Chapter 2: Hardware Interface Description
May 31, 2008 Module Hardware Description 9
Operating Modes

W24 incorporates several operating modes. Each operating mode is different in the active

features and interfaces.

Table 2 -1 summarizes the general characteristics of the W24 operating modes and provides

general guidelines for operation.

Table 2-1:W24 Operating Modes

Mode Description Features
Not Powered VCC supply is disconnected. The W24 is Off.
Any signals connected to the interface con-
nector must be set low or tri-state.
Powered off Valid VCC supply. All W24 voltage regula-
tors are disabled.
The W24 Interfaces and circuits are powered
down. Only the power up/down control cir-
cuit is monitoring the IGN and ON_N sig-
nals. Any signals connected to the interface
connector must be set low or tri-stated.
Off-mode Valid VCC supply. W24 powered down by
ON_N, while IGN set high. All W24 voltage
regulators are active.
The W24 Interfaces and circuits are powered
down. The CPU is running at 32kHz and
monitoring IGN and ON_N signals. Any sig-
nals connected to the interface connector
must be set low or tri-stated.
Sleep RESET_N signal is high.
CTS_N signal is disabled.
The W24 is in low power mode.
The application interfaces are disabled, but,
W24 continues to monitor the Wi-Fi network.
Deep Sleep RESET_N signal is high.
CTS_N signal is disabled.
The W24 enters deep sleep mode if it cannot
find an AP that it can register to. It wakes up
periodically to rescan and try to register. If
the AP is found, it exits the deep sleep mode.
If the AP cannot be found/registered to, it
goes back to deep sleep mode - during that
time it disables the RF section and does not
monitor the Wi-Fi network.
Idle RESET_N signal is disabled (high).
CTS_N and DSR_N signals are enabled
(low).
The W24 is fully active, connected to the
Wi-Fi network and ready to communicate.
This is the default power-up mode.
Airplane RF block disabled. The W24 interfaces are fully active, but its
RF section is disabled.
Tx RESET_N signal is high.
TXEN_N signal is toggling.
A Wi-Fi data transmission is in progress.
When data transmission terminates, W24
returns to the last operating state (Idle or
Sleep).