2023-09-11

Hardware Introduction

This section demonstrates how to debug an accelerometer sensor based on LTE OPEN-EVB_V1.1, EC600U TE-A EVB, and LIS2DH12TR sensor.

The LIS2DH12TR sensor is a high-performance 3-axis linear accelerometer sensor with digital I2C and SPI serial interface standard output. The sensor has ultra-low power consumption mode, which can achieve features such as advanced power saving, smart, sleep wake-up and sleep recovery. The LIS2DH12TR has a dynamic user-selectable full-scale range of ±2 g/±4 g/±8 g/±16 g and can measure acceleration with output data rates ranging from 1 Hz to 5 kHz. The device can be configured to generate interrupt signals through independent inertial wake-up/free-fall events and the device's position. The threshold and timing of the interrupt generator can be dynamically set by the end user.

Package Specification

LIS2DH12TR sensor package specifications:

media_i2c_lis2dh_1

Hardware Connection

Pin function introduction:

Pin Number Pin Name Description
1 SCL
SPC		 I2C/SPI clock pin.
2 CS SPI enablement pin, used to control the chip communication mode.
1: I2C communication; 2: SPI communication.
3 SDO
SA0		 Data output pin in SPI mode;
Device slave address selection pin in I2C mode. 1: 0x19; 0: 0x18.
4 SDA
SDI
SDO		 Data pin in I2C mode;
Data input/output pin in SPI mode;
5 RES Ground.
6 GND Ground.
7 GND Ground.
8 GND Ground.
9 Vdd Power supply.
10 Vdd_IO IO reference level pin.
11 INT2 Interrupt pin 2.
12 INT1 Interrupt pin 1.

In this section, we use the I2C interface for communication, and the power supply voltage is 1.8 V. The specific wiring is as follows: connect VCC to pin 2 of J0202, GND to pin 30 of J0202, SCL to pin 17 of J0201, SDA to pin 14 of J0201, SDO/SA0 to pin 1 of J0202, CS to pin 9 of J1006, and INT1 to pin 2 of J0201. The wiring diagram between the LIS2DH12 sensor and the EVB is as follows:

media_i2c_lis2dh_2

The SDO/SA0 pin is at a high level, so it can be confirmed that the slave address of the accelerometer sensor is 0x19.