Service Guide
Table Of Contents
- Safety Information
- About the Document
- Contents
- Table Index
- Figure Index
- 1 Introduction
- 2 Product Overview
- 3 Operating Characteristics
- 4 Application Interfaces
- 5 Antenna Interfaces
- 6 Electrical Characteristics and Reliability
- 7 Mechanical Information and Packaging
LTE-A Module Series
EM060K-GL&EM120K-GL_Hardware_Design 37 / 78
When the (U)SIM is absent, CD1 is open from CD2 and USIM_DET is at high level.
When the (U)SIM is inserted, CD1 is short-circuited to ground and USIM_DET is at low level.
The following figure shows a reference design of (U)SIM interface with a normally open (U)SIM card
connector.
Module
(U)SIM Card
Connector
USIM_DET
USIM_DATA
USIM_CLK
RST
CLK
CD1
IO
USIM_VDD
USIM_VDD
USIM_RST
VCC
GND
VPP
GND
TVS array
10-20k
22R
22R
22R
33 pF
33 pF
33 pF
100 nF
0R
CD2
NOTE:
All these resistors, capacitors and ESD should be close to (U)SIM card connector in PCB layout.
Figure 15: Reference Circuit for Normally Open (U)SIM Card Connector
4.1.5. (U)SIM Card Connector Without Hot-Plug
If the (U)SIM card detection function is not needed, please keep USIM_DET unconnected. A reference
circuit for the (U)SIM card interface with a 6-pin (U)SIM card connector is illustrated by the following
figure.
Module
(U)
SIM Card
Connector
USIM_DET
USIM_DATA
USIM_CLK
RST
CLK
IO
USIM_VDD
USIM_VDD
USIM_RST
VCC
GND
VPP
GND
TVS array
Note: All these resistors, capacitors and TVS array should be close to (U)SIM card connector in PCB
layout.
10-20K
22R
22R
22R
33 pF
33 pF
33 pF
100 nF
Figure 16: Reference Circuit for a 6-Pin (U)SIM Card Connector