Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

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.

FEATURES

* Multiple display modes (11-segment & 11-dight

to 16-segment & 4-digit).

* Key scanning (6x4 matrix).

* Dimming circuit (eight steps).

* High-voltage output (V

35V max).

* LED ports (4 chs., 20 mA max).

* General-purpose input port (4 bits)

QPF-44-10x10-0.8

* No external resistors necessary for driver

outputs (P-ch open-drain + pull-down

resistor output)

* Serial interface (CLK, STB, D

, D

OUT

)

PAD CONFIGURATION

SC16312

OUT

CLK

STB

KEY

Seg

KEY

Seg

12/

Grid

Seg

13/

Grid

Seg

/Grid

Seg

/Grid

Seg

/Grid

Grid

Gri

LED

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

BLOCK DIAGRAM

Serial I/F

OSC

Display memeoy

16 bits x 11 words

Timing generator

key scan

key data memory (4 x 6)

Command decoder

Dimming

circuit

16-bit

output

latch

11-bit

shift

Data

selector

segm-

ent

driver

Multip

lexed

driver

Grid

driver

4-bit latch

4-bit

latch

LED

(+5V)

(0V)

(-30V)

Grid

Seg

Grid

Seg

Grid

Seg

OUT

CLK

STB

Key

to
Key

to
SW

Key data memory(4 x 6)

ABSOLUTE MAXIMUM RATING

(Ta=25

C, Vss=0V)

Characteristic

Symbol

Value

Unit

Logic Supply Voltage

-0.5 ~ 7.0

Driver Supply Voltage

DD +

0.5 ~ V

- 40

Logic Input Voltage

-0.5

+ 0.5

FIP Driver Output Voltage

- 0.5

+ 0.5

LED Driver Output Current

+25

FIP Driver Output Current

-40 (grid) ; -15 (segment)

Power Dissipation

800

Storage temperature

STG

-65 ~ +150

Operating Ambient Temperature

OPT

-40 ~ + 85

* Note: Derate at 6.4 mW/

C at Ta=25

C or higher

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

RECOMMENDED OPERATING RANGE

(Ta=-20 ~ 70

C, Vss=0V)

Parameter

Symbol

Min

Typ

Max

Unit

Logic Supply Voltage

4.5

5.5

High-Level Input Voltage

0.7x V

Low-Level Input Voltage

0.3xV

Driver Supply Voltage

-35

Maximum power consumption P

MAX.

= FIP driver dissipation + R

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)

dissipation = (V

-V

)

/50 x (number of segments + 1)(mW)

LED driver dissipation = number of LEDs x 20(mW)

Dynamic power consumption = V

x 5(mW)

Example

Where V

= -25V, V

= 5V, and in 16-segment and 6-digit modes,

FIP driver dissipation = 16 x 6 +6/7 x 30 = 122

dissipation = 30

/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, V

=4.5 ~ 5.5V, V

=-30V

)

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

High-Level Output Voltage

OH1

LED

- LED

OH1

-1mA

0.9V

Low -Level Output Voltage

OL1

LED

- LED

OL1

=20

Low -Level Output Voltage

OL2

OUT

OL2

=4mA

0.4

High-Level Output Current

OH21

-2V, Seg

to Seg

-3

High-Level Output Current

OH22

-2V, Grid

to Grid

Seg

/Grid

to Seg

/Grid

-15

Driver Leakage Current

OLEAK

= V

-35V,driver off

-10

Output Pull-Down Resistor

Driver output

100

150

Input Current

High-Level Input Voltage

0.7V

Low-Level Input Voltage

0.3V

Hysteresis voltage

CLK, D

, STB

0.35

Dynamic Current Consumption

DDdyn

Under no load, display off

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

SWITCHING CHARACTERISTICS

(Ta=-20 ~ 70

C, V

=4.5 ~ 5.5V, V

=-30V

)

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Oscillation Frequency

OSC

R=51

350

500

650

kHz

PLZ

300

Propagation Delay Time

PZL

CLK

OUT

=15pF, R

=10k

100

TZH1

Seg

to Seg

Rise Time

TZH2

=300pF

Grid

to Grid6,

Seg

/Grid

to Seg

/Grid

0.5

Fall Time

THZ

=300pF, Seg

, Grid

120

Maximum Clock Frequency

max.

Duty=50%

MHz

Input Capacitance

SWITCHING CHARACTERISTIC WAVEFORMS

OSC

STB

CLK

OUT

OSC

50%

90%

10%

THZ

PZL

SETUP

HOLD

CLK

CLK-STB

STB

CLK

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

TIMING CONDITIONS

(Ta=-20 ~ 70

C, V

=4.5 ~ 5.5V

)

Parameter

Symbol

Test conditions

Min

Typ

Max

Unit

Clock Pulse Width

CLK

400

Strobe Pulse Width

STB

Data Setup Time

SETUP

100

Data Hold Time

HOLD

100

Clock-Strobe Time

CLK-STB

CLK

STB

Wait Time

WAT

CLK

Note

Note: When data is read, a wait time t

WAIT

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.

Symbol

Pin Name

Description

Data input

Input serial data at rising edge of shift clock, starting from

the low order bit.

OUT

Data output

Output serial data at the falling edge of the shift clock,

starting from low order bit. This is N-ch open-drain output

pin.

STB

Strobe

Initializes serial interface at the rising or falling edge of

the SC16312. It then waits for reception of a command.

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.

CLK

Clock input

Reads serial data at the rising edge, and outputs data at

the falling edge.

OSC

Oscillator pin

Connect resistor to this pin to determine the oscillation

frequency to this pin.

15 ~ 20

Seg

/KS

to Seg

/KS

High-voltage output

Segment output pins (Dual function as key source).

21 ~ 25

Seg

to Seg

High-voltage output

(segment)

Segment output pins.

37 ~ 32

Grid

to Grid

High-voltage output

(grid)

Grid output pins.

(to be continued)

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

(continued)

Pin No.

Symbol

Pin Name

Description

26,28 ~ 31

Seg

/Grid

to Seg1

/Grid

High-voltage output

(segment/grid)

These pins are selectable for segment or grid driving.

42 ~ 39

LED

to LED

LED output

CMOS output. +20mA max.

10 ~ 13

KEY

to KEY

Key data input

Data input to these pins is latched at the end of the

display cycle.

1 ~ 4

to SW

Switch input

These pins constitute a 4-bit general-purpose input port.

14,38

Logic power

10%

7,43

Logic ground

Connect this pin to system GND.

Pull-down level

-35V max.

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:

Seg

00H

01H

DIG

02H

03H

DIG

04H

05H

DIG

06H

07H

DIG

08H

09H

DIG

0AH

0BH

DIG

0CH

0DH

DIG

0EH

0FH

DIG

10H

11H

DIG

12H

13H

DIG

14H

15H

DIG

xxH

Lower 4 bits

Higher 4 bits

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

2. KEY MATRIX AND KEY-INPUT DATA STORAGE RAM

The key matrix is made up of a 6 x 4 matrix, as shown below.

KEY

The data of each key is stored as illustrated below, and is read with the read command, starting from the least

significant bit.

KEY

1 ...

KEY

1 ...

KEY

Seg

/KS

Seg

/KS

Seg

/KS

Seg

/KS

Seg

/KS

Seg

/KS

--------- b

Reading sequence

3. LED PORT

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

LSB

LED1

LED3

LED2

LED4

Don't care

On power application, all LEDs are unlit.

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

4. SW DATA

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

LSB

SW1

SW3

SW2

SW4

5. COMMANDS

Commands set the display mode and status of the FIP driver.

The first 1 byte input to the SC16312 through the D

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

LSB

Irrelevant

Display mode settings

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.

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

(2) Data setting commands

These commands set data write and data read modes.

MSB

LSB

Irrelevant

Data write and read mode settings
00: Write data to display memory
01: Write data to LED port
10: Read key 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

11: Read SW data

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

LSB

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

LSB

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.

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

KEY SCANNING ANG DISPLAY TIMING

Key scan data

DIG1

DIGn

DIG2

DIG3

DIG1

SEG output

DISP

=500

1/16

DISP

1 frame=T

DISP

x(n+1)

1 2 3 4 5 6

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

CLK

STB

Transmission(data read)

A dataread command is set.

Data is read.

Note

WAIT

CLK

OUT

STB

Because the D

OUT

pin is an N-ch, open-drain output pin, be sure to connect an external pull-up resistor to this

pin(1k

to 10k

)..

Silan
Semiconductors

SC16312

HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD

Rev: 1.0

2000.12.31

APPLICATION

Updating display memory by incrementing address

Command 4

Data n

Data 1

Command 3

Command 2

Command 1

CLK

STB

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

Data

Command

Command 2

Command 1

CLK

STB

Command1: set data

Command2: sets address

Data: display data

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