Table of Contents
Advertisement
3. TECHNICAL BRIEF
The Main Base Band Processor(MT6253) contains two dedicated smart card interfaces to allow the
MCU to access the two SIM cards. Each interface can operator via 5 terminals. As shown is the Figure
3.8.2, SIMVCC, SIMSEL, SIMRST, SIMCLK and SIMDATA are for one SIM interface, while SIM2VEE, SIM2SEL,
SIM2RST, SIM2CLK and SIM2DATA are for the other one.
The functions of the two SIM interfaces are identical; therefore, only first SIM interface will be described
in this document.
The VSIM is used to control the external voltage supply to the SIM card and SIM SEL determines the
regulated smart card supply voltage. SIMRST is used as the SIM card reset signal. Besides, SIMDATA and
SIMCLK are used for data exchange purpose
LGE Internal Use Only
Figure 3.8.2 SIM Interface block diagram
- 40 -
3. TECHNICAL BRIEF
Copyright © 2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Advertisement
Table of Contents
