LP3950 Datasheet, PDF (12/38 Pages) National Semiconductor (TI) – Color LED Driver with Audio Synchronizer

LP3950
SNVS331C – NOVEMBER 2004 – REVISED APRIL 2013
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When a READ function is to be accomplished, a WRITE function must precede the READ function, as shown in
Figure 10 .
ack from slave
ack from slave repeated start
ack from slave data from slave ack from master
start msb Chip Address lsb w
msb Register Add lsb
rs msb Chip Address lsb r
msb DATA lsb
stop
SCL
SDA
start
Id = 36h
w ack
addr = K¶00
ack rs
Id = 36h
Figure 10. I²C Read Cycle
r ack $GGUHVV K¶00 data ack stop
SDA
8
SCL
1
7
6
2
8
1
5
3
4
Figure 11. I²C Timing Diagram
10
7
9
Table 2. I²C Timing Parameters⁽¹⁾
Symbol
Parameter
1
Hold Time (repeated) START Condition
2
Clock Low Time (1.65V ≤ V_DDIO < 1.80V)
2
Clock Low Time (1.80V ≤ V_DDIO ≤ V_DD1,2V)
3
Clock High Time (1.65V ≤ V_DDIO < 1.80V)
3
Clock High Time (1.80V ≤ V_DDIO ≤ V_DD1,2V)
4
Setup Time for a Repeated START Condition
5
Data Hold Time (data output, delay generated by LP3950)
5
Data Hold Time (data input)
6
Data Setup Time
7
Rise Time of SDA and SCL
8
Fall Time of SDA and SCL
9
Set-up Time for STOP condition
10
Bus Free Time between a STOP and a START Condition
C_b
Capacitive Load Parameter for Each Bus Line.
Load of One Picofarad Corresponds to One Nanosecond.
Limit
Min
Max
0.6
3.2
1.3
1200
600
600
300
900
0
900
100
20+0.1C_b
300
15+0.1C_b
300
600
1.3
10
200
(1) Data guaranteed by design
Units
µs
µs
µs
ns
ns
ns
ns
ns
ns
ns
ns
ns
µs
ns
12
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