LP5526 Datasheet, PDF (25/39 Pages) National Semiconductor (TI) – Lighting Management Unit with High Voltage Boost Converter with up to 150mA Serial FLASH LED Driver

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LP5526
SNVS431C – FEBRUARY 2006 – REVISED JULY 2009
ack from slave
ack from slave
ack from slave
start msb Chip Address lsb w ack msb Register Add lsb ack
msb DATA lsb
ack stop
SCL
SDA
start id = 59H = 101 1001b w ack
addr = 02H
ack
address 02H data
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, 59H (101 1001b) for LP5526.
Figure 16. I²C Write Cycle
ack stop
When a READ function is to be accomplished, a WRITE function must precede the READ function, as shown in the Read Cycle waveform.
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 = 59H = 101 1001b w ack
addr = 00H
ack rs id = 59H = 101 1001b r ack address 00H data ack stop
Figure 17. I²C Read Cycle
SDA
8
SCL
1
7
6
2
8
1
5
3
4
Figure 18. I²C Timing Diagram
10
7
9
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