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Table of Contents
Description
This part was taken from a Motronic M1.7 engine control unit (ECU), which was used on the M42 engine of the BMW E30 318iS.
This chip is known, with reasonable certainty, to be a Siemens SAB80C515. All of the Motronic 1.x series ECUs used a variant of this MCU, with some being produced by AMD. A variety of Bosch part numbers (B5xxxx) can be found across different years as there were almost countless versions and revisions of the various M1.x ECUs. In all cases, all of the executable code is stored externally on a 16KB/32KB/64KB UV-EPROM (depending on the Motronic version), with the exception of interrupt vectors and possibly some other boot code that reside in the internal 8K ROM. In some applications, the contents of the 8K internal ROM are also present in the EPROM and executed from there as well.
Datasheet: http://www.keil.com/dd/docs/datashts/infineon/80x515_um.pdf
Package
Label (top):
SIEMENS B57828 (Bosch internal PN) BD26401 AC ©INTEL'80 9025
Die
Decap Steps: (Bic lighter + water quench) x 4 cycles Selective crushing with pliers and bench vise Capture Details: Imaging device: Keyence VHX-2000 Magnification: 200X Markings: SIEMENS 1993 M230-G .67
Note: The die was badly damaged during decapsulation. A future effort at doing this chemically is on the to-do list.