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
s
MC55/56_hd_v03.00 Page 61 of 104 16.08.2005
3.12 Control signals
3.12.1 Inputs
Table 17: Input control signals of the MC55/56 module
Signal Pin Pin status Function Remarks
Falling edge Power up MC55/56
Ignition
/IGT
Left open or HiZ No operation
Active low ≥ 100ms (Open
drain/collector driver to GND
required in cellular device
application).
Note: If a charger and a
battery is connected to the
customer application the /IGT
signal must be 1s minimum.
Low Power down
MC55/56
Emergency
shutdown
/EMERG-
OFF
Left open or HiZ No operation
Active low ≥ 3.2s (Open
drain/collector driver required
in cellular device application).
At the /EMERGOFF signal the
watchdog signal of the GSM
engine can be traced (see
description in Table 26).
(HiZ = high impedance)