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SC16315
VFD CONTROLLER/DRIVER
DESCRIPTION
The SC16315 is a FIP (Fluorescent Indicator Panel, or Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 or 1/12 duty factor. It has 16 segment outputs, 4 grid outputs, 8 segment/grid outputs, a display memory, a control circuit, and a key scan circuit. Serial data comes from a three-line serial interface. This FIP controller/driver is ideal as a peripheral device for a single-chip microcomputer.
QFP44-10 x10-0.8(S)
FEATURES
* Multiple display modes (16-segment & 12-dight 4-digit). * Key scanning (16x2 matrix). * Dimming circuit (eight steps). * High-voltage output (VDD - 35V max). * LED ports (4 chs., 20 mA max). * No external resistors necessary for driver outputs (P-ch open-drain + pull-down resistor output) * Serial interface (CLK, STB, DIN, DOUT) to 24-segment &
ORDERING INFORMATIONS
Device SC16315 Package QFP-44-10 X 10-0.8(S)
APPLICATIONS
* Microcomputer peripheral device
BLOCK DIAGRAM
7 6 8 9
DIN DOUT Serial Data Interface
Command Decoder
Dimming Circuit
Seg1/ KS1 Segment Driver
14
Seg16/ KS16 Seg17/ Grid12
29 31
CLK STB
Display Memory
24 bits Output Latch Data Selector Multiplexed Driver
Timing Generator
Seg24/ Grid5
38 42 39
5
OSC OSC Key Data Memory 4-Bits Latch Grid4 12 Bits Shift Register Grid Driver Grid1
LED1
LED4
K1
K2
VDD
VSS
VEE
1
4
10
11
43
44
30
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SC16315
ABSOLUTE MAXIMUM RATING (Unless otherwise specified, Tamb=25C, VSS=0V)
Characteristics Logic Supply Voltage Driver Supply Voltage Logic Input Voltage FIP Driver Output Voltage LED Driver Output Current FIP Driver Output Current Power Dissipation Storage Temperature Operating Ambient Temperature Symbol VDD VEE VI1 VO2 IO1 IO2 PD TSTG Tamb Value -0.5 ~ +6.0 VDD + 0.5 ~ VDD - 40 -0.5 ~ VDD + 0.5 VEE - 0.5 ~ VDD + 0.5 20 -40 (grid); -15 (segment) 800 * -65 ~ +150 -40 ~ + 85 Unit V V V V mA mA mW C C
* Note: Derate at -6.4 mW/C at Tamb=25C or higher.
RECOMMENDED OPERATING RANGE (Tamb= -20 ~ 70 C, VSS=0V)
Characteristics Logic Supply Voltage High-Level Input Voltage Low-Level Input Voltage Driver Supply Voltage dynamic power consumption Where segment current = 3mA, grid current = 15mA, and LED current = 20mA, FIP 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) Symbol VDD VIH VIL VEE Min. 3 0.7VDD 0 0 Typ. 5 ---Max. 5.5 VDD 0.3VDD VDD-35 Unit V V V V
Maximum power consumption PMAX. = FIP driver dissipation + RL dissipation + LED driver dissipation +
ELECTRICAL CHARACTERISTICS (Tamb= 25 C, VDD =5V, VSS=0V, VEE=VDD-35V)
Characteristics High-Level Output Voltage Low-Level Output Voltage Low-Level Output Voltage High-Level Output Current High-Level Output Current Oscillation Frequency Symbol VOH1 VOL1 VOL2 IOH21 IOH22 FOSC Test conditions LED1- LED4, IOH1=-12mA LED1- LED4, IOL1 =+15mA DOUT, IOL2=4mA VO=VDD-2V, Seg1/KS1 to Seg16/KS16 VO=VDD-2V, Grid1 to Grid4 Seg17/Grid12 to Seg24/Grid5 R=82K Min. VDD-1 ---3 -15 300 Typ. -----500 Max. -1 0.4 --650 Unit V V V mA mA KHz
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SC16315
Characteristics Schmitt-Trigger Transfer Voltage(+) Schmitt-Trigger Transfer Voltage(-) Hysteresis Voltage Input Current Dynamic Current Consumption Symbol VT+ VTVH II IDDdyn Test conditions VDD=5V (DIN,CLK,STB) VDD=5V (DIN,CLK,STB) VDD=5V (DIN,CLK,STB) VI=VDD or VSS Under no load, Display Off Min. 2.7 0.7 1.4 Typ. 3.0 1.0 2.0 Max. 3.3 1.3 1 5 Unit V V V A mA
ELECTRICAL CHARACTERISTICS (Tamb= 25 C, VDD =3.3V, VSS=0V, VEE=VDD-35V)
Characteristics High-Level Output Voltage Low-Level Output Voltage Low-Level Output Voltage High-Level Output Current Symbol VOH1 VOL1 VOL2 IOH21 Test conditions LED1-LED4,IOH1=-6mA LED1-LED4,IOL1=+15mA DOUT,IOL2=4mA VO=VDD-2V,SEG1/KS1 To SEG16/KS16 VO=VDD-2V, Grid1 to High-Level Output Current Oscillation Frequency Schmitt-Trigger Transfer Voltage(+) Schmitt-Trigger Transfer Voltage(-) Hysteresis Voltage Input Current Dynamic Current Consumption IOH22 FOSC VT+ VTVH II IDDdyn Grid4 ,SEG17/Grid12 To SEG24/Grid5 R=82K VDD=3.3V (DIN,CLK,STB) VDD=3.3V (DIN,CLK,STB) VDD=3.3V (DIN,CLK,STB) VI=VDD or VSS Under no load Display Off 300 1.8 0.2 1.0 500 2.0 0.4 1.6 650 2.2 0.6 1 3 KHz V V V A mA -6 mA Min. VDD-1 -1.5 Typ. Max. 1 0.4 Unit V V V mA
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SC16315
PIN CONFIGURATION
Seg24/Grid5 Seg23/Grid6 Seg22/Grid7 Seg21/Grid8 35 Seg20/Grid9 34 33 Seg19/Grid10 32 Seg18/Grid11 31 Seg17/Grid12 30 VEE 29 Seg16/KS16 28 Seg15/KS15 27 Seg14/KS14 26 Seg13/KS13 25 Seg12/KS12 24 Seg11/KS11 23 Seg10/KS10 12 VSS 13 VDD 14 Seg1/KS1 15 Seg2/KS2 16 Seg3/KS3 17 Seg4/KS4 18 Seg5/KS5 19 Seg6/KS6 20 Seg7/KS7 21 Seg8/KS8 22 Seg9/KS9
Grid2
Grid3 40
44 LED1 1 LED2 2 LED3 3 LED4 4 OSC 5 DOUT 6 DIN 7 CLK 8 STB 9 KEY1 10 KEY2 11
43
Grid1
VDD
VSS
42
41
39
Grid4
38
37
36
SC16315
PIN DESCRIPTION
Pin No. 7 6 Pin Name DIN DOUT low order bit. Data output pin. Output serial data at the falling edge of the shift clock, starting from low order bit. This is N-ch open-drain output pin. Strobe pin. Initializes serial interface at the rising or falling edge of the SC16315. It then waits for reception of a command. Data input after STB has 9 STB fallen 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 5 14 ~ 29 39~42 CLK OSC Seg1/KS1 to Seg16/KS16 Grid1 to Grid4 Clock input pin. Reads serial data at the rising edge, and outputs data at the falling edge. Oscillator pin. Determine the oscillation frequency by the resistor connecting this pin and GND (VSS). High-voltage output (segment). Segment output pins (Dual function as key source). High-voltage output (grid). Grid output pins. Description Data input pin. Input serial data at rising edge of shift clock, starting from the
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SC16315
Pin No. 31~38 1 ~4 10 ~ 11 13, 43 12, 44 30 Pin Name Seg17/Grid12 to Seg24/Grid5 LED1 to LED4 KEY1 to KEY2 VDD VSS VEE Description High-voltage output (segment/grid). Segment or grid driving. LED output pin. CMOS output. +20mA max. Key data input. Data input to these pins is latched at the end of the display cycle. Logic power pin. 5V10% Logic ground. Connect this pin to system GND. Pull-down level. VDD-35V max.
FUNCTIONAL DESCRIPTION
1. DISPLAY RAM ADDRESS AND DISPLAY MODE The display RAM stores the data transmitted from an external device to the SC16315 through the serial interface, and is assigned addresses as follows, in 8 bits unit: Seg1 Seg4 00HL 03HL 06HL 09HL 0CHL 0FHL 12HL 15HL 18HL 1BHL 1EHL 21HL 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 b0 Seg16 01HU 04HU 07HU 0AHU 0DHU 10HU 13HU 16HU 19HU 1CHU 1FHU 22HU b3 b4 XXHL Lower 4 bits XXHU Higher 4 bits b7 Seg20 02Hv 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
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 Seg16/KS16 Seg1/KS1 Seg2/KS2 Seg3/KS3 Seg4/KS4 Seg5/KS5 Seg6/KS6 Seg7/KS7 Seg8/KS8 Seg9/KS9
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SC16315
The data of each key is stored as illustrated below, and is read with the read command, starting from the least significant bit. KEY1 KEY2 KEY1 KEY2 KEY1 KEY2 KEY1 KEY2 Seg1/KS1 Seg5/KS5 Seg9/KS9 Seg13/KS13 b0 ------- b1 3. LED PORT Data is written to the LED port with command, starting from the least port's 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 5 bit are ignored.
MSB
b3 b2 b1
th
Seg2/KS2 Seg6/KS6 Seg10/KS10 Seg14/KS14 b2 ------- b3
Seg3/KS3 Seg7/KS7 Seg11/KS11 Seg15/KS15 b4-------- b5
Seg4/KS4 Seg8/KS8 Seg12/KS12 Seg16/KS16 b6 -------- b7 Reading sequence
LSB
b0
LED1 Don't care LED2 LED3 LED4
Remark: On power application, all the LED ports are "L" output. 4. COMMANDS Commands set the display mode and status of the FIP driver. The first 1 byte input to the SC16315 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). (1) Display mode setting commands These commands initialize the SC16315 and select the number of segments and grids (1/4- to 1/12- duty, 16 segments to 24 segments). When these commands are executed, the display and key scanning are forcibly turned off. Therefore, in order to resume display, the display command "ON" must be executed. If the same mode is selected, however, nothing will happen.
MSB 0 0 b2 b1 LSB b0
Display mode settings Don't care 0000: 4 digits, 24 segments 0001: 5 digits, 23 segments 0010: 6 digits, 22 segments 0011: 7 digits, 21 segments 0100: 8 digits, 20 segments 0101: 9 digits, 19 segments 0110: 10 digits, 18 segments 0111: 11 digits, 17 segments 1xxx: 12 digits, 16 segments
On power application, the 12-digit, 16-segment mode is selected.
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SC16315
(2) Data setting commands These commands set data write and data read modes.
MSB 0 1 b3 b2 b1 LSB b0
Don't care
Data write and read mode settings 00: Write data to display memory 01: Write data to LED port 10: Read key data 11: Don't care 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
Remark On power application, the normal operation and address increment modes are set. (3) Address setting commands These commands set an address of the display memory.
MSB 1 1 b5 b4 b3 b2 b1 LSB b0
Address (00H-23H)
Remarks 1. If address 24H or higher is set, data is ignored, until a valid address is set. 2. On power application, the address is set to 00H. (4) Display control commands
MSB 1 0 b3 b2 b1 LSB b0
Dimming quantity settings Don't care 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 continuesNote) 1: Display on
Note On power application, key scanning is stopped. Remark On power application, the 1/16 pulse width is set and the display is turned off.
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SC16315
KEY SCANNING AND DISPLAY TIMING
TDISP=500s Key scan data
SEG output
DIG1
DIG2
DIG3
DIGn
DIG1
G1
G2
1/16 TDISP
G3
Gn
1 frame=TDISPx(n+1)
Remark One cycle of key scanning consists of two frames, and data in a 16 x 2 matrix is stored in RAM. Key Scan Expansion
1st frame DIGn 2nd frame 9 10 11 12 13 14 15 16 12345678 DIG1
SERIAL COMMUNICATION FORMAT
Reception (command/data write)
If data continues STB
DIN
b0
b1
b2
b6
b7
CLK
1
2
3
7
8
Transmission (data read)
STB DIN CLK DOUT A data read command is set. 1 b0 2 b1 3 b2 4 b3 5 b4 6 b5 7 b6 8 b7
Note
tWAIT
1 b0
2 b1
3 b2
4 b3
5 b4
6 b5
Data is read.
Note 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. Remark Be sure to connect an external pull-up resistor (1k to 10k) to this pin because the Dout pin is an Nch , open-drain output pin .
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SC16315
SWITCHING CHARACTERISTIC WAVEFORM
fOSC
OSC
50%
PWSTB STB PWCLK CLK PWCLK
tCLK-STB
tSETUP
DIN
tHOLD
tPZL
DOUT
tPZL
tTHZ
Sn/Gn 90% 10%
tTZH
APPLICATIONS
Updating display memory by incrementing address
STB
CLK
DIN
Command 1
Command 2
Command 3
Data 1
Data n
Command 4
Command1: sets display mode Command2: sets data Command3: sets address Data 1 to n: transfers display data (36 bytes max.) Command4: controls display Updating specific address
STB
CLK
DIN
Command 1
Command 2
Data
Command
Data
Command1: sets data Command2: sets address Data: display data
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SC16315
TYPICAL APPLICATION CIRCUIT
VDD
VDD LED R1 LED1 LED2 LED3 DOUT DIN CLK STB Seg17/Grid12 to Seg24/Grid5 Grid1 to Grid4
R3 In the case of low-level output is display on signal. LED4
OSC R2 KEY2 KEY1 R4
To Microcontroller
SC16315
Seg16/KS16
-30V
VEE
4
8
Seg1/KS1 Key Matrix Note (16 x 2) F-
+5V 0V
C
VDD VSS
Fluorescent Indicator Panel (FIP) (VFD)
F+
Driving voltage for FIP(VFD)
Note
=
Remark R1,R4=1k to 10k R2=82K R3=330 to 1k C=0.1to 10F
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SC16315
PACKAGE OUTLINE
QFP-44-10x10-0.8(S) UNIT: mm
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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