Product Info

LTE Standard Module Series
EC25 Hardware Design
EC25_Hardware_Design 69 / 112
1. Please make sure that VBAT is stable before pulling down PWRKEY pin. The time between them is
no less than 30ms.
2. When using MCU to control module to enter into the forced download mode, follow the above timing
sequence. It is not recommended to pull up USB_BOOT to 1.8V before powering up the VBAT. Short
the test points as shown in Figure 31 can manually force the module to enter into download mode.
NOTES