BQ27000 Datasheet, PDF (4/29 Pages) Texas Instruments – SINGLE CELL Li-Ion AND Li-Pol BATTERY GAS GAUGE IC FOR PORTABLE APPLICATIONS (bqJUNIOR)

bq27000, bq27200
SLUS556B – SEPTEMBER 2004 – REVISED NOVEMBER 2004
PARAMETER
TEST CONDITIONS
STANDARD HDQ SERIAL COMMUNICATION TIMING (bq27000 only)
t_(B)
Break timing
t_(BR)
Break recovery
t_(CYCH)
Host bit window
t_(HW1)
Host sends 1
t_(HW0)
Host sends 0
t_(RSPS)
bqJUNIOR to host response
t_(CYCD)
bqJUNIOR bit window
t_(DW1)
bqJUNIOR sends 1
t_(DW0)
bqJUNIOR sends 0
STANDARD I²C SERIAL COMMUNICATION TIMING (bq27200 only)
t_r
t_f
t_w(H)
t_w(L)
t_su(STA)
t_d(STA)
t_su(DAT)
t_h(DAT)
t_su(STOP)
t_(BUF)
f_(SCL)
t_(BUSERR)
SCL/SDA rise time
SCL/SDA fall time
SCL pulse width (high)
SCL pulse width (low)
Setup for repeated start
Start to first falling edge of SCL
Data setup time
Data hold time
Setup time for stop
Bus free time between stop and start
Clock frequency
Bus error timeout
TIMING DIAGRAMS
www.ti.com
MIN
TYP
MAX UNIT
190
40
190
0.5
50
86
145 µs
190
320
190
250
32
50
80
145
1
300
4
4.7
4.7
µs
4
250
300
4
4.7
100 kHz
14.5
18.8 s
t_(B)
(a) Break and Break Recovery
t_(BR)
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) bqJUNIOR Transmitted Bit
8−Bit Data
t_(RSPS)
(d) bqJUNIOR to Host Response
Figure 1. HDQ Bit Timing Diagram
UDG−03039
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