Technical information

Chapter 2: Hardware Interface Description
November 15, 2008 G24-L Module Hardware Description 43
Important: The VREF regulator is powered from the G24's main power supply, and therefore
any current sourced through this regulator originates from the G24-L VCC supply.
The overall VCC current consumed by G24-L is directly affected by the VREF
operation. The G24-L current consumption rises with respect to the current sourced
through VREF.
Figure 2-23 shows the VREF power-up timing.
Figure 2-23: VREF Power-up Timing
Table 2-21 gives the VREF specifications.
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_N) 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 G24-L 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
Table 2-21:
VREF Specifications
Parameter Conditions Min Typ Max Unit
V
OUT
I
OUT
< 150 mA -1% 2.8 +1% V
I
OUT
150 mA
Load regula-
tion
12 mV
Line regula-
tion
0.2 %/V
PSRR 20 Hz - 20 kHz 65 dB