Velleman 4-Digit Display Datasheet-2
LED Drive Control Special Circuit TM1637
8
©Titan Micro Electronics www.titanmec.com
V2.4
Hardware connection drawing
Nixie tube in circuit diagram is common anode one.
GND
SEG2/KS2
SEG3/KS3
SEG4/KS4
SEG6/KS6
SEG7/KS7
SEG8/KS8
GRID4
GRID3
GRID2
GRID1
VDD
DIO
CLK
K1
K2
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID3
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID2
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID1
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID6
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID5
a
bf
c
g
d
e
a
b
c
d
e
f
g
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
GRID4
SEG2
SEG3
SEG4
SEG6
SEG7
SEG8
VCC
100uF
104
GND
SEG8
SEG8SEG8
SEG8
dp
dp dp
dp
dp
dp
SEG8
dp
dpdp
dp
dp
dp
SEG8
SEG1/KS1
SEG5/KS5
GRID6
GRID6
SEG5
SEG1
GRID5
GRID5
GRID4
GRID3
GRID2
GRID1
SEG1
SEG2
SEG3
SEG4
SEG5
SEG6
SEG7
SEG8
100P
100P
1
2
MCU
Interface
DIO
CLK
R1
10K
R2
10K
VCC
VCC
GND
GND
TM1637
Note: 1. filtering capacitor between VDD and GND should be arranged on PCB plate as close to TM1637 chip as possible to
strengthen filtering effect.
2. 100pF capacitor connected to the DIO, CLK communication port pull-up and pull-down can reduce interference to
radio communications port.
3. Since blue-ray nixie tube break over step-down voltage is 3V, TM1637 power supply should be 5V.