BQ27541-V200_1007 Datasheet, PDF (6/43 Pages) Texas Instruments – Single Cell Li-Ion Battery Fuel Gauge for Battery Pack Integration

bq27541-V200
SLUSA11 – FEBRUARY 2010
www.ti.com
HDQ COMMUNICATION TIMING CHARACTERISTICS
T_A = –40°C to 85°C, C_REG = 0.47mF, 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)
PARAMETER
TEST CONDITIONS
MIN TYP MAX UNIT
t_(CYCH)
t_(CYCD)
t_(HW1)
t_(DW1)
t_(HW0)
t_(DW0)
t_(RSPS)
t_(B)
t_(BR)
t_(RISE)
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
HDQ line resing time to logic 1 (1.2V)
190
ms
190
205
250 ms
0.5
50 ms
32
50 ms
86
145 ms
80
145 ms
190
320 ms
190
ms
40
ms
950 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
Figure 1. Timing Diagrams
6
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