MR. RST. Pulses low for trec 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. RST. Pulses high for trec when triggered, and stays high whenever VCC is above the reset threshold or when MR is a logic high. It remains high for trec after either VCC falls below the reset threshold, the watchdog triggers a reset, or MR goes from high to low. PFI. When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Connect to ground if unused. PFO. When PFI is less than VPFI, PFO goes low; otherwise, PFO remains high. Leave open if un- used. Table 3. Pin Description Pin Name Function STM706P STM706T/S/R STM708T/S/R SO8 TSSOP8 SO8 TSSOP8 SO8 TSSOP8 131313 MR Push-button Reset Input 6868–– WDI Watchdog Input 8282–– WDO Watchdog Output ––7171 RST Active-Low Reset Output 71––82 RST Active-High Reset Output 242424 VCC Supply Voltage 464646 PFI PFI Power-fail Input 575757 PFO PFO Power-fail Output 353535 VSS Ground ––––68 NC No Connect |
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