Datasheet

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