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ADM12914-1ARQZ-RL7 Datenblatt(PDF) 9 Page - Analog Devices |
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ADM12914-1ARQZ-RL7 Datenblatt(HTML) 9 Page - Analog Devices |
9 / 16 page ADM12914 Rev. 0 | Page 9 of 16 THEORY OF OPERATION VOLTAGE SUPERVISION The ADM12914 supervises up to four voltage rails for under- voltage and overvoltage conditions. Two pins, VHx and VLx, are assigned to monitor each rail, one for overvoltage detection and the other for undervoltage detection. Each pin is connected to the input of an internal voltage comparator, and its voltage level is internally compared with a 0.5 V voltage reference with very high threshold accuracy of ±0.8%. The device is specified over the extended operating temperature range from −40°C to +125°C. The output of each of the internal undervoltage comparators is tied to a common UV output pin. Likewise, the outputs of the internal overvoltage comparators are tied to a common OV output pin. VH1 1.8V VL1 VH2 VL2 VH3 VL3 VH4 VL4 SEL TIMER UV OV LATCH/DIS REF GND VCC ADM12914 2.5V 3.3V 5V SYSTEM PSU Figure 16. Typical Applications Diagram POLARITY CONFIGURATION The ADM12914 is capable of monitoring supply voltages of both positive and negative polarities. The SEL pin is a three- state pin that determines the polarity of Input 3 and Input 4. As summarized in Table 5, the SEL pin is connected to either GND or VCC, or is not connected. When an input is configured to monitor a positive voltage, using the three resistor scheme that is shown in Figure 17, VHx is connected to the high-side tap of the resistor divider and VLx is connected to the low-side tap of the resistor divider. Conversely, when an input is configured to monitor a negative voltage, UVx and OVx are swapped internally. The negative voltage for monitoring is then connected as shown in Figure 18. VHx remains connected to the high-side tap and VLx remains connected to the low-side tap. Within this configuration, an undervoltage condition occurs when the monitored voltage is less negative than the programmed threshold, and an overvoltage condition occurs when the monitored voltage is more negative than the programmed threshold. Table 5. Polarity Configuration Input 3 Input 4 SEL Pin Polarity UV Condition OV Condition Polarity UV Condition OV Condition Connected to VCC Positive VH3 < 0.5 V VL3 > 0.5 V Positive VH4 < 0.5 V VL4 > 0.5 V Left Unconnected Positive VH3 < 0.5 V VL3 > 0.5 V Negative VL4 > 0.5 V VH4 < 0.5 V Connected to GND Negative VL3 > 0.5 V VH3 < 0.5 V Negative VL4 > 0.5 V VH4 < 0.5 V |
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