MXR2500MW

By MEMSIC Inc.

Low Cost 2g Dual Axis Accelerometer with Ratiometric Outputs FEATURES Better than 1 mg resolution Dual axis accelerometer fabricated on a monolithic CMOS IC RoHS compliant On-chip mixed mode signal processing No moving parts 50,000 g shock survival rating 17 Hz bandwidth 3V to 5.25V single supply continuous operation Small (5.5mm x 5.5mm x 2.7mm) LCC XY/YZ sensing package Continuous self test APPLICATIONS Automotive – Vehicle Security/Active Suspension/ABS Headlight Angle Control/Tilt Sensing Security – Gas Line/Elevator/Fatigue Sensing Office Equipment – Computer Peripherals/PDA’s/Cell Phones White Goods – Spin/Vibration Control GENERAL DESCRIPTION The MXR2500MW is an ultra low noise and low cost, dual axis accelerometer fabricated on a standard, submicron CMOS process. It is a complete sensing system with on-chip mixed mode signal processing. The MXR2500MW measures acceleration with a full-scale range of 2 g and a sensitivity of 500mV/g @5V at 25 C. It can measure both dynamic acceleration (e.g., vibration) and static acceleration (e.g., gravity). The MXR2500MW design is based on heat convection and requires no solid proof mass. This eliminates stiction and particle problems associated with competitive devices and provides shock survival of 50,000 g, leading to significantly lower failure rates and lower loss due to handling during assembly. The MXR2500MW provides two absolute analog outputs. The typical noise floor is 0.2 m g/Hz allowing signals below 1 m g to be resolved at 1 Hz bandwidth. The 3dB rolloff of the device occurs at 17 Hz. The MXR2500MW is available in a LCC surface mount package (5.5 mm x 5.5 mm x 2.7 mm). It is hermetically sealed and is operational over a -40 C to +105 C temperature range. It also contains an on-chip temperature sensor and a bandgap voltage reference. SPECIFICATIONS (Measurements @ 25 C, Acceleration = 0 g unless otherwise noted; VDD, VDA =5.0V unless otherwise specified) Sensor Input: Measurement Range Each Axis 2 g; Nonlinearity Best fit straight line 0.5 1.0 % of FS; Alignment Error 1.0 degree; Transverse Sensitivity 2.0 % Sensitivity: Sensitivity, Analog Outputs at pins AOUTX and AOUTY Each Axis 475 500 525 mV/g; Change over Temperature from 25 C -25 +8 % Zero g Bias Level: 0 g Offset Each Axis -0.1 0.00 +0.1 g; 0 g Voltage 2.50 V; 0 g Offset over Temperature from 25 C based on 500mV/g 1.5 mg/C; 0.75 mV/C Noise Performance: Noise, rms 0.2 0.4 mg/Hz Frequency Response: 3dB Bandwidth - uncompensated 17 Hz Temperature Output: Tout Voltage 1.15 1.25 1.35 V; Sensitivity 4.6 5.0 5.4 mV/C Voltage Reference Output: VRef output @3V-5.25V supply 2.5 V; Change over Temperature 0.1 mV/C; Current Drive Capability Source 100 A Self Test: Continuous Voltage at AOUTX, AOUTY under supply voltage failure 5.0 V AOUTX and AOUTY Outputs: Normal Output Range 1.0 4.0 V; Current Source or sink, @ 3.0V-5.25V supply 100 A; Turn-On Time 160 mS Power Supply: Operating Voltage Range 3.0 5.25 V; Supply Current 3.5 mA Temperature Range: Operating Range -40 +105 C PACKAGE CHARACTERISTICS LCC-8 JA 110 C/W; JC 22 C/W; Device Weight < 1 gram PIN DESCRIPTION: LCC-8 PACKAGE 1 TOUT Temperature (Analog Voltage) O 2 Gnd Ground I 3 VDA Analog Supply Voltage I 4 AOUTX X-Axis Acceleration Signal O 5/J VDD Digital Supply Voltage I 6/M Vref 2.5V Reference Output O 7/L Sck Optional External Clock I 8/K AOUTY Y-Axis Acceleration Signal O ORDERING GUIDE MXR2500MW LCC8 RoHS compliant *LCC parts are shipped in tape and reel packaging. CAUTION ESD (electrostatic discharge) sensitive device.