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 50 of 97 11.05.2005
3.12 I
2
C Interface
I
2
C is a serial, 8-bit oriented data transfer bus for bit rates up to 400kbps in Fast mode. It
consists of two lines, the serial data line I2CDAT and the serial clock line I2CCLK.
The TC63 module acts as a single master device, e.g. the clock I2CCLK is driven by module.
I2CDAT is a bi-directional line.
Each device connected to the bus is software addressable by a unique 7-bit address, and
simple master/slave relationships exist at all times. The module operates as master-
transmitter or as master-receiver. The customer application transmits or receives data only
on request of the module. To configure and activate the I
2
C interface use the AT^SSPI
command described in [1].
To configure and activate the I
2
C bus use the AT^SSPI command. Detailed information on
the AT^SSPI command as well explanations on the protocol and syntax required for data
transmission can be found in [1].
The I
2
C interface can be powered from an external supply or via the VEXT line of TC63. If
connected to the VEXT line the I
2
C interface will be properly shut down when the module
enters the Power-down mode. If you prefer to connect the I
2
C interface to an external power
supply, take care that VCC of the application is in the range of V
VEXT
and that the interface is
shut down when the PWR_IND signal goes high. See figures below as well as Section 7 and
Figure 38.
In the application I2CDAT and I2CCLK lines need to be connected to a positive supply
voltage via a pull-up resistor.
For electrical characteristics please refer to Table 17.
GSM module
I2CDAT
I2CCLK
GND
I2CDAT
I2CCLK
GND
Application
VCC
R
p
R
p
w
VEXT
Figure 15: I
2
C interface connected to VCC of application