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LTC2939HMS Datasheet(PDF) 7 Page - Linear Technology |
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LTC2939HMS Datasheet(HTML) 7 Page - Linear Technology |
7 / 20 page LTC2938/LTC2939 7 293839ff PIN FUNCTIONS VPG: Threshold Select Input. Connect to an external 1% resistive divider between VREF and GND to select one of sixteen combinations of voltage thresholds (see Table 1). Do not add capacitance to the VPG input. VREF: Buffered Reference Voltage Output. A 1.210V nomi- nal reference used for the mode selection voltage (VPG) and for the offset of negative adjustable applications. The buffered reference can source and sink up to 1mA. The reference can drive a bypass capacitor of up to 1000pF without oscillation. WDI: Watchdog Input: A three-state input that controls the operation of the watchdog timer. Leaving the WDI pin unconnected disables the watchdog timer while tying it low or high enables it. While RST is high, a transition between low and high logic levels (rising or falling edge) within the watchdog timeout period is required to inhibit WDO from pulling low and a watchdog initiated reset. A capacitor attached to CWT sets the watchdog timeout period. A transition between the low and high logic levels on the WDI input clears the voltage on the CWT capacitor, preventing WDO from going low. Once WDO is latched low, WDI must transition between low and high logic levels to clear WDO Transitions between open and logic low or logic high do not clear WDO. WDO: Watchdog Output. Logic output with weak 6μA pull- up to V2. May be pulled greater than V2 using external pull-up. For V2 configured to monitor 2.5V or below, connect an external pull-up resistor to the interface logic supply to ensure that the output high voltage is above the VIH of the external circuit. The watchdog timer is enabled when RST is high. The watchdog output pulls low if the watchdog timer expires and the output remains low until set high by the next WDI transition or anytime an undervoltage condition occurs. A watchdog failure also triggers a reset event. Leave open if unused. Exposed Pad (DE12 package only): The Exposed Pad may be left open or connected to device ground. will vary depending on parasitic capacitance on the pin. Tie CWT to GND to disable the watchdog function. GND: Device Ground. NC: No Internal Connection. RST: Reset Output. Logic output with weak 6μA pull-up to V2. Pulls low when any voltage input is below the reset threshold and held low for the configured reset delay time after all voltage inputs are above threshold. When the watchdog timer is enabled but not serviced prior to the configured watchdog timeout period, RST pulls low for one reset delay time. May be pulled to greater than V2 using an external pull-up. For V2 configured to monitor 2.5V or below, connect an external pull-up resistor to the interface logic supply to ensure that the output high voltage is above the VIH of the external circuit. Leave open if unused. V1: Voltage Input 1. Select from 5V or 3.3V. See the Ap- plications Information section for details. The greater of V1 or V2 is also VCC for the device. Bypass this input to ground with a 0.1μF (or greater) capacitor. V2: Voltage Input 2. Select from 3.3V, 2.5V, 1.8V, 1.5V or 1.2V. See the Applications Information section for details. The greater of V1, V2 is also VCC for the device. Bypass this input to ground with a 0.1μF (or greater) capacitor. All status outputs are weakly pulled up to V2. V3: Voltage Input 3. Select from 2.5V, 1.8V, 1.5V, 1.2V or ADJ. See the Applications Information section for details. Tie to V1 if unused. V4: Voltage Input 4. Select from 1.8V, 1.5V, 1.2V, ADJ or –ADJ. See the Applications Information section for details. Tie to V1 if unused and configured for positive voltage. V5: Adjustable Voltage Input 5 for LTC2939. High imped- ance comparator input with 0.5V typical threshold. Tie to V1 if unused. V6: Adjustable Voltage Input 6 for LTC2939. High imped- ance comparator input with 0.5V typical threshold. Tie to V1 if unused. |
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