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MLX90320 PDF预览

MLX90320

更新时间: 2024-11-29 04:15:11
品牌 Logo 应用领域
迈来芯 - MELEXIS 传感器
页数 文件大小 规格书
32页 625K
描述
Automotive small sensor interface

MLX90320 数据手册

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MLX90320  
Automotive small sensor interface  
Features and Benefits  
Applications Examples  
Suited cost optimized sensors: gain and  
offset correction by programmable  
coefficients  
Higher order temperature compensation  
provided for both gain and offset  
External or internal temperature sensor  
for compensation of temperature errors  
Over-voltage protection  
Pressure transducers, strain gauges,  
accelerometers, position sensors, etc.  
Steering systems (e.g. torque sensors)  
Safety restraints systems (e.g. seat  
occupant detection)  
Braking systems (e.g. ABS, force)  
Comfort systems (e.g. air conditioning)  
Engine management (e.g. injection)  
Any bridge type sensor  
Fault detection and clamping levels  
Ratio-metric output: 0 to 5V  
Single Pin Digital Programming  
Fully analog signal path  
Ordering Information  
Part No.  
Temperature Code  
Package Code  
MLX90320LFR  
L (-40°C to 150°C)  
FR (SSOP 209 mil)  
1 Functional diagram  
2 General description  
The MLX90320 covers the most typical resistive  
type of Wheatstone bridge applications for use in an  
automotive environment. It is a monolithic silicon  
analog integrated sensor interface that converts  
small changes in resistors, configured in a full  
Wheatstone bridge on a sensing element, to large  
output voltage variations.  
VDD  
7bits  
Over- & Reverse  
Voltage Protection  
POR  
Optional clamping  
levels and fault  
detections  
DAC  
CSOF  
Ratiometric  
Chopping  
Chopping  
Oscillator: 4 MHz (+/-  
15%) -> 250kHz dig  
+
INM  
INP  
Gdido  
Gdts  
-
Gcs  
IINV  
VDD  
DAC  
FLT  
1
2
10bits  
VDD  
TMP  
Select  
Application  
mode Output  
Programming  
mode I/O  
10bits  
DAC  
Fine Offset  
=
Fine Gain  
+
=
Oo  
+
O1.(T-T1) + O2.(T-T1)×  
X2.117  
X(-1.667)  
Go  
+
G1.(T-T1) G2.(T-T1)×  
Fine Offset  
Fine Gain  
VDD  
The signal conditioning includes gain adjustment,  
offset control and second order temperature  
compensation in order to accommodate variations of  
the different resistive sensing elements.  
Go,G1,G2  
EEPROM  
TMP  
T
Oo,O1,O2  
T1  
TMP  
Gain  
ALU  
ADC  
Go,G1,G2,Oo,O1,O2,T1, Gcs,  
Gdido, Gdts, IINV, TMP_Select,  
TMP_Offset, TMP_Gain,  
10bits  
TMP  
Offset  
CSOF, CLKAdj, Clamp_settings  
Compensation values are stored in EEPROM and  
can be reprogrammed with an interface circuit and a  
provided software. The MLX90320 is programmed  
with a single wire serial interface through the output  
pin.  
The user can specify on chip clamping levels thus  
creating fault detection bands. By intercepting  
various fault modes the MLX90320 is able to inform  
about the reliability of its analog output signal.  
3901090320  
Rev 004  
Page 1 of 32  
Data Sheet  
Mar/05  

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