4,199
edits
Changes
no edit summary
=== J970 connector ===
J970 is used to implement a keypad, it is connected to TPS65950. The keypad interface controller provides an enhanced keypad decode capability and simultaneously reduces host processor software overhead. When a key button of the keyboard matrix is pressed the corresponding row and column lines are shorted together. To allow key press detection, all input pins (KBR) are pulled up to VCC and all output pins (KBC) driven to a low level.<br>Any action on a button generates an interrupt to the sequencer.<br>The decoding sequence is written to allow detection of simultaneous press actions on several key buttons. More information in [http://www.ti.com/product/tps65950 TPS65950] datasheets. TPS65950 send via I2C1 all the interrupt request. Their characteristics are: <br>
{| cellspacing="1" cellpadding="1" border="1" style="width: 698px; height: 216px;"