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LP5521
SNVS441F – JANUARY 2007 – REVISED FEBRUAY 2013
<>Data from master [ ] Data from slave
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ack from slave
ack from slave
ack from slave
start
MSB Chip id LSB
w
ack
MSB Register Addr LSB
ack
MSB
Data
LSB
ack
stop
SCL
SDA
start
id = 011 0010b
w
ack
address = 02H
ack
address 02H data
ack
stop
Figure 32. Register Write Format
When a READ function is to be accomplished, a WRITE function must precede the READ function, as show in
the Read Cycle waveform
ack from slave
ack from slave
repeated start
ack from slave data from slave nack from master
start
MSB Chip id LSB
w
MSB Register Addr LSB
rs
MSB Chip Address LSB
r
MSB
Data
LSB
stop
SCL
SDA
start
id = 011 0010b
w ack
address = 00H
ack
rs
id = 011 0010b
r ack
address 00H data
nack stop
w = write (SDA = 0)
r = read (SDA = 1)
ack = acknowledge (SDA pulled down by either master or slave
rs = repeated start
id = 7-bit chip address
Figure 33. Register Read Format
26
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