Shenzhen Coban Electronics Co. Ltd. CB900 Manuale Utente
Electrical Characteristics
Figure 8: Example of a SIM socket implementation
4.8. Serial Link (UART) Interfaces
The module has two UART. Baud rate from 300 bits/s up to 115200 bits/s feature.
Note: Default factory setting baudrate is set at 115200, unless other specified.
Application
The block diagram below shows the possible UART connection.
automatically selects 1.8v or 3.0v
28
SIM1_CLK
O
SIM card clock line
29
SIM1_RST
O
SIM card reset line
30
SIM1_DATA
I/O
SIM card data cable
Parameters
Conditions
Min
Type
Max
Unit
VSIM1
SIM 3V
2.7
2.85
2.95
V
SIM 1.8V
1.65
1.8
1.95
V
Pin
Signal Name
Signal I/O
Description
50
UTXD2
O
DCE Data Transmit
51
URXD2
I
DCE Data Receive
67
URXD1
I
DCE Debug serial Data Receive
68
UTXD1
O
DCE Debug serial Data Transmit