Wakeup Out; Vref Power-Up Timing; Vref Specifications - Motorola 8900 - Blackberry Curve Cell Phone OEM Car Charger Developer's Manual

Important:
Figure 2-23
Figure 2-23: VREF Power-up Timing
Table 2-20

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 C24 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
December 15, 2008
The VREF regulator is powered from the C24's main power supply, and therefore
any current sourced through this regulator originates from the C24 VCC supply. The
overall VCC current consumed by C24 is directly affected by the VREF operation.
The C24 current consumption rises with respect to the current sourced through
VREF.
shows the VREF power-up timing.
gives the VREF specifications.
Table 2-20: VREF Specifications
Parameter Conditions
V I < 150 mA
OUT OUT
I
OUT
Load regula-
tion
Line regula-
tion
PSRR 20 Hz - 20 kHz
C24 Module Hardware Description
Chapter 2: Hardware Interface Description
Min Typ Max Unit
-4% 2.8 +4% V
150 mA
0.65 mV/
mA
2.8 mV
21 dB
41