User's Manual
Table Of Contents
- Document history
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- Design example
- List of parts and accessories
MC55/56 Hardware Interface Description
Confidential / Preliminary
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MC55/56_hd_v03.00 Page 27 of 104 16.08.2005
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 5.3. 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 3.5.3 and 0)
• via RTC interrupt: starts Alarm mode (see Chapter 3.3.1.4)