BQ27742-G1 Datasheet, PDF (12/46 Pages) Texas Instruments – Single-Cell Li-Ion Battery Fuel Gauge with Programmable Hardware Protection

bq27742-G1
SLUSBV9C – MARCH 2014 – REVISED FEBRUARY 2016
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6.21 Timing Requirements
T_A = –40°C to 85°C, 2.4 V < V_REG25 < 2.6 V; typical values at T_A = 25°C and V_REG25 = 2.5 V (unless otherwise noted)
MIN
NOM
MAX
I²C-Compatible Interface Timing Characteristics (see Figure 1)
t_R
SCL or SDA rise time
t_F
SCL or SDA fall time
t_w(H)
SCL pulse width (high)
t_w(L)
SCL pulse width (low)
t_su(STA)
Setup for repeated start
t_d(STA)
Start to first falling edge of SCL
t_su(DAT)
Data setup time
t_h(DAT)
Data hold time
t_su(STOP)
Setup time for stop
t_BUF
Bus free time between stop and start
f_SCL
Clock frequency
HDQ Communication Timing Characteristics (see Figure 2)
300
300
600
1.3
600
600
100
0
600
66
400
t_(CYCH)
t_(CYCD)
t_(HW1)
t_(DW1)
t_(HW0)
t_(DW0)
t_(RSPS)
t_(B)
t_(BR)
t_(RST)
t_(RISE)
Cycle time, host to fuel gauge
Cycle time, fuel gauge to host
Host sends 1 to fuel gauge
Fuel gauge sends 1 to host
Host sends 0 to fuel gauge
Fuel gauge sends 0 to host
Response time, fuel gauge to host
Break time
Break recovery time
HDQ reset
HDQ line rise time to logic 1 (1.2 V)
190
190
205
250
0.5
50
32
50
86
145
80
145
190
950
190
40
1.8
2.2
950
UNIT
ns
ns
ns
μs
ns
ns
ns
ns
ns
μs
kHz
μs
μs
μs
μs
μs
μs
μs
μs
μs
s
ns
t_SU(STA)
t_w(H)
t_w(L)
t_f
t_r
t_(BUF)
SCL
SDA
t_d(STA)
t_f
t_r
t_h(DAT)
t_su(DAT)
t_su(STOP)
REPEATED
START
STOP
START
Figure 1. I²C-Compatible Interface Timing Diagrams
12
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