Specifications

MC55/56 Hardware Interface Description

Confidential / Released

MC55/56_hd_v04.00a Page 29 of 108 24.08.2006

3.3 Power up / down scenarios

In general, be sure not to turn on MC55/56 while it is out of the operating range of voltage

and temperature stated in Chapters

5.2 and 5.5. MC55/56 would immediately switch off after

having started and detected these inappropriate conditions.

3.3.1 Turn on MC55/56

MC55/56 can be activated in a variety of ways, which are described in the following chapters:

• via ignition line /IGT: starts normal operating state (see Chapters

3.3.1.1 and 3.3.1.2)

• via POWER line: starts charging algorithm (see Chapters

3.3.1.3 and 3.5.3)

• via RTC interrupt: starts Alarm mode (see Chapter

3.3.1.4)