TM4C123GH6PGET MCU, 32BIT, CORTEX-M4F, 80MHZ, LQFP-144,where can i connect pin for encoder incremental?

Hello Valerio

These should be connected to the QEI module which supports Quadrature with Index (3 channels). The only thing to note is the output from the encoder is 5V TLL while the device IO is 3.3V CMOS with 5V tolerance. Please do add a Low Pass Filter so that any noise that may cause a potential latch up can be eliminated

Regards
Amit

Dear Amit,

Thanks for help me!I think to use SN74LVC2T45DCTR as adapter for 5V to 3V3 input in MCU TM4C.I need to know pin for QEI module is specific pin or can i connect to any pin?So is ok for connect to QEI module any pin in MCU?

Thanks!

Best Regards!

Vale

Hello Valerio,

QEI module has specific pin to be used which is mentioned in the Signal Description section of the QEI chapter in the data sheet.

Regards
Amit

Dear Amit,
thanks again for help me,
yes in datasheet mcu i view :
PD3 (6) I TTL QEI module 0 index.
PC4 (6) I TTL QEI module 1 index.
PH4 (5) I TTL QEI module 0 phase A.
PC5 (6) I TTL QEI module 1 phase A.
PH5 (5) I TTL QEI module 0 phase B.
PC6 (6) I TTL QEI module 1 phase B.

in datasheet encoder i view

pin 2 CH-I encoder
pin 3 CH-A encoder
pin 5 CH-B encoder

Can you confirm this pin is ok?Which is right connection from my encoder to this pin mcu?
Thanks!
Best Regards!
Vale

Hello Vale,

AFAIK after reading the data sheet of the encoder the connection would be

CH-I to Index
CH-A to Phase A
CH-B to Phase B

There are 2 QEI modules (0 and 1) so basically you can connect upto 2 QEI encoders.

Regards
Amit

Dear Amit,

perfect,i try to connect in this mode.

Thanks!

Best Regards!

Vale

Hello Valerio,

Sure. But do note that besides connection the configuration of the QEI has to be done as per your application requirements and it has to be ensured that during configuration the QEI module is configured to use the Index Pulse.

Regards
Amit

Dear Amit

Thanks for help me!I sign this in schematic electric,when do fw i config QEI module in the correct mode.

Thanks!

Best Regards!

Vale

Hello Valerio

Not sure what you meant there?

Regards
Amit

Dear Amit,
I must to setting in initial requirements the frequency and type signal for signal index pulse and other signal encoder,i setting the right range of frequencies in initial requirements.i keep in mind the needs for signal index pulse and other signal in encoder in firmware for create right filter software signal when i write firmware.I think is all ok for filter hardware in input mcu,i think to connect only filter resistor/capacitor in input mcu for filter spike in signal,input mcu is ok for this signal.
Thanks again!
Best Regards!
Vale

Hello Valerio

OK, understood.

Regards
Amit