User's Manual
Table Of Contents
- Contents
- Figures
- Tables
- Document History
- Introduction
- Product concept
- Application Interface
- Antenna interface
- Electrical, reliability and radio characteristics
- Mechanics
- Reference Approval
- List of parts and accessories
MC46 Hardware Interface Description
DRAFT
MC46_HD_V02.8xb Page 27 of 98 21.08.2003
3.3.1.1 Turn on MC46 using the ignition line /IGT (Power on)
To switch on MC46 the /IGT (Ignition) signal needs to be driven to ground level for at least
100ms and not earlier than 10ms after the last falling edge of VDD. This can be
accomplished using an open drain/collector driver in order to avoid current flowing into this
pin.
Software
controlled
/EMERGOFF
ca. 300ms ca. 900ms
Serial interfaces
ASC0 and ASC1
Undefined
Inactive
Active
VDD
ca. 60ms
/TXD0
/TXD1
/DSR0
BATT+
/IGT
min. 10ms
min.
100ms
HiZ
HiZ
Figure 3: Power-on by ignition signal
If configured to a fix baud rate, MC46 will send the result code ^SYSSTART to indicate that it
is ready to operate. This result code does not appear when autobauding is active. See
Chapter AT+IPR in [1].
In a battery operated MC46 application, the duration of the /IGT signal must be 1s minimum
when the charger is connected and you may want to go from charging to Normal mode.
For details please see Chapter 3.3.1.2