MAX6960 MAXIM [Maxim Integrated Products], MAX6960 Datasheet - Page 23

• Manufacturer Part Number: MAX6960
• Description: 4-Wire Serially Interfaced 8 x 8 Matrix Graphic LED Drivers
• Manufacturer: MAXIM [Maxim Integrated Products]

Table 25. Digit 0 Intensity Register Format
Table 26. Digit 1 Intensity Register Format
arithmetic (off, 1/3, 2/3, full) or geometric (off, 1/4, 1/2,
full). The setting is made on a digit-by-digit basis, so
each color on an RGY or RGB panel can use the most
appropriate graduation type.
The digit intensity registers (Tables 25 and 26) set the
fractions of the panel intensity PWM value that are
applied to the two display digits. The PWM for each
digit is calculated as n/256th of the panel intensity
value, where n is the value in the digit’s digit intensity
register. The digit intensity registers enable configuring
relative adjustments in digit intensity, while the display
panel is still controlled as a whole by the panel intensity.
255/256 (max on)
255/256 (max on)
REGISTER
REGISTER
251/256
252/256
253/256
254/256
251/256
252/256
253/256
254/256
0/256
1/256
2/256
3/256
4/256
0/256
1/256
2/256
3/256
4/256
—
—
______________________________________________________________________________________
Digit Intensity Control
8 x 8 Matrix Graphic LED Drivers
ADDRESS CODE
CODE (HEX)
ADDRESS
(HEX)
0x03
0x03
0x03
0x03
0x03
0x03
0x03
0x03
0x03
0x03
0x03
0x04
0x04
0x04
0x04
0x04
0x04
0x04
0x04
0x04
0x04
0x04
4-Wire Serially Interfaced
D7
D7
—
—
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
These adjustments are typically used to calibrate out
luminosity differences between LEDs from different
batches. They can also be used to color balance RGY
displays so that, for example, full panel intensity of a
red-green panel is a consistent orange hue.
Digital control of panel display brightness is provided
by an internal pulse-width modulator, which is con-
trolled by the panel intensity register (Table 27). The
modulator scales the average segment current in 253
steps from a maximum of 255/256 down to 2/256 of the
peak current. The maximum effective PWM duty cycle
for a digit is therefore 254/256, given by the maximum
D6
D6
—
—
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
D5
D5
—
—
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
REGISTER DATA
REGISTER DATA
D4
—
D4
—
0
0
0
0
0
1
1
1
1
1
0
0
0
0
0
1
1
1
1
1
Panel Intensity Control
D3
—
D3
0
0
0
0
0
1
1
1
1
1
—
0
0
0
0
0
1
1
1
1
1
D2
—
D2
0
0
0
0
1
0
1
1
1
1
—
0
0
0
0
1
0
1
1
1
1
D1
—
D1
0
0
1
1
0
1
0
0
1
1
—
0
0
1
1
0
1
0
0
1
1
D0
—
D0
0
1
0
1
0
1
0
1
0
1
—
0
1
0
1
0
1
0
1
0
1
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