参数资料
型号: ADP5588-EVALZ
厂商: Analog Devices Inc
文件页数: 6/28页
文件大小: 0K
描述: BOARD EVAL ADP5588 KEYPAD/GPIO
标准包装: 1
主要目的: 接口,GPIO 扩展器
嵌入式:
已用 IC / 零件: ADP5588
主要属性: 8 位 18 端口 GPIO 扩展器
次要属性: I²C 接口
已供物品:
ADP5588
Data Sheet
Rev. C | Page 14 of 28
I2C PROGRAMMING AND DIGITAL CONTROL
The ADP5588 provides full software programmability to
facilitate its adoption in various product architectures. All
register programming is done via the I2C bus at Address 0x69
(01101001) for a read and Address 0x68 (01101000) for a write.
All communication to the ADP5588 is done via its I2C-compatible
serial interface. Figure 14 shows a typical write sequence for
programming an internal register. The cycle begins with a start
condition followed by the chip write address (0x68). The
ADP5588 acknowledges the chip write address byte by pulling
the data line low. The address of the register to which data is to
be written is sent next. The ADP5588 acknowledges the register
address byte by pulling the data line low. The data byte to be
written is sent next. The ADP5588 acknowledges the data byte
by pulling the data line low. A stop condition completes the
sequence.
Figure 15 shows a typical read sequence for reading back an
internal register. The cycle begins with a start condition
followed by the chip write address (0x68). The ADP5588
acknowledges the chip write address byte by pulling the data
line low. The address of the register from which data is to be
read is sent next. The ADP5588 acknowledges the register
address byte by pulling the data line low. The cycle continues
with a repeat start followed by the chip read address (0x69). The
ADP5588 acknowledges the chip read address byte by pulling
the data line low. The ADP5588 places the contents of the
previously addressed register on the bus for readback. There is
no acknowledge following the readback data byte, and the cycle
is completed with a stop condition.
SUBADDRESS
CHIP ADDRESS
ST
0
1
0
SP
0 = WRITE
ADP
5588
ACK
ADP
5588
ACK
ADP5588 RECEIVES DATA
ADP
5588
ACK
07673-
019
0
Figure 14. I2C Write Sequence
SUBADDRESS
CHIP ADDRESS
ST
0
1
0
1
0
ST
0
1
0
1
SP
1 = READ
ADP
5588
NO
ACK
ADP5588 SENDS DATA
ADP
5588
ACK
ADP
5588
ACK
ADP
5588
ACK
07673-
020
0 = WRITE
0
1
Figure 15. I2C Read and Write Sequences
READ START ADDR
CHIP ADDRESS
ST 0
1
0
1
0
1
0
ST 0
1
0
1
0
1 = READ
ADP
5
8
ACK
ADP5588 SENDS DATA 1
ADP
5
8
ACK
ADP
5
8
ACK
ADP
5
8
ACK
07673-
021
0 = WRITE
0
1
ADP
5
8
NO
ACK
1
ADP5588 SENDS DATA N
...
ST
O
P
S
T
ART
Figure 16. I2C Read Autoincrement
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