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MP6400DG-09 Datasheet(PDF) 6 Page - Monolithic Power Systems |
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MP6400DG-09 Datasheet(HTML) 6 Page - Monolithic Power Systems |
6 / 12 page MP6400 -- LOW QUIESCENT CURRENT PROGRAMMABLE-DELAY SUPERVISORY CIRCUIT MP6400 Rev. 1.0 www.MonolithicPower.com 6 9/7/2012 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited. © 2012 MPS. All Rights Reserved. TM PIN FUNCTIONS QFN Pin # TSOT Pin # Name Description 6 1 R E S E T R E S E T is an open drain signal which will be asserted when the SENSE voltage drops below a preset threshold or when the manual reset ( M R ) pin drops to a logic low. The R E S E T delay time is programmable from 2.1ms to 10s by using external capacitors. A pull-up resistor bigger than 10k should be connected this pin to supply line, and the R E S E T outputting a higher voltage than VCC is allowable. 5 2 GND Ground. 4 3 M R The manual reset ( M R ) can introduce another logic signal to control the R E S E T . It is internally connected to VCC through a 90kΩ resistor. 3 4 CDELAY Programmable reset delay time pin. When CDELAY connected to VCC through a resistor between 50kΩ and 200kΩ, a 380ms delay time is selected. When CDELAY floated, the delay time is 24ms. A capacitor bigger than 150pF connected CDELAY to GND could be used to get the user’s programmable time from 2.1ms to 10s. 2 5 SENSE SENSE pin is connected to the monitored system voltage. When the monitored voltage is below desired threshold, R E S E T is asserted. 1 6 VCC Supply voltage. A 0.1uF decoupling ceramic capacitor should be put close to this pin. DETAIL DESCRIPTION The MP6400 product family asserts a R E S E T signal when either the SENSE pin voltage is lower than VIT or the manual reset ( M R ) is driven low. The MP6400 family can be monitored a fixed voltage from 0.9V to 5.0V, while the MP6400DG(J)-01 can monitor any voltage above 0.4V by adjusting the external resistor divider. After both the manual reset ( M R ) and SENSE voltages exceed their thresholds, the R E S E T output remains asserted for a user’s programmable delay time. Two fixed R E S E T delay times are user-selectable: 380ms delay time by connecting the CDELAY pin to VCC, and 24ms delay time by leaving the CDELAY pin float. Any delay time from 2.1ms to 10s could be gotten by connecting a capacitor between CDELAY and GND. The wide monitor voltage and programmable reset delay time make MP6400 product family suitable for a broad array of applications. |
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