Product Info
Table Of Contents
- About the Document
- Contents
- Table Index
- Figure Index
- 1Introduction
- 2Product Concept
- 3Application Interfaces
- 3.1.General Description
- 3.2.Pin Assignment
- 3.3.Pin Description
- 3.4.Power Supply
- 3.5.Turn on and off Scenarios
- 3.6.VRTC Interface
- 3.7.Power Output
- 3.8.Battery Charge and Management
- 3.9.USB Interface
- 3.10.UART Interfaces
- 3.11.(U)SIM Interfaces
- 3.12.SD Card Interface
- 3.13.GPIO Interfaces
- 3.14.I2C Interfaces
- 3.15.ADC Interfaces
- 3.16.Motor Drive Interface
- 3.17.LCM Interface
- 3.18.Touch Panel Interface
- 3.19.Camera Interfaces
- 3.20.Sensor Interfaces
- 3.21.Audio Interfaces
- 3.22.Emergency Download Interface
- 4Wi-Fi and BT
- 5GNSS
- 6Antenna Interface
- 7Electrical, Reliability and Radio Characteristics
- 8Mechanical Dimensions
- 9Storage, Manufacturing and Packaging
- 10Appendix A References
- 11Appendix B GPRS Coding Schemes
- 12Appendix C GPRS Multi-slot Classes
- 13Appendix D EDGE Modulation and Coding Schemes
Smart LTE Module Series
SC20 Hardware Design
SC20_Hardware_Design Confidential / Released
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UART1 provides 1.8V logic level. A level translator should be used if customers’ application is equipped
with a 3.3V UART interface. A level translator TXS0104PWR provided by Texas Instruments is
recommended. The following figure shows the reference design.
Figure 15: Reference Circuit with Level Translator Chip (for UART1)
The following figure is an example of connection between SC20 and PC. A voltage level translator and a
RS-232 level translator chip are also recommended to be added between the module and PC, as these
two UART interfaces do not support the RS-232 level, while support the 1.8V CMOS level only.
Figure 16: RS232 Level Match Circuit (for UART1)
UART2 is similar to UART1. Please refer to UART1 reference circuit designs for UART2’s.
NOTE