BQ32000 Datasheet, PDF (8/20 Pages) Texas Instruments – REAL-TIME CLOCK (RTC)

bq32000
SLUS900B – DECEMBER 2008 – REVISED JUNE 2009................................................................................................................................................... www.ti.com
t_icf
t_icr
t_sdh
t_vd
0.7 V_CC
SDA
0.3 V_CC
Start Condition
t_icf
0.7 V_CC
SCL
0.3 V_CC
t_icr
1
t_sds
2
t_sch
3
4
t
sth
t_scl
1/f_scl
0.7 V_CC
SDA
0.3 V_CC
0.7 V_CC
SCL
0.3 V_CC
Stop Condition
t_vd
t_buf
D7/A
t_sds
8
9
t_sps
Figure 4. I²C Timing Diagram
Start Condition
PARAMETER
f_scl
t_sch
t_scl
t_sp
t_sds
t_sdh
t_icr
t_icf
t_ocf
t_buf
t_sts
t_sth
t_sps
t_{vd (data)}
t_{vd (ack)}
I²C clock frequency
I²C clock high time
I²C clock low time
I²C spike time
I²C serial data setup time
I²C serial data hold time
I²C input rise time
I²C input fall time
I²C output fall time
I²C bus free time
I²C Start setup time
I²C Start hold time
I²C Stop setup time
Valid data time (SCL low to SDA valid)
Valid data time of ACK
(ACK signal from SCL low to SDA low)
(1) C_b = total capacitance of one bus line in pF
Table 2. I²C Timing
STANDARD MODE
MIN TYP MAX
0
100
4
4.7
0
50
250
0
1000
300
300
4.7
4.7
4
4
1
1
FAST MODE
MIN TYP
0
0.6
1.3
0
100
0
20 + 0.1C_b(1)
20 + 0.1C_b(1)
20 + 0.1C_b(1)
1.3
0.6
0.6
0.6
MAX
400
50
300
300
300
1
UNIT
kHz
µs
µs
ns
ns
ns
ns
ns
µs
µs
µs
µs
µs
µs
1 µs
8
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