BQ27541 Datasheet, PDF (6/38 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541
SLUS861 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com
HDQ COMMUNICATION TIMING CHARACTERISTICS
T_A = –40°C to 85°C, C_REG = 0.47µF, 2.45 V < V_REGIN = V_BAT < 5.5 V; typical values at T_A = 25°C and V_REGIN = V_BAT = 3.6 V
(unless otherwise noted)
t_(CYCH)
t_(CYCD)
t_(HW1)
t_(DW1)
t_(HW0)
t_(DW0)
t_(RSPS)
t_(B)
t_(BR)
PARAMETER
Cycle time, host to bq27541
Cycle time, bq27541 to host
Host sends 1 to bq27541
bq27541 sends 1 to host
Host sends 0 to bq27541
bq27541 sends 0 to host
Response time, bq27541 to host
Break time
Break recovery time
TEST CONDITIONS
MIN TYP MAX UNIT
190
µs
190
205
250 µs
0.5
50 µs
32
50 µs
86
145 µs
80
145 µs
190
320 µs
190
µs
40
µs
t_(B)
t_(BR)
(a) Break and Break Recovery
t_(HW1)
t_(HW0)
t_(CYCH)
(b) Host Transmitted Bit
Break
7 - Bit Address
1-Bit
R/W
t_(DW1)
t_(DW0)
t_(CYCD)
(c) Gauge Transmit Bit
8 - Bit Data
t_(RSPS)
(d) Gauge to Host Response
Figure 1. Timing Diagrams for HDQ Breaking (a), HDQ Host to bq27541 communication (b), bq27541 to
Host communication (c), and bq27541 to Host response format (d).
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