Standby Mode; Active Mode - Motorola G24 Developer's Manual

The VREF regulator incorporates 2 operating modes that may be controlled by AT command.
These modes define the VREF operating state relative to the G24's operating mode.
Figure 2-26
Figure 2-26: VREF Power-up Timing

Standby Mode

The Standby operating mode is the default mode when G24 powers on. In this mode VREF
follows the G24's operating mode.
When the G24 is in low power mode, SLEEP mode, the VREF regulator is also in a low power
state. In its low power state the VREF regulated output is limited to providing only 2 mA of
current maximum.
When G24 is not in low power mode, or wakes up temporarily from low power mode, the VREF
regulator returns to full operation, supplying up to 200 mA.

Active Mode

In this mode the VREF regulator is always fully active while G24 is operating, regardless of the
G24 operating mode.
Table 2-21
January 1, 2006
shows the VREF power-up timing.
gives the VREF specifications.
Table 2-21: VREF Specifications
Parameter Conditions
V I = 200 mA
OUT OUT
I Active mode
OUT
Standby mode
Load regula-
tion
Module Hardware Description
Chapter 2: Hardware Interface Description
Min Typ Max Unit
-3% 2.75 +3% V
50 200 mA
2
0.27 mV/
mA
45