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AD6315
1/4- to 1/12 Duty VFD Controller/Driver 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
Seg19/Grid10 Seg18/Grid11 Seg17/Grid12 Seg16/KS16 Seg15/KS15 Seg14/KS14 Seg13/KS13 Seg12/KS12 Seg11/KS11 24 Seg10/KS10 23 22
33
32
31
30
VEE
29
28
27
26
34
Seg20/Grid9 Seg21/Grid8 Seg22/Grid7 Seg23/Grid6 Seg24/Grid5 Grid4 Grid3 Grid2 Grid1 VDD VSS
25
Seg9/KS9 Seg8/KS8 Seg7/KS7 Seg6/KS6 Seg5/KS5 Seg4/KS4 Seg3/KS3 Seg2/KS2 Seg1/KS1 VDD VSS
35
36
37
38
39
40
41
42
43
44
10
1
2
3
4
5
6
7
8
DOUT
OSC
CLK
LED2
LED3
LED4
STB
9
KEY1
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.
KEY2
LED1
DIN
11
12
13
14
15
16
17
18
19
20
21
Rev. A5 Dec 29, 2003 1/16
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Pin Descriptions
Symbol DIN DOUT Name Data input Data output No. 7 6 Description Input serial data at rising edge of shift clock, starting from the low order bit. Output serial data at the falling edge of the 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 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. Reads serial data at the rising edge, and outputs data at the falling edge.
Connect resistor in between this pin and Vss to set up the oscillation frequency.
STB
Strobe
9
CLK OSC Seg1/KS1 to Seg16/KS16 Grid1 to Grid4 Seg17/Grid12 to Seg24/Grid5 LED1 to LED4 KEY1, KEY2 VDD VSS VEE
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
8 5 14 to 29
Segment output pins (Dual function as key source) 39 to 42 Grid output pins These pins are selectable for segment or grid 31 to 38 driving. 1 to 4 10, 11 13, 43 12, 44 30 CMOS output Data input to these pins is latched at the end of the display cycle.
Logic power supply
Connect this pin to system GND.
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
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Block Diagram
Command decoder
Dimming circuit
DOUT CLK STB
Serial interface
Display memory 24 bits x 12 words
24-bit output latch
Segment driver
DIN
24
16
Seg1/KS1
8
Seg16/KS16
R
OSC
OSC
Data selector
Timing generator key scan 12-bit shift register
8
Multiplexed driver
Seg17/Grid12
Key data memory (2 x 16 bits) Key1,Key2 2
Seg24/Grid5 Grid1 Grid4
12 4-bit latch
4
VDD LED1 LED4
( + 5V )
VSS
( 0V )
VEE
( - 30V )
Anachip Corp. www.anachip.com.tw 3/16
Grid driver
8
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Absolute Maximum Ratings (TA = 25C,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
Note : Derate at -6.4W/C at TA = 25C 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.
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
Recommended Operating Range (TA = -20 to 70C, 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 Unit V V V V
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)
Anachip Corp. www.anachip.com.tw 4/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Electrical Characteristics (TA= -20 to +70C, VDD = 4.5 to 5.5V, VSS = 0V, VEE = VDD -35V)
Parameter High-level output voltage Low-level output voltage Low-level output voltage High-level output current High-level output current Driver leakage current Output pull-down resistor Input current High-level input voltage Low-level input voltage Hysteresis voltage Dynamic current consumption Symbol VOH1 VOL1 VOL2 IOH21 IOH22 IOLEAK RL II VIH VIL VH IDDdyn CLK, DIN, STB Under no load, display off 0.35 5 Conditions Min. Typ. Max. Unit V 1 0.4 -0.3 -15 -10 35 1 0.7VDD 0.3 VDD 45 120 1 V V mA mA A k A V V V mA
LED1 - LED4, IOH1 = -12 mA VDD -1 LED1 - LED4, IOL1 = +12mA DOUT, IOL2 =2mA VO= VDD -2V, Seg1/KS1 to Seg16/KS16 VO= VDD -2V,Grid1 to Grid4 Seg17/Grid12 to Seg24/Grid5 VO= VDD -35V, driver off Driver output VI=VDD or VSS
Switching Characteristics (TA= -20 to +70C, VDD = 4.5 to 5.5V, VEE = -30V)
Parameter Oscillation frequency Propagation delay time Rise time Fall time Maximum clock frequency Input capacitance Symbol fOSC tPHZ tPZL tTZH1 tTZH2 tTHZ FMAX. CI Conditions R=82 k CLKDOUT CL=15pF,RL=10 k CL=300pF
Seg1/KS1 to Seg16/KS16 Grid1 to Grid4, Seg17/Grid12 to Seg24/Grid5
Min. 350
Typ. 500
Max. 650 300 100 2 0.5 160 1 15
Unit kHz ns ns S S S MHz pF
CL=300pF, Segn, Gridn Duty=50%
Anachip Corp. www.anachip.com.tw 5/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Timing Characteristics (TA= -20 to +70C, VDD = 4.5 to 5.5V)
Parameter Clock pulse width Strobe pulse width Data setup time Data hold time Clock-strobe time Wait time Symbol PWCLK PWSTB Tsetup tHOLD tCLK-STB tWAIT Conditions Min. 400 1 100 100 1 1 Typ. Max. Unit ns S ns ns s s
CLK STB CLK STB (Note)
Note : Refer to the Serial communication format.
Function Descriptions
(1) Display RAM Address and Display Mode The display RAM stores the data transmitted to the AD6315 through the serial communication. The addresses are allocated in 8-bit units. Seg1 00HL 03HU 06HL 09HL 0CHL 0FHL 12HL 15HL 18HL 1BHL 1EHL 21HL Seg4 Seg8 00HU 03HU 06HU 09HU 0CHU 0FHU 12HU 15HU 18HU 1BHU 1EHU 21HU Seg12 01HL 04HL 07HL 0AHL 0DHL 10HL 13HL 16HL 19HL 1CHL 1FHL 22HL Seg16 01HU 04HU 07HU 0AHU 0DHU 10HU 13HU 16HU 19HU 1CHU 1FHU 22HU Seg20 02HL 05HL 08HL 0BHL 0EHL 11HL 14HL 17HL 1AHL 1DHL 20HL 23HL Seg24 02HU 05HU 08HU 0BHU 0EHU 11HU 14HU 17HU 1AHU 1DHU 20HU 23HU
DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11 DIG12
b0 XXHL Lower 4 bits
b3 b4 XXHU Higher 4 bits
b7
Anachip Corp. www.anachip.com.tw 6/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
(2) Key Matrix and Key-input Data Storage RAM The key matrix is made up of a 16 X 2 matrix, as shown below.
KEY1 KEY2
Seg10/KS10
Seg11/KS11
Seg12/KS12
Seg13/KS13
Seg14/KS14
Seg15/KS15
The data of each key is stored as follows, and is read with the read command starting from the least significant bit.
KEY1 KEY2 Seg1 / KS1 Seg5 / KS5 Seg9 / KS9 Seg13 / KS13 b0 b1 KEY1 KEY2 Seg2 / KS2 Seg6 / KS6 Seg10 / KS10 Seg14 / KS14 b2 b3 KEY1 KEY2 Seg3 / KS3 Seg7 / KS7 Seg11 / KS11 Seg15 / KS15 b4 b5 KEY1 KEY2 Seg4 / KS4 Seg8 / KS8 Seg12 / KS12 Seg16 / KS16 b6 b7
Reading Sequence
(3) LED Port Data is written to the LED port with the write command, starting from the least significant bit. "L" output when the bit of this port is 0, and "H" output when the bit is 1. The data of bits after the 5th bit are ignored.
MSB b3 b2 b1 LSB b0
LED1 Don't care LED2 LED3 LED4
Note: On power application, all the LED ports are "L" output.
(4) Commands Commands set the display mode and status of the VFD driver. The first 1 byte input to the AD6315 through the DIN pin after the STB pin has fallen is regarded as a command. If STB is set high while commands/data are transmitted, serial communication is initialized, and the commands/data being transmitted are invalid (however, the commands/data previously transmitted remain valid).
Anachip Corp. www.anachip.com.tw 7/16
Rev. A5 Dec 29, 2003
Seg16/KS16
Seg1/KS1
Seg2/KS2
Seg3/KS3
Seg4/KS4
Seg5/KS5
Seg6/KS6
Seg7/KS7
Seg8/KS8
Seg9/KS9
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
() Display mode setting commands These commands initialize the AD6315 and select the number of segments and the number of grids (1/4- to 1/12- duty, 16 segments to 24 segments). When these commands are executed, the display is forcibly turned off, and key scanning is also stopped. To resume display, the display command "ON" must be executed. If the same mode is selected, however, nothing happens.
MSB 0 0 b2 b1
LSB b0
Don't care
Display mode settings 0000: 4digits 24segments 0001: 5digits 23segments 0010: 6digits 22segments 0011: 7digits 21segments 0100: 8digits 20segments 0101: 9digits 19segments 0110: 10digits 18segments 0111: 11digits 17segments 1xxx : 12digits 16segments
Note: On power application, the 12-digit, 16-segment mode is selected.
() Data setting commands These commands set data write and data read modes.
MSB 0 1 b3 b2 b1 LSB b0
Don't care
Daat write and read mode settings 00: Write data to display memory 01: Write data to LED port 10: Read key data 11: Don't card Address increment mode settings (Display memory) 0: Increments address after data has been written 1: Fixes address. Test mode settings 0: Normal operation 1: Test mode
Note: For power application, the normal operation and address increment modes are set.
Anachip Corp. www.anachip.com.tw 8/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
() Address setting command These commands set an address of the display memory.
MSB 1 1 b5 b4 b3 b2 b1
LSB b0
Address (00H to 23H) Don't care
Note : (a) If address 24H or higher is set, data is ignored, until a valid address is set. (b) On power application, the address is set to 00H.
() Display control commands
MSB 1 0 b3 b2 b1 LSB b0
Don't care
Dimming quantity settings 000: Set pulse width to 1/16. 001: Set pulse width to 2/16. 010: Set pulse width to 4/16. 011: Set pulse width to 10/16. 100: Set pulse width to 11/16. 101: Set pulse width to 12/16. 110: Set pulse width to 13/16. 111: Set pulse width to 14/16. Turns on/off display. 0: Display off (Key scan continues (Note)) 1: Display on
Note : (a) On power application, key scanning is stopped. (b) 1/16 pulse width is set and the display is turned off.
Anachip Corp. www.anachip.com.tw 9/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
(5) Key Scanning And Display Timing
TDISP 500 s Key scan data
SEG output
DIG1
DIG2
DIG3
DIGn
DIG1
G1 1/ 16TDISP G2
G3
Gn
1 frame = TDISP X (n + 1 )
Note : One cycle of key scanning consists of two frame, and data in 1 16 X 2 matrix is stored in RAM.
(6) Key Scan Expansion 1st frame 2nd frame DIGn 1 9 2 3 4 5 6 7 8 DIG1
10 11 12 13 14 15 16
(7) Serial Communication Format Reception (command/data write)
If data continues STB
DIN
b0
b1
b2
b6
b7
CLK
1
2
3
7
8
Anachip Corp. www.anachip.com.tw 10/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
STB
DIN
b0
b1
b2
b3
b4
b5
b6
b7
CLK
1
2
3
4
5
6
7
8
tWAIT(Note)
1
2
3
4
5
6
DOUT
b0
b1
b2
b3
b4
b5
A data read command is set.
Data is read.
Transmission (data read)
Note : When data is read, a wait time tWAIT of 1 s is necessary since the rising of the eighth clock that has set the command, until the falling of the first clock that has read the data. Remark : Because the DOUT pin is an N-ch, open-drain output pin, be sure to connect an external pull-up resistor (1 k to 10 k) to this pin.
(8) Switching Characteristic Waveforms Typical Characteristics (Unless otherwise specified, TA= 25C, VDD = 5V, VEE = VDD -35V)
fOSC
OSC 50%
PWSTB STB
PWCLK CLK
PWCLK
tCLK-STB
tSETUP DIN
tHOLD
tPZL DOUT tTHZ Sn/Gn 90% 10%
tPHZ
tTHZ
Anachip Corp. www.anachip.com.tw 11/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
(9) Applications Updating display memory by incrementing address
STB
CLK
DIN
Command 1
Command 2
Command 3
Data 1
Data n
Command 4
Command 1 Command 2 Command 3 Data 1 to n Command 4
sets display mode sets data sets address transfers display data (36 bytes MAX.) controls display
Updating specific address
STB
CLK
DIN
Command 1
Command 2
Data
Command 2
Data
Command 1 sets data Command 2 sets address Data display data
Anachip Corp. www.anachip.com.tw 12/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Application Circuit
VDD
VDD R1 To Microcontroller DOUT DIN CLK STB VDD VSS VEE Grid1 to Grid4 LED LED1 LED2 LED3 LED4
R3 In the case of low-level output is display on signal. OSC R2 KEY2 Seg1/KS1 KEY1 R4
0V -30V
C
4
8
Seg16/KS16
VDD
Seg17/Grid12 to Seg24/Grid5
AD16315
Key Matrix Note (16X2)
Fluorescent Indicator Panel (FIP) (VFD)
F+
F-
Driving voltage for FIP (VFD)
Note :
Remark : R1,R4 = 1k to 10k R2 = 82k R3= 330 TO 1K C = 0.1 to 1.0F
Anachip Corp. www.anachip.com.tw 13/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Package Information
(1) Package Type: Plastic QFP-44L Dimension in millimeter (mm.).
13.2 0.5 10.0 0.5 2.7(MAX.)
33
23
34
22
10.0 0.5
13.2 0.5
44
12
1
11 0.15 TYP.
1.6 TYP.
0.3 TYP.
0.8 TYP.
0.88 TYP.
Anachip Corp. www.anachip.com.tw 14/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver
(2) Package Type: LQFP-44L
( Top View )
PIN 1 INDENT
E1
E
e 12o(4X) C D1 D A A2
b
R0.08 MIN. A1 y DETAIL A L L1 DETAIL A
0.25 GAGE PLANE
Symbol A A1 A2 b C E E1 D D1 e L L1 y
Dimensions In Millimeters Min. Nom. Max. 1.60 0.05 0.10 0.15 1.35 1.40 1.45 0.30 0.37 0.45 0.09 0.20 11.50 12.00 12.50 9.50 10.00 10.50 11.80 12.00 12.20 9.90 10.00 10.10 0.80 0.45 0.60 0.75 1.00 0 3.5 7 0.00 0.08
Dimensions In Inches Min. Nom. Max. 0.063 0.002 0.004 0.006 0.053 0.055 0.057 0.012 0.015 0.018 0.004 0.008 0.453 0.472 0.492 0.374 0.394 0.413 0.465 0.472 0.480 0.390 0.394 0.398 0.031 0.018 0.024 0.030 0.039 0 3.5 7 0.000 0.003
Anachip Corp. www.anachip.com.tw 15/16
Rev. A5 Dec 29, 2003
AD6315
1/4- to 1/12 Duty VFD Controller/Driver Marking Information
Top view
Part Number
AC AD6315 X XX XX XXX
Logo Blank: Nomal F: Lead Free Package ID code: internal Nth week: 01~52 Year: "01" = 2001 "02" = 2002
QFP44/LQFP44
Anachip Corp. www.anachip.com.tw 16/16
Rev. A5 Dec 29, 2003

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