User's Manual

Product datasheet
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other side to activate sleep mode when not needed by toggling it low.
• “WAKEUP_IN” (Host: Output, Modem: Input):
• LOW: SoC does not require the MODEM (allowing it to sleep).
• HIGH: SoC requires the MODEM or acknowledges it is ready
following a wakeup request from the MODEM.
• “WAKEUP_OUT” (Host: Input, Modem: Output):
• LOW: The MODEM does not require the Host (allowing it to sleep).
• HIGH: The MODEM requires the Host or acknowledges it is ready
following a wakeup request from the SoC.
When the IMS2 module functions as a modem, keep WAKEUP_IN high before the
system boot process is complete. After the system boot, maintain WAKEUP_IN in a
low state. The WAKEUP_IN and WAKEUP_OUT operation in host mode will be
discussed according to product specifications.
3.2.3 Reset Signal
The Reset Signal is a hardware reset signal to control the system reset directly. The
user can connect it to a key or a control signal. A low pulse after power on will reset
the module.
3.3 UART Interface
There are three UART interfaces; these interfaces are 4 bit for high-speed data
transfer, and the UART definitions of IMS2 are shown in
Figure 3-2.
1. UART0 for data
2. UART1 for debugging the DM tool and software upgrade
3. UART2 for the console
Figure 3-2. UART connection (example)