E520.44数据手册Elmos中文资料规格书

描述 Description

The IC E520.44 is a sensor signal processor (SSP) designed to amplify and treat the signal of piezoelectric resistive bridges. It comprises wide programming range and comprehensive diagnostic features.
A low-noise instrumentation amplifier with tuning capability of gain and offset amplifies the input from the bridge to a level which fits the input range of a 14-bit deltasigma AD-converter. Subsequently, this digitized input after low-pass filtering is compensated for thermal drifts of offset and gain in the digital domain. A temperature signal from an on-chip sensor or an external T-sensor is employed for this and its digitized output is fed to the compensation calculator, too. Besides compensation of thermal drifts of offset and gain, the compensation engine also can suppress non-linearity in signal gain up to 3rd order. The output from the calculator engine is fed into a DA-converter driving an analogue voltage buffer at OUT which provides a ratiometric output signal. Alternatively a SENT-output can be used instead of the analogue voltage output.
In configuration or diagnostic modes the OUT pin is used as a single-wire serial data interface for in-system calibration with only 3 wires to the outside. Calibration and configuration data for a specific sensor are stored in EEPROM. The IC includes also self-test and diagnostics of the sensor bridge attached and of the SSP itself. If faults are detected, they are indicated at the sensor output in failure state.

特性 Features

·ƒVery low noise front-end amplifier and ADC allows SNR>70dB for inputs down to 1mV/V
·ƒƒPGA configurable to 1 .. 50mV/V and adjustable offset: ±150% FS
·ƒƒDigital compensation of offset- and gain-drift and non-linearity up to 3rd order
·ƒƒAnalog voltage, or digital SENT (SAE J2716, JAN2010 ) output
·ƒƒSupply 5.0 ± 0.5V, over-voltage a. reverse polarity protection (28V)
·ƒƒSingle-wire programming interface

应用 Application

·ƒMEMS or thin film piezo sensors
·ƒƒStrain gauge transducers
·ƒƒAutomotive or industrial products using resistive sensor bridges