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Single touch EQ on/off switch with IQS127D
Single touch EQ on/off switch with IQS127D
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Old 20th November 2019, 09:08 PM   #1
Hicoco is offline Hicoco  France
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Single touch EQ on/off switch with IQS127D
Default Single touch EQ on/off switch with IQS127D

Did somebody use the IQS127D, Single Channel Capacitive Proximity/Touch Controller?
I need some advise, i would like to be sure that i will calculate the right value Rb value for the BC327 of my switching circuit. I am little confused with the Datasheet, IQS127D sink current for Tout is 1mA and for Pout 3mA, is that correct?
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Old 20th November 2019, 09:34 PM   #2
PRR is offline PRR  United States
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Yes, it is odd the P and T outputs have different max ratings.

More important: what LOAD is the BC327 expected to drive? You need more than enough base current to saturate the BC327 into the load it drives. I don't have BC327 specs memorized, and I have no idea what your load is.
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Old 20th November 2019, 09:41 PM   #3
Hicoco is offline Hicoco  France
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Single touch EQ on/off switch with IQS127D
Thank, PRR.
My load is a EC2-5NU 178ohm 28mA. so if 1mA is correct. 5k should be enought to saturate the BC327
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Old 21st November 2019, 03:29 AM   #4
PRR is offline PRR  United States
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OK.
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