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1.6 System function interfaces
1.6.1 Module reset
You can reset (reboot) the ODIN-W2 series modules using one of the following methods:
•
Hardware reset: Low level on the RESET_N pin, which is normally set high by an internal pull-up, for a
valid time period (see ODIN-W2 series Data Sheet [2]). This causes an "external" or "hardware" reset of
the module. The RESET_N line should be driven by open drain, open collector or contact switch.
•
Software reset with an AT command: This causes an "internal" or "software" reset of the module.
See ODIN-W2 AT Commands Manual [1] for more information.
1.6.2 External low power clock for power saving modes
An external 32.768 kHz Low Power Clock (LPO) is required for using the power saving modes. See the ODIN-W2
AT Commands Manual [1] for more information about the different power saving modes. The clock must be
available during start-up (after power on or while leaving the reset-state).
See the Low power clock (LPO_CLK) design section for more information about external LPO clock design. The
LPO clock should be left unconnected if not needed in the design. See ODIN-W2 series Data Sheet [2] for
electrical requirements.
1.6.3 System input and output signals
The module can be in Command mode, Data mode, and Extended Data mode and the RED, GREEN, BLUE and
UART DTR signals are used to detect or indicate the status. See ODIN-W2 AT Commands Manual [1] for more
information about the modes.
Table 4 describes the default setup of the System IOs - RED, GREEN and BLUE. For more information on the pins
see Pin description section.
Mode
Data mode, EDM
Command mode
Data mode, Command mode,
EDM
Data mode, Command mode,
EDM
Table 3: LED Signal states in different module modes
The UART_DTR pin can be set to indicate if the module is in Data mode (Low) or Command mode (High) or
indicate if there are any modules connected to the module (Low if at least one module is connected). It can also
be set to always low.
The UART_DSR pin can be set put the module in Command mode (Low to High transition will set the module in
Command mode if not already there) or it can be used to disconnect all remote pears.
For more information, see the ODIN-W2 AT Commands Manual [1].
1.6.4 Restoring default configuration
In some situations, it is necessary to restore the settings to their default values. The following two levels of
restore to default configuration can be activated through hardware:
•
Serial Settings: The serial settings are restored to default serial settings if the level on the SWITCH_1
pin is low during start-up. See the table in the Universal asynchronous serial interface (UART) section for
more information about the default serial settings.
2
On data activity, the active LED flashes.
UBX-14040040 - R03
Status
RGB LED Color
IDLE
Green
IDLE
Orange
CONNECTING
2
Purple
CONNECTED
2
Blue
Advance Information
ODIN-W2 series - System Integration Manual
GREEN GPIO
BLUE GPIO
LOW
HIGH
LOW
HIGH
HIGH
LOW
HIGH
LOW
RED GPIO
HIGH
LOW
LOW
HIGH
System description
Page 10 of 33
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