參數(shù)資料
型號: MAX6954APL
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 顯示驅動器
英文描述: 4-Wire Interfaced, 2.7V to 5.5V LED Display Driver with I/O Expander and Key Scan
中文描述: LED DISPLAY DRIVER, PDIP40
封裝: PLASTIC, DIP-40
文件頁數(shù): 29/38頁
文件大?。?/td> 395K
代理商: MAX6954APL
M
4-Wire Interfac ed, 2.7V to 5.5V LED Display
Driver with I/O Expander and K ey S c an
______________________________________________________________________________________
29
REGISTER DATA
D4
MODE
ADDRESS
CODE (HEX)
D7
D6
D5
D3
D2
D1
D0
GPIO
Configuration
Register
PORT ALLOCATION OPTIONS
0 Keys Scanned
8 Keys Scanned
16 Keys Scanned
24 Keys Scanned
32 Keys Scanned
EXAMPLE PORT CONFIGURATION SETTINGS
No Keys
Scanned, P4 and
P2 Are Outputs,
Others Are Inputs
8 Keys Scanned,
P3 and P1 Are
Outputs, P2 Is an
Input
32 Keys
Scanned, No
GPIO Ports
0x06
Set number of keys scanned
Set port direction for ports P0 to P4:
0 = output, 1 = input
0x06
0x06
0x06
0x06
0x06
0
0
0
0
1
0
0
1
1
X
0
1
0
1
X
P4
IRQ
IRQ
IRQ
IRQ
P3
P3
P3
P3
P2
P2
P2
P1
P1
P0
Key_A
Key_A
Key_A
Key_A
Key_B
Key_B
Key_B
Key_C
Key_C
Key_D
0x06
0
0
0
0
1
0
1
0x06
0
0
1
X
0
1
0
X
0x06
1
X
X
X
X
X
X
X
Table 32. Port Configuration Register Format
REGISTER DATA
WITH APPROPRIATE SWITCH NAMED BELOW
KEY
MASK
REGISTER
ADDRESS
CODE
(HEX
D7
D6
D5
D4
D3
D2
D1
D0
Key_A Mask
Register
0x08
SW_A7
SW_A6
SW_A5
SW_A4
SW_A3
SW_A2
SW_A1
SW_A0
Key_B Mask
Register
0x09
SW_B7
SW_B6
SW_B5
SW_B4
SW_B3
SW_B2
SW_B1
SW_B0
Key_C Mask
Register
0x0A
SW_C7
SW_C6
SW_C5
SW_C4
SW_C3
SW_C2
SW_C1
SW_C0
Key_D Mask
Register
0x0B
SW_ D7
SW_D6
SW_D5
SW_D4
SW_D3
SW_D2
SW_D1
SW_D0
Table 33. Key Mask Register Format
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