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3.
3
Control Interfaces
This section describes the power on/off, wake-up, and reset interface for controlling
the module.
3.3.1 Power-On Signal
This function is not available in the present firmware; the module will be turned on
automatically when the power supply exists. Set this pin as “floating” or use 0 Ω as a
reserve.
3.3.2 Wake-Up Interface(
TBD)
3.3.3 Reset Signal
The Reset Signal is a hardware reset signal to control the system reset directly. You
can connect it to a key or a control signal. Reserve a 100k resistor to pull up to VREF
and maintain a sufficient physical distance between the reset signal trace and noise
and radiating signals on the PCB.
3.
4
UART Interface
There are two UART interfaces: a 4-bit for high-speed data transfer, and the UARTs.
Definitions of the IMA2 are listed below.
1. UART0 for PPP and AT
2. UART2 for firmware download, recovery mode, and firmware
debug view
Figure 3-1. UART connection (example)
