STM86312 Fast Delivery |IC PHOENIX CO.,LIMITED

STM86312 ,1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVERPin Configuration (TOP VIEW)2/16STM86312Table 1: Pin DescriptionPlN N° SYMBOL NAME AND FUNCTION1, 2 ..
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STM86312
1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
1/16May 2004 MANY DISPLAY MODES(11 SEGMENTS& DIGITSTO16 SEGMENTS&4 DIGITS) KEY SCANNING(6x4 MATRIX) DIMMING CIRCUIT (EIGHT STEPS) HIGH-VOLTAGE OUTPUT (VDD –35V MAX) LED PORTS(4 CHS, 20mA MAX) GENERAL PURPOSE INPUT PORT(4 bits) NO EXTERNAL RESISTOR NECESSARY
FOR DRIVER OUTPUT (P-CH OPEN DRAIN PULL DOWN RESISTOR OUTPUT) SERIAL INTERFACE (CLK, STB, DIN,DOUT)
DESCRIPTION
The STM86312isa VFD (Vacuum Fluorescent
Display) controller/driver thatis drivenona1/4to
1/11-duty factor.It consistsof 11-segments output
lines,6 grid output lines,5 segments/grid output
drive lines,a display memory,a control circuit, and key scan circuit. Serial data are inputto the
STM86312 througha three-line serial interface.
This VFD controller/driveris idealasa peripheral
devicefora single-chip microcomputer.
ORDERING CODES
STM86312
1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER
Rev.1
STM86312
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Figure1: Block Diagram
Figure2: Pin Configuration (TOP VIEW)
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Table1:Pin Description
Table2: Absolute Maximum Ratings(TA= 25°C, VSS =0V)
AbsoluteMaximum Ratingsare those values beyond which damagetothe devicemay occur. Functional operation under theseconditionis
not implied.
Table3: Thermal Data
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Table4: Recommended Operating Conditions
Maximum power consumption PMAX= VFD driver dissipation+RL dissipation+ LED driver dissipation+
dynamic power consumption.
Where segment current=3 mA, grid current=15 mA, and LED current=20 mA,
VFD driver dissipation= numberof segmentsx6+ numberof grids/(numberof grids+1)x30 (mW)L dissipation=(VDD-VEE)2/50x (segment+1) (mW)
LED driver dissipation= numberof LEDsx20 (mW)
Dynamic power consumption= VDDx5 (mW)
Example
Where VEE =-25V, VDD=5V, andin 16-segment and 6-digit modes,
VFD driver dissipation=16x6+6/7x30= 122L dissipation=302/50x17= 306
LED driver dissipation=4x20=80
Dynamic power consumption=5x5=25
Total 553 mW.
Table5: Electrical Characteristics (VDD=4.5to 5.5V, VSS=0V, VEE =VDD- 35V,TA=-20to 70°C,
unless otherwise noted. Typical valuesareatTA= 25°C)
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Table6: Switching Characteristics(VDD=4.5to 5.5V,VSS =0V,VEE=VDD -35V,TA=-20to 70°C,
unless otherwise noted. Typical valuesareatTA= 25°C)
Table7: Timing Characteristics(VDD=4.5to 5.5V,TA=-20to 70°C, unless otherwise noted. Typical
valuesareatTA= 25°C)
NOTE1: Referto page Serial Communication Format.
DISPLAY RAM ADDRESS AND DISPLAY MODE
The display RAM storesthe data transmitted froman external devicetothe STM86312 throughthe serial
interface; addressesareas follows,in 8-bits unit:
"0"in memory means VEEon output;"1"in memory meansVDDon output.
Seg1 Seg4 Seg8 Seg12 Seg16 DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11 b3b4 b7
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Figure3: Key Matrix And Key-input Data Storage Ram
Thekey matrixisof6x4 configuration,as shown below
The dataof eachkeyare storedas illustrated below, andare readbythe appropriate read command,
starting fromthe least significantbit
LED PORT
Dataare writtentothe LED portbya write command, starting fromthe least significantbitofthe port.
Whenabitofthis portis0,the corresponding LED lights; whenthebitis1,the LED goesoff. The dataof
bits5 through8are ignored. power application,allthe LEDs remain dark.
KEY1 KEY4 KEY1 KEY4 ↓ b3b4 b7
MSB LSB
LED1
LED2
LED3
LED4
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STM86312
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The SW dataare readbythe appropriate read command, starting fromthe least significantbit. Bits5
through8ofthe SW dataare0.
COMMANDS command setsthe display mode and statusofthe VFD driver.
The first1 byte inputtothe STM86312 throughtheDINpin afterthe STBpin has fallenis regardedasa
command.If STBisset high while commands/data are transmitted, serial communicationis initialized,
andthe commands/data being transmittedare invalid (however,the commands/data already transmitted
remain valid).
(1) DISPLAY MODE SETTING COMMAND
This command initializesthe STM86312 and selectsthe numberof segments and numberof grids (1/4to
1/11 duty,11 segmentsto16 segments).
When this commandis executed, displayis forcibly turnedoff, and key scanningis also stopped.To
resume display,the displayON command mustbe executed.Ifthe same modeis selected, however,
nothingis performed. power application,the 11-digit 11-segment modeis selected.
MSB LSB
SW1
SW2
SW3
SW4
MSB LSB
DISPLAY MODE SETTING
000:4 digits,16 segments
001:5 digits,16 segments
010:6 digits,16 segments
011:7 digits,15 segments
100:8 digits,14 segments
101:9 digits,13 segments
110:10 digits,12 segments
111:11 digits,11 segments
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(2) DATA SETTING COMMAND
This command sets data write and data read modes. power application,the normal operation mode and address increment modeareset.not use STM86312in test mode.
(3) ADDRESS SETTING COMMAND
This command setsan addressofthe display memory address 16Hor higheris set,the dataare ignored, untila correct addressis set. power application,the addressissetto 00H.
(4) DISPLAY CONTROL COMMAND power application,the 1/16-pulse widthisset andthe displayis turnedoff.On power application,key scanningis stopped.
MSB LSB
DATA WRITE AND READ MODE SETTING: Write datato display memory: Write datato LEDport: Readkey data: ReadSW data
ADDRESS INCREMENT MODE SETTING
(DISPLAY MEMORY) Increments address after datahas been
written Fixed address
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MSB LSB
Address (00H-15H)
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MSB LSB
DISPLAY MODE SETTING
000:Set Pulse Widthto 1/16
001:Set Pulse Widthto 2/16
010:Set Pulse Widthto 4/16
011:SetPulse Widthto10/16
100:Set Pulse Widthto 11/16
101:Set Pulse Widthto 12/16
110:SetPulse Widthto13/16
111:Set Pulse Widthto 14/16
TURNS ON/OFF DISPLAY Display OFF (Key Scan Continues*) DisplayON
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Partno	Mfg	Dc	Qty	Available	Descript
STM86312	ST	N/a	1728	avai	1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER