{{tag>collection_FelineFriendly vendor_bosch year_1996 foundry_unknown tech_unknown}}
====== Description ======
This part was taken from a Motronic M1.7.3 engine control unit (ECU), which was commonly used on 1.6L & 1.8L 4-cylinder BMWs of the mid-E36 generation. While this chip was likely used on a number of ECUs, the specific one in this case had Bosch PN 0 261 203 661.
Functionally, this chip provides a number of analog functions and some digital ones. It is a custom Bosch part.
- Buffers the ignition coil dwell (primary coil charging) signal from the MCU to the IC that drives the bases of the high current switching transistors
- Takes the MCU's TTL UART Rx+Tx signals, and handles their conversion to the bidirectional single-wire K-Line interface used for automotive diagnostics
- Filters and amplifies the analog output of a narrow-band oxygen sensor, which is fed to an ADC input on the MCU
- Filters the crankshaft sensor (variable reluctance type) signal, providing zero-crossing detection and offset adaptation, and ultimately outputs a TTL signal to the MCU which is used for sensing crankshaft rotation speed and angular position
====== Package ======
Label (top):
[Bosch Logo]
30318 (Bosch internal PN)
08/0896
A0887.1
{{:felinefriendly:bosch:b30318:s600_pkg.jpg?400|}}
{{:felinefriendly:bosch:b30318:s600_pkgref2.jpg?400|}}
====== Die ======
Decap Steps:
Selective crushing with bench vise
Capture Details:
Imaging device: Keyence VHX-2000
Magnification: 200X, 500X
Markings:
[Bosch Logo]
J53B
CJ53B (likely a reference to the commercial PN used by Bosch)
Imaged with the clear conformal coating left on the die (200X):
{{:felinefriendly:bosch:b30318:s600_die_coated_200x.jpg?400|}}
Imaged after scraping the conformal coating off, which damaged the metal layer (500X):
{{:felinefriendly:bosch:b30318:s600_die_500x_small.jpg?400|}}
//Note: This is a ~5X downsampled version of the original image. A full resolution version (16MB) can be provided. On the to-do list…//