ADM12914-2ARQZ Analog Devices Inc, ADM12914-2ARQZ Datasheet
ADM12914-2ARQZ
Specifications of ADM12914-2ARQZ
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ADM12914-2ARQZ Summary of contents
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... SEL requires a resistor to be placed between the main supply rail and the V pin to limit the current flow into the greater than 10 mA. The ADM12914 uses the internal shunt regulator to regulate V CC maximum ratings. The ADM12914 is available in two models. The ADM12914-1 offers a latching overvoltage output that can be cleared by toggling the LATCH input pin ...
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... Initial Version Voltage Monitoring Example .................................................... 11 Power-Up and Power-Down ..................................................... Timing Characteristics ............................................... 12 Timer Capacitor Selection ........................................................ 12 UV and OV Rise and Fall Times .............................................. OUTPUT Characteristics ........................................... 13 Glitch Immunity ......................................................................... 13 Undervoltage Lockout (UVLO) ............................................... 13 Shunt Regulator .......................................................................... 13 OV Latch (ADM12914-1) ......................................................... 13 Disable (ADM12914-2) ............................................................. 14 Typical Applications ....................................................................... 15 Outline Dimensions ....................................................................... 16 Ordering Guide .......................................................................... 16 Rev Page ...
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... TIMER(DOWN) V −180 −270 TIMER(DIS 0 0.8 0 SEL I SEL(MAX) pin has an internal 6.5 V shunt regulator and, therefore, a low impedance supply CC Rev Page ADM12914 Max Unit Test Conditions/Comments 6 150 SHUNT 0.9 V DIS = 0 V 2.06 V DIS = rising DIS = 0 V 100 μ ...
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... ADM12914 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 ADM12914-1 allows latched low. The ADM12914-2 holds OV low for an adjustable timeout period determined by the timer capacitor. This pin has a weak pull- and can be pulled externally ...
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... ADM12914 Pin No. ADM12914-1 ADM12914-2 Mnemonic 15 15 TIMER N/A means not applicable. Description Adjustable Reset Delay Timer. Connect an external capacitor to the TIMER pin to program the reset timeout delay. Refer to Figure 15 in the Typical Performance Characteristics section. Connect this pin bypass the timer. ...
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... Rev Page –40°C +25°C +85° (mA) CC Figure 7. V Shunt Voltage vs –40 –25 – TEMPERATURE (°C) Figure 8. Buffered Reference Voltage vs. Temperature RESET ASSERTED ABOVE THE LINE 2. COMPARATOR OVERDRIVE (% OF V UOT Figure 9. Transient Duration vs. Comparator Overdrive ADM12914 110 125 100 ) ...
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... ADM12914 –40 –25 – TEMPERATURE (°C) Figure 10 Timeout Period vs. Temperature 0.9 0.8 0.7 WITH 10kΩ PULL-UP 0.6 0.5 0.4 0.3 0.2 0.1 WITHOUT PULL-UP 0 –0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 SUPPLY VOLTAGE, V Figure 11. UV Output Voltage vs. V 5.0 VHx = 0.55V 4 ...
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... 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 ± ...
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... In this example, the threshold voltages, including the Rev Page and R are known calculated using the following − − change, each step must be recalculated ADM12914 REF VHx OVx R 0.5V Y UVx V NL VLx and V before using each in the previous Similar to the positive voltage NL ( connected to NH ...
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... V. The ADM12914 device with 0.1% resistors can achieve this level of accuracy. VOLTAGE 1.05V 2.4% RANGE FOR OV MONITORING 1.026V +2.6% SUPPLY REGULATION 1V CORE VOLTAGE –2.6% SUPPLY REGULATION 0.974V 2.4% RANGE FOR UV MONITORING 0.95V UV Figure 19. Monitoring Accuracy Example ...
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... TIMER pin. TIMER CAPACITOR SELECTION The UV and OV timeout period on the ADM12914 is program- mable via the external timer capacitor, C the TIMER pin and ground. The timeout period, t calculated using the following equation: ...
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... GLITCH IMMUNITY The ADM12914 is immune to short transients that may occur on the monitored voltage rails. The device contains internal filtering circuitry that provides immunity to fast transient glitches. Figure 9 illustrates glitch immunity performance by showing the maximum transient duration without causing a reset pulse ...
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... ADM12914 DISABLE (ADM12914-2) Pulling the DIS pin high disables both the UV and OV outputs, and forces both outputs to remain weakly pulled high, regard- less of any faults that are detected at the inputs UVLO condition is detected, the UV output is asserted and pulls low; however, the timeout function is bypassed. As soon as the UVLO condition clears, the UV output pulls high ...
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... VL1 VH2 ADM12914 83.5kΩ VL2 VH3 51.7kΩ VL3 VH4 12kΩ VL4 LATCH/DIS 1420kΩ REF GND −12 V with 3% Supply Tolerance and 15% Input Tolerance Requirement Rev Page SEL TIMER SYSTEM UV OV LATCH/DIS GND SEL TIMER SYSTEM UV OV ADM12914 ...
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... ADM12914-1ARQZ −40°C to +125°C ADM12914-1ARQZ-RL7 −40°C to +125°C ADM12914-2ARQZ −40°C to +125°C ADM12914-2ARQZ-RL7 −40°C to +125° RoHS Compliant Part. ©2009-2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 0.197 (5.00) ...