How to Measure TCUT1300X01 IC Output

[bjt17]

i have use TCUT1300X01 Dual Channel Transmissive Optical Sensor with Phototransistor Outputs Ic in my Project.
at TP2 and TP19 i have given 3V supply and i will check output at TP20. But at TP20 output not observed.

Please suggest solution for the same ..
please find attached schematic file.

Regads
bjt17

 

[std_match]

Verify that you have about 1.8V across R28.

What voltage do you have across R2 ?
If it isn't zero when the light is blocked, the R2 value of 100 kOhm is probably too high. I would change it to 10 kOhm anyway.
If you have zero Volt across R2 when the light isn't blocked, you have probably made a mistake with some connection.

 

[bjt17]

i verified voltage across R28 is 3V. and voltage across R2 is 0V.
i made connection is correct.

 

[KlausST]

Hi,

If there is 3V across R28 then
* either R28 is broken = high ohmic,
* or the solder pads 1 and 3 of the optical sensor (A and K) are short circuit.

Datasheet says 0.6mA as typical output current. Use Ohm's law to calculate a useful load resistor value.
It does not need to be perfectly 0.6mA, but at least in the range of 0.2mA ... 2mA.

Klaus

 

[bjt17]

Hi,
Resistor R28 is not broken. also i will check no short on optical sensor (A and K).

As per 0.6mA as typical output current. i will select load resistor value accordingly (R2- 20K)