Installation Instructions
Table Of Contents
- Contents
- List of Table
- List of Figures
- 1 About this document
- 2 Product Overview
- 3 Mechanical Dimensions
- 4 Interface description
- 4.1 Pin Definition
- 4.2 Operating conditions
- 4.3 Digital logic characteristics
- 4.4 Power interface
- 4.5 USIM card interface
- 4.6 PCM interface
- 4.7 USB2.0 interface
- 4.8 UART interface
- 4.9 SPI interface
- 4.10 I2C interface
- 4.11 Network light
- 4.12 System Status Indication
- 4.13 Flight Mode
- 4.14 Forced USB download interface
- 4.15 SD card interface
- 4.16 SDIO_WIFI/EMMC interface
- 4.17 PCIe interface
- 4.18 RMII/RGMII interface
- 4.19 AUDIO interface
- 4.20 ADC
- 4.21 GPIOs
- 4.22 Power on/off and reset interface
- 4.23 Antenna interface
- 5 Product characteristics
- 6 Design Guideline
- 7 Storage, Production and Package
- 8 Safety Information
- 空白页面
- 空白页面
L508 Hardware Design
Copyright© Shanghai Mobiletek Communication Ltd 41
18 USIM_RST SIM reset control
USIM card reset signal, output by the
module, support 1.8v/3v dual voltage range.
19 USIM_CLK SIM clock
USIM card clock signal, output by the
module, supports 1.8V/3V dual voltage
range.
53 USIM_CD USIM hot-plug detection Only 1.8 v Range is supported.
Note: L508 SIM Card Channel Signals support dual-level mode, the module will automatically adapt
to the type of External Sim card jump.
4.5.2 Electrical characteristics
The USIM Card Signal Unit, on the line near the USIM card seat, please note the need to add ESD
protection devices when designing.
In order to meet the requirements of 3GPP TS 51.010-1 protocol and EMC certification, it is
recommended that the seat of the USIM card should be placed near the interface of the module USIM
card, so as to avoid the serious distortion of the waveform caused by the long line and the influence
of the Signal integrity. USIM and USIM signal routing recommendations packet earth protection. A
100nF and a 33pF capacitor are connected in parallel between the GND and the SIM_VDD. A 22pF
capacitor is connected in parallel between the USIM, USIM, USIM and the GND to filter out
interference from the RF signal. USIM, USIM, USIM series 22 resistance to enhance static protection.
4.5.3 USIM card interface application