參數(shù)資料
型號: CP2120-GM
廠商: Silicon Laboratories Inc
文件頁數(shù): 24/24頁
文件大小: 0K
描述: IC I/O EXPANDER I2C/SPI 8B 20QFN
產品培訓模塊: CP21xx USB Bridge
標準包裝: 91
接口: I²C,SPI
輸入/輸出數(shù): 8
中斷輸出:
頻率 - 時鐘: 400kHz
電源電壓: 3 V ~ 3.6 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-VFQFN 裸露焊盤
供應商設備封裝: 20-QFN(4x4)
包裝: 管件
產品目錄頁面: 627 (CN2011-ZH PDF)
其它名稱: 336-1324
CP2120
Rev. 0.4
9
5. SPI Slave Bus
The CP2120 provides a four-wire slave SPI interface. The CP2120's SPI Bus activates whenever the SPI Master
pulls the NSS pin low. The master can then clock data into the CP2120 through the Master-Out-Slave-In (MOSI)
pin and receive data from the CP2120 through the Master-In-Slave-Out (MISO) pin. The SPI Master provides the
SPI with a clock source. Figure 2 shows typical connections for an SPI bus.
Figure 2. SPI Bus Typical Connections
SCLK should be held high when idle. Figure 3 shows a CP2120 data transfer on the SPI Bus. If the CP2120 is the
only slave device on the SPI bus, the NSS pin can be tied low.
Figure 3. Slave Mode Data/Clock Timing
MISO
MOSI
SPICLK
CS
SCLK
CS
CP2120
SPI Master
MSB
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
SCK
MOSI
MISO
NSS
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