Template:24 PIN Family FAQ

Current Draw on the 24-pin family

Power draw should be the base below, plus power required for sensor inputs (from XDRP) and driven loads.

• SECM08xx(ECM PROD): approx. 100 mA at 13.8 V (key on, module-only, no external loads or sensors).
• SECM08xx (ECM DEV) : approx. 270 mA at 13.8 V (key on, module-only, no external loads or sensors).
• MCHI04xx (GCM PROD): approx. 100 mA at 13.8 V (key on, module-only, no external loads or sensors).
• MCHI04xx (GCM DEV) : Does not exist.

The above numbers are from a quick test here on-bench for the various modules, with a baseline "empty" application and with nothing but power, ground, and CAN connections. The SECM08xx (ECM DEV) draws additional current, to drive the additional calibratible memory circuitry. This data comes from one SECM 24-pin DEV module.

For the MCHI04xx (GCM) family, the key-off fully-shutdown power draw on BATT should be less than 0.5 mA.

Difference between ECM0502 and GCM0402

When the controllers shutdown, there is a difference in the way calibrations are stored. ECM does not have separate KeySw and Battery pins so there is no way the controller would know to save the calibrations before a shutdown. In this case, it would have to save these values periodically. Whereas in case of a GCM, there are two separate KeySw and Battery pins so the module can save Non Volatile data when a shutdown is commanded and then go to sleep.