This happens very often because working voltages of the MCU jumped from 5 volts to 3.3 volts and nowadays, to as low as 1.8 volts. Another problem (for the clip) is if the EEPROM in question has a too low profile, making it impossible to have enough grip on the chip body to keep the clip in place.Ībove all inconveniences of programming an EEPROM in an “in-circuit” fashion is the possible situation that the microcontroller (MCU) in the ECM circuit could be sensitive to voltages that the EEPROM programmer uses for reading and writing the EEPROM chip. Some of those inconveniences are the need of cleaning the EEPROM leads from any protecting silicon, glue, or resin/flux coating the ECM might have in the circuit covering the individual components. Sometimes when working with immobilizer EEPROMs, the ideal way of programming the EEPROM is by doing it while it is in the circuit, as removing it, programming, and resoldering it back to the circuit adds a bit more effort and time to complete the job.ĭoing it “in-circuit” can be accomplished in many ECMs (not all) by using the SOIC-8 clip or 8 separate SMD pincers and connecting any of those two solutions over the EEPROM chip while it is in the circuit, but sometimes, some inconveniences are present.
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