Hi,
I'm developing a product on RL78/G22 and I'm using the touch peripheral.
I noticed that if the MCU starts running with the touch pressed, then, the "touch on" condition is never met.
Is there a way to work around this without re-starting the MCU and secure that nobody is touching the pads?
Thanks in advance.
Hello again,
I hope project is going well.
I am afraid the answer is no. Please see below:
https://www.renesas.com/us/en/document/apn/capacitive-sensor-microcontrollers-ctsu-capacitive-touch-introduction-guide
Regards
Just to be sure, so there is not an auto-tune routine that periodically checks if the behaviour is changed (the chip at startup detects its touch off condition when the finger is on, but then periodically discover that the previous condition is changed),
Thanks
The tuning is done once before the touch operations start. Have you observed anything unexpected ?
Nothing unexpected.
Ok, let me know if there is any doubt.
No doubt, but in some products (a transmitter for example) it is not always possible to tell the user to not touch the pads at startup.... I'm forced to periodically perform the startup of the device.
Yes, I understand but the parasitic capacitance of the finger cannot be eliminated.
I performed further analysis...
CASE 1: I'm working in polling mode with my touch peripheral, without using standby mode. At startup the finger is on the pad, it's not recognized. But when I release the finger and put it back it is recognized.
CASE 2: I'm working with standby mode and automatic judgment. At startup the finger is on the pad, it's not recognized. When I release the finger and put it back it is NOT recognized also, the peripheral becomes insensitive.
Since I'm developing a battery product I'm force to use standby mode (with automatic judgment).
Why this difference on the behaviour?
Have you done all the steps described on 1.1.11 ?
www.renesas.com/.../rl78-family-ctsu-module-software-integration-system
I guess so, I have no problem with automatic judgment when at startup fingers not press the pads. Can I share my project in private?
Sure.