HT16515 (Holtek), display drivers
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HT16515
1/4 to 1/12 Duty VFD Controller
Features
4 LED output ports
High-voltage output: V
DD
-35V max.
No external resistors necessary for driver output
(provides PMOS open-drain and pull-low resistor
output)
M
display
(1
igit to 24-segment & 4-digit)
16
2 matrix key scanning
Serial interface with MCU (CLK, CS, DI, DO)
44-pin QFP package
8 steps dimmer circuit
Applications
Other similar applications for panel function control
Industrial measuring instrument panel function control
General Description
HT16515 is a VFD (Vacuum Fluorescent Display) con-
troller/driver that is driven on a 1/4 to 1/12 duty factor. It
consists of 16 segment output lines, 4 grid output lines,
8 segment/grid output drive lines, 4 LED output ports, a
control circuit, a display memory, and a key scan circuit.
Serial data inputs to the HT16515 through a three-line
serial interface. This VFD controller/driver is an ideal
MCU peripheral device.
Block Diagram
Rev. 1.40
1
November 1, 2007
Logic voltage: 3.0V~5.5V
Consumer products panel function control
HT16515
Pin Assignment
Pad Assignment
Chip Size:
* The IC substrate should be connected to VSS in the PCB layout artwork.
Rev. 1.40
2
November 1, 2007
HT16515
Pad Coordinates
Unit:
m
Pad No.
X
Y
Pad No.
X
Y
1
962.50
600.00
23
834.10
754.00
2
962.50
495.00
24
834.10
652.60
3
962.50
380.20
25
834.10
551.20
4
962.50
275.20
26
834.10
449.80
5
962.50
107.20
27
834.10
348.40
6
962.50
235.60
28
834.10
247.00
7
962.50
366.00
29
834.10
145.60
8
962.50
471.00
30
987.30
0.50
9
962.50
576.00
31
987.30
130.50
10
962.50
681.00
32
987.30
382.05
11
962.50
786.00
33
987.30
734.05
12
689.60
772.45
34
610.30
594.40
13
460.45
595.30
35
508.90
594.40
14
344.25
595.30
36
407.50
594.40
15
242.85
595.30
37
306.10
594.40
16
141.45
595.30
38
204.70
594.40
17
40.05
595.30
39
103.30
594.40
18
61.35
595.30
40
1.90
594.40
19
162.75
595.30
41
99.50
594.40
20
264.15
595.30
42
200.90
594.40
21
365.55
595.30
43
317.10
594.40
22
466.95
595.30
44
624.50
756.80
Pin Description
Pin No.
Pin Name
I/O
Description
1~4
LED3~LED0
O
LED driver output ports. This is a CMOS output pin and maximum driving
current up to +20mA.
5
OSC
I Connected to an external resistor or an RC oscillator circuit.
6
DO
O
Data output pin, output serial data at falling edge of shift clock, starting from
the lower bit. This is N-ch open-drain output pin.
7
DI
I
Data input pin, input serial data at rising edge of shift clock, starting from the
lower bit.
8
CLK
I
Clock input pin. Reads serial data at the rising edge, and outputs data at the
falling edge.
9
CS
I
Initializes serial interface at the rising or falling
edg
e of the HT16515. Then
it waits to receive a command. Data input after CS has fallen is processed,
cur
rent processing is stopped, and the serial interface is initialized. While
CS is high, CLK is ignored.
10, 11 Key0, Key1
I Key-in data input to these pins are latched at the end of the display cycle.
12, 44 VSS
Negative power supply, ground
13, 43 VDD
Positive power supply
14~29 Seg1/KS1~Seg16/KS16 O
High voltage output, segment output pins, dual function as key source. This
is PMOS open-drain and pull-low resistor output.
30
VEE
VFD power supply
31~38
Seg17/Grid12~
Seg24/Grid5
O
High voltage output, these pins are selectable for segment or grid output.
This is PMOS open-drain and pull-low resistor output.
39~42 Grid4~Grid1
O
High voltage output, grids output pin. This is PMOS open-drain and pull-low
resistor output.
Rev. 1.40
3
November 1, 2007
HT16515
Approximate Internal Connections
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
0.3V to V
SS
+6.0V
Operating Temperature...........................
25
Cto75
C
Input Voltage..............................V
SS
0.3V to V
DD
+0.3V
Storage Temperature ............................
50
Cto125
C
Note: These are stress ratings only. Stresses exceeding the range specified under
may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Absolute Maximum Ratings
D.C. Characteristics
Ta=25
C, V
EE
=V
DD
35V
Symbol
Parameter
Test Conditions
Min.
Typ. Max. Unit
V
DD
Conditions
V
DD
3.3V
3
3.3
3.6
V
Logic Supply Voltage
5V
4.5
5
5.5
V
V
EE
VFD Supply Voltage
0
V
DD
35
V
f
OSC
3.3V
Oscillation Frequency
R
OSC
=82k
350
500
650
kHz
5V
3.3V
R
PL
Output Pull-low Resistor
Driver output
40
65
120
k
5V
3.3V
No load, VFD display off,
data output =00H
3
I
DD
Operating Current
mA
5V
5
I
OL
3.3V
5
5
Driver Leakage Current
V
O
=V
DD
35V, VFD driver off
A
5V
10
10
3.3V
10
mA
I
OL1
LED Sink Current
V
OL
=1V, LED0~LED3
5V
20
I
OH1
3.3V
V
OH
=0.9V
DD
, LED0~LED3
1.5
LED Source Current
mA
5V
3
I
OH21
3.3V
V
OH
=V
DD
2V
1.5
Segment 1~16 Source Current
mA
5V
3
I
OH22
Segment 17~24, Grid 1~4
Source Current
3.3V
V
OH
=V
DD
2V
7.5
mA
5V
15
3.3V
2
mA
I
OL3
DO Sink Current
V
OL
=0.4V
5V
4
V
IH
H
Input Voltage
0.7V
DD
V
DD
V
Rev. 1.40
4
November 1, 2007
HT16515
Test Conditions
Symbol
Parameter
Min.
Typ. Max. Unit
V
DD
Conditions
V
IL
L
Input Voltage
0
0.3V
DD
V
3.3V
0.17
V
V
H
Hysteresis Voltage
CLK, D
IN
,CS
5V
0.35
V
OH1
High-level Output Voltage
3.3V LED0~LED3, I
OH1
=
1.5mA
0.9V
DD
V
DD
V
5V
LED0~LED3, I
OH1
=
3mA
V
OL1
Low-level Output Voltage
3.3V LED0~LED3, I
OL1
=10mA
0
1
V
5V LED0~LED3, I
OL1
=20mA
V
OL2
Low-level Output Voltage
3.3V DO, I
OL2
=2mA
0
0.4
V
5V DO, I
OL2
=4mA
A.C. Characteristics
Ta=25
C
Symbol
Parameter
Test Conditions
Min.
Typ. Max. Unit
V
DD
Conditions
3.3V
600
t
PHL
5V
CLK
DO
C
L
=15pF, R
L
=10k
300
Logic Supply Voltage
ns
3.3V
600
t
PLH
5V
300
3.3V
C
L
=300pF, S1~S16
4
t
r1
5V
2
Rise Time
s
3.3V
1
C
L
=300pF, G1~G4
S17/G12~S24/G5
t
r2
5V
0.5
t
f
3.3V
C
L
=300pF, Sn, Gn
240
Fall Time
s
5V
120
t
max
3.3V
0.5
MHz
Maximum Clock Frequency
Duty=50%
5V
1
3.3V
C
i
Input Capacitance
15
pF
5V
3.3V
800
ns
t
CW
Clock Pulse Width
5V
400
3.3V
2
us
t
SW
Strobe Pulse Width
5V
1
3.3V
200
ns
t
SU
Data Setup Time
5V
100
3.3V
200
ns
t
h
Data Hold Time
5V
100
3.3V
CLK rising edge to CS rising
edge
2
t
CS
Clock-Strobe Time
s
5V
1
3.3V
CLK rising edge to CLK falling
edge
2
t
W
Wait Time
s
5V
1
Rev. 1.40
5
November 1, 2007
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HT16515
1/4 to 1/12 Duty VFD Controller
Features
4 LED output ports
High-voltage output: V
DD
-35V max.
No external resistors necessary for driver output
(provides PMOS open-drain and pull-low resistor
output)
M
display
(1
igit to 24-segment & 4-digit)
16
2 matrix key scanning
Serial interface with MCU (CLK, CS, DI, DO)
44-pin QFP package
8 steps dimmer circuit
Applications
Other similar applications for panel function control
Industrial measuring instrument panel function control
General Description
HT16515 is a VFD (Vacuum Fluorescent Display) con-
troller/driver that is driven on a 1/4 to 1/12 duty factor. It
consists of 16 segment output lines, 4 grid output lines,
8 segment/grid output drive lines, 4 LED output ports, a
control circuit, a display memory, and a key scan circuit.
Serial data inputs to the HT16515 through a three-line
serial interface. This VFD controller/driver is an ideal
MCU peripheral device.
Block Diagram
Rev. 1.40
1
November 1, 2007
Logic voltage: 3.0V~5.5V
Consumer products panel function control
HT16515
Pin Assignment
Pad Assignment
Chip Size:
* The IC substrate should be connected to VSS in the PCB layout artwork.
Rev. 1.40
2
November 1, 2007
HT16515
Pad Coordinates
Unit:
m
Pad No.
X
Y
Pad No.
X
Y
1
962.50
600.00
23
834.10
754.00
2
962.50
495.00
24
834.10
652.60
3
962.50
380.20
25
834.10
551.20
4
962.50
275.20
26
834.10
449.80
5
962.50
107.20
27
834.10
348.40
6
962.50
235.60
28
834.10
247.00
7
962.50
366.00
29
834.10
145.60
8
962.50
471.00
30
987.30
0.50
9
962.50
576.00
31
987.30
130.50
10
962.50
681.00
32
987.30
382.05
11
962.50
786.00
33
987.30
734.05
12
689.60
772.45
34
610.30
594.40
13
460.45
595.30
35
508.90
594.40
14
344.25
595.30
36
407.50
594.40
15
242.85
595.30
37
306.10
594.40
16
141.45
595.30
38
204.70
594.40
17
40.05
595.30
39
103.30
594.40
18
61.35
595.30
40
1.90
594.40
19
162.75
595.30
41
99.50
594.40
20
264.15
595.30
42
200.90
594.40
21
365.55
595.30
43
317.10
594.40
22
466.95
595.30
44
624.50
756.80
Pin Description
Pin No.
Pin Name
I/O
Description
1~4
LED3~LED0
O
LED driver output ports. This is a CMOS output pin and maximum driving
current up to +20mA.
5
OSC
I Connected to an external resistor or an RC oscillator circuit.
6
DO
O
Data output pin, output serial data at falling edge of shift clock, starting from
the lower bit. This is N-ch open-drain output pin.
7
DI
I
Data input pin, input serial data at rising edge of shift clock, starting from the
lower bit.
8
CLK
I
Clock input pin. Reads serial data at the rising edge, and outputs data at the
falling edge.
9
CS
I
Initializes serial interface at the rising or falling
edg
e of the HT16515. Then
it waits to receive a command. Data input after CS has fallen is processed,
cur
rent processing is stopped, and the serial interface is initialized. While
CS is high, CLK is ignored.
10, 11 Key0, Key1
I Key-in data input to these pins are latched at the end of the display cycle.
12, 44 VSS
Negative power supply, ground
13, 43 VDD
Positive power supply
14~29 Seg1/KS1~Seg16/KS16 O
High voltage output, segment output pins, dual function as key source. This
is PMOS open-drain and pull-low resistor output.
30
VEE
VFD power supply
31~38
Seg17/Grid12~
Seg24/Grid5
O
High voltage output, these pins are selectable for segment or grid output.
This is PMOS open-drain and pull-low resistor output.
39~42 Grid4~Grid1
O
High voltage output, grids output pin. This is PMOS open-drain and pull-low
resistor output.
Rev. 1.40
3
November 1, 2007
HT16515
Approximate Internal Connections
Absolute Maximum Ratings
Supply Voltage ...........................V
SS
0.3V to V
SS
+6.0V
Operating Temperature...........................
25
Cto75
C
Input Voltage..............................V
SS
0.3V to V
DD
+0.3V
Storage Temperature ............................
50
Cto125
C
Note: These are stress ratings only. Stresses exceeding the range specified under
may
cause substantial damage to the device. Functional operation of this device at other conditions beyond those
listed in the specification is not implied and prolonged exposure to extreme conditions may affect device reliabil-
ity.
Absolute Maximum Ratings
D.C. Characteristics
Ta=25
C, V
EE
=V
DD
35V
Symbol
Parameter
Test Conditions
Min.
Typ. Max. Unit
V
DD
Conditions
V
DD
3.3V
3
3.3
3.6
V
Logic Supply Voltage
5V
4.5
5
5.5
V
V
EE
VFD Supply Voltage
0
V
DD
35
V
f
OSC
3.3V
Oscillation Frequency
R
OSC
=82k
350
500
650
kHz
5V
3.3V
R
PL
Output Pull-low Resistor
Driver output
40
65
120
k
5V
3.3V
No load, VFD display off,
data output =00H
3
I
DD
Operating Current
mA
5V
5
I
OL
3.3V
5
5
Driver Leakage Current
V
O
=V
DD
35V, VFD driver off
A
5V
10
10
3.3V
10
mA
I
OL1
LED Sink Current
V
OL
=1V, LED0~LED3
5V
20
I
OH1
3.3V
V
OH
=0.9V
DD
, LED0~LED3
1.5
LED Source Current
mA
5V
3
I
OH21
3.3V
V
OH
=V
DD
2V
1.5
Segment 1~16 Source Current
mA
5V
3
I
OH22
Segment 17~24, Grid 1~4
Source Current
3.3V
V
OH
=V
DD
2V
7.5
mA
5V
15
3.3V
2
mA
I
OL3
DO Sink Current
V
OL
=0.4V
5V
4
V
IH
H
Input Voltage
0.7V
DD
V
DD
V
Rev. 1.40
4
November 1, 2007
HT16515
Test Conditions
Symbol
Parameter
Min.
Typ. Max. Unit
V
DD
Conditions
V
IL
L
Input Voltage
0
0.3V
DD
V
3.3V
0.17
V
V
H
Hysteresis Voltage
CLK, D
IN
,CS
5V
0.35
V
OH1
High-level Output Voltage
3.3V LED0~LED3, I
OH1
=
1.5mA
0.9V
DD
V
DD
V
5V
LED0~LED3, I
OH1
=
3mA
V
OL1
Low-level Output Voltage
3.3V LED0~LED3, I
OL1
=10mA
0
1
V
5V LED0~LED3, I
OL1
=20mA
V
OL2
Low-level Output Voltage
3.3V DO, I
OL2
=2mA
0
0.4
V
5V DO, I
OL2
=4mA
A.C. Characteristics
Ta=25
C
Symbol
Parameter
Test Conditions
Min.
Typ. Max. Unit
V
DD
Conditions
3.3V
600
t
PHL
5V
CLK
DO
C
L
=15pF, R
L
=10k
300
Logic Supply Voltage
ns
3.3V
600
t
PLH
5V
300
3.3V
C
L
=300pF, S1~S16
4
t
r1
5V
2
Rise Time
s
3.3V
1
C
L
=300pF, G1~G4
S17/G12~S24/G5
t
r2
5V
0.5
t
f
3.3V
C
L
=300pF, Sn, Gn
240
Fall Time
s
5V
120
t
max
3.3V
0.5
MHz
Maximum Clock Frequency
Duty=50%
5V
1
3.3V
C
i
Input Capacitance
15
pF
5V
3.3V
800
ns
t
CW
Clock Pulse Width
5V
400
3.3V
2
us
t
SW
Strobe Pulse Width
5V
1
3.3V
200
ns
t
SU
Data Setup Time
5V
100
3.3V
200
ns
t
h
Data Hold Time
5V
100
3.3V
CLK rising edge to CS rising
edge
2
t
CS
Clock-Strobe Time
s
5V
1
3.3V
CLK rising edge to CLK falling
edge
2
t
W
Wait Time
s
5V
1
Rev. 1.40
5
November 1, 2007
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