BQ27741-G1_14 Datasheet, PDF (11/39 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge with Integrated Protection

bq27741-G1
www.ti.com
SLUSBF2 – JULY 2013
HDQ Communication Timing Characteristics
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)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
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
μs
μs
μs
μs
μs
μs
μs
μs
μs
s
ns
t(B)
t(BR)
(a) Break and Break Recovery
t(RISE)
1.2V
(b) HDQ line rise time
t(HW1)
t(HW0)
t(CYCH)
(c) Host Transmitted Bit
t(DW1)
t(DW0)
t(CYCD)
(d) Gauge Transmitted Bit
Break
7-bit address
1-bit
R/W
8-bit data
t(RSPS)
(e) Gauge to Host Response
(a) HDQ Breaking
(b) Rise time of HDQ line
(c) HDQ Host to fuel gauge communication
(d) Fuel gauge to Host communication
(e) Fuel gauge to Host response format
(f) HDQ Host to fuel gauge reset
t(RST)
(f) HDQ Reset
Figure 2. Timing Diagrams
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