Dual channel wideband oxygen controller

Development status

• Hardware: working in progress, check hardware/V0.0.1 for actual status
• Software: not started yet

Dual WBO controller based on

• Microchip AT90CAN128
• 2x Bosch CJ125 wideband lambda controller
• NXP TJA1050T high speed can transceiver
• Infineon TLE42754D LDO 5v and 450mA
• Analog Devices AD5337 8-bit DAC
• Analog Devices ADR02 5v and 10mA precision reference (0.1%) for TLS115
• Infineon TLS115B0EJ voltage tracker for analog part, provides 5v and 150mA
• ...

Features

• supports LSU4.9 probes only
• Automotive grade components
• 2x LSU 4.9 connector (TE 1813139-1)
• 4 layer PCB
• integrated with TunerStudio

Inputs

• 2x LSU4.9 probes
• CAN HS with up to 1mbit/s
• UART for configuration
• UBat input for activation the controller

Outputs

• dual analog output, either as 0..5V for Lambda 0.65 to 1.35 OR narrow band emulation
• CAN output (AEM X-Series protocol) for both channels and debug messages

Bosch CJ125 (LQFP32 package) part numbers

Bosch part number
30615
40103
30522

A couple of CJ125 ICs

Suitable Bosch lambda probes

Basically, the Bosch probes whose numbers start with 0 258 017 will fit, also Bosch 0 281 004.
Bosch numbers beginning with 0 258 007 are LSU 4.2 probes and will not fit.

Bosch number	Length overall	Comment
0 258 017 012	1060mm
0 258 017 025	1000mm	Bosch motorsport part
0 258 017 029	620mm	grey, used by BMW after 09/2006 (1178 7539124)
0 258 017 038	340mm	grey, used by BMW (11787537984)
0 258 017 092	950mm	black, used by BMW (1178 7540167)
0 258 017 126	680mm	black, used by BMW after 09/2006 (1178 7561410)
0 281 004 028	540mm
0 281 004 150	1215mm
0 281 004 184	1000mm
...

LSU4.9 probe pinout

Pin#	Color	Description	Symbol
1	red	Pump current APE	IP
2	yellow	Virtual ground IPN	VM
3	white	Heater voltage H-	Uh-
4	grey	Heater voltaget H+	Uh+
5	green	Trim Resistor RT	IA
6	black	Nernst voltage UN	RE