MM74C922WM replacement

Ramgopal Divakar

Expert 1145 points

Other Parts Discussed in Thread: LDC3114, LDC1314

Hello,

I am using this obsolete IC to scan a keypad. IC - MM74C922WM.

Do you carry an IC where I can read a 4 x 4 keypad?

I need the response as bits and not I2C as there is no I2C/SPI bus in this design.

Regards,

Divakar

over 1 year ago

0 Clemens Ladisch over 1 year ago

Guru 271790 points

There is no similar device. Nowadays, this is done with I²C or more often with the microcontroller.

0 Justin Beigel over 1 year ago in reply to Clemens Ladisch

TI__Mastermind 18545 points

Hello,

To add to this, we have some reference designs for keypads using our inductive sensing devices. Devices like the LDC3114 still use I2C but only need to be configured at startup and then can provide digital outputs for the button presses.

TIDA-00509 — 16-button Inductive Keypad Reference Design Using the LDC1314 Inductance-to-Digital Converter
LDC-HALL-HMI-EVM
LDC1314KEYPAD-EVM — LDC1314 inductance-to-digital converter evaluation module: 16 button keypad

Best Regards,
Justin Beigel

Interface

Interface forum

MM74C922WM replacement

LDC-HALL-HMI-EVM

LDC1314KEYPAD-EVM — LDC1314 inductance-to-digital converter evaluation module: 16 button keypad