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Document Number: 83311

6

Rev. 1.0, 31-Mar-10

TSOP75D25

Vishay Semiconductors

IR Receiver Modules for 3D

Synchronization Signals

STAND-BY MODE OF THE TSOP75D25

If an application requires an ultra low average supply current in order to save battery life, the TSOP75D25 can be operated with

an intermittent supply voltage. A typical application circuit shown in fig. 17.

Fig. 17 - Application Circuit for the TSOP75D25 with Intermittent Supply Voltage

To receive a continuous data signal while using the TSOP75D25 with an intermittent supply voltage, the receiver must be

activated in advance of the expected data frame as shown in figure 18.

Fig. 18 - Signal Timing in Power Saving Mode with Continuous Receiving Function

In normal operation without using the stand-by feature, the gain level of the TSOP75D25 returns to a default level after the device

is disconnected from supply voltage and reconnected again. A settling time of up to 100 ms is necessary until the gain has

settled to an optimum level that is well matched to the ambient noise level.

Using the device in stand-by mode, the TSOP75D25 memorizes its gain setting while in standby. On re-activation, the gain

immediately returns to the correct level present before stand-by. This operation insures that there are no spurious pulses on

power-up due to mismatch between the gain level and the ambient light conditions.

Low Power

Microcontroller

IR Receiver

(memorizing the gain

level during standby)

Input

RC data

Output

IR Rec. SBY

other input and

output lines

TSOP75D..

Battery

Supply

V

R

S

3 M

Ω

22023-2

Output signal of the

microcontroller to control the

standby mode of the IR

Receiver

The transmitted IR

synchronizing pattern

The standby is deactivated in

advance of the expected data

frame

Output signal of the TSOP75D25

Standby off

Standby on

valid sync.

pattern

Synchronizing pattern,

sent by the TV

Data is valid only 2 ms after the

standby off signal

22024-2