KX022-1020 Datasheet, PDF (18/75 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
Digital Interface
The Kionix KX022 digital accelerometer has the ability to communicate via the I²C and SPI digital serial
interface protocols. This allows for easy system integration by eliminating analog-to-digital converter
requirements and by providing direct communication with system micro-controllers.
The serial interface terms and descriptions as indicated in Table 6 below will be observed throughout this
document.
Term
Transmitter
Receiver
Master
Slave
Description
The device that transmits data to the bus.
The device that receives data from the bus.
The device that initiates a transfer, generates clock signals, and terminates a transfer.
The device addressed by the Master.
Table 6: Serial Interface Terminologies
I²C Serial Interface
As previously mentioned, the KX022 has the ability to communicate on an I²C bus. I²C is primarily used for
synchronous serial communication between a Master device and one or more Slave devices. The Master,
typically a micro controller, provides the serial clock signal and addresses Slave devices on the bus. The
KX022 always operates as a Slave device during standard Master-Slave I²C operation.
I²C is a two-wire serial interface that contains a Serial Clock (SCL) line and a Serial Data (SDA) line. SCL is a
serial clock that is provided by the Master, but can be held low by any Slave device, putting the Master into a
wait condition. SDA is a bi-directional line used to transmit and receive data to and from the interface. Data is
transmitted MSB (Most Significant Bit) first in 8-bit per byte format, and the number of bytes transmitted per
transfer is unlimited. The I²C bus is considered free when both lines are high.
The I2C interface is compliant with high-speed mode, fast mode and standard mode I2C protocols.
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