Max6975 block diagram – Rainbow Electronics MAX6975 User Manual
Page 7
MAX6974/MAX6975
24-Output PWM LED Drivers
for Message Boards
_______________________________________________________________________________________
7
MAX6975 Block Diagram
R LED DRIVERS
R7–R0
I
SET
R7
I
SET
8-BIT
G CALDAC
MUX1
OUTPUTS
5-BIT GLOBAL-INTENSITY PDM MODULATOR
14-BIT INDIVIDUAL PWM MODULATOR
8
8
336
CALIBRATION
DATA LATCH
GLOBAL-
INTENSITY
DATA LATCH
8
8
MUX0 PIXEL PWM NEW DATA LATCH
MUX1 PIXEL PWM NEW DATA LATCH
336
336
EXT. PNP
EXT. PNP
5
5
EN
EN
PWM
COUNTERS
SYNC
336-BIT DATA SHIFT REGISTER
CLKI
LOADI
D
CLKO
DOUT
DIN
336
336
336
CONTROL
MUX0 PIXEL PWM OLD DATA LATCH
LOAD
336
336
MUX1 PIXEL PWM OLD DATA LATCH
OE
LOAD
Q1
24
5
MUX0
OUTPUT
24-BIT NEW HEADER
SHIFT REGISTER
SYNC DETECT
R6 R5 R4 R3 R2 R1 R0
8-BIT
R CALDAC
R LED OUTPUTS
G LED DRIVERS
G7–G0
G7 G6 G5 G4 G3 G2 G1 G0
G LED OUTPUTS
LOADO
I
SET
8-BIT
B CALDAC
8
B LED DRIVERS
B7–B0
B7 B6 B5 B4 B3 B2 B1 B0
B LED OUTPUTS
8
0/1
OE
MAX6975