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BQ24725ARGRR Datasheet(PDF) 10 Page - Texas Instruments |
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BQ24725ARGRR Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 47 page  bq24725A SLUSAL0A – SEPTEMBER 2011 – REVISED AUGUST 2014 www.ti.com 6.6 Timing Characteristics 4.5 V ≤ VVCC ≤ 24 V, 0°C ≤ TJ ≤ 125°C, typical values are at TA = 25°C, with respect to GND (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SMBus TIMING CHARACTERISTICS tR SCLK/SDATA rise time 1 μs tF SCLK/SDATA fall time 300 ns tW(H) SCLK pulse width high 4 50 μs tW(L) SCLK Pulse Width Low 4.7 μs tSU(STA) Setup time for START condition 4.7 μs tH(STA) START condition hold time after which first clock pulse is generated 4 μs tSU(DAT) Data setup time 250 ns tH(DAT) Data hold time 300 ns tSU(STOP) Setup time for STOP condition 4 µs t(BUF) Bus free time between START and STOP condition 4.7 μs FS(CL) Clock Frequency 10 100 kHz HOST COMMUNICATION FAILURE ttimeout SMBus bus release timeout(1) 25 35 ms tBOOT Deglitch for watchdog reset signal 10 ms Watchdog timeout period, ChargeOption() bit [14:13] = 01(2) 35 44 53 s tWDI Watchdog timeout period, ChargeOption() bit [14:13] = 10(2) 70 88 105 s Watchdog timeout period, ChargeOption() bit [14:13] = 11(2) (Default) 140 175 210 s (1) Devices participating in a transfer will timeout when any clock low exceeds the 25ms minimum timeout period. Devices that have detected a timeout condition must reset the communication no later than the 35ms maximum timeout period. Both a master and a slave must adhere to the maximum value specified as it incorporates the cumulative stretch limit for both a master (10ms) and a slave (25ms). (2) User can adjust threshold via SMBus ChargeOption() REG0x12. 6.7 Typical Characteristics , CH1: ILIM, 1V/div CH1: VCC, 10V/div, CH2: ACDET 2V/div, CH3: ACOK, 5V/div CH4: inductor current 1A/div, 20ms/div CH4: REGN, 5V/div, 40ms/div Figure 2. Charge Enable by ILIM Figure 1. VCC, ACDET, REGN and ACOK Power Up 10 Submit Documentation Feedback Copyright © 2011–2014, Texas Instruments Incorporated Product Folder Links: bq24725A |
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