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1/4 to 1/11 DUTY FIP(VFD) CONTROLLER/DRIVER
DESCRIPTION
The SC16312 is a FIP (Fluorescent Indicator Panel, or Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 or 1/11 duty factor. It consists of 11 segment output lines, 6 grid output lines, 5 segment/grid output drive lines, a display memory, a control circuit, and a key scan circuit. Serial data is input to the SC16312 through a three-line serial interface. This FIP controller/driver is ideal as a peripheral device for a single-chip microcomputer.
SC16312
FEATURES
* Multiple display modes (11-segment & 11-dight to 16-segment & 4-digit). * Key scanning (6x4 matrix). * Dimming circuit (eight steps). * High-voltage output (VDD - 35V max). * LED ports (4 chs., 20 mA max). * General-purpose input port (4 bits) * No external resistors necessary for driver outputs (P-ch open-drain + pull-down resistor output) * Serial interface (CLK, STB, DIN, DOUT)
QPF-44-10x10-0.8
PAD CONFIGURATION
LED2 LED3 LED4 Grid1 Grid2 Grid3 35 LED1 OSC 44 SW1 1 SW2 2 SW3 3 SW4 4 DOUT 5 DIN 6 VSS 7 CLK 8 STB 9 KEY1 10 KEY2 11 12 KEY3 13 KEY4 14 VDD 15 Seg1/KS1 16 Seg2/KS2 17 Seg3/KS3 18 Seg4/KS4 19 Seg5/KS5 20 Seg6/KS6 21 Seg7 22 Seg8 43 VSS 42 41 40 39 38 37 36 34 33 Grid5 32 Grid6 31 Seg16/Grid7 30 Seg15/Grid8 29 Seg14/Grid9 Grid4 28 Seg13/Grid10 27 VEE 26 Seg12/Grid11 25 Seg11 24 Seg10 23 Seg9 VDD
SC16312
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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BLOCK DIAGRAM
Dimming circuit
SC16312
Command decoder
DIN 6 DOUT 5
15 Seg1
Serial I/F
CLK 8 STB 9
Display memeoy 16 bits x 11 words
16-bit output latch
16
11
segment driver
25 Seg11
5
VDD R 44
26 Seg12/Grid11
OSC
Timing generator key scan
Data selector
5
Multip lexed driver
31 Seg16/Grid7
key data memory (4 x 6)
Key1 to Key4 SW1 to SW4
11-bit shift register
11
5
27 Grid6
6
Grid driver
32 Grid6
4
4
4-bit latch
4-bit latch
42
39
14
7
27
LED1 LED4 Key data memory(4 x 6)
VDD VSS VEE (+5V) (0V) (-30V)
ABSOLUTE MAXIMUM RATING (Ta=25C, Vss=0V)
Characteristic
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 TOPT
Value
-0.5 ~ 7.0 VDD + 0.5 ~ VDD - 40 -0.5 ~ VDD + 0.5 VEE - 0.5 ~ VDD + 0.5 +25 -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 Ta=25C or higher
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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RECOMMENDED OPERATING RANGE (Ta=-20 ~ 70 C, Vss=0V)
Parameter
Logic Supply Voltage High-Level Input Voltage Low-Level Input Voltage Driver Supply Voltage
SC16312
Symbol
VDD VIH VIL VEE
Min
4.5 0.7x VDD 0 0
Typ
5 ----
Max
5.5 VDD 0.3xVDD VDD-35
Unit
V V V V
Maximum power consumption PMAX. = FIP driver dissipation + RL dissipation + LED driver dissipation + 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)
Example Where VEE = -25V, VDD = 5V, and in 16-segment and 6-digit modes, FIP driver dissipation = 16 x 6 +6/7 x 30 = 122 RL dissipation = 30 2 /50 x 17 = 306 LED driver dissipation = 4 x 20 = 80 Dynamic power consumption = 5 x 5 = 25 Total 553 Mw
ELECTRICAL CHARACTERISTICS (Ta=-20 ~ 70 C, VDD =4.5 ~ 5.5V, VEE=-30V)
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
Test conditions
LED1- LED4, IOH1=-1mA LED1- LED4, IOL1 =20mA DOUT, IOL2=4mA VO=VDD-2V, Seg1 to Seg11 VO=VDD-2V, Grid1 to Grid6 Seg12/Grid11 to Seg16/Grid7 VO= VDD -35V,driver off Driver output VI=VDD or VSS --CLK, DIN, STB Under no load, display off
Min
0.9VDD ---3 -15 -50 -0.7VDD ----
Typ
------100 ---0.35 --
Max
-1 0.4 ---10 150 1 -0.3VDD -5
Unit
V V V mA mA A k A V V V mA
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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SC16312
Symbol
tOSC tPLZ tPZL tTZH1 CLK
SWITCHING CHARACTERISTICS(Ta=-20 ~ 70 C, VDD =4.5 ~ 5.5V, VEE=-30V)
Parameter
Oscillation Frequency Propagation Delay Time
Test conditions
R=51 DOUT
Min
350 ----
Typ
500 ----
Max
650 300 100 2
Unit
kHz ns ns s s s MHz pF
CL=15pF, RL=10k Seg1 to Seg11 CL=300pF Grid1 to Grid6, Seg12/Grid11 to Seg16/Grid7
Rise Time tTZH2
--
--
0.5
Fall Time Maximum Clock Frequency Input Capacitance
tTHZ fmax. CI
CL=300pF, Segn, Gridn Duty=50% --
-1 --
----
120 -15
SWITCHING CHARACTERISTIC WAVEFORMS
fOSC
OSC
50% PWSTB
STB PWCLK CLK PWCLK
tCLK-STB
tSETUP
DIN
tHOLD
tPZL
DOUT
tPZL
tTHZ
Sn/Gn 90% 10%
tTHZ
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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TIMING CONDITIONS(Ta=-20 ~ 70 C, VDD =4.5 ~ 5.5V)
Parameter
Clock Pulse Width Strobe Pulse Width Data Setup Time Data Hold Time Clock-Strobe Time Wait Time
SC16312
Symbol
PWCLK PWSTB tSETUP tHOLD tCLK-STB tWAT
Test conditions
----CLK STB CLK CLK Note
Min
400 1 100 100 1 1
Typ
-------
Max
-------
Unit
ns s ns ns s s
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.
PAD DESCRIPTION
Pin No.
6
Symbol
DIN
Pin Name
Data input the low order bit.
Description
Input serial data at rising edge of shift clock, starting from
Output serial data at the falling edge of the shift clock, 5 DOUT Data output starting from low order bit. This is N-ch open-drain output pin. Initializes serial interface at the rising or falling edge of the SC16312. It then waits for reception of a command. 9 STB Strobe Data input after STB has 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 CLK Clock input Reads serial data at the rising edge, and outputs data at the falling edge. Connect resistor to this pin to determine the oscillation frequency to this pin. Segment output pins (Dual function as key source).
44
OSC Seg1/KS1 to Seg6/KS6 Seg7 to Seg11
Oscillator pin
15 ~ 20
High-voltage output High-voltage output (segment) High-voltage output (grid)
21 ~ 25
Segment output pins.
37 ~ 32
Grid1 to Grid6
Grid output pins. (to be continued)
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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(continued)
SC16312
Description
These pins are selectable for segment or grid driving. CMOS output. +20mA max. Data input to these pins is latched at the end of the display cycle. These pins constitute a 4-bit general-purpose input port. 5V10% Connect this pin to system GND. VDD-35V max.
Pin No.
26,28 ~ 31 42 ~ 39 10 ~ 13 1~4 14,38 7,43 27
Symbol
Seg12/Grid11 to Seg16/Grid7 LED1 to LED4 KEY1 to KEY4 SW1 to SW4 VDD VSS VEE
Pin Name
High-voltage output (segment/grid) LED output Key data input Switch input Logic power Logic ground Pull-down level
FUNCTIONAL DESCRIPTION
1. DISPLAY RAM ADDRESS AND DISPLAY MODE The display RAM stores the data transmitted from an external device to the SC16312 through the serial interface, and is assigned addresses as follows, in 8 bits unit:
Seg1 00HL 02HL 04HL 06HL 08HL 0AHL 0CHL 0EHL 10HL 12HL 14HL
Seg4 00HU 02HU 04HU 06HU 08HU 0AHU 0CHU 0EHU 10HU 12HU 14HU
Seg8
Seg12 01HL 03HL 05HL 07HL 09HL 0BHL 0DHL 0FHL 11HL 13HL 15HL 01HU 03HU 05HU 07HU 09HU 0BHU 0DHU 0FHU 11HU 13HU 15HU
Seg16 DIG1 DIG2 DIG3 DIG4 DIG5 DIG6 DIG7 DIG8 DIG9 DIG10 DIG11
b0 xxHL
b3 b4 xxHU
b7
Lower 4 bits
Higher 4 bits
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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2. KEY MATRIX AND KEY-INPUT DATA STORAGE RAM The key matrix is made up of a 6 x 4 matrix, as shown below.
SC16312
KEY1
KEY2
KEY3
KEY4
Seg1/KS1
Seg2/KS2
Seg3/KS3
Seg4/KS4
Seg5/KS5
The data of each key is stored as illustrated below, and is read with the read command, starting from the least significant bit.
KEY1 ... KEY4 Seg1/KS1 Seg3/KS3 Seg5/KS5 b0 --------- b3 3. LED PORT
KEY1 ... KEY4 Seg2/KS2 Seg4/KS4 Seg6/KS6 b4 --------- b7 Reading sequence
Data is written to the LED port with command, starting from the least port's least significant bit. When a bit of this port is 0, the corresponding LED lights; When the bit is 1, the LED turns off. The data of bits 5 through 8 are ignored.
MSB
b3 b2 b1
LSB
b0
Seg6/KS6
LED1 Don't care LED2 LED3 LED4
On power application, all LEDs are unlit.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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4. SW DATA
SC16312
SW data is read with the 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 b0
LSB
SW1 SW2 SW3 SW4
5. COMMANDS Commands set the display mode and status of the FIP driver. The first 1 byte input to the SC16312 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 SC16312 and select the number of segments and the number of grid(1/4 to 1/11 duty, 11 segments to 16 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
Display mode settings Irrelevant 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
On power application, the 11-digit, 11-segment mode is selected.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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(2) Data setting commands These commands set data write and data read modes.
MSB 0 1 b3 b2 b1 LSB b0
SC16312
Irrelevant
Data write and read mode settings 00: Write data to display memory 01: Write data to LED port 10: Read key data 11: Read SW data 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
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 b4 b3 b2 b1 LSB b0
Address (00H-15H)
If address 16H or higher is set, data is ignored, until a valid address is set. On the power application, the address is set to 00H.
(4) Display control commands
MSB 1 0 b3 b2 b1 LSB b0
Irrelevant
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)* 1: Display on
On power application, the 1/6 pulse width is set and the display is turned off. *Note: On power application, key scanning is stopped.
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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KEY SCANNING ANG DISPLAY TIMING
TDISP=500s SEG output DIG1 DIG2 DIG3 DIGn
SC16312
Key scan data 1 23456 DIG1
G1
G2
1/16 TDISP
G3
Gn
1 frame=TDISPx(n+1)
One cycle of key scanning consists of one frame, and data in a 6x4 matrix is stored in RAM.
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 1 b0 2 b1 3 b2 4 b3 5 b4 6 b5 7 b6 8 b7 1 b0 2 b1 3 b2 4 b3 5 b4 6 b5
tWAIT
Note
A dataread command is set.
Data is read.
Because the DOUT pin is an N-ch, open-drain output pin, be sure to connect an external pull-up resistor to this pin(1k to 10k)..
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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APPLICATION
Updating display memory by incrementing address
SC16312
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(22 bytes max.) Command4: controls display
Updating specific address
STB
CLK
DIN
Command 1
Command 2
Data
Command
Data
Command1: set data Command2: sets address Data: display data
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
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PACKAGE OUTLINE
SC16312
UNIT:mm
QFP-44-10x10-0.8
13.6+-0.4 10.0+-0.2 2.7
1.8+-0.2 33 34 23 22
10.0+-0.2 1.0 44 1 12 11
13.6+-0.4
0.8+-0.2 0.35+-0.10 0.8 0.15+-0.05
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0 2000.12.31
12

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