參數(shù)資料
型號: TPS65920A2ZCHR
廠商: TEXAS INSTRUMENTS INC
元件分類: 消費(fèi)家電
英文描述: SPECIALTY CONSUMER CIRCUIT, PBGA139
封裝: 10 X 10 MM, 0.65 MM PITCH, GREEN, PLASTIC, NFBGA-139
文件頁數(shù): 97/115頁
文件大?。?/td> 1232K
代理商: TPS65920A2ZCHR
Device
Keyboardcontroller
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
6x6
Keyboardmatrix
037-014
SWCS037G
– MAY 2008 – REVISED APRIL 2011
10
Keyboard
10.1 Keyboard Connection
The keyboard is connected to the chip using:
KBR (5
:0) input pins for row lines
KBC (5
:0) output pins for column lines
Figure 10-1 shows the keyboard connection.
Figure 10-1. 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)
are 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 6
× 6. To use a 3 × 3 keyboard,
KBR(4) and KBR(5) must be tied high to prevent any scanning process distribution.
82
Keyboard
Copyright
2008–2011, Texas Instruments Incorporated
focus.ti.com: TPS65930/TPS65920
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