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LM34902 Folha de dados(PDF) 5 Page - Texas Instruments |
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LM34902 Folha de dados(HTML) 5 Page - Texas Instruments |
5 / 11 page LM34902 www.ti.com SNVS804B – MAY 2012 – REVISED APRIL 2013 BLOCK DIAGRAM APPLICATION HINTS To turn on the PFET switch, both the ENABLE and the ACC_DET pins need to be asserted. In addition, ACC_DET needs to be asserted no later than the rising edge of the ENABLE signal. De-assertion of either the ENABLE or the ACC_DET will result in turned-off PFET switch and de-asserted POK signal. To prevent a glitch in the otherwise asserted ACC_DET from keeping the FETs turned off, it is a good practice to cycle the ENABLE following every falling edge in the ACC_DET signal. When cycling the ENABLE, make sure it stays low for at least T3 long before toggling back high. If ENABLE logic high level is not 1.8V, make sure ENABLE stays low for at least 1µs. When laying out the PCB, try to keep the ENABLE and ACC_DET traces as short as possible and away from noisy traces. Copyright © 2012–2013, Texas Instruments Incorporated Submit Documentation Feedback 5 Product Folder Links: LM34902 |
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