User's Manual
Table Of Contents
- Legal Information
- 1 About This Document
- 2 Product Overview
- 3 Interfaces
- 3.1 Definition of PINs
- 3.2 Working Condition
- 3.3 Feature of Interface Power Level
- 3.4 Power Interface
- 3.5 (U)SIM Card Interface
- 3.6 SD Card Interface
- 3.7 USB2.0 Interface
- 3.8 Serial Interface
- 3.9 JTAG (Joint Test Action Group) Interface
- 3.10 Power-on/Power-off & Reset Signal
- 3.11 Interactive Application Interface
- 3.12 LED Indicator Interface
- 4 Electric Feature
- 5 Technical Index of Radio Frequency
- 6 Related Test & Testing Standard
- 7 Design Guide
- 7.1 General Design Rule & Requirement
- 7.2 Power Supply Circuit Design
- 7.3 RF Circuit Design
- 7.4 Suggestions for EMC & ESD Design
- 7.5 Suggestions for PCB Wielding Panel Design
- 7.6 Suggestions for Heat-dissipation Design
- 7.7 Recommended Product Upgrading Plan
- 8 Manufacturing Guide
- 9 FCC Regulations:
Hardware Development Guide of Module Product
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Waiting mode: The waiting mode of SPI is a configurable low-power mode, enabled
by the byte of the control registered. In the waiting mode, if the waiting byte is
cleared, SPI works under the similar running mode. However, if SPI waits for the
position byte, SPI clock stops and enters the low-power status.
Stop mode: Under the stop mode, SPI is not available, so the power consumption is
reduced. If SPI is configured as the master equipment, any transmission process
will be s topped, but it can enter the running mode when the waiting mode stops.
Figure 3-5 is the SPI bus sequence chart.
Figure 3-5 SPI Bus Sequence Chart
3.8.2 I2C Bus
3.8.2.1 Description of PINs
I2C is the two-wire bus for the communication between ICs, which supports any IC
process (NMOS, CMOS, dual-polarity). The two signal wires, serial data (SDA) and
serial clock (SCL), can transmit information between the connected equipment.
Each equipment is identified by the unique address (such as the micro controller,
storage, LCD driver, audio DAC or keyboard interface). Due to the different
functions of the equipment, it can be used as both the sender and the receiver.