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ADM2914-1ARQZ-RL7 Datasheet(PDF) 8 Page - Analog Devices |
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ADM2914-1ARQZ-RL7 Datasheet(HTML) 8 Page - Analog Devices |
8 / 16 page ADM2914 Rev. B | Page 8 of 16 THEORY OF OPERATION VOLTAGE SUPERVISION The ADM2914 supervises up to four voltage rails for overvol- tage and undervoltage 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 accuracy of ±1.5%. 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 ADM2914 2.5V 3.3V 5V SYSTEM PSU Figure 16. Typical Applications Diagram POLARITY CONFIGURATION The ADM2914 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 summa- rized in Table 5, the SEL pin is either connected to GND, VCC, or left unconnected. When an input is configured to monitor a positive voltage, using the three-resistor scheme 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 is still connected to the high-side tap and VLx is still 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 configured 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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