STMPE1601 datasheet(40/58 Pages) STMICROELECTRONICS

40 / 58 page

Keypad controller

STMPE1601

40/58

corresponding column input will become 'low' after making contact with the 'low' voltage on

its corresponding row output.

Once the keyscan controller senses a 'low' input on any of the column inputs, the scanning

cycles will then start to determine the exact key that has been pressed. The twelve row

outputs will be driven 'low' one by one during each scanning cycle. While one row is driven

'low', all other rows are in tri-state and pulled up. If there is any column input sensed as 'low'

when a row is driven 'low', the key scan controller will then decode the key coordinates (its

corresponding row number and column number), save the key data into a de-bounce buffer

if available, confirm if it is a valid key press after de-bouncing, and update the key data into

output data FIFO if valid.

12.1

Keypad configurations

The keypad controller supports the following types of keys:

●

Up to 8 input * 8 output matrix keys

●

Up to 8 special function keys

●

Up to 4 dedicated keys

Figure 9.

Maximum configuration

STMPE1601

Matrix Keypad

(8*8)

Input 0-7

Special Function Keys

8*8 (64) Matrix Keys

8 Special Function Keys

0 Dedicated Keys

STMPE1601 数据表(PDF) 40 Page - STMicroelectronics