BQ29312A Datasheet, PDF (6/35 Pages) Texas Instruments – TWO-CELL, THREE-CELL, AND FOUR-CELL LITHIUM-ION OR LITHIUM-POLYMER BATTERY PROTECTION AFE

bq29312A
SLUS629A – JANUARY 2005 – REVISED AUGUST 2005
AC ELECTRICAL CHARACTERISTICS
T_A = 25°C, C_(REG) = 4.7 µF, BAT = 14 V (unless otherwise noted)
PARAMETER
TEST CONDITION
t_(WDTINT) WDT start-up detect time
t_(WDWT) WDT detect time
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MIN NOM MAX UNIT
250 700 2000 ms
100
µs
AC TIMING SPECIFICATIONS (I²C COMPATIBLE SERIAL INTERFACE)
PARAMETER
MIN
t_r
SCLK SDATA rise time
t_f
SCLK SDAT fall time
t_w(H)
SCLK pulse width high
4.0
t_w(L)
SCLK pulse width low
4.7
t_su(STA)
Setup time for START condition
4.7
t_h(STA)
START condition hold time after which first clock pulse is generated
4.0
t_su(DAT)
Data setup time
250
t_h(DAT)
Data hold time
0
t_su(STOP)
Setup time for STOP condition
4.0
t_su(BUF)
Time the bus must be free before new transmission can start
4.7
t_V
Clock low to data out valid
t_h(CH)
Data out hold time after clock low
0
f_SCL
Clock frequency
0
MAX
1000
300
900
100
UNIT
ns
ns
µs
µs
µs
µs
ns
µs
µs
µs
ns
ns
kHz
t_su(STA)
SCLK
t_w(H)
SDATA
Start
Condition
t_h(STA)
SDA
Input
t_h(DAT)
t_w(L)
t_f
t_r
t_r
t_f
SDA
Change
t_su(DAT)
Stop
Condition
t_h(ch)
SCLK
SDATA
SCLK
SDATA
1
2
3
MSB
Start Condition
1
2
3
MSB
7
8
9
t_v
7
ACK
t_su(STOP)
8
9
ACK
Stop Condition
t_su(BUF)
6