Video

DAC

1.8VDAC

0.5VV

REF

Two-Pole

Filter

Shutdown

Control

+

75W

1.8V

Pull-up

10kW

100kW

(2)

3750W

(Seenote1)

G=5.2V/V

75W

TVDetect

TVDetect

GPIO

(3)

GPIO

OMAP3430

OPA362

TWL92230

872W

RegulatorV

AUX

2.5Vor2.8V

10mV

R

SET

+In

Out

V+

GND

Enable

OPA362

(1)

Closed when enabled during normal operation; open when shut down.

(2)

Protects GPIO against overvoltage conditions during active video transmission.

(3)

GPIO must be able to generate interrupt.

Figure 27. Using TV-Detect Signal to Disable/Enable the OPA362

Disabling the OPA362 also disconnects the internal

•

Automatic video start by polling the video line

feedback resistor path to GND, and therefore there is

periodically.

no current flowing from the logic supply through the

•

Automatic

video

stop

if

the

TV

(or

other

pull-up resistor to GND if no video load is connected;

equipment) is disconnected.

this architecture helps to conserve battery life. The

Proper implementation allows to significantly simplify

typical leakage when the output is pulled high and

the

user

interface.

For

more

information,

see

OPA362 is disabled is approximately 300pA.

Application

Report

SBOA109, OPA361

and

TV

The following functionality can be achieved by

Detection, available for download at www.ti.com.

implementing TV-detection:

12

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