Datasheet

10
Figure 6. Block diagram for HCMS-39xx
40 BIT
S.R.
DO
DI
DATA IN
OSCILLATOR
÷8
CLK
CHIP
ENABLE
REGISTER
SELECT
RESET
OSC
OSC
SELECT
BLANK
DATA IN
CLR
DATA
OUT
CONTROL
REGISTER
REFRESH
CONTROL
RST
PRESCALE
VALUE
H
L
H
L
L
H
D Q
RS
(LATCHED)
L
H
CURRENT
REFERENCE
PWM BRIGHTNESS
CONTROL
LH
LH
RS (LATCHED)
SER/PAR
MODE
3:8 DECODER
40 BIT
S.R.
DO
DI
40 BIT
S.R.
DO
DI
40 BIT
S.R.
DO
DI
ANODE
CURRENT SOURCES
V LED +
GND (LED)
0
CHAR 0
COLUMN 0 COLUMN 19
CHAR 1 CHAR 2 CHAR 3
ROW 7
DOT
REGISTER
BIT # 159
ROW 1
ROW 0 (NO LEDS)
DOT
REGISTERS
AND
LATCHES
DATA OUT
CATHODE
FIELD DRIVERS
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