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SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
GENERAL DESCRIPTION
SM6311 is a Vacuum Fluorescent Display (VFD) Controller driven on a 1/8 to 1/16 duty factor. Twelve segment output lines, 8 grid output lines, 8 segment/grid output drive lines, key scan, one display memory, IC control circuit are all incorporated in a single chip. This SM6311 is ideal as a peripheral device of a single chip microcomputer.
SM6311
FEATURES
* Multiple Display Modes * High Voltage Output * Key Scanning * General Purpose Input Ports (4 bit) * Dimming Circuitry (8 segment) * LED Display Ports(5 outs, 20mA max) * No external Resistors Needed for Driver Outputs * Serial Interface for controller
APPLICATIONS
* Audio System * Car Stereo * VCD * DVD * VCR * TV
PIN DIAGRAM ( TOP VIEW)
Sg19/G10 Sg18/G11 Sg17/G12 Sg16/G13 Sg15/G14 Sg14/G15 Sg13/G16 Sg20/G9
G5 G4 G3 G2 G1 VDD LED5 LED4 LED3 LED2 LED1 GND OSC
39 38 37 36 35 34 33 32 31 30 29 28 27 40 26 41 42 43 44 45 46 47 48 49 50 51 52 1 2 3 4 5 6 7 8 9 10 11 25 24 23 22 21 20 19 18 17 16 15 14 12 13
VDD
VEE
G6
G7
G8
Sg12/KS12 Sg11/KS11 Sg10/KS10 Sg9/KS9 Sg8/KS8 Sg7/KS7 Sg6/KS6 Sg5/KS5 Sg4/KS4 Sg3/KS3 Sg2/KS2 Sg1/KS1 VDD
NC
CLK
STB
S1
S2
S3
S4
K1
K2
K3
Page 1
DOUT
DIN
V.1.2, MAY,2003
K4
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
BLOCK DIAGRAM
Decoder DIN DOUT CLK STB VDD R OSC Timing Gen Serial Data I/F
Dimming Ckt Segment Driver
SG1 12 SG12 ~ SG13/ Grid16 SG20/ Grid9 ~ Grid1 Grid Driver Grid8 ~
20 Display Memory 20bits*16words 20 bit 8 Latch
Data Selector
8 8
Seg/Grid Driver
K1 4 ~ K4 S1 ~ S4 4 4 bit Latch
Key Memory (12*4)
16 bit Shift Register 16
8
5 bit Latch
Power Ckt
LED1 ~ LED5
VDD GND VEE (+5V) (0V) (-30V)
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V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
PIN DESCRIPTION
SYMBOL S1 to S4 DOUT DIN GND CLK STB K1 to K4 VDD Sg1/KS1~ Sg12/KS12 Sg12/G16~ Sg20/G9 VEE G1~G8 LED1~LED5 OSC
PIN NAME Switch Input Data Output Data Input Logic Ground Clock Input Strobe Key data input Logic Power Segment/Key Segment/Grid Pull Down Level Grid LED Output Oscillator Pin
PIN NO. 1 to 4 5 6 7,51 8 9 10 to 13 14, 33, 45 15 to 26 27 to 32 35 to 36 34 37 to 44 46 to 50 52
FUNCITON DESCRIPTION 4 bit general-purpose input port. Outputs serial data at falling edge of shift clock, starting from lower bit. Input serial data at rising edge of shift clock, starting from lower bit. Connect this pin to GND of system. Reads serial data at rising edge, and outputs data at falling edge. While STB is low, Data is valid; while STB is high, CLK is ignored. Data input to these pins is latched at end of display cycle. 5V+10%. Segment output pins (Dual function as key source). These pins are selectable for segment or grid output. VDD-35V max. Grid output pins CMOS output. +20 mA max. Connect resistor for determining oscillation frequency to this pin.
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V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
Display RAM Address and Display Mode
The display RAM stores the data transmitted from an external device to the SM6311 through the serial interface, and is assigned addresses as follows, in units of 8 bits : Seg1 Seg4 00 HL 03 HL 06 HL 09 HL 0C HL 0F HL 12 HL 15 HL 18 HL 1B HL 1E HL 21 HL 24 HL 27 HL 2A HL 2D HL b0 XX HL b3 b4 Seg8 00 HU 03 HU 06 HU 09 HU 0C HU 0F HU 12 HU 15 HU 18 HU 1B HU 1E HU 21 HU 24 HU 27 HU 2A HU 2D HU b7 XX HU Seg12 01 HL 04 HL 07 HL 0A HL 0D HL 10 HL 13 HL 16 HL 19 HL 1C HL 1F HL 22 HL 25 HL 28 HL 2B HL 2E HL Seg16 01 HU 04 HU 07 HU 0A HU 0D HU 10 HU 13 HU 16 HU 19 HU 1C HU 1F HU 22 HU 25 HU 28 HU 2B HU 2E HU Seg20 02 HL 05 HL 08 HL 0B HL 0E HL 11 HL 14 HL 17 HL 1A HL 1D HL 20 HL 23 HL 26 HL 29 HL 2C HL 2F HL DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11 DIG12 DIG13 DIG14 DIG15 DIG16
Lower 4 bits Higher 4 bits
Only the lower 4 bits of the addresses assigned to Seg17 through Seg20 are valid, and the higher 4 bits are ignored.
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V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
SW DATA
The SW data is read by a read command, starting from the least significant bit. Bits 5 through 8 of the SW data are 0. MSB 0 0 0 0 b3 b2 b1 LSB b0 sw1 sw2 sw3 sw4
COMMAND
A command sets the display mode and status of the FIP driver. The first 1 byte input to the SM6311 through the DIN pin after the STB pin has fallen is regarded as a command. If STB is made high while a command / data is transmitted, serial communication is initialized, and the command / data being transmitted is invalid ( however, the command / data already transmitted remains valid ). (1) Display mode setting command The command initializes the SM6311 and selects the number of segments and number of grids ( 1/8 to 1/16 duty, 12 segments to 20 segments ). When this command is executed, display is forcibly tuned off, and key scanning is also stopped. To resume display, a display ON command must be executed. If the same mode is selected, however, nothing is performed. MSB 0 0 b3 b2 b1 LSB b0
Dont's care
Selects display mode 0xxx : 8 digits, 20 segments 1000 : 9 digits, 19 segments 1001 : 10 digits, 18 segments 1010 : 11 digits, 17 segments 1011 : 12 digits, 16 segments 1100 : 13 digits, 15 segments 1101 : 14 digits, 14 segments 1110 : 15 digits, 13 segments 1111 : 16 digits, 12 segments
On power application, the 16-digit, 12-segment mode is selected.
Page 5
V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
DISPLAY CONTROL COMMAND
MSB 1 0 b3 b2 b1
LSB b0
Dont's care
Sets dimming quantity 000 : Sets pulse width to 1/16 001 : Sets pulse width to 2/16 010 : Sets pulse width to 4/16 011 : Sets pulse width to 10/16 100 : Sets pulse width to 11/16 101 : Sets pulse width to 12/16 110 : Sets pulse width to 13/16 111 : Sets pulse width to 14/16
Turns on / off display. 0 : Display off ( key scan contiunes * ) 1 : Display on
*: On power application, key scanning is stopped.
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V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
SERIAL COMMUNICATION FORMAT
Reception ( command / data write )
STB
DIN
b0
b1
b2
b6
b7
CLK
1
2
3
7
8
Transmission ( data read )
STB
DIN
b0
b1
b2
b3
b4
b5
b6
b7
CLK DOUT
1
2
3
4
5
6
7
8 tWAIT*
1
2
3
4
5
6
b0
b1
b2
b3
b4
b5
Data reading command is set.
Data reading starts.
Because the DOUT pin is an N-ch, open-drain output pin, be sure to connect an external pull-up resistor to this pin ( 1 K to 10 K ).
* : When data is read, a wait time tWAIT of 1s 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.
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V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
ABSOLUTE MAXIMUM RATINGS
PARAMETER Logic Supply Voltage Driver Supply Voltage Logic Input Voltage VFD Driver Output Voltage LED Driver Output Current VFD Driver Output Current SYMBOL VDD VEE VI VO IOLED IOVFD (Ta=25oC, GND=0V) RATING UNIT -0.5 to +7 VDD+0.5 to VDD-30 -0.5 to VDD+0.5 VEE-0.5 to VDD+0.5 +25 -40(grid) / -15(segment) V V V V mA mA
RECOMMENDED OPERATING CONDITIONS
(Ta=-20 to +70oC, GND=0V) TYP. MAX. Unit 5 5 VDD 0.3VDD VDD-35 V V V V
PARAMETER Logic Supply Voltage High-Level Input Voltage Low-Level Input Voltage Driver Supply Voltage
SYMBOL VDD VIH VIL VEE
MIN. 4.5 0.7VDD 0 0
Page 8
V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
DC/AC ELECTRICAL CHARACTERISTIC
(VDD=5V, GND=0V, VEE=VDD-35V, TA =25, unless otherwise noted)
PARAMETER High-Level Output Voltage Low-Level Output Voltage Low-Level Output Voltage High-Level Output Current High-Level Output Current High-Level Input Voltage Low-Level Input Voltage Oscillation Frequency SYMBOL VOHLED VOLLED VOLDout IOHSg VOHGr VIH VIL fosc MIN. 0.9VDD -3 -15 0.7VDD 350 TYP. 500 MAX. 1 0.4 0.3VDD 650 UNIT V V V mA mA V V KHz TEST CONDITIONS IOHLED=-1mA, LED1 to LED5 IOLLED=+20mA, LED1 to LED5 DOUT,IOLDout=4mA VO=VDD2V, Seg1
to
Seg12
VO=VDD2V, Grid1 to Grid8, Seg13 / Grid16 to Seg20 / Grid9 R=51K
SWITCHING CHARACTERISTICS ( Ta=-20 to +70, VDD=4.5 to 5.5V, VEE=-30V )
PARAMETER Oscillation Frequency Propagation Delay Time SYMBOL tOSC tPLZ tPZL tTZH1 Rise Time Fall Time Maximun Clock Frequency Input Capacitance tTZH2 tTHZ fmax. CI 1 15 MIN. 350 TYP. 500 MAX. 650 300 100 2 0.5 120 UNIT KHz ns ns s s s MHZ pF TEST CONDITIONS R=56K CLK DOUT CL=15pF, RL=10K Seg1 to Seg12 Grid1 to Grid8 , Seg13 / Grid16 to Seg20 / Grid9 CL=300pF, Segn, Gridn CL=300pF Duty=50%
TIMING CONDITIONS ( Ta=-20 to +70, 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 MIN. 400 1 100 100 1 1 TYP. MAX. UNIT ns s ns ns s s CLK CLK STB CLK TEST CONDITIONS
Page 9
V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
APPLICATIONS
Updating display memory by incrementing address
STB CLK DIN
Command 1 Command 2 Command 3 Data 1 Data n Command 4
Command 1 : sets display mode Command 2 : sets data Command 3 : sets address Data 1 to n : transfers display data (48 bytes max.) Command 4 : controls display Updating specific address
STB CLK DIN
Command 1 Command 2 Data Command 2 Data
Command 1 : sets date Command 2 : sets address Data : display data
Page 10
V.1.2, MAY,2003
SAMHOP Microelectronics Corp.
VFD CONTROLLER / DRIVER
SM6311
PACKAGE SPEC.
52 PINS QFP DIMENSION 17.20 + 0.25 14.00
39
27 2.75 + 0.1 2.70 + 0.20 17.20 + 0.25 0.8 + 0.2 0.35 + 0.1 1.60
40
26
Index
52
14
1 1.00
13
Note: Controlling dimensions are in millimeters (MM).
14.00
Page 11
V.1.2, MAY,2003

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