MAX9598 Maxim Integrated Products, MAX9598 Datasheet - Page 21

• Manufacturer Part Number: MAX9598
• Description: Low-Power Audio/Video Switch
• Manufacturer: Maxim Integrated Products

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Table 4. Register Settings for Looping VCR Signals to the TV
Note 5: TV slow-switch output (bits 1 and 0) should be the same as VCR slow-switch input.
Note 6: User has to set bits 7 and 3 appropriately depending upon whether signal is red or chroma.
All circuitry is shut down in the MAX9598 except for the
I
Put the MAX9598 into low-power mode during standby.
Everything is shut down except for the slow-switching
circuits, CVBS input detection, CVBS load detection,
and I
active low whenever the slow-switch signal changes; a
CVBS signal appears or disappears; or a CVBS load
appears or disappears. The µC in the set-top box can
then decide whether to change the MAX9598 to full-
power mode and loop VCR signals to the TV.
Before entering low-power mode, the slow-switch sig-
nals should be set to high impedance.
In this mode, the MAX9598 is fully on. If interrupt is
enabled, then INT will go active low whenever the slow-
switch signal changes; a CVBS signal appears or dis-
appears; or a CVBS load appears or disappears. The
Table 5. Quiescent Power Consumption
2
Loop VCR signals to the
TV
Shutdown.
Low-power mode with slow switching, CVBS input video
detection, and video load detection active only. Audio circuitry
is off.
Full-power mode WITH input video detection and video load
detection active.
Full-power mode WITHOUT input video detection and video
load detection active (power-on default).
C interface, which is designed with static CMOS logic.
2
DESCRIPTION
C interface. If interrupt is enabled, then INT will go
Full-Power Mode with Video Input Detection
______________________________________________________________________________________
OPERATING MODE
REGISTER
and Video Load Detection
00h
01h
06h
07h
08h
09h
0Dh
10h
Low-Power Audio/Video Switch for
Low-Power Mode
7
0
0
0
0
0
1
x
Shutdown
6
0
0
0
0
0
0
0
5
0
0
0
0
0
1
0
Dual SCART Connectors
4
Default
1
0
1
0
0
1
0
BIT
µC can decide whether to change the routing configu-
ration or operating mode of the MAX9598.
This mode is similar to the above mode except that
video input detection and video load detection are not
active. If interrupt is enabled, then INT will go active low
only when the slow-switch signal changes.
The quiescent power consumption and average power
consumption of the MAX9598 are very low because of
3.3V operation and low-power circuit design. Quiescent
power consumption is defined when the MAX9598 is
operating without loads and without any audio or video
signals. Table 5 shows the quiescent power consump-
tion in all four operating modes.
Average power consumption is defined when the
MAX9598 drives typical signals into typical loads. Table 6
shows the average power consumption in full-power
mode and Table 7 shows the input and output conditions.
3
1
1
0
0
1
0
x
Full-Power Mode Without Video Input Detection
2
1
0
0
1
1
1
0
POWER CONSUMPTION (mW)
1
0
1
1
1
1
0
x
0
1
0
0
1
0
x
1
(Note 5)
(Note 6)
0.1
1.7
71
70
and Video Load Detection
Power Consumption
COMMENTS
21