Rainbow Electronics MAX6973 - Manual (Page 6)

MAX6972/MAX6973
16-Output PWM LED Drivers
for Message Boards
6 _______________________________________________________________________________________
MAX6972 Block Diagram
MUX1
OUTPUT
MUX0
OUTPUT
Y LED DRIVERS
Y7–Y0
I SET
EXT. PNP
8-BIT
Y CALDAC
Z LED DRIVERS
Z0–Z7
CALIBRATION
DATA LATCH
GLOBAL-
INTENSITY
DATA LATCH
PWM
COUNTERS
SYNC
CONTROL
SYNC DETECT 24-BIT NEW HEADER
SHIFT REGISTER
7-BIT GLOBAL-INTENSITY FRAME MODULATOR
12-BIT INDIVIDUAL INPUT MODULATOR
8
I SET
8-BIT
Z CALDAC
Y LED OUTPUT
Y7 Y6 Y5 Y4 Y3 Y2 Y1 Y0
Z LED OUTPUT
Z7 Z6 Z5 Z4 Z3 Z2 Z1 Z0
8
8
0/1
8
7
7
192
192 192
192 192
192
192
192
16
7
MUX0 PIXEL PWM OLD DATA LATCH MUX1 PIXEL PWM OLD DATA LATCH
LOAD
OE
LOAD
OE
MUX0 PIXEL PWM NEW DATA LATCH MUX1 PIXEL PWM NEW DATA LATCH
192-BIT DATA SHIFT REGISTER
EN
CLKI
DIN
EN
DOUT
CLKO
LOADO
D Q1
LOADI
EXT. PNP
MAX6972