CJ138 | Control and amplifier circuit with pin-pointing for wide range oxygen sensors

High-end oxygen sensor ASIC includes CARB pin-pointing capability, software configuration and ultimate accuracy

CJ138 controls linear 1 or 2 cell linear oxygen sensors inside an engine control unit (ECU) for Gasoline or Diesel engines.

The IC can interface with various sensors by configuring the corresponding registers. It also supports CARB sensor pin-pointing diagnostics for engine control applications.

Accuracy is the same as CJ135 and CJ136 due to sensor resistance measurement and heating regulation to keep sensor temperature at a constant level.

Benefits

General interface for use with 1 or 2 cell linear oxygen sensors with the same HW module

Sensor type selectable via software

Pin-pointing diagnosis capability

Technical Features


Type	Oxygen sensor control & evaluation IC
Package	TQFP32ePad
Features	Pump current control and measurement Lambda measurement result via SPI interface Nernst cell reference voltage source Pin-pointing diagnosis for detection of open load, short circuit to GND, short circuit to battery Extended sensor cell impedance measurement for temperature control Active blackening control for maximum sensor protection OBD II conformity Fully operational at 9V
Oxgen sensor type	Bosch LSU5.2 NTK ZFAS-U3 Denso Plus 6.1
Interface	In: IP, Nernst voltage Out: Voltage digital on SPI and UART
Tj min [°C]	-40°C
Tj max [°C]	150°C

TQFP_32ePad (7 × 7 mm)

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