adm12914-2arqz-rl7 Analog Devices, Inc., adm12914-2arqz-rl7 Datasheet
adm12914-2arqz-rl7
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adm12914-2arqz-rl7 Summary of contents
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... V pin to limit the current flow into the greater than 10 mA. The ADM12914 uses the internal shunt regulator to regulate V CC absolute 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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... Timer Capacitor Selection ........................................................ 12 UV and OV Rise and Fall Time................................................ 12 UV/OV OUTPUT Characteristics........................................... 13 Glitch Immunity......................................................................... 13 Undervoltage Lockout (UVLO) ............................................... 13 Shunt Regulator .......................................................................... 13 OV Latch (ADM12914-1) ......................................................... 13 Disable (ADM12914-2) ............................................................. 13 Typical Applications ....................................................................... 14 Outline Dimensions ....................................................................... 15 Ordering Guide .......................................................................... 15 Rev. PrA | Page ...
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... 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. PrA | Page ADM12914 , SEL = V , DIS = open Max Unit Test Conditions/Comments 6 150 SHUNT 0.9 V DIS = ...
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... ADM12914 ABSOLUTE MAXIMUM RATINGS Table 2. Parameter 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. OV asserts 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 holdsOV low for a period determined by the TIMER capacitor. This pin has a weak pull- this pin unconnected when not in use ...
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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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... 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 (% Figure 9. Transient Duration vs. Comparator Overdrive ADM12914 110 125 100 ) ...
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... ADM12914 –40 –25 – TEMPERATURE (°C) Figure 10. UV/OV 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 4.5 SEL = V CC 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0 SUPPLY VOLTAGE, V Figure 12. UV Output Voltage vs. VCC ...
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... Preliminary Technical Data THEORY OF OPERATION VOLTAGE SUPERVISION The ADM12914 supervises up to four voltage rails for under- voltage 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 ...
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... R is calculated using the following − R − 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 ...
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... Preliminary Technical Data tolerances, must fit within a monitor region of just 0.024 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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... 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 ADM12914 is programmable via the external timer capacitor, C between the TIMER pin and ground. Calculate the timeout period, t ...
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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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... VH4 27.1kΩ 3.05kΩ VL4 45.3kΩ REF 1kΩ 1.98MΩ VH1 5.62kΩ 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. PrA | Page ...
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... REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ORDERING GUIDE Model Temperature Range 1 ADM12914-1ARQZ −40°C to +125°C 1 ADM12914-1ARQZ-RL7 −40°C to +125°C 1 ADM12914-2ARQZ −40°C to +125°C 1 ADM12914-2ARQZ-RL7 −40°C to +125° RoHS Compliant Part. 0.197 (5.00) 0.193 (4.90) 0.189 (4.80 0.158 (4.01) 0.154 (3.91) 0.244 (6.20) 0.150 (3.81) 1 ...
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... ADM12914 NOTES ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. PR08265-0-7/09(PrA) Preliminary Technical Data Rev. PrA | Page ...