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| 型号： | CP2120-GM |
| 厂商： | Silicon Laboratories Inc |
| 文件页数： | 2/24页 |
| 文件大小： | 0K |
| 描述： | IC I/O EXPANDER I2C/SPI 8B 20QFN |
| 产品培训模块： | CP21xx USB Bridge |
| 标准包装： | 91 |
| 接口： | I²C，SPI |
| 输入/输出数： | 8 |
| 中断输出： | 是 |
| 频率 - 时钟： | 400kHz |
| 电源电压： | 3 V ~ 3.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-VFQFN 裸露焊盘 |
| 供应商设备封装： | 20-QFN（4x4） |
| 包装： | 管件 |
| 产品目录页面： | 627 (CN2011-ZH PDF) |
| 其它名称： | 336-1324 |
CP2120
10
Rev. 0.4
5.1. Command Set
An SPI Master controls the CP2120 by sending commands across the SPI bus. Some commands initiate I2C
transactions, while other commands modify or monitor CP2120 operation and events.
5.2. Internal Registers
The CP2120 maintains a set of internal registers that can be modified to configure general purpose port I/O and I2C
operation and can be read to obtain device status. Commands reading to and writing from the internal registers can
be issued at any time, even while an I2C transaction is in progress, as they do not initiate any I2C bus transactions.
Table 3 shows a list of all internal registers.
5.2.1. Write to Internal Register
A Write to Internal Register command updates the value of one of the CP2120's Internal Registers. A Write to
Internal Register command begins with the command byte, 0x20, followed by the internal register address,
followed by the new value of the internal register. Only one register can be accessed per Write to Internal Register
command.
Table 3. Internal Register Addresses
Internal Register
Address
Section
IOCONFIG
0x00
7.
IOSTATE
0x01
7.
I2CCLOCK
0x02
6.1
I2CTO
0x03
6.1
I2CSTAT
0x04
6.2
I2CADR
0x05
6.1
RXBUFF
0x06
6.3
IOCONFIG2
0x07
7.
EDGEINT
0x08
7.
I2CTO2
0x09
6.1
0x20
COMMAND
REGISTER
X
DATA BYTE
SPI Master
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