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MAX7219CWG Datasheet(PDF) 8 Page - Maxim Integrated Products

Part # MAX7219CWG
Description  Serially Interfaced, 8-Digit LED Display Drivers
Download  16 Pages
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Manufacturer  MAXIM [Maxim Integrated Products]
Direct Link  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX7219CWG Datasheet(HTML) 8 Page - Maxim Integrated Products

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Intensity Control
and Interdigit Blanking
The MAX7219/MAX7221 allow display brightness to be
controlled with an external resistor (RSET) connected
between V+ and ISET. The peak current sourced from
the segment drivers is nominally 100 times the current
entering ISET. This resistor can either be fixed or vari-
able to allow brightness adjustment from the front
panel. Its minimum value should be 9.53k
Ω, which typi-
cally sets the segment current at 40mA. Display bright-
ness can also be controlled digitally by using the
intensity register.
Digital control of display brightness is provided by an
internal pulse-width modulator, which is controlled by
the lower nibble of the intensity register. The modulator
scales the average segment current in 16 steps from a
maximum of 31/32 down to 1/32 of the peak current set
by RSET (15/16 to 1/16 on MAX7221). Table 7 lists the
intensity register format. The minimum interdigit blank-
ing time is set to 1/32 of a cycle.
Serially Interfaced, 8-Digit LED Display Drivers
8
_______________________________________________________________________________________
Table 5. Code B Font
Table 6. No-Decode Mode Data Bits and
Corresponding Segment Lines
0
0
X
0
0
0
1
1
1
1
1
1
D7*
REGISTER DATA
0
7-SEGMENT
CHARACTER
D3
D6–D4
D1
D2
DP*
D0
B
A
D
C
F
E
G
1
0
X
0
0
1
1
0
ON SEGMENTS = 1
0
1
0
0
0
2
0
X
1
0
0
1
1
1
0
0
1
1
3
0
X
1
0
1
1
1
1
1
0
0
1
4
0
X
0
1
0
1
0
0
1
1
0
1
5
0
X
0
1
1
0
1
1
1
1
0
1
6
0
X
1
1
0
0
1
1
1
1
1
1
7
0
X
1
1
1
1
1
0
1
0
0
0
8
1
X
0
0
0
1
1
1
1
1
1
1
9
1
X
0
0
1
1
1
1
1
1
0
1
1
X
1
0
0
0
0
0
0
0
0
1
E
1
X
1
0
1
0
1
1
0
1
1
1
H
1
X
0
1
0
1
0
0
1
1
1
1
L
1
X
0
1
1
0
0
1
0
1
1
0
P
1
X
1
1
0
1
1
0
0
1
1
1
blank
1
X
1
1
1
0
0
0
0
0
0
0
*The decimal point is set by bit D7 = 1
F
E
A
G
D
C
B
STANDARD 7-SEGMENT LED
DP
A
Corresponding
Segment Line
D6
DP
C
D4
B
D5
E
D2
D
G
REGISTER DATA
D0
F
D1
D3
D7


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