ZMDI ZSSC3170汽车传感器信号调理方案

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ZMDI公司的ZSSC3170是集成了LIN和PWM接口的汽车传感器信号调理器,最大模拟增益420,并具有扩展的失调补偿.器件和LIN指标1.3 / 2.0 / 2.1兼容,数据转换速率高达430Hz,电源电压7-18V,ADC分辨率13-14位,输出分辨率达12位,睡眠模式的电流消耗小于100uA.本文介绍了ZSSC3170主要特性, 方框图和多种应用电路.
ZSSC3170: Automotive Sensor Signal Conditioner with LIN and PWM Interface
The ZSSC3170 is a CMOS integrated circuit for highly accurate amplification and sensor specific correction of bridge sensor signals. Featuring a maximum analog gain of 420, as well as extended offset compensation capabilities, the ZSSC3170 is adjustable to nearly all resistive bridge sensor types.
Digital compensation of offset, sensitivity, temperature drift, and nonlinearity is accomplished via a 16-bit RISC microcontroller. Conditioning coefficients are stored in an EEPROM certified for automotive applications.
Measured values are provided by one of the digital LIN or PWM interfaces. Each interface can support end-of-line calibration using the sensor output. Noise sensitivity is greatly reduced because the calibration equipment and the ZSSC3170 are mated digitally.
For quick and easy evaluation and support for calibrating prototypes, ZMDI offers the ZSSC3170 SSC Evaluation Kit, which includes evaluation hard-ware, SSOP20 samples, and software.
ZSSC3170主要特性:
Complies with LIN specifications 1.3/2.0/2.1
Configurable LIN publisher frame content
Data conversion rate of up to 430Hz fully utilizes the maximum LIN channel capacity of 20kbit/s
PWM high-side and low-side switches, support for LIN communication for end-of-line calibration
Digital compensation of offset, gain, temperature effects up to 2nd order, and nonlinearity up to 3rd order. Compensation of temperature sensor offset, gain, and nonlinearity up to 2nd order.
Internal or external temperature reference
Media temperature sensing by diode or RTD
Load dump protection of the LIN pin up to ?±40V
Operating temperature range: -40 to 125?℃
Extended operating temperature range: ?‰¤150?℃
Accuracy
?±0.25% FSO @ -20 to 85?℃
?±0.50% FSO @ -40 to 125?℃
?±1.00% FSO @ -40 to 150?℃
3 EEPROM words available for optional use data
ZSSC3170优势:
Measurand and temperature signal available via one output pin
Compatible with nearly all resistive bridge inputs
No external trimming components required
Single-pass calibration minimizes calibration costs
End-of-line calibration using sensor output
Optimized for automotive environments with special protection circuitry, excellent electro-magnetic compatibility, and numerous diagnostic features
ZSSC3170物理特性:
Supply voltage: 7 to 18V
Current consumption in Sleep Mode: ≤ 100μA Input span: 1.8 to 267 mV/V
ADC resolution: 13 to 14 bit
Output resolution: up to 12-b
Package: SSOP20 or die

图1.ZSSC3170方框图

图2.ZSSC3170 LIN压力传感器和温度传感器

图3.ZSSC3170低边开关PWM模式应用电路图

图4.ZSSC3170高边开关PWM模式应用电路图

图5.ZSSC3170LIN模式应用电路图