Bridge Sensor Signal Conditioner IC with LIN Interface,

Nonlinearity Correction, Temperature Compensation

Data Sheet

ADA4558

Rev. 0

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FEATURES

LIN 2.1 compliant interface (bridge sensor signal, temperature)

Digitally programmable gain and offset voltage adjustment

Gain range from 2.94 V/V to 971.10 V/V

Sensor temperature compensation (first- or second-order)

Sensor nonlinearity correction (first- or second-order)

Internal or external temperature sensor compensation

EEPROM nonvolatile memory for calibration data

High system accuracy: 0.1% FSR over temperature

EMC and EMI protection

Fault protection for open circuits and short circuits

4 mm × 4 mm, 20-lead LFCSP

6 V to 18 V supply operation

−40°C to +150°C operating temperature range

AEC-Q100 qualified for automotive applications

APPLICATIONS

Strain gage

Pressure signal conditioner for automotive vehicles

GENERAL DESCRIPTION

The ADA4558 is a fully integrated, sensor signal conditioner

IC for bridge sensors. The device provides digital nonlinearity

correction and temperature compensation via internal or external

sensed temperatures using on-chip correction and calibration

hardware that can be optimized for a specific bridge sensor.

The ADA4558 utilizes a fourth-order digital correction algorithm

and delivers a system accuracy of 0.1% full scale range (FSR) for

bridge sensors with second-order nonlinearity sensitivity. The

ADA4558 includes a local interconnect network (LIN) physical

interface for single-wire, high voltage communications in

automotive environments. LIN 2.1 and earlier versions are

supported. The LIN interface allows access to measurements,

end of line (EOL) calibration, and a wide range of diagnostic

functions.

The analog subsystem consists of an analog-to-digital

converter (ADC) and a programmable gain amplifier (PGA)

with a wide gain range from 2.94 V/V to 971.10 V/V. To minimize

power supply noise, the bridge sensor is biased with an internal

4 V voltage regulator. The ADA4558 is fully specified from −40°C

to +150°C. The device operates from battery supply voltages

of 6 V to 18 V. The ADA4558 is available in a 4 mm × 4 mm,

20-lead lead frame chip scale package (LFCSP).

FUNCTIONAL BLOCK DIAGRAM

LOW-PASS

FILTER

±OFFSET ADJUSTMENT

INTERNAL

TEMPERATURE

SENSOR

VREG

REFERENCE

POWER SECTION

ADA4558

LIN

TRANSCEIVER

DIGITAL CORRECTION ENGINE

CORRECTION ALGORITHM

FAULT HANDLING

COMMUNICATION BUS

VDD12

DVDD

LIN2

LIN

5V LDO

STATIC

RANDOM

ACCESS

MEMORY

EEPROM

ONE TIME

PROGRAM-

MABLE

MEMORY

1.8V LDO

IIR

FILTER

VREG

14-BIT

ADC

MUX

EMI

FILTER

PGA

AFE

VREG

VREG

INPUT VOLTAGE = 6V TO 18V

0.1µF

VPOS

VNEG

SENSOR

BRIDGE

OPTIONAL

EXTERNAL

RESISTIVE

TEMPERATURE

DETECTOR

VREG

TPOS

+

–

RREFN

TNEG

ISINK

AGND

DGND

LINGND

Figure 1.