User's Manual
Table Of Contents
- 1. Introduction
- 2. General Description
- 3. Simplified Block Diagram
- 4. Key Features
- 5. Product Specifications
- 6. Application Interface
- 7. Mounting the Module onto the Application Board
- 8. Package
- 9. Terms and Abbreviations
Neo_M680 Hardware User Guide V1.0
Copyright Neoway Techlology Co., Ltd. Page 17 of 31
independent power, like a DC/DC or LDO.
The inductor used in Reference Design (b), should be a power inductor and have a very low
resistance. The value of 10uH, with average current ability>1.2A and low DC resistance, is
recommended.
Figure 8 Using separated power supply for module
Never use a diode to make the drop voltage between a higher input and module power. It will
obviously decrease the module performances, or result in unexpected restarts, due to the forward
voltage of diode will vary greatly in different temperature and current.
6.1.2.3 EMC Considerations for Power Supply
Place transient overvoltage protection components like TVS diode on power supply, to absorb the
power surges. SMAJ5.0A could be a choice.
6.1.2.4 Power-on Sequence
Prior to turning on the module, turn on the host MCU and finish the UART initialization. Otherwise
conflictions may occur during initialization, due to unstable conditions.
6.2 ON/OFF Procedure
ON/OFF is a low level pulse active input, used to turn on or off the module.