LPWA Module Series
BG950A-GL&BG951A-GL_Hardware_Design
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Figure 4: Sleep Mode Application via UART Interface
When the module has a URC to report, MAIN_RI* will wake up the host. See Chapter 4.6.4 for
details about MAIN_RI* behavior.
After the module is turned on, MAIN_DTR is internally pulled up by default.
AP_READY* will detect the sleep state of the host (can be configured to high voltage level or low
voltage level detection). See AT+QCFG="apready" in document [2] for details.
3.6. Recovery Mode
BG770A-GL provides the recovery mode for firmware upgrade in emergency cases. Recovery mode can
force the module to boot via debug UART interface for firmware upgrade.
The following preconditions can set the module into recovery mode.
1. Short-circuit DBG_TXD and DBG_RXD pins.
2. Drive PWRKEY low to turn on the module. In this case the module will enter recovery mode.
3. After the module enters recovery mode successfully, disconnect the connection between DBG_TXD
and DBG_RXD.
4. Upgrade firmware via debug UART interface.
1. In the design, it is recommended to reserve all the test points of the debug UART interface, and keep
DBG_TXD close to DBG_RXD.
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