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| BQ24745_14 Datasheet, PDF (9/39 Pages) Texas Instruments – SMBus-Controlled Multi-Chemistry Battery | |||
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bq24745
SLUS761D â DECEMBER 2007 â REVISED OCTOBER 2011
ELECTRICAL CHARACTERISTICS (continued)
7 V ⤠VDCIN ⤠24 V, 0°C < TJ < 125°C, typical values are at TA = 25°C, with respect to AGND (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX UNIT
IVDDSMB_Iq VDDSMB quiescent current
VVDDSMB = SCL = SDA = 5.5 V, 0°C ⤠TJ â¤
85°C
20
27 μA
ELECTRICAL CHARACTERISTICS
7 Vdc ⤠V(VCC) ⤠24 Vdc, â20°C<TJ <125°C, ref = AGND (unless otherwise noted)(1)
PARAMETER
[SMB TIMING SPECIFICATION (VDD = 2.7 V to 5.5 V) (see Figures 4 and 5)]
MIN TYP MAX UNIT
SMBus TIMING CHARACTERISTICS
tR
SCLK/SDATA rise time
tF
SCLK/SDATA fall time
tW(H)
SCLK pulse duration high
tW(L)
SCLK pulse duration low
tSU(STA)
Setup time for START condition
tH(STA)
START condition hold time after which first clock pulse is generated
tSU(DAT)
Data setup time
tH(DAT)
Data hold time
tSU(STOP) Setup time for STOP condition
t(BUF)
Bus free time between START and STOP condition
FS(CL)
Clock frequency
HOST COMMUNICATION FAILURE
1 μs
300 ns
4
50 μs
4.7
μs
4.7
μs
4
μs
250
ns
300
ns
4
μs
4.7
μs
10
100 kHz
ttimeout
SMBus bus release timeout
tWDI
Watchdog timeout period
OUTPUT BUFFER CHARACTERISTICS
22 25 35 ms
140 170 210
s
V(SDAL)
Output LO voltage at SDA, I(SDA) = 3 mA
0.4 V
(1) Devices participating in a transfer time out when any clock low exceeds the 2- ms minimum time-out period. Devices that have detected
a time-out condition must reset the communication no later than the 35-ms 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 (10 ms) and a slave (25 ms).
Copyright © 2007â2011, Texas Instruments Incorporated
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