Product Info

LPWA Module Series
BG95 Series Hardware Design
BG95_Series_Hardware_Design 57 / 106
VIL ≤ 0.45 V
VBAT
PWRKEY
500–1000 ms
NOTE
VDD_EXT
About 30 ms
USB_BOOT
Pull up USB_BOOT to external 1.8 V/VDD_EXT before
the module power up to force the module into emergency
download mode.
Figure 24: Timing of Turning on Module with USB_BOOT
1. It is recommended to reserve the above circuit design during application design.
2. Please make sure that VBAT is stable before pulling down PWRKEY. It is recommended that the time
between powering up VBAT and pulling down PWRKEY is no less than 30 ms.
3. When using MCU to control the module entering emergency download mode, please follow the above
timing sequence. Connecting the test points as shown in Figure 23 can manually force the module to
enter download mode.
3.17. ADC Interfaces
The module provides two analog-to-digital converter (ADC) interfaces but only one ADC interface can be
used at a time. ADC1 connects directly to ADC0 inside the module.
AT+QADC=0 command can be used to read the voltage value on the ADC being used. For more details
about the AT command, see document [2].
In order to improve the accuracy of ADC voltage values, the trace of ADC should be ground surrounded.
NOTES