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Original question:

BQ40Z50-R1: BQ40Z50-r1

BQ40Z50-R1: What's the sample time value of PRES?

Che yi Su
Expert 1695 points
Part Number: BQ40Z50-R1

Hi TI experts,
 
1. What's the sample time value of PRES? At TRM 5.2.1.1 System Present, PRES is sampled four times per second, but I don't know the sample time value. 250mS or less or more...?
2. If NR=0 and ignore rise & fall time. What's the max of time from PRES pull low to mos turn on?

  • 0
    TI__Mastermind 42535 points
    Hi Che yi,

    1. Unfortunately we don't provide that information. However an easy way to check for it is to see the pulse duration on the pin when a scope is attached to it.
    2. We suggest allowing 1s at a minimum for PRES pin to pull low. The action for system detection involves both fw and hw. Therefore we need to allow 1s for detection from fw.