Motorola G24 - Standby Mode; Active Mode

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