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Important:
Table 2-13
Wakeup
For a detailed description regarding Wake up signal interface, please refer to
on page
Antenna Detection
The W24 incorporates an internal antenna detection circuit, which senses the physical connection
and removal of a Wi-Fi antenna, as well as the cellular antenna, in case that a cellular module like
G24 is stacked on the W24.
In case of stacked configuration (W24 + G24), a removal of a single or both of the modules
antennas, will cause the antenna detect indicator to be set Low.
The antenna detection state is reported to the application through the ANT_DET output signal,
and may also be queried by the AT+iRP19 command.
The detection circuit senses DC resistance to ground on the G24 antenna connector.
A DC resistance below 100kohm (+10%) is defined as a valid antenna connection, and the
ANT_DET output signal is set high.
GPRS/EGPRS Detection
This signal is routed from the 70-pin host connector to G24 70-pin connector via W24. It is not
internally connected to W24 circuits. If the W24 will be used as stand alone only, this signal pin
should be left open.
May 31, 2008
The VREF regulator is powered from the W24's main power supply, and therefore
any current sourced through this regulator originates from the W24 VCC supply.
The overall VCC current consumed by W24 is directly affected by the VREF
operation. The W24 current consumption rises with respect to the current drawn
from VREF.
gives the VREF specifications.
Table 2-13: VREF Specifications
Parameter
Conditions
V
I
OUT
OUT
I
Active mode
OUT
Load regula-
I
OUT
tion
100 mA
Line regula-
Vin = Vcc
tion
I
OUT
17, paragraphs
"Using the WKUPI_N signal"
Module Hardware Description
Chapter 2: Hardware Interface Description
Min
Typ
= 150 mA
2.7
2.8
-
= 1.0 mA to
2
1
= 1.0 mA
and
"Using the WKUPO_N signal"
Max
Unit
2.9
V
100
mA
15
mV
10
mV
"Low Power Mode"
.
29
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