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X40034S14I-C Datasheet(PDF) 7 Page - Intersil Corporation |
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X40034S14I-C Datasheet(HTML) 7 Page - Intersil Corporation |
7 / 24 page 7 FN8114.1 May 25, 2006 returns and exceeds VTRIP2.This voltage sense cir- cuitry monitors the power supply connected to V2MON pin. If VCC = 0, V2MON can still be monitored. For the X40034 and X40035, the V2FAIL signal remains active until VCC drops below 1V and remains active until V2MON returns and exceeds VTRIP2.This sense circuitry is powered by VCC. If VCC = 0, V2MON cannot be monitored. Low Voltage V3 Monitoring The X40030, X40031, X40034, X40035 also monitors a third voltage level and asserts V3FAIL if the voltage falls below a preset minimum VTRIP3. The V3FAIL sig- nal is either ORed with RESET to prevent the micro- processor from operating in a power fail or brownout condition or used to interrupt the microprocessor with notification of an impending power failure. The V3FAIL signal remains active until the V3MON drops below 1V (V3MON falling). It also remains active until V3MON returns and exceeds VTRIP3. This voltage sense circuitry monitors the power supply connected to V3MON pin. If VCC = 0, V3MON can still be monitored. Early Low VCC Detection (LOWLINE) This CMOS output goes LOW earlier than RESET/RESET whenever VCC falls below the VTRIP1 voltage and returns high when VCC exceeds the VTRIP1 voltage. There is no power up delay circuitry (tPURST) on this pin. Figure 2. Two Uses of Multiple Voltage Monitoring Figure 3. VTRIPX Set/Reset Conditions 6-10V VCC 5V V2MON X40031-A Unreg. Supply VCC X40031-B RESET V2FAIL System VCC Reset RESET V2FAIL System Reset Notice: No external components required to monitor three voltages. 1M 390K V3MON V3FAIL V2MON 5V Reg 3.0V Reg 1.8V Reg 3.3V V3FAIL V3MON (1.7V) Power Fail Interrupt VCC VCC/V2MON/V3MON VTRIPX VP tWC A0h 0 7 70 7 0 SCL WDO SDA (X = 1, 2, 3) 00h X40030, X40031, X40034, X40035 |
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