Technical information

Controls and Indicators Interface
46 G30 - Module Hardware Description December 15, 2009
Important: The VREF regulator is powered from the G30's main power supply, and therefore
any current sourced through this regulator originates from the G30 VCC supply.
The overall VCC current consumed by G30 is directly affected by the VREF
operation. The G30 current consumption rises with respect to the current sourced
through VREF.
Table 2-21 gives the VREF specifications.
VRTC
The G30 incorporates a real time block and is operated by the VRTC power located on pin 62 of
the 81-pin LGA interface, or pin 60 of the 70-pin connector interface. For detailed explanation,
refer to “Real Time Clock” on page 22.
Note: A 47uF capacitor should be connected between ground and VRTC signal (pin 62 of the
81-pin LGA interface/pin 60 of the 70-pin connector).
Wakeup Out
Some applications incorporate their own power saving mode, in which they operate with minimal
functionality, including disabling of interfaces and serial communications.
The wakeup-out (WKUPO) signal is an active low output, which is designed to support a low
power mode feature in the host application. This signal is used by G30 to indicate that it requires
to communicate with the host application through the serial interface, due to an incoming call or
data, or an unsolicited event. Applications that incorporate a low power mode should use this
signal as an indication to switch from low power mode to normal operation, and activate the serial
interface.
The wakeup-out mechanism, using the WKUPO signal, is controlled by 2 AT commands (see
Figure 2-23):
• ATS102 - Defines the delay time in milliseconds that G30 will wait, after asserting the
WKUPO signal low, before sending data on the serial interface. This delay is required to
allow the application enough time to reactivate from low power mode and switch to normal
mode.
If ATS102=0, which is the default value, the WKUPO signal and mechanism is disabled.
Table 2-21:
VREF Specifications
Parameter Conditions Min Typ Max Unit
V
OUT
I
OUT
= 30 mA -3% 2.8 +3% V
I
OUT
30 mA
Load regula-
tion
7mV
Line regula-
tion
10 mV
PSRR 50 Hz - 20 kHz 35 dB