bq24735
SLUSAK9 –SEPTEMBER 2011
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ELECTRICAL CHARACTERISTICS (continued)
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
HOST COMMUNICATION FAILURE
ttimeout
tBOOT
SMBus bus release timeout(3)
25
10
35
ms
ms
s
Deglitch for watchdog reset signal
Watchdog timeout period, ChargeOption() bit [14:13] = 01(4)
Watchdog timeout period, ChargeOption() bit [14:13] = 10(4)
Watchdog timeout period, ChargeOption() bit [14:13] = 11(4) (Default)
35
44
88
53
105
210
tWDI
70
s
140
175
s
(3) 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).
(4) User can adjust threshold via SMBus ChargeOption() REG0x12.
Figure 4. SMBus Communication Timing Waveforms
10
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