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STM6904PWEDS6E Datasheet(PDF) 7 Page - STMicroelectronics |
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STM6904PWEDS6E Datasheet(HTML) 7 Page - STMicroelectronics |
7 / 21 page STM6904 Pin descriptions 7/21 2 Pin descriptions 2.1 Push-button reset input (MR) When MR goes low the RST output is driven low, RST remains low as long as MR is low and for tREC after MR returns to high. The active-low input has an internal 10k ohm pull-up resistor to VCC. It can be driven from a TTL or CMOS logic line, or with open drain/collector outputs, or connected to VSS through a switch. If unused, leave this pin open or connect it to VCC. Connect a normally open momentary switch from MR to VSS; external debounce circuitry is not required. (If MR is driven from long cables or if the device is used in noisy environments, connecting a 0.1 uF capacitor from MR to VSS provides additional noise immunity). 2.2 VCC primary supply voltage monitoring input The VCC pin is also the input for the primary reset threshold monitor. Fixed (customer- selectable, factory programmed) reset thresholds include 3.078 V to 2.866 V. 2.3 V2IN second fixed voltage monitoring input The V2IN input is the second fixed-voltage input for reset threshold monitoring. Available fixed (customer-selectable, factory programmed) reset thresholds include 2.333 V to 1.050 V. 2.4 VSS This pin is the ground pin for the power supply. 2.5 V3IN and V4IN The V3IN and V4IN are high impedance inputs. RST is driven low when the voltage (VTRIP) at the pin falls below 600 mV (internal reference voltage at their respective comparators). The monitored voltage reset threshold is set with an external resistor-divider network. 2.6 RST active-low, open drain reset output The reset output (RST) pin is driven low and stays low whenever VCC or V2IN, or V3IN, or V4IN falls below its factory-trimmed or adjustable reset threshold or when MR goes to logic low. It remains low for trec after all supply voltages being monitored rise above their reset thresholds and MR goes from low to high. Connect an external pull-up resistor to VCC. A 10k ohms pull-up resistor should be sufficient for most applications. |
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