Bridge Sensor Signal Conditioner IC with LIN Interface,
Nonlinearity Correction, Temperature Compensation
Data Sheet
ADA4558
FEATURES
GENERAL DESCRIPTION
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
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.
APPLICATIONS
The analog subsystem consists of an analog-to-digital
Strain gage
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).
Pressure signal conditioner for automotive vehicles
FUNCTIONAL BLOCK DIAGRAM
INPUT VOLTAGE = 6V TO 18V
VDD12
DVDD
POWER SECTION
VREG
5V LDO
AFE
1.8V LDO
REFERENCE
VREG
VPOS
VNEG
0.1µF
DIGITAL CORRECTION ENGINE
CORRECTION ALGORITHM
EMI
FILTER
LOW-PASS
FILTER
SENSOR
BRIDGE
VREG
LIN2
PGA
FAULT HANDLING
LIN
LIN
14-BIT
ADC
IIR
FILTER
MUX
TRANSCEIVER
±OFFSET ADJUSTMENT
VREG
+
COMMUNICATION BUS
VREG
RREFN
STATIC
ONE TIME
PROGRAM-
MABLE
EEPROM
TPOS
TNEG
RANDOM
ACCESS
MEMORY
OPTIONAL
EXTERNAL
MEMORY
RESISTIVE
–
TEMPERATURE
DETECTOR
INTERNAL
TEMPERATURE
SENSOR
ISINK
ADA4558
AGND
DGND LINGND
Figure 1.
Rev. 0
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