User's Manual l MBa7x UM 0101 l © 2020, TQ-Systems GmbH
Page 48
4.2.13
Smart card X6
The smart card interface on the MBa7x supports Class B (3.0 V) and Class C (1.8 V) cards according to ISO/IEC 7816.
It is not switched automatically between Class B and C, this can be done by software.
(GPIO on Port-Expander 2, SC_MOD_VCC, see Table 14).
A high level on SC_MOD_VCC switches SIM_VCC to 3 V, a low level switches SIM_VCC to 1.8 V.
SC_MOD_VCC is set to Low by default
SIM_VCC = 1.8 V.
Note:
5 V Smart cards
SIM cards that require 5 V supply/signal level are not supported.
TQMa7x
Smart Card
(X6)
Smart Card
Level shifter
SIM
SIM
GPIO
Expander
I2C2
GPIO
Figure 39: Block diagram Smart card
Figure 40: Position of Smart card X6
Table 59:
Type of Smart card connector
Manufacturer / Number
Description
Amphenol / C702 10M008 252 40
Smart card connector
Table 60:
Pinout Smart card – X6
Pin
Signal
Remark
C1
SIM_PWR
–
C2
SIM_RST
–
C3
SIM_CLK
–
C4
NC
–
C5
DGND
–
C6
NC
–
C7
SIM_DATA
–
C8
NC
–
S1
SIM.PD
10 kΩ Pull-Up to VCC3V3. Connected to DGND with inserted card
S2
DGND
–
M1-M5
DGND
Shield