ADM2914 Analog Devices, ADM2914 Datasheet
ADM2914
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ADM2914 Summary of contents
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... The ADM2914 is available in two models. The ADM2914-1 offers a latching overvoltage output that can be cleared by toggling the LATCH input pin. The ADM2914-2 has a disable pin that can override and disable both the OV and UV output signals. The ADM2914 is available in a 16-lead QSOP package. The device operates over the extended temperature range of − ...
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... Timer Capacitor Selection ........................................................ 11 UV and OV Rise and Fall Times .............................................. 12 Output Characteristics ............................................... 12 Glitch Immunity ......................................................................... 12 Undervoltage Lockout (UVLO) ............................................... 12 Shunt Regulator .......................................................................... 12 OV Latch (ADM2914-1) ........................................................... 13 Disable (ADM2914-2) ............................................................... 13 Typical Applications ....................................................................... 14 Outline Dimensions ....................................................................... 16 Ordering Guide .......................................................................... 16 Rev Page ...
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... REF UNDERVOLTAGE/OVERVOLTAGE CHARACTERISTICS Undervoltage/Overvoltage Threshold, V Undervoltage/Overvoltage Threshold to Output Delay, t VHx, VLx Input Current, I VHL UV/OV Timeout Period, t UOTO OV LATCH CLEAR INPUT (ADM2914-1) OV Latch Clear Threshold Input High, V LATCH (IH) OV Latch Clear Threshold Input Low, V LATCH (IL) LATCH Input Current, I LATCH DISABLE INPUT (ADM2914-2) ...
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... ADM2914 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter V CC UV, OV TIMER VLx, VHx, LATCH, DIS, SEL I CC Reference Load Current (I ) REF Storage Temperature Range Operating Temperature Range Lead Temperature (Soldering, 10 sec) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...
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... Overvoltage Reset Output asserted low if a negative polarity input voltage drops below its associated threshold positive polarity input voltage exceeds its threshold. The ADM2914-1 allows latched low. The ADM2914-2 holds OV low for an adjustable timeout period determined by the TIMER capacitor. This pin has a weak pull-up to VCC and can be pulled externally ...
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... ADM2914 TYPICAL PERFORMANCE CHARACTERISTICS 0.505 0.504 0.503 0.502 0.501 0.500 0.499 0.498 0.497 0.496 0.495 –40 –30 –20 – TEMPERATURE (°C) Figure 4. Input Threshold Voltage vs. Temperature 100 –40 – TEMPERATURE (°C) Figure 5. Supply Current vs. Temperature 6 ...
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... Figure 14 Voltage Output Low vs. Output Sink Current 10k 1k 100 0.1 Figure 15 Timeout Period vs. Capacitance Rev Page ADM2914 150mV UV = 50mV SUPPLY VOLTAGE, V (V) CC Figure 13 vs. V SINK CC UV +85°C +25°C – ...
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... Positive Connected to GND Negative 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 left unconnected. ...
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... ADM2914 REF VHx OVx R 0.5V Y UVx V NL VLx and V before using each in the previous equations Similar to the positive voltage NL NH pin, and the low-side voltage pin. Refer to the Voltage X ADM2914 (2) ( connected ...
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... UV Figure 19. Monitoring Threshold Accuracy Example VOLTAGE MONITORING EXAMPLE To illustrate how the ADM2914 device works in a real application, consider the 1 V input example shown in Figure 19, with the addition of a −12 V rail. The first step is to choose the nominal current flow through both voltage divider circuits, for example, 5 μ ...
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... The UV and OV outputs are held asserted after all faults have cleared for an adjustable timeout period, determined by the value of the external capacitor attached to the TIMER pin. TIMER CAPACITOR SELECTION The UV and OV timeout period on the ADM2914 is programma- ble via the external timer capacitor, C TIMER TIMER pin and ground. The timeout period, t using the following equation: 9 − ...
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... V. In this mode, the supply current of the device does not exceed 100 μA. An internal shunt regulator allows the ADM2914 to operate at voltage levels greater than simply placing a dropper resistor in series between the supply rail and the V pin to limit the input current to less than 10 mA ...
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... OV LATCH (ADM2914- overvoltage condition occurs when the LATCH pin is pulled low, the OV pin latches low. Pulling LATCH high clears the latch condition clears while LATCH is high, the latch is bypassed and the OV pin behaves in the same way as the UV pin, with an identical timeout period. If the LATCH pin is pulled low while the timeout period is active, the OV pin latches low normal operation ...
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... VL4 51.7kΩ REF 1 +12V 1kΩ 2 –5V 1.98MΩ VH1 5.62kΩ VL1 VH2 ADM2914 83.5kΩ VL2 VH3 1.96MΩ VL3 VH4 27.1kΩ VL4 167kΩ REF GND Figure 24. Typical Application Diagram for Monitoring +12 V and −5 V Rev Page ...
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... SUPPLY TOLERANCE AND 15% INPUT TOLERANCE REQUIREMENT SUPPLY TOLERANCE AND 15% INPUT TOLERANCE REQUIREMENT. Figure 25. Typical Application Diagram for Monitoring +48 V, +16 V, −3.3 V, and −48 V Rev Page VH1 SEL VL1 TIMER VH2 SYSTEM ADM2914 VL2 VH3 UV VL3 OV VH4 VL4 LATCH/DIS REF GND ADM2914 ...
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... ADM2914-1ARQZ −40°C to +125°C ADM2914-1ARQZ-RL7 −40°C to +125°C ADM2914-2ARQZ −40°C to +125°C ADM2914-2ARQZ-RL7 −40°C to +125°C EVAL-ADM2914EBZ RoHS Compliant Part. ©2009-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...