Datasheet

I
2
C COMPATIBLE INTERFACE
t
su(STA)
t
h(STA)
t
w(H)
t
w(L)
t
su(STOP)
t
f
t
f
t
r
t
su(DAT)
t
h(DAT)
t
r
SDA Change
SDA Input
SCLK
SCLK
SDATA
SDATA
SDATA
MSB
1 2 3
7 8 9
ACK
t
v
SCLK
MSB
1
2 3 7 8 9
ACK
StopCondition
StartCondition
StartCondition
T0369-01
StopCondition
t
h(ch)
t
su(BUF)
bq77PL900
SLUS844B – JUNE 2008 – REVISED JANUARY 2009 ...................................................................................................................................................... www.ti.com
BAT = PACK = 7 V to 50 V, T
A
= – 25 ° C to 85 ° C, typical values stated where T
A
= 25 ° C and BAT = PACK = 36 V (unless
otherwise noted)
PARAMETER MIN MAX UNIT
t
r
SCLK, SDATA rise time 1000 ns
t
f
SCLK, SDATA fall time 300 ns
t
w(H)
SCLK pulse duration high 4 µ s
t
w(L)
SCLK pulse duration low 4.7 µ s
t
su(STA)
Setup time for START condition 4.7 µ s
t
h(STA)
START condition hold time after which first clock pulse is generated 4 µ s
t
su(DAT)
Data setup time 250 ns
t
h(DAT)
Data hold time 0 µ s
t
su(STOP)
Setup time for STOP condition 4 µ s
t
su(BUF)
Time the bus must be free before new transmission can start 4.7 µ s
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
Figure 5. I
2
C-Like I/F Timing Chart
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