MAX7219EWG(2003) 데이터 시트보기 (PDF) - Maxim Integrated
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MAX7219EWG Datasheet PDF : 17 Pages
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MAX7219/MAX7221
Serially Interfaced, 8-Digit LED Display Drivers
Table 7. Intensity Register Format (Address (Hex) = 0xXA)
DUTY CYCLE
D7
D6
D5
D4
D3
D2
D1
D0
MAX7219
MAX7221
1/32
(min on)
1/16
(min on)
X
X
X
X
0
0
0
0
3/32
2/16
X
X
X
X
0
0
0
1
5/32
3/16
X
X
X
X
0
0
1
0
7/32
4/16
X
X
X
X
0
0
1
1
9/32
5/16
X
X
X
X
0
1
0
0
11/32
6/16
X
X
X
X
0
1
0
1
13/32
7/16
X
X
X
X
0
1
1
0
15/32
8/16
X
X
X
X
0
1
1
1
17/32
9/16
X
X
X
X
1
0
0
0
19/32
10/16
X
X
X
X
1
0
0
1
21/32
11/16
X
X
X
X
1
0
1
0
23/32
12/16
X
X
X
X
1
0
1
1
25/32
13/16
X
X
X
X
1
1
0
0
27/32
14/16
X
X
X
X
1
1
0
1
29/32
15/16
X
X
X
X
1
1
1
0
31/32
15/16
(max on)
X
X
X
X
1
1
1
1
HEX
CODE
0xX0
0xX1
0xX2
0xX3
0xX4
0xX5
0xX6
0xX7
0xX8
0xX9
0xXA
0xXB
0xXC
0xXD
0xXE
0xXF
Table 8. Scan-Limit Register Format (Address (Hex) = 0xXB)
SCAN LIMIT
Display digit 0 only*
Display digits 0 & 1*
Display digits 0 1 2*
Display digits 0 1 2 3
Display digits 0 1 2 3 4
Display digits 0 1 2 3 4 5
Display digits 0 1 2 3 4 5 6
Display digits 0 1 2 3 4 5 6 7
REGISTER DATA
HEX
D7
D6
D5
D4
D3
D2
D1
D0
CODE
X
X
X
X
X
0
0
0
0xX0
X
X
X
X
X
0
0
1
0xX1
X
X
X
X
X
0
1
0
0xX2
X
X
X
X
X
0
1
1
0xX3
X
X
X
X
X
1
0
0
0xX4
X
X
X
X
X
1
0
1
0xX5
X
X
X
X
X
1
1
0
0xX6
X
X
X
X
X
1
1
1
0xX7
*See Scan-Limit Register section for application.
Scan-Limit Register
The scan-limit register sets how many digits are dis-
played, from 1 to 8. They are displayed in a multiplexed
manner with a typical display scan rate of 800Hz with 8
digits displayed. If fewer digits are displayed, the scan
rate is 8fOSC/N, where N is the number of digits
scanned. Since the number of scanned digits affects
the display brightness, the scan-limit register should
not be used to blank portions of the display (such as
leading zero suppression). Table 8 lists the scan-limit
register format.
Maxim Integrated
9
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