Tool/software:
Hi, TI expert
There is an inquiry from a customer to recommend a replacement product due to a touch operation error in TSC2007-Q1.
The current touch operation problems of TSC2007-Q1 are as follows.
[Problem]
1) If you initially turn on the power and immediately press the touch button, “the touch does not work”
2) Upon verification, even when connecting a pull-up resistor of 4.7kΩ to the SDL pin of TSC2007-Q1, the output remains set to low, causing the touch functionality to be completely non-operational until the power is reset.
Customer was able to check the error information about the "TSC2007-Q1" Touch IC in TI _E2E, and it seems to suggest a way to prevent it by using a product with a RESET IC or supplying power separately.
Once TSC2007-Q1 is set to output low, it is impossible to release it through S/W until the power is turned off and on.
The shorter the duration of the power cycle, the more frequently this issue occurs. Even if the TWI is initialized 1 second after powering on, the problem persists.
Trying to change the pullup resistor and try various other methods just in case, but there is no way once SCL goes low.
It doesn't happen every time, but it happens when the power is turned on, so there seems to be some condition before turning the power on, and I think that needs to be resolved.
Q1) Is there any way to solve the above problem?
Q2) Could you recommend an equivalent part to replace TSC2007-Q1 that does not have the above problem?
Please check. Thanks.
[Applied Schematic]
