LIS3DHTR Alternatives, Specifications, Dimensions and Package
06 March 2024
Ⅲ. Schematic diagram and working principle of LIS3DHTR
Ⅴ. Electrical characteristics of LIS3DHTR
Ⅵ. What is the function of FIFO buffer of LIS3DHTR?
Ⅶ. Dimensions and package of LIS3DHTR
LIS3DHTR is a triaxial linear accelerometer with ultra-low power consumption and high performance that converts the dynamic acceleration of a physical device into a voltage signal for measurement. This triaxial accelerometer is capable of detecting a wide range of dynamic states such as orientation, shaking, tapping, double-tapping, tilting, motion, positioning, shock or vibration. In this article, we will take an in-depth look at the specifications, features, dimensions, and package of the LIS3DHTR and provide you with guidance on using this chip.
LIS3DHTR is a three-axis linear accelerometer with ultra-low power consumption and high performance in the "nano" series. It uses a digital I2C/SPI serial interface standard output. This device is designed with ultra-low power operating modes to enable advanced power saving and smart embedded features. The LIS3DHTR offers a dynamic user-selectable full-scale range of ±2g/±4g/±8g/±16g and can measure acceleration at output data rates from 1 Hz to 5.3 kHz. In addition, the device can be configured to use two independent inertial wake/free-fall events as well as the device's position to generate interrupt signals. The thresholds and timing of these interrupt generators can be programmed on the fly by the end user. LIS3DHTR also integrates a 32-level first-in-first-out (FIFO) buffer, allowing users to store data with less intervention on the host processor. The chip is packaged in a small, low-profile plastic land grid array (LGA) and operates stably over the extended temperature range of -40°C to +85°C.
Alternatives and equivalents:
• LIS3DH
• MAX21000+
• Part Status: Active
• Resolution: 16 bit
• Pin Count: 16
• Supply Voltage: 1.71V ~ 3.6V
• Package / Case: LGA-16
• Packaging: Tape & Reel (TR)
• Mounting Style: SMD/SMT
• Operating Supply Current: 11 uA
• Operating Supply Voltage: 2.5 V
• Operating Temperature: -40°C ~ 85°C
• Manufacturer: STMicroelectronics
• Product Category: Accelerometers
The working principle of LIS3DHTR includes data acquisition, interrupt processing, power saving mode and FIFO buffer, etc.
• Data acquisition: When the LIS3DHTR is activated, it receives data from the host via the digital I2C/SPI serial interface. The accelerometer analog input channel is configured to measure acceleration in three axes and transmit the data to the host processor.
• Interrupt processing: When LIS3DHTR detects free fall or other external events, it sends an interrupt signal to the host processor. The interrupt handler is executed in response to the event and takes necessary action.
• Power save mode: LIS3DHTR features an advanced power save mode that extends battery life without sacrificing performance. For example, in low-power mode, an accelerometer can output data less frequently to reduce power consumption.
• FIFO buffer: The LIS3DHTR features an integrated 32-level first-in-first-out (FIFO) buffer that allows the user to store data to limit access by the host processor. This helps optimize the accelerometer output and improves system performance and stability.
First of all, we need to connect the LIS3DHTR correctly to the corresponding pins of the microcontroller or processor, and make sure the power supply and grounding are correct. Next, the sensor must be initialized before use, which includes setting key parameters such as its operating mode, range, and sampling rate, and is usually done through a communication interface such as I2C or SPI. After initialization, the sensor can start data acquisition. Depending on the requirements, we can choose either single measurement or continuous measurement mode; in continuous mode, the sensor will continue to output data until it receives a stop command. Subsequently, for further processing or analysis, we need to read the data collected by the sensor. This is usually accomplished by sending a read command to the sensor and receiving the acceleration data it returns. After obtaining the data, we can perform a variety of processes, such as calculating the acceleration value, detecting the state of motion, or performing attitude estimation, which may require the use of mathematical operations or specific algorithms. In some cases, we also need to calibrate the sensor to ensure the accuracy of its output. The calibration process typically involves measuring and adjusting the sensor's output under known conditions. Finally, depending on the specific application requirements, we integrate LIS3DHTR into the project. This may involve writing code to control the sensor, process the data, and seamlessly integrate it into the overall system.
Vdd=2.5V, T=25°C unless otherwise noted
1. Typical specifications are not guaranteed.
2. It is possible to remove Vdd maintaining Vdd_IO without blocking the communication bubbles, in this condition the measurement chain is powered off.
In LIS3DHTR, the FIFO buffer functions as follows:
1. Data processing: FIFO buffer is suitable for data processing. Specifically, it can be used to store data over a period of time so that the data can be analyzed or processed in depth at a later point in time.
2. Data storage: The FIFO buffer can temporarily store the data generated by the accelerometer, allowing buffering when the data is not immediately processed by the processor to prevent data loss.
3. Data transfer: FIFO buffer allows data to be stored at a certain rate and read at another rate when needed. This facilitates data flow control between sensor data generation and processing.
4. Reduced power consumption: By storing sensor data in a FIFO buffer, the processor can read data from the buffer when needed instead of continuously monitoring sensor output. This reduces system power consumption and extends battery life.
The package diagram of LIS3DHTR is as follows:
The LIS3DHTR has a length of 3 mm, a width of 3 mm, and a height of 1 mm. In terms of package technology, LIS3DHTR uses the LGA-16 (Land Grid Array-16) package form. As a high-density surface mount technology, LGA-16 package significantly enhances the stability and reliability of the connection between the chip and the circuit board by setting metal contacts on the bottom of the chip. This package method not only optimizes the electrical performance of the sensor, but also helps achieve smaller package size and higher integration.
In addition, LIS3DHTR also uses tape & reel (TR) packaging. TR packaging is a type of packaging that is particularly suitable for automated production lines. It fixes multiple sensor chips on a strip of material in a specific arrangement. This packaging method facilitates automated patching, inspection and testing, thereby improving production efficiency and reducing production costs. At the same time, TR packaging can also effectively protect the sensor from electrostatic and mechanical damage, ensuring its stability and reliability during use.
Frequently Asked Questions
1. What is triaxial accelerometer?
Triaxial accelerometers provide simultaneous measurements in three orthogonal directions, for analysis of all of the vibrations being experienced by a structure. Each unit incorporates three separate sensing elements that are oriented at right angles with respect to each other.
2. What is the operating temperature range of LIS3DHTR?
The operating temperature of LIS3DHTR ranges from -40°C to 85°C.
3. How does LIS3DHTR detect motion?
LIS3DHTR detects motion by measuring acceleration along three axes using its built-in accelerometer and analyzing changes in acceleration over time.
4. What are some common applications of LIS3DHTR?
LIS3DHTR is commonly used in applications such as motion-activated functions, free-fall detection, and tilt sensing in smartphones, tablets, gaming devices, and wearable devices.
