MAXIM公司的MAX21000是一款實現低功耗、低噪音、3軸角速度傳感器，具有史無前例的精度、溫度和時間的靈敏性。最低功耗特性可以使該芯片工作在最低1.71V電壓，該芯片主要由傳感器元件和IC接口兩部分組成，傳感器部分用于測量角速度，數字接口實現與外圍數據的傳輸接口。本文首先介紹芯片的簡介、特性、內部框圖及應用領域，并給出相應設計方案的設計原理圖、元器件列表及PCB元件布局圖。
The MAX21000 is a low power, low noise, 3-axis angular rate sensor that delivers unprecedented accuracy and sensitivity over temperature and time. It operates with a supply voltage as low as 1.71V for minimum power consumption. It includes a sensing element and an IC interface that provides the measured angular rate to the external world through a digital interface (I2C/SPI).
The IC has a full scale of ±31.25/±62.50/±125/±250/ ±500/±1k/±2k degrees per second (dps) and measures rates with a finely tunable user-selectable bandwidth. The high ODR and the large BW, the low noise at highest FS, together with the low phase delay, make the IC suitable for both user interface (UI) and optical image stabilization (OIS) applications.
The IC is a highly integrated solution available in a compact 3mm x 3mm x 0.9mm plastic land grid array (LGA) package and does not require any external components other than supply bypass capacitors. It can operate over the -40ºC to +85ºC temperature range.
MAX21000主要特性：
● Minimum Overall Footprint
• Industry’s Smallest and Thinnest Package for Portable Devices (3mm x 3mm x 0.9mm LGA)
• No external components
● Unique Low-Power Capabilities
• Low Operating Current Consumption (5.4mA typ)
• Eco Mode Available at 100Hz with 3.0mA (typ)
• 1.71V (min) Supply Voltage
• Standby Mode Current 2.7mA (typ)
• 9μA (typ) Power-Down Mode Current
• High PSRR and DC-DC Converter Operation
• 45ms Turn-On Time from Power-Down Mode
• 5ms Turn-On Time from Standby Mode
● OIS Suitability
• Minimum Phase Delay (~3º at 10Hz)
• High Bandwidth (400Hz)
• High ODR (10kHz)
• Low Noise (9mdps/√Hz typ)
• Four Different FS in OIS Mode: ±31.25/±62.50/±125/±250 dps
● Unprecedented Accuracy and Stability
• Embedded Digital-Output Temperature Sensor
• Automatic Temperature Compensation
• Ultra-Stable Over Temperature and Time
• Factory Calibrated
● High-Speed Interface
• I2C Standard (100kHz), Fast (400kHz), and High-Speed (3.4MHz) Serial Interface
• 10MHz SPI Interface
• Reduces AP Load
• Enables UI/OIS Serial Interface Multiplexing
● Flexible Embedded FIFO
• Size: 512bytes (256 x 16 bits)
• Single-Byte Reading Available
• Four Different FIFO Modes Available
• Reduces AP Load
● High Configurability
• Integrated Digitally Programmable Low- and Highpass Filters
• Independently Selectable Data ODR and Interrupt ODR
• 7 Selectable Full Scales (31.25/62.5/125/250/500/ 1000/2000 dps)
• 256 Selectable ODR
● Flexible Interrupt Generator
• Two Digital Output Lines
• 2 Independent Interrupt Generators
• 8 Maskable Interrupt Sources Each
• Configurable as Latched/Unlatched/Timed
• Embedded Independent Angular Rate Comparators
• Independent Threshold and Duration
• Level/Pulse and OD/PP Options Available
● Flexible Data Synchronization Pin
• External Wakeup
• Interrupt Generation
• Single Data Capture Trigger
• Multiple Data Capture Trigger
• LSB Data Mapping
● Unique 48-Bit Serial Number as Die ID
● High-Shock Survivability (10,000 G-Shock)
MAX21000應用：
● Motion Control with MMI (Man-Machine Interface)
● No Touch UI
● GPS Navigation Systems
● Appliances and Robotics
● Motion-Enabled Game Controllers
● Motion-Based Portable Gaming
● Motion-Based 3D Mouse and 3D Remote Controls
● Health and Sports Monitoring
● Optical Image Stabilization
圖1. MAX21000內部方框圖
MAX21000方案介紹：
The MAX21000 Maxim inertial demo (MInD) evaluation kit (EV kit) allows evaluating the performance of the MAX21000 ultra-accurate, low-power, 3-axis digital output gyroscope.
The MInD EV kit provides a complete ecosystem composed of hardware and software to evaluate the gyroscope using a PC.
Using the USB connection and a PC, it is possible to evaluate the main important parameters and configurations of the device.
Features
● Easy Evaluation of the MAX21000
● USB 2.0 Support
● Power Provided Through the USB
● Supply Available with Battery
● Windows®-Compatible Graphical-User Interface (GUI)
● RoHS Compliant
● Proven Schematics
● Proven PCB Layout
● Fully Assembled and Tested
MAX21000方案原理圖：
圖2. MAX21000方案原理圖
MAX21000方案材料清單：
PCB元件布局圖：
