Holtek Semiconductor Inc HT16512 Datasheet
1/4 to 1/11 Duty VFD Controller
Features
Logic voltage: 5V
·
High-voltage output: VDD-30V max.
·
Multiple display (11-segment & 11-digit to
·
16-segment & 4-digit)
6´4 matrix key scanning
·
8 steps dimmer circuit
·
4 LED output ports
·
Applications
Consumer products panel function control
·
Industrial measuring instrument panel func
·
tion control
General Description
HT16512 is a VFD (Vacuum Fluorescent Dis
play) controller/driver that is driven on a 1/4 to
1/11 duty factor. It consists of 11 segment out
put lines, 6 grid output lines, 5 segment/grid
output drive lines, 4 LED output ports, a control circuit, a display memory, and a key scan
circuit.
HT16512
4-bit general purpose input port
·
No external resistors necessary for driver
·
output (provides PMOS open-drain and
pull-low resistor output)
Serial interface with MCU
·
(CLK, CS
Other similar application panel function
·
-
-
-
control
Serial data inputs to the HT16512 through a
three-line serial interface. This VFD control
ler/driver is ideal as a peripheral device for an
MCU.
, DI, DO)
-
1 December 24, 1999
Block Diagram
HT16512
DI
DO
CLK
CS
OSC
K0~K3
SW 0~SW 3
S e ria l I/F
OSC
4-B it
Latch
Pin Assignment
C om m and D ecoder
D isplay R A M
16-B it ´11 W ords
T im in g G e n e r a t o r
Key Scan
K e y D a ta R A M (4´6)
4 -B it L a tc h
LED0~LED 3
OSC
VSS
1
SW 0
2
SW 1
3
SW 2
4
SW 3
5
DO
6
DI
7
VSS
8
CLK
9
CS
10
K0
11
K1
12 13 14 15 16 17 18 19 20 21 22
K3
K2
LED 2
LED 1
LED 0
06$#
" " 3 . 2
VDD
S0/K0
S1/K1
16-B it
O utput Latch
11-B it
S h ift R e g is te r
VDD VSS VEE
LED 3
VDD
G1
G0
S2/K2
S3/K3
S4/K4
S5/K5
16 11
5
Selector
5
11 6
D im m ing C ircuit
G3
G2
3435363738394041424344
33
32
31
30
29
28
27
VEE
26
25
24
23
S6
S7
Data
G4
G5
S15/G 6
S14/G 7
S13/G 8
S12/G 9
S11/G 10
S10
S9
S8
5
Segm ent
Driver
M u lt ip le x e d
Driver
Grid
Driver
6
5
5
6
S0/K0~
S5/K5
S6~S10
S11/G 10~
S15/G 6
G0~G5
2 December 24, 1999
HT16512
Pin Description
Pin No. Pin Name I/O Description
1~4 SW0~SW3 I 4-bit general purpose input port
Output serial data at the falling edge of the shift clock,
5DO O
6DI I
7, 43 VSS
8 CLK I
9CS
10~13 K0~K3 I
14, 38 VDD
15~20 S0/K0~S5/K5 O
21~25 S6~S10 O
26, 28~31 S11/G10~S15/G6 O
27 VEE
37~32 G0~G5 O
42~39 LED0~LED3 O LED driver output ports. This is a CMOS output pin.
44 OSC I
starting from low order bit. This is an NMOS open-drain
output pin.
Input serial data at the rising edge of the shift clock, start
ing from the low order bit.
Power supply, ground
¾
Reads serial data at the rising edge, and outputs data at the
falling edge.
Initializes serial interface at the rising or falling edge of the
HT16512. Then it waits to receive a command. Data input
after CS
I
mand data is processed, current processing is stopped, and
the serial interface is initialized. While CS
ignored.
Keying data input to these pins is latched at the end of the
display cycle.
Posistive power supply
¾
Segment or key source output pins (dual function). This is
PMOS open-drain and pull-low resistor output.
Segment driver output pins (segment only). This is PMOS
open-drain and pull-low resistor output.
Segment or Grid driver output pins. These pins are
selectable for segment or grid driving. This is PMOS
open-drain and pull-low resistor output.
VFD power supply
¾
Grid driver output pins (Grid only). This is PMOS
open-drain and pull-low resistor output.
Connected to an external resistor or an RC oscillator cir
cuit.
has fallen is processed as a command. While com
is high, CLK is
-
-
-
3 December 24, 1999
Approximate internal connections
HT16512
NMOS OUT
PM O S OUT CMOS OUT
V
V
DD
V
EE
DD
Absolute Maximum Ratings
Supply Voltage..............................-0.3V to 5.5V
Input Voltage .................V
-0.3V to VDD+0.3V
SS
Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi
mum Ratings² 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 expo
sure to extreme conditions may affect device reliability.
D.C. Characteristics
Symbol Parameter
V
DD
V
EE
f
OSC
R
PL
I
DD
I
OL
I
OL1
I
OH1
I
OH21
Logic Supply Voltage
VFD Supply Voltage
Oscillation Frequency 5V
Output Pull-low Resistor 5V Driver output 50 100 150
Operating Current 5V
Driver Leakage Current 5V
LED Sink Current 5V
LED Source Current 5V
Segment/Key Source Current 5V
V
DD
¾¾
¾¾
Operating Temperature ..............-25°Cto75°C
Storage Temperature.................-50°Cto125°C
Test Conditions
Min. Typ. Max. Unit
Conditions
4.5 5 5.5 V
=51kW
R
OSC
No load,
VFD display off
O=VDD
-30V
V
VFD driver off
=1V
V
OL
LED0~LED3
=0.9V
V
OH
DD
LED0~LED3
V
OH=VDD
-2V
S0/K0~S5/K5,
0
350 500 650 kHz
¾¾
¾¾-10 mA
20
-1 ¾¾
-3 ¾¾
¾ V
¾¾
S6~S10
Ta=25°C
V
-30
DD
kW
5mA
mA
mA
mA
-
-
4 December 24, 1999
Loading...