AD6315 Datasheet PDF - Anachip

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AD6315
Anachip

Part Number AD6315
Description 1/4- to 1/12 Duty VFD Controller/Driver
Page 16 Pages


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1/4- to 1/12 Duty VFD Controller/Driver
AD6315
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 ( VEE (max) = VDD – 35V )
- 4 channel LED ports
- No external resistors necessary for driver outputs
(P-ch open-drain + pull-down resistor output)
- Serial interface (CLK, STB, DIN, DOUT)
- 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
Seg20/Grid9
Seg21/Grid8
Seg22/Grid7
Seg23/Grid6
Seg24/Grid5
Grid4
Grid3
Grid2
Grid1
VDD
VSS
Seg9/KS9
Seg8/KS8
Seg7/KS7
Seg6/KS6
Seg5/KS5
Seg4/KS4
Seg3/KS3
Seg2/KS2
Seg1/KS1
VDD
VSS
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



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1/4- to 1/12 Duty VFD Controller/Driver
AD6315
Pin Descriptions
Symbol
DIN
DOUT
STB
CLK
OSC
Seg1/KS1 to
Seg16/KS16
Grid1 to Grid4
Seg17/Grid12 to
Seg24/Grid5
LED1 to LED4
KEY1, KEY2
VDD
VSS
VEE
Name
Data input
Data output
Strobe
Clock input
Oscillator pin
High-voltage output (Segment)
High-voltage output (Grid)
High-voltage output
(Segment/grid)
LED output
Key data input
Logic power
Logic ground
Pull-down level
No. Description
7
Input serial data at rising edge of shift clock,
starting from the low order bit.
Output serial data at the falling edge of the
6 shift clock, starting from low order bit. This is
N-ch open-drain output pin.
Initializes serial interface at the rising or
falling edge of the AD6315. It then waits for
reception of a command. Data input after
9
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.
8
Reads serial data at the rising edge, and
outputs data at the falling edge.
5
Connect resistor in between this pin and Vss to set
up the oscillation frequency.
14 to 29
Segment output pins (Dual function as key
source)
39 to 42 Grid output pins
31 to 38
These pins are selectable for segment or grid
driving.
1 to 4 CMOS output
10, 11
Data input to these pins is latched at the end
of the display cycle.
13, 43 Logic power supply
12, 44 Connect this pin to system GND.
30 Driver power supply
Ordering Information
AD6315X X X
Package
Q: QFP-44L
L : LQFP-44L
Lead
Blank: Normal
F: Lead Free
Packing
Blank : Tray
Anachip Corp.
www.anachip.com.tw
2/16
Rev. A5 Dec 29, 2003



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1/4- to 1/12 Duty VFD Controller/Driver
Block Diagram
AD6315
DIN
DOUT
CLK
STB
Serial
interface
R OSC
OSC
Key1,Key2
2
Command decoder
Display memory
24 bits x 12 words
Timing generator
key scan
Key data memory
(2 x 16 bits)
4-bit latch
LED1
LED4
Dimming circuit
24 16
8
8
8
12 4
VDD
( + 5V )
VSS
( 0V )
VEE
( - 30V )
Seg1/KS1
Seg16/KS16
Seg17/Grid12
Seg24/Grid5
Grid1
Grid4
Anachip Corp.
www.anachip.com.tw
3/16
Rev. A5 Dec 29, 2003



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1/4- to 1/12 Duty VFD Controller/Driver
AD6315
Absolute Maximum Ratings (TA = 25°C,VSS = 0V)
Parameter
Logic supply voltage
Driver supply voltage
Logic input voltage
VFD driver output voltage
LED driver output current
VFD driver output current
Power dissipation
Operating ambient temperature
Storage temperature
Symbol
VDD
VEE
VI1
VO2
IO1
IO2
PD
TA
Tstg
Rating
-0.5 to +6.0
VDD + 0.5 to VDD – 40
- 0.5 to VDD + 0.5
VEE - 0.5 to VDD + 0.5
15
-40 (grid)
-15 (segment)
800 (Note)
-25 to +85
-50 to +150
Unit
V
V
V
V
mA
mA
mW
°C
°C
Note : Derate at –6.4W/°C at TA = 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 (TA = -20 to 70°C, VSS = 0V)
Parameter
Logic supply voltage
High-level input voltage
Low-level input voltage
Driver supply voltage
Symbol
VDD
VIH
VIL
VEE
Min.
4.5
0.7 VDD
0
0
Typ.
5
Max.
5.5
VDD
0.3 VDD
VDD-35
Remark :
Maximum power consumption
Pmax = VFD driver dissipation + RL 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)
RL dissipation (VDD - VEE)2 / 50 x (number of segments + 1 ) (mW)
LED driver dissipation = number of LEDs x 20 (mW)
Dynamic power consumption = VDD x 5 (mW)
Unit
V
V
V
V
Anachip Corp.
www.anachip.com.tw
4/16
Rev. A5 Dec 29, 2003



AD6315 datasheet pdf
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AD6315 pdf
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