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SC16313
VFD CONTROLLER / DRIVER
DESCRIPTION
SC16313 is a Vacuum Fluorescent Display (VFD) or Fluorescent Indicator Panel (FIP) controller/driver that is driven on a 1/4 to 1/8 duty factor. It consists of 8 segment output lines, 4 grid output lines, 4 segment/grid output lines, one display memory, control circuit, key scan circuit. Serial data is input to SC16313 via a three-line serial interface. This VFD driver is ideal as a peripheral device of a singlechip microcomputer.
SOP-28-375-1.27
FEATURES
* CMOS technology * High-voltage output * Key scanning (8 x 2 matrix) * Multiple display modes: (8 segments & 8 digits to 12 segments & 4 digits) * 8-step dimming circuitry * Serial interface (CLK, DIN, DOUT, STB) * No external resistors needed for driver outputs * Microcomputer peripheral device.
ORDERING INFORMATION
Device SC16313 Package SOP-28-375-1.27
APPLICATIONS
BLOCK DIAGRAM
DIN DOUT CLK STB Serial Data Interface
Control
SG1/KS1 SG2/KS2 SG3/KS3 SG4/KS4 SG5/KS5 Segment Driver SG6/KS6 SG7/KS7 SG8/KS8 SG9/GR8 SG10/GR7 SG11/GR6 SG12/GR5
Display Memory
OSC R
OSC
Timing Generator
GND
Key Matrix Memory
Diming Circuit
Grid Driver
GR1 GR2 GR3 GR4
Key1 Key2
VDD
GND VEE
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SC16313
ABSOLUTE MAXIMUM RATINGS (unless otherwise stated, Tamb=25C, GND=0V)
Characteristics Logic Supply Voltage Driver Supply Voltage Logic Input Voltage VFD Driver Output Voltage VFD Driver Output Current Operating Ambient Temperature Symbol VDD VEE VI VO IoVFD Topr Value -0.5 to +7 VDD +0.5 to VDD-40 -0.5 to VDD+0.5 VEE-0.5 to VDD+0.5 -40 (grid) -15 (segment) -40 to +85 Unit V V V V mA C
RECOMMENDED OPERATING CONDITIONS
(Unless otherwise stated, Tamb=-20 to +70C, GND=0V) Characteristics Logic Supply Voltage High-Level Input Voltage Low-Level Input Voltage Driver Supply Voltage Symbol VDD VIH VIL VEE Min. 3.0 0.7VDD 0 VDD-35 Typ. 5 ---Max. 5.5 VDD 0.3VDD 0 Unit V V V V
ELECTRICAL CHARACTERISTICS
(Unless otherwise stated, VDD=5V, GND=0V, VEE=VDD-35V, Tamb=25C) Characteristics Low-Level Output Voltage High-Level Output Current Symbol VOL1 IOH21 Test Condition DOUT, IOL2=4mA VO=VDD-2V SG1/KS1 to SG8/KS8 VO=VDD-2V High-Level Output Current IOH22 GR1 to GR4, SG9/GR8 to SG12/GR5 Input Current High-Level Input Voltage Low-Level Input Voltage Oscillation Frequency Dynamic Current Consumption Ii VIH VIL fOSC IDDdyn VI=VDD or VSS --R=51K Under no load Display OFF -0.7VDD -350 ----500 -1 -0.3VDD 650 5 A V V KHz mA -15 --mA Min. --3 Typ. --Max. 0.4 -Unit V mA
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SC16313
PIN CONFIGURATION
SG12/GR5 SG11/GR6 SG10/GR7 SG9/GR8 16 13 SG7/KS7
DOUT
OSC
GR1
GR2
GR3
GR4
VDD
DIN
VSS
28
27
26
25
24
23
22
21
20
19
18
17
SC16313
1 CLK
2 STB
3 KEY1
4 KEY2
5 VSS
6 VDD
7 SG1/KS1
8 SG2/KS2
9 SG3/KS3
10 SG4/KS4
11 SG5/KS5
12 SG6/KS6
PIN DESCRIPTION
Pin NO. 1 CLK Symbol Description Reads serial data at the rising edge and outputs data at the falling edge. After the STB has fallen, The data input can be processed; the first 2 STB data is regard as a command. When this pin is " HIGH" CLK is , ignored. 3, 4 5, 25 6, 24 7 to 14 15 16 to 19 20 to 23 26 27 28 KEY1 to KEY2 VSS VDD SG1/KS1 to SG8/KS8 VEE SG9/GR8 ~SG12/GR5 GR4 to GR1 OSC DOUT DIN The data input to these pins is latched at the end of display cycle. Logic ground pin Logic power supply Segment output pins. It also functions as key source. VDD - 35 V max These pins are selectable for segment or grid output Grid output pins This pin connects a resistor to VDD to determine the oscillation frequency. Outputs serial data at the falling edge of the shift clock (starting from the lower bit). Inputs serial data at the rising edge of the shift clock (starting from the lower bit).
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SG8/KS8
VEE 15 14
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SC16313
FUNCTION DESCRIPTION
DISPLAY RAM ADDRESS Data transmitted from an external device to SC16313 via the serial interface are stored in the display RAM and are assigned addresses. The RAM addresses of SC16313 are given below in 8 bits unit. SG1 00HL 02HL 04HL 06HL 08HL 0AHL 0CHL 0EHL b0 XX HL Lower 4 bits SG4 SG5 00HU 02HU 04HU 06HU 08HU 0AHU 0CHU 0EHU b3 b4 XX HU Higher 4 bits SG8 SG9 SG12 01HL 03HL 05HL 07HL 09HL 0BHL 0DHL 0FHL b7 GR1 GR2 GR3 GR4 GR5 GR6 GR7 GR8
Only the lower 4 bits of the addresses assigned to SG9 through SG12 are valid, and the higher 4 bits are ignored. SC16313 KEY MATRIX & KEY INPUT DATA STORAGE RAM SC16313 key matrix consists of 8 x 2 arrays as shown below:
KEY1 KEY2 SG1/KS1 SG2/KS2 SG3/KS3 SG4/KS4 SG5/KS5 SG6/KS6 SG7/KS7 SG8/KS8
The data of each key is stored in key-input data RAM as illustrated below. They are read by a READ command, starting from the least significant bit. When the most significant bit of the data (SG8, b7) has been read, then the least significant bit of the next data (SGI, b0) will be read.
KEY1 KEY2 KEY1 KEY2 KEY1 KEY2 KEY1 KEY2 SG1/KS1 SG2/KS2 SG3/KS3 SG4/KS4 SG5/KS5 SG6/KS6 SG7/KS7 SG8/KS8 b0 b1 b2 b3 b4 b5 b6 b7 Reading sequence
COMMANDS Commands set the display mode and status of SC16313. The first byte (b0 to b7) inputted to SC16313 via the DIN pin after STB pin has fallen is regarded as a command. If for some reason the STB pin is made " HIGH" while data or commands are being transmitted, the serial communication is initialized, and the
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SC16313
data/command being transmitted is considered invalid. (However, the data/command already transmitted remains valid) Command 1: display mode setting command This command initializes the SC16313 and selects the number of segments and number of grids (4 to 8 grids, 12 to 8 segments). When this command is executed, display is forcibly turned off, and key scanning is also stopped. To resume display, a display ON command must be executed. SC16313 provides 4 display mode settings as shown in the diagram below. The bits 4 to 6 (b3 to b5) are ignored, bits 7 & 8 (b6 to b7) are given a value of " . 0" On power application, the 8-digit, 8-segment mode is selected.
MSB 00 LSB - b2 b1 b0 Display Mode Settings: 000: 4 digits, 12 segments 001: 5 digits, 11 segments 010: 6 digits, 10 segments 011: 7 digits, 9 segments 100: 8 digits, 8 segments
Don't care
Command 2: data setting command This command sets data write or data read modes. The data setting command, the bits 6 and 5 (b5, b4) are ignored, bit 8 and bit 7 (b7, b6) are given the value of " . Please refer to the diagram below. 01" On power application, the normal operation mode and address increment mode are set.
MSB 01 LSB - b3 b2 b1 b0 Data write & read mode settings: 00: write data to display memory 10: read key data Address increment mode settings (display memory): 0: increment address after data has been written 1: fixes address Test mode settings: 0: normal operation mode 1: test mode
Don't care
Command 3: address setting command This command sets an address of the display memory. The address is considered valid if it has a value of " 00H"to " 0FH" If the address is set to 10H or higher, the data is ignored until a valid address is set. . On power application, the address is set to " 00H" . Please refer to the diagram below.
MSB LSB 1 1 0 b4 b3 b2 b1 b0 Address: 00H to 0FH
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SC16313
Command 4: display control command This command is used to turn ON or OFF a display. It also used to set the pulse width. Please refer to the diagram below. ON power application, the 1/16 pulse width is set and the display is turned OFF (the key scanning starts).
MSB 10 LSB - b3 b2 b1 b0 Diming quantity settings: 000: pulse width = 1/16 001: pulse width = 2/16 010: pulse width = 4/16 011: pulse width = 10/16 100: pulse width = 11/16 101: pulse width = 12/16 110: pulse width = 13/16 111: pulse width = 14/16 Turns on / off display: 0: display OFF 1: display ON
-
Don't care
KEY SCANNING AND DISPLAY TIMING
The key scanning and display timing diagram is given below. One cycle of key scanning consists of 2 frames. In the first frame, those keys connected to KS1~KS4 are scanned, while the second frame scans KS5~KS8. The data of the 8 x 2 matrix is stored in the key-input RAM.
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SC16313
SERIAL COMMUNICATION FORMAT
The following diagram shows the SC16313 serial communication format. The DOUT pin is an N-channel, opendrain output pin. Therefore, it is highly recommended that an external pull-up resistor (1k to 10k) must be connected to DOUT. RECEPTION (COMMAND/DATA WRITE)
If data continues STB DIN CLK b0 1 b1 2 b2 3 b6 7 b7 8
TRANSMISSION (DATA READ)
It must be noted that when the data is read, a waiting time twait of 1s is necessary between the rising of the eighth clock that has set the command and the falling of the first clock that has read the data.
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SC16313
TYPICAL APPLICATION CIRCUIT
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SC16313
PACKAGE OUTLINE
SOP-28-375-1.27 UNIT: mm
10.20.4
7.60.3
1.27 0.45 17.750.25 2.8 MAX
0.150.05
16.51
HANDLING MOS DEVICES:
Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: * Persons at a work bench should be earthed via a wrist strap. * Equipment cases should be earthed. * All tools used during assembly, including soldering tools and solder baths, must be earthed. * MOS devices should be packed for dispatch in antistatic/conductive containers.
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9.525

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