How to Use KX134: Examples, Pinouts, and Specs

The KX134 is a high-performance, low-power 3-axis accelerometer designed by Kionix, a subsidiary of ROHM Semiconductor. This sensor is capable of measuring acceleration with a full-scale range of ±8g, ±16g, ±32g, and ±64g. It is commonly used in applications such as motion detection, vibration monitoring, and dynamic orientation detection in devices like smartphones, gaming controllers, and vehicle navigation systems.

• Sensing Range: ±8g, ±16g, ±32g, ±64g (selectable)
• Output: Digital (I2C/SPI)
• Voltage Supply: 1.7V to 3.6V
• Current Consumption: 0.9µA (standby), 145µA (operating at low power)
• Interface: I2C (up to 3.4MHz), SPI (up to 10MHz)
• Operating Temperature: -40°C to +85°C

1. Power Supply: Connect VDD to a 1.7V to 3.6V source and GND to the system ground.
2. Data Interface: For I2C communication, connect SCL to the I2C clock line and SDA to the I2C data line. For SPI, connect SCL/SPC to the SPI clock, SDA/SDI to the SPI data input, and SDO to the SPI data output if needed.
3. Chip Select: For SPI, the CS pin must be connected to a digital output pin on the microcontroller and driven low to initiate communication.
4. Interrupts: INT1 and INT2 can be connected to digital input pins on the microcontroller if interrupt-driven operation is required.

• Ensure that the power supply is stable and within the specified voltage range.
• Use pull-up resistors on the I2C lines if they are not already provided in the microcontroller.
• Keep the communication lines as short as possible to reduce noise and interference.
• Configure the sensor settings such as range and bandwidth according to the application requirements.

#include <Wire.h>

// KX134 I2C address (assuming SDO pin is connected to GND)
const int KX134_I2C_ADDRESS = 0x1E;

void setup() {
  Wire.begin(); // Initialize I2C
  Serial.begin(9600); // Start serial communication at 9600 baud rate

  // Setup KX134 (write appropriate configuration registers)
  // This is a placeholder for actual configuration code
}

void loop() {
  // Read acceleration data from KX134
  // This is a placeholder for actual data reading code

  // Process and output the acceleration data
  // This is a placeholder for actual data processing and output
}

Note: The above code is a template and does not include specific register addresses or data processing. Users must refer to the KX134 datasheet for detailed register descriptions and configure the device accordingly.

• No Data Output: Ensure that the power supply is within range and that the I2C/SPI lines are correctly connected.
• Inaccurate Readings: Verify that the accelerometer range is correctly set for your application. Also, check for any sources of electromagnetic interference.

• Power Supply Issues: Use a decoupling capacitor close to the VDD pin to filter out noise.
• Communication Errors: Check for proper pull-up resistors on the I2C lines and ensure that the SPI lines are not too long or susceptible to crosstalk.

Q: Can the KX134 operate in both I2C and SPI modes? A: Yes, the KX134 can operate in either I2C or SPI mode, but the mode must be selected correctly through the pin connections and configuration settings.

Q: What is the purpose of the INT1 and INT2 pins? A: These pins can be configured to output interrupt signals for various events such as motion detection, free-fall, or data ready notifications.

Q: How do I change the sensing range of the KX134? A: The sensing range can be changed by writing to the appropriate configuration registers. Refer to the datasheet for the specific register settings.

Q: Is the KX134 suitable for battery-powered applications? A: Yes, with its low-power consumption in standby and operating modes, the KX134 is suitable for battery-powered applications.

For more detailed information, please refer to the KX134 datasheet provided by Kionix.