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LTC2902-1IGN Datasheet(PDF) 8 Page - Linear Technology |
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LTC2902-1IGN Datasheet(HTML) 8 Page - Linear Technology |
8 / 16 page 8 LTC2902 2902f PI FU CTIO S RST (Pin 6): Reset Logic Output. Active low with weak pull-up to V2 (LTC2902-1) or active pull-up to V2 (LTC2902-2). Pulls low when any voltage input is below the reset threshold and held low for programmed delay time after all voltage inputs are above threshold. May be pulled above V2 using an external pull-up (LTC2902-1 only). T0 (Pin 7): Digital Input for Supply Tolerance Selection (5%, 7.5%, 10% or 12.5%). Used in conjunction with T1 (Pin 9). See Applications Information for tolerance selec- tion chart (Table 4). RDIS (Pin 8): Digital Input for RST Disable. A low input on this pin forces the RST output to V2 (or pull-up voltage). Useful for determining supply margins without issuing reset command to processor. A weak internal pull-up allows pin to be left floating for normal monitor operation. T1 (Pin 9): Digital Input for Supply Tolerance Selection (5%, 7.5%, 10% or 12.5%). Used in conjunction with T0 (Pin 7). See Applications Information for tolerance selec- tion chart (Table 4). GND (Pin 10): Ground. VPG (Pin 11): Voltage Threshold Combination Select Input. Connect to an external 1% resistive divider be- tween VREF and GND to select 1 of 16 combinations of preset and/or ±adjustablevoltagethresholds(seeTable 1). Do not add capacitance on the VPG pin. VREF (Pin 12): Buffered Reference Voltage. A 1.210V nominal reference used for programming 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. V4 (Pin 13): Voltage Input 4. Select from 1.8V, 1.5V, ADJ or – ADJ. See Table 1 for details. V2 (Pin 14): Voltage Input 2. Select from 3.3V, 3V or 2.5V. See Table 1 for details. The greater of (V1, V2) is also VCC for chip. Bypass this pin to ground with a 0.1 µF(orgreater) capacitor. All logic outputs (COMP1, COMP2, COMP3, COMP4) are weakly pulled up to V2. RST is weakly pulled up to V2 in the LTC2902-1 and RST is actively pulled up to V2 in the LTC2902-2. COMP4 (Pin 15): Comparator Output 4. Nondelayed, active high logic output with weak pull-up to V2. Pulls high when V4 is above reset threshold. May be pulled greater than V2 using external pull-up. COMP2 (Pin 16): Comparator Output 2. Nondelayed, active high logic output with weak pull-up to V2. Pulls high when V2 is above reset threshold. May be pulled greater than V2 using external pull-up. |
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