KX022-1020 Datasheet, PDF (24/75 Pages) List of Unclassifed Manufacturers – Accelerometer Specifications

± 2g / 4g / 8g Tri-axis Digital
Accelerometer Specifications
PART NUMBER:
KX022-1020
Rev. 11.0
10-Sep-15
SPI Communications
4-Wire SPI Interface
The KX022 also utilizes an integrated 4-Wire Serial Peripheral Interface (SPI) for digital communication. The
SPI interface is primarily used for synchronous serial communication between one Master device and one or
more Slave devices. The Master, typically a micro controller, provides the SPI clock signal (SCLK) and
determines the state of Chip Select (nCS). The KX022 always operates as a Slave device during standard
Master-Slave SPI operation.
4-wire SPI is a synchronous serial interface that uses two control and two data lines. With respect to the
Master, the Serial Clock output (SCLK), the Data Output (SDI or MOSI) and the Data Input (SDO or MISO) are
shared among the Slave devices. The Master generates an independent Chip Select (nCS) for each Slave
device that goes low at the start of transmission and goes back high at the end. The Slave Data Output (SDO)
line, remains in a high-impedance (hi-z) state when the device is not selected, so it does not interfere with any
active devices. This allows multiple Slave devices to share a master SPI port as shown in Figure 2 below.
Figure 2: 4-wire SPI Connections
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