Rainbow-electronics MAX6963 Manual do Utilizador descarregar pdf (Página 23)

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.

Digit Intensity Control

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

relative adjustments in digit intensity, while the display

panel is still controlled as a whole by the panel intensity.

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.

Panel Intensity Control

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

MAX6960–MAX6963

4-Wire Serially Interfaced

8 x 8 Matrix Graphic LED Drivers

______________________________________________________________________________________ 23

ADDRESS

CODE (HEX)

D7 D6 D5

D3 D2 D1

0/256 0x03 0 0 0 0000 0

1/256 0x03 0 0 0 0000 1

2/256 0x03 0 0 0 0001 0

3/256 0x03 0 0 0 0001 1

4/256 0x03 0 0 0 0010 0

— 0x03 ————————

251/256 0x03 1 1 1 1101 1

252/256 0x03 1 1 1 1110 0

253/256 0x03 1 1 1 1110 1

254/256 0x03 1 1 1 1111 0

255/256 (max on) 0x03 1 1 1 1111 1

Table 25. Digit 0 Intensity Register Format

ADDRESS CODE

(HEX)

D7 D6 D5 D4 D3 D2 D1 D0

0/256 0x04 0 0 000000

1/256 0x04 0 0 000001

2/256 0x04 0 0 000010

3/256 0x04 0 0 000011

4/256 0x04 0 0 000100

— 0x04 ————————

251/256 0x04 1 1 111011

252/256 0x04 1 1 111100

253/256 0x04 1 1 111101

254/256 0x04 1 1 111110

255/256 (max on) 0x04 1 1 111111

Table 26. Digit 1 Intensity Register Format

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 33 34

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