UMTS/HSPA+ Module Series
UG89 Hardware Design
UG89_Hardware_Design 35 / 73
The transistor circuit solution is not suitable for applications with baud rates exceeding 460Kbps.
3.8. (U)SIM Interface
The (U)SIM interface circuitry meets ETSI and IMT-2000 SIM interface requirements. Both 1.8V and 3.0V
(U)SIM cards are supported.
Table 14: Pin Definition of the (U)SIM Card Interface
UG89 supports (U)SIM card hot-plug via the USIM_DET pin. The function supports low-level and high-
level detections. By default, it is disabled and can be configured via
AT+QSIMDET
. Please refer to
document [2]
for details about the command.
The following figure shows a reference design for (U)SIM interface with an 8-pin (U)SIM card connector.
Pin Name Pin No.
I/O
Description
Comment
USIM_DET
17
DI
(U)SIM card hot-plug detect
1.8V power domain.
If unused, keep it open.
USIM_VDD
21
PO
Power supply for (U)SIM card
Either 1.8V or 3.0V (U)SIM card is
supported and can be identified
automatically by the module.
USIM_DATA
18
IO
(U)SIM card data
USIM_CLK
22
DO
(U)SIM card clock
USIM_RST
16
DO
(U)SIM card reset
NOTE