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TPS65921 Datasheet(PDF) 52 Page - Texas Instruments |
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TPS65921 Datasheet(HTML) 52 Page - Texas Instruments |
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52 / 58 page  Device Keyboard controller kbd_r_0 kbd_c_0 VCC Internal pullup kbd_r_1 kbd_r_2 kbd_r_3 kbd_r_4 kbd_r_5 kbd_c_1 kbd_c_2 kbd_c_3 kbd_c_4 kbd_c_5 kbd_r_6 kbd_r_7 kbd_c_6 kbd_c_7 8 x 8 Keyboard matrix SWCS048-028 TPS65921 SWCS048F – MARCH 2010 – REVISED MARCH 2012 www.ti.com Figure 26. Keyboard Connection 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. Any action on a button generates an interrupt to the sequencer. The decoding sequence is written to allow detection of simultaneous press actions on several key buttons. The keyboard interface can be used with a smaller keyboard area than 8 × 8. To use a 6 × 6 keyboard, KBR(6) and KBR(7) must be tied high to prevent any scanning process distribution. 52 Submit Documentation Feedback Copyright © 2010–2012, Texas Instruments Incorporated Product Folder Link(s): TPS65921 |
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