Use Instructions
Table Of Contents
- 1 About this document
- 2 Product Overview
- 3 Interface Description
- 3.1 PIN Definition
- 3.2 Operating condition
- 3.3 Digital I/O characteristics
- 3.4 Power Interface
- 3.5 UIM interface
- 3.6 PCM interface(TBD)
- 3.7 USB2.0 interface
- 3.8 UART Interface
- 3.9 Power on/off and reset interface
- 3.10 Interactive interface
- 3.11 Net Light interface
- 3.12 System boot configuration and download
- 3.13 Analog and Digital conversion (ADC) interface
- 3.14 I2C interface
- 3.15 SPI interface
- 3.16 Antenna interface
- 4 Product characteristics
- 5 Design guideline
- 6 Manufacturers
- 7 Package Storage information
- 8 Safety Information
L710HG Hardware Design
23
USIM_VDD LDO power output
1.75 1.8 1.95 V
VIH High-level input voltage
0.65·USI
M_VDD
-
USIM_V
DD +0.3
V
VIL Low-level input voltage
-0.3 0
0.35·USI
M_VDD
V
VOH High-level output voltage
USIM_V
DD -0.45
--
USIM_V
DD
V
VOL Low-level output voltage
0 0 0.45 V
3.5.2 Design Guide
In order to meet the 3 GPP TS 51.010 1 protocol and EMC certification requirements. Suggest UIM
slot near the location of the module USIM card interface, to avoid running for too long, lead to serious
deformation of waveform and effect signal integrity, UIM_CLK and UIM_DATA signal lines suggest
ground protect. Between the UIM VCC & GND add a 1uF and a 33 pF capacitor in parallel, Between
the SIM_CLK& GND, UIM_RST& GND, UIM DATA& GND add a 33 pF capacitor in parallel, for
filter the RF signal interference.
3.5.3 UIM interface reference circuit
VCC
R8
C2
RST
CL K
DATA
DETECT
R9
R10
R11
C3 C4
VPP
USIM_VDD
USIM_RST
USIM_DATA
USIM_PRE SENT
USIM_CLK
R12
C5 C6
22R
22R
22R
1K
NC
NCNCNC
ESD
1UF 100NF
MODULE
SIM
GND
Figure 3-6 UIM Reference circuit
Note: UIM_DATA have added the pull-up resistance in the module design.