Technical Specs
Table Of Contents
- Important Notice
- Safety and Hazards
- Limitation of Liability
- Contents
- List of Tables
- List of Figures
- 1: Introduction
- 2: Electrical Specifications
- 3: RF Specifications
- 4: Power
- 5: Software Interface
- 6: Mechanical and Environmental Specifica- tions
- 7: Regulatory Compliance and Industry Certifi- cations
- A: Antenna Specification
- B: Design Checklist
- C: Testing
- AT Command Entry Timing Requirement
- Acceptance Testing
- Certification Testing
- Production Testing
- Functional Production Test
- Quality Assurance Testing
- Suggested Testing Equipment
- Testing Assistance Provided by Lantronix, Inc.
- IOT/Operator Testing
- Extended AT Commands for Testing
- D: Packaging
- E: References
- F: Acronyms
Rev 5 May.21
51
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Power
Table 4-6:
USB 2.0 Power-On / Off Timing Parameters (Double Enumeration)
Parameter Typical (s) Maximum (s)
t_pwr_on_seq 0.8 0.9
t_USB_active 0.12 0.2
t_USB_suspend 8.5 11
t_pwr_off_seq 21.4 25
Table 4-7:
USB 2.0 Power-On / Off Timing Parameters (Single Enumeration)
Parameter Typical (s) Maximum (s)
t_pwr_on_seq 8.7 11
t_pwr_off_seq 21.4 25
Table 4-8:
USB 3.0 Power-On / Off Timing Parameters (Single Enumeration)
Parameter Typical (s) Maximum (s)
t_pwr_on_seq 8.6 11
t_pwr_off_seq 21.5 25
USB Enumeration
The unit supports single and double USB enumeration with the host:
•
Single enumeration:
·
Enumeration starts within maximum t_pwr_on_seq seconds of power-on.
•
Double enumeration—As shown in Figure 4-2:
·
First enumeration starts within t_pwr_on_seq seconds of power-on (while USB_D+
is high)
·
Second enumeration starts after t_USB_suspend (when USB_D+ goes high again)
Reset Timing
To reset the module, refer to Table 2-7 on page 33 for RESET# signal usage instructions.
Required Shutdown Sequence
Warning: To avoid causing issues with the file system, follow this shutdown sequence.
1.
Drive Full_Card_Power_Off# low.
2.
Wait for at least t_pwr_off_seq seconds.
3.
Remove power.