User's Manual
Table Of Contents
- Document History
- Introduction
- Product Concept
- Application Interface
- Operating Modes
- Power Supply
- Power Up / Power Down Scenarios
- Automatic GPRS Multislot Class Change
- Charging Control
- Summary of State Transitions (Except SLEEP Mode)
- RTC Backup
- SIM Interface
- Serial Interface ASC0
- Serial Interface ASC1
- USB Interface
- I2C Interface
- Audio Interfaces
- Control Signals
- Antenna Interface
- Electrical, Reliability and Radio Characteristics
- Mechanics
- Sample Application
- Reference Approval
- Appendix
TC63 Hardware Interface Description
Strictly confidential / Draft
s
TC63_HD_V00.432 Page 59 of 97 11.05.2005
3.14 Control Signals
3.14.1 Synchronization Signal
The synchronization signal serves to indicate growing power consumption during the transmit
burst. The signal is generated by the SYNC pin (pin number 32). Please note that this pin
can adopt three different operating modes which you can select by using the AT^SSYNC
command: the mode AT^SSYNC=0 described below, and the two LED modes AT^SSYNC=1
or AT^SSYNC=2 described in [1] and Section 3.14.2.
The first function (factory default AT^SSYNC=0) is recommended if you want your
application to use the synchronization signal for better power supply control. Your platform
design must be such that the incoming signal accommodates sufficient power supply to the
TC63 module if required. This can be achieved by lowering the current drawn from other
components installed in your application.
The timing of the synchronization signal is shown below. High level of the SYNC pin
indicates increased power consumption during transmission.
Figure 25: SYNC signal during transmit burst
*)
The duration of the SYNC signal is always equal, no matter whether the traffic or the
access burst are active.
Transmit burst
1 Tx 577 µs every 4.616 ms
2 Tx 1154 µs every 4.616 ms
SYNC signal
*)
t = 180 sµ