AD6315
1/4- to 1/12 Duty VFD Controller/Driver
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. A5 Dec 29, 2003
1/16
Features
- Multiple display modes
(16-segment & 12-digit to 24-segment & 4-digit)
- Key scanning (16 x 2 matrix)
- Dimming circuit (eight steps)
- High-voltage output ( V
EE (max)
= V
DD
35V )
- 4 channel LED ports
- No external resistors necessary for driver outputs
(P-ch open-drain + pull-down resistor output)
- Serial interface (CLK, STB, D
IN
, D
OUT
)
- Package: 44-pin plastic QFP and LQFP
General Description
The AD6315 is a VFD (Vacuum Fluorescent Display
or fluorescent Indicator Panel) driver that is driven
on a 1/4- to 1/12- duty factor. It consists of 16
segments and 4 grids output lines, 8 segments /
grid output driving lines, a display memory, a control
circuit, and a key scan circuit. Serial data is input to
the AD6315 through a 3-wire serial interface. This
VFD driver is ideal as a peripheral device for a
single-chip microcomputer.
Pin Assignments
Seg
19
/Grid
10
KEY
2
KEY
1
STB
CLK
D
IN
D
OUT
OSC
LED
4
LED
3
LED
1
34
35
36
37
38
39
40
41
42
43
44
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
23
24
25
26
27
28
29
30
31
32
33
LED
2
Seg
18
/Grid
11
Seg
17
/Grid
12
V
EE
Seg
16
/KS
16
Seg
15
/KS
15
Seg
14
/KS
14
Seg
13
/KS
13
Seg
12
/KS
12
Seg
11
/KS
11
Seg
10
/KS
10
Seg
1
/KS
1
V
DD
V
SS
Seg
2
/KS
2
Seg
3
/KS
3
Seg
4
/KS
4
Seg
5
/KS
5
Seg
6
/KS
6
Seg
7
/KS
7
Seg
8
/KS
8
Seg
9
/KS
9
V
SS
V
DD
Grid
1
Grid
2
Grid
3
Grid
4
Seg
23
/Grid
6
Seg
22
/Grid
7
Seg
21
/Grid
8
Seg
20
/Grid
9
Seg
24
/Grid
5
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
Anachip Corp.
www.anachip.com.tw
Rev. A5 Dec 29, 2003
2/16
Pin Descriptions
Symbol
Name
No.
Description
D
IN
Data
input
7
Input serial data at rising edge of shift clock,
starting from the low order bit.
D
OUT
Data
output
6
Output serial data at the falling edge of the
shift clock, starting from low order bit. This is
N-ch open-drain output pin.
STB Strobe
9
Initializes serial interface at the rising or
falling edge of the AD6315. It then waits for
reception of a command. Data input after
STB falling is processed as a command.
While command data is processed, current
processing is stopped, and the serial
interface is initialized. While STB is high, CLK
is ignored.
CLK Clock
input
8
Reads serial data at the rising edge, and
outputs data at the falling edge.
OSC Oscillator
pin
5
Connect resistor in between this pin and Vss to set
up the oscillation frequency.
Seg
1
/KS
1
to
Seg
16
/KS
16
High-voltage output (Segment) 14 to 29
Segment output pins (Dual function as key
source)
Grid
1
to Grid
4
High-voltage output (Grid)
39 to 42 Grid output pins
Seg
17
/Grid
12
to
Seg
24
/Grid
5
High-voltage output
(Segment/grid)
31 to 38
These pins are selectable for segment or grid
driving.
LED
1
to LED
4
LED output
1 to 4 CMOS output
KEY
1
, KEY
2
Key data input
10, 11
Data input to these pins is latched at the end
of the display cycle.
V
DD
Logic power
13, 43
Logic power supply
V
SS
Logic ground
12, 44 Connect this pin to system GND.
V
EE
Pull-down
level
30
Driver power supply
Ordering Information
AD6315X X X
Packing
Blank : Tray
Q: QFP-44L
L : LQFP-44L
Package
Lead
Blank: Normal
F: Lead Free
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
Anachip Corp.
www.anachip.com.tw
Rev. A5 Dec 29, 2003
3/16
Block Diagram
Serial
interface
OSC
Display memory
24 bits x 12 words
D
IN
D
OUT
CLK
STB
Command decoder
Dimming circuit
Timing generator
key scan
Key data memory
(2 x 16 bits)
24-
bi
t
ou
tpu
t
l
a
tc
h
12-
bi
t
s
h
i
f
t
r
egi
st
er
4-bit latch
Da
ta
se
le
ct
o
r
Gr
id
dr
i
v
er
M
u
l
t
ip
lex
ed dr
iv
er
Segm
e
n
t dr
i
v
er
LED
1
LED
4
V
DD
( + 5V )
V
SS
( 0V )
V
EE
( - 30V )
Grid
4
Grid
1
Seg
24
/Grid
5
Seg
17
/Grid
12
Seg
16
/KS
16
Seg
1
/KS
1
OSC
R
Key1,Key2
2
12
4
8
8
8
24
16
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
Anachip Corp.
www.anachip.com.tw
Rev. A5 Dec 29, 2003
4/16
Absolute Maximum Ratings
(T
A
= 25
C,V
SS
= 0V)
Parameter
Symbol
Rating
Unit
Logic supply voltage
V
DD
-0.5 to +6.0
V
Driver supply voltage
V
EE
V
DD
+ 0.5 to V
DD
40
V
Logic input voltage
V
I1
- 0.5 to V
DD
+ 0.5
V
VFD driver output voltage
V
O2
V
EE
- 0.5 to V
DD
+ 0.5
V
LED driver output current
I
O1
15 mA
VFD driver output current
I
O2
-40 (grid)
-15 (segment)
mA
Power dissipation
P
D
800
(Note) mW
Operating ambient temperature
T
A
-25 to +85
C
Storage temperature
T
stg
-50 to +150
C
Note : Derate at 6.4W/
C at T
A
= 25
C or higher.
Caution : If the absolute maximum rating of even one of the above parameters is exceeded even momentarily, the quality of the
product may be degraded. Absolute maximum ratings, therefore, specify the values exceeding which the product may
be physically damaged. Be sure to use the product within the range of the absolute maximum ratings.
Recommended Operating Range
(T
A
= -20 to 70
C, V
SS
= 0V)
Parameter
Symbol
Min.
Typ.
Max.
Unit
Logic supply voltage
V
DD
4.5 5 5.5 V
High-level input voltage
V
IH
0.7
V
DD
V
DD
V
Low-level input voltage
V
IL
0 0.3
V
DD
V
Driver supply voltage
V
EE
0 V
DD
-35 V
Remark :
Maximum power consumption
Pmax = VFD driver dissipation + R
L
dissipation + LED driver dissipation + dynamic power consumption
Where
segment current = 3mA, grid current = 15mA, and LED current = 20mA
VFD driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x 30(mW)
R
L
dissipation
(V
DD
- V
EE
)
2
/ 50 x (number of segments + 1 ) (mW)
LED driver dissipation = number of LEDs x 20 (mW)
Dynamic power consumption = V
DD
x 5 (mW)
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
Anachip Corp.
www.anachip.com.tw
Rev. A5 Dec 29, 2003
5/16
Electrical Characteristics
(T
A
= -20 to +70
C, V
DD
= 4.5 to 5.5V, V
SS
= 0V, V
EE
= V
DD
35V)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
High-level output voltage
V
OH1
LED
1
LED
4
, I
OH1
= -12 mA V
DD
-1
V
Low-level output voltage
V
OL1
LED
1
LED
4
, I
OL1
= +12mA
1
V
Low-level output voltage
V
OL2
D
OUT
, I
OL2
=2mA
0.4
V
High-level output current
I
OH21
V
O
= V
DD
2V,
Seg
1
/KS
1
to Seg
16
/KS
16
-0.3 mA
High-level output current
I
OH22
V
O
= V
DD
2V,Grid
1
to Grid
4
Seg
17
/Grid
12
to Seg
24
/Grid
5
-15 mA
Driver leakage current
I
OLEAK
V
O
= V
DD
35V, driver off
-10
A
Output pull-down resistor
R
L
Driver
output 35
45
120
k
Input current
I
I
V
I
=V
DD
or V
SS
1
1
A
High-level input voltage
V
IH
0.7V
DD
V
Low-level input voltage
V
IL
0.3
V
DD
V
Hysteresis voltage
V
H
CLK,
D
IN
,
STB
0.35 V
Dynamic current consumption
I
DDdyn
Under no load, display off
5
mA
Switching Characteristics
(T
A
= -20 to +70
C, V
DD
= 4.5 to 5.5V, V
EE
= 30V)
Parameter
Symbol
Conditions
Min.
Typ.
Max.
Unit
Oscillation frequency
f
OSC
R=82 k
350 500 650 kHz
t
PHZ
300
ns
Propagation delay time
t
PZL
CLKD
OUT
C
L
=15pF,R
L
=10 k
100
ns
t
TZH1
Seg
1
/KS
1
to Seg
16
/KS
16
2
S
Rise time
t
TZH2
C
L
=300pF
Grid
1
to Grid
4
,
Seg
17
/Grid
12
to Seg
24
/Grid
5
0.5
S
Fall time
t
THZ
C
L
=300pF, Seg
n
, Grid
n
160
S
Maximum clock frequency
F
MAX.
Duty=50%
1
MHz
Input capacitance
C
I
15
pF
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