Quectel EG91 Series Hardware Design page 58
Lte standard module
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Also See for EG91 Series:
- Hardware design (98 pages) ,
- Hardware design (94 pages) ,
- Hardware design (109 pages)
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NOTE
1.
Make sure that VBAT is stable before pulling down PWRKEY pin. It is recommended that the time
between powering up VBAT and pulling down PWRKEY pin is no less than 30 ms.
2.
When using MCU to control module to enter the emergency download mode, follow the above timing
sequence. It is not recommended to pull up USB_BOOT to 1.8 V before powering up VBAT. Short the
test points as shown in Figure 28 can manually force the module to enter download mode.
EG91_Series_Hardware_Design
Figure 29: Emergency Download Mode Timing
LTE Standard Module Series
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