参数资料
| 型号： | PCA9655EDTR2G |
| 厂商： | ON Semiconductor |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C 16B 24-TSSOP |
| 标准包装： | 1 |
| 接口： | I²C 总线，SM 总线 |
| 输入/输出数： | 16 |
| 中断输出： | 是 |
| 频率 - 时钟： | 100kHz |
| 电源电压： | 1.65 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 标准包装 |
| 其它名称： | PCA9655EDTR2GOSDKR |
PCA9655E
http://onsemi.com
11
BUS TRANSACTIONS
Writing to the Port Registers
To transmit data to the PCA9655E, the bus master must
first send the device address with the least significant bit set
to logic 0 (see Figure 5 “PCA9655E device address”). The
command byte is sent after the address and determines
which registers will receive the data following the command
byte.
There are eight registers within the PCA9655E. These
registers are configured to operate as four register pairs:
Input Ports, Output Ports, Polarity Inversion Ports, and
Configuration Ports. Data bytes are sent alternately to each
if one byte is sent to Output Port 1 (register 3), then the next
byte will be stored in Output Port 0 (register 2). There is no
limitation on the number of data bytes sent in one write
transmission. In this way, each 8bit register may be updated
independently of the other registers.
Figure 6. Write to Output Port Registers
A2 A1 A0 0 A
S A6
START condition
R/W acknowledge
from slave
A
SCL
SDA
A
write to port
data out
from port 0
P
tv(Q)
9
8
7
6
5
4
3
2
1
command byte
data to port 0
DATA 0
slave address
0
STOP
condition
0.0
0.7
acknowledge
from slave
acknowledge
from slave
data to port 1
DATA 1
1.0
1.7
A
data out
from port 1
tv(Q)
DATA VALID
A5 A4 A3
0 0 0 0 0 1 0
Figure 7. Write to Configuration Registers
A2 A1 A0 0 A
S A6
START condition
R/W acknowledge
from slave
A
SCL
SDA
AP
9
8
7
6
5
4
3
2
1
command byte
data to register
DATA 0
slave address
0
STOP
condition
LSB
MSB
acknowledge
from slave
acknowledge
from slave
data to register
DATA 1
LSB
MSB
A
A5 A4 A3
0 0 0
1 1 0
0
Reading the Port Registers
To read data from the PCA9655E, the bus master must
first send the PCA9655E address with the least significant
bit set to logic 0 (see Figure 5 “PCA9655E device address”).
The command byte is sent after the address and determines
which register will be accessed.
After a restart, the device address must be sent again, but
this time, the least significant bit is set to logic 1. Data from
the register defined by the command byte will then be sent
into the register on the falling edge of the acknowledge clock
pulse. After the first byte is read, additional bytes may be
read but with data alternately coming from each register in
the pair. For example, if you read Input Port 1, then the next
byte read would be Input Port 0. There is no limitation on the
number of data bytes received in one read transmission but
the bus master must not acknowledge the data for the final
byte received.
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