TOPRO TP6312 User Manual

TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

General Description

The TP6312 is a VFD (Vacuum Fluorescent Display) controller/driver that is driven on a 1/4 to 1/11-duty factor. It consists of 11 segment output lines, 6 grid output lines, 5 segment/grid output drivelines, a display memory, a control circuit, and a Key scan circuit. Serial data is input to TP6312 through a three-line serial interface. This VFD controller/driver is ideal as a peripheral device of a single-chip microcomputer.

Ordering Information

TP 6312

Footprint Version Package Type

Features

 Multiple display modes (11-segment & 11-digit to

16-segment & 4-digit)

 Key scanning (6 × 4 matrices)  Dimming circuit (eight steps)  High-voltage output (V  LED ports (4 chs, 20 mA max)  General-purpose input port (4 bits)  No external resistor necessary for driver outputs

(P-ch open-drain + pull-down resistor output)

 Serial interface (CLK, STB, D

Package Type

Footprint

F: LQFP S: 2.0 mm L: 3.2 mm

– 35V max)

DD

IN

, D

OUT

)

Block Diagram

DIN

DOUT

CLK

STB

R

Key1

to

Key4

4

Serial I/F

OSC

Command decoder

Display memory 16bit x 11 word

Timing generator key

scan

Key data memory

(4x6)

Dimming circuit

16 11

16-bit output latch16-bit output latch

11 6

Seg1

Segment driverSegment/grid driverGrid driver

5

Data selector

5

Seg11

Seg12/Gird11

Seg16/Gird7

Grid1

Grid6

SW1

to

SW4

4

4 bit latch

1

LED

VDD VSS VEE

(+5V) (0V) (-30V)

4

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TP6312

Pin Configuration (Top View)

Grid 4

Grid 3

Grid 2

Grid 1

DD

V

LED 4

LED 3

LED 2

LED 1

VSS

OSC

44 43 42 41 40 39 38 37 36 35 34

Use all the power pins.

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

EE

Grid 6

Grid 5

33

1

SW 1

Seg15 / Grid 8

Seg16 / Grid 7

30

31

32

2

3

4

SW 2

SW 3

SW 4

V

Seg14 / Grid 9

Seg13 / Grid 10

Seg12 / Grid 11

26

27

28

29

5

6

7

8

OUT

DIN

CLK

VSS

D

Seg9

Seg10

Seg11

23

24

25

Seg8

Seg7

Seg6 / KS6

Seg5 / KS5

Seg4 / KS4

Seg3 / KS3

Seg2 / KS2

Seg1 / KS1

V

DD

KEY 4

KEY 3

12 13 14 15 16 17 18 19 20 21 22

9

10

11

STB

KEY 1

KEY 2

Pin Description

Pin No Symbol Pin Name Description

6 DIN Date input

5 D

Date output

OUT

9 STB Strobe

8 CLK Clock input

44 OSC Oscillator pin

/KS1 to

Seg

1

Seg

6

/Grid11 to

11

16

/KS6

/Grid7

High-voltage output High-voltage output

(Segment)

High-voltage output

(Grid)

High-voltage output

(Segment/grid)

15 to 20 21 to 25 Seg7 to Seg11 37 to 32 Grid1 to Grid6

26, 28 to 31

42 to 39 LED1 to LED4 LED output CMOS output. +20 mA max. 10 to 13 Key1 to Key4 Key data input

1 to 4 SW1 to SW4 Switch input

14, 38 VDD Logic power

7, 43 VSS Logic ground Connect this pin to system GND.

27 VEE Pull-down level VDD – 35 V max

Inputs serial data at rising edge of shift clock, starting from the lower bit. Outputs serial data at falling edge of shift clock, starting from the lower bit. This is N-ch open-drain output pin. Initializes the serial interface at rising or falling edge to make TP6312 waiting for reception of command. Data input after STB has fallen is processed as command. While command data is processed, current processing is stopped and serial interface is initialized. While STB is high, CLK is ignored. Reads serial data at rising edge, and outputs data at falling edge. Connects a resistor to this pin to determine the oscillation frequency to this pin. Segment output pins (Dual function as Key source).

Segment output pins. Grid output pins. These pins are selectable for segment or grid

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

display cycle. These pins constitute 4-bit general-purpose input port. 5V ± 10%

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

Functional Description

Display RAM Address and Display Mode

The display RAM stores the data transmitted from an external device to TP6312 through the serial interface, and is assigned addresses as follows, in units of 8 bits:

Seg

Seg4 Seg8 Seg

1

00HU 01HL 01HU DIG1

00H

L

02HL 02HU 03HL 03HU DIG2 04HL 04HU 05HL 05HU DIG3 06HL 06HU 07HL 07HU DIG4

08HL 08HU 09HL 09HU DIG5 0AHL 0AHU 0BHL 0BHU DIG6 0CHL 0CHU 0DHL 0DHU DIG7 0EHL 0EHU 0FHL 0FHU DIG8 10HL 10HU 11HL 11HU DIG9 12HL 12HU 13HL 13HU DIG10 14HL 14HU 15HL 15HU DIG11

b

0

b

3 b4

7

XX HL XX HU

Lower 4 bits Higher 4 bits.

12

Seg16

Key Matrix and Key-Input Data Storage RAM

The Key matrix is of 6 × 4 configuration, as shown below.

KEY1

KEY2

The data of each Key is stored as illustrated below, and is read by a read command, starting from the least significant bit.

Key

Key4Key1 Key4

1

/ KS1 Seg2 / KS2

Seg

1

Seg3 / KS3 Seg4 / KS4

Reading s eque nce

Seg5 / KS5 Seg6 / KS6

b0 b3 b4 b7

LED Port

Data is written to the LED port by a write command, starting from the least significant bit of the port. When a bit of this port is 0, the corresponding LED lights; when the bit is 1, the LED goes off. The data of bits 5 through 8 is ignored.

---- ---- ---- ---- b3 b2 b1 b0

LED1

Don't care

LED2 LED3 LED4

On power application, all LEDs are unlit.

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 LSB

0 0 0 0 b3 b2 b1 b0

KEY3

KEY4

SW1 SW2 SW3 SW4

Commands

Seg1/KS1

Seg2/KS2

Seg3/KS3

Seg4/KS4

Seg5/KS5

Seg6/KS6

A command sets the display mode and status of the VFD driver. The first 1 byte input to TP6312 through the D

IN

pin after the STB pin has fallen is regarded as a command. If STB is high while a command/data is transmitted, serial communication is initialized, and the transmitting command/data is invalid; however, the

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

command/data already transmitted remains valid.

(1) Display mode setting command

This command initializes TP6312 and selects the number of segments and number of grids (1/4 to 1/11duty, 11 segments to 16 segments). On power application, the 11-digit, 11-segment mode is selected.

MSB LSB

0 0 ---- ---- ---- b2 b1 b0

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

(2) Data setting commands

This command sets data write and read modes.

MSB LSB

0 1 ---- ---- b3 b2 b1 b0

Irrelevant

Data write and read mode settings 00:Writes data to display memory

01:Writes data to LED port 10:Reads key data. 11:Reads SW data.

Address increment mode (display memory). 0:Increments address after data has been written. 1:Fixes address.

Test mode settings. 0:Normal operation. 1:Test mode.

If address 16H or higher is set, the data is ignored and unit a correct address is set. On power application, the address is set to 00H.

(4) Display control command

MSB LSB

1 0 ---- ---- b3 b2 b1 b0

Irrelevant

Dimming quantity settings. 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 continues) 1:Display on.

On power application, the 14/16-pulse width is set and the display is turned off.

Key Scanning and Display Timing

TDISP 500 ≒ µs

DIG1 DIG2 DIG3 .............. DIGn 1 2 ... 6SEG Output DIG1

G1

1/16

G2

G3

Gn

TDISP

1 frame=TDISP x (n+1)

Key scan data

On power application, the normal operation mode and address increment mode set.

(3) Address setting command

This command sets an address of the display memory.

MSB LSB

1 1 ---- b4 b3 b2 b1 b0

One cycle of Key scanning consists of two frames, and data of 6 × 4 matrices is stored in RAM.

Serial Communication Format

Reception (command/data write)

STB

DIN

CLK

b0 b1 b2 …… b6 b7

If d a ta i s cintiguous

……

Address (00H-15H)

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TP6312

Transmission (data read)

STB

DIN

CLK

DOUT

b0 b1 b2 b3 b5b4 b6 b7

1 2345678 1 23456

Data r ea di ng comma nd i s s e t. Data reading starts.

t

WAIT

b0 b1 b2 b3 b5b4

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

Because the D pin, be sure to connect an external pull-up resistor to this pin (1kΩ to 10 kΩ).

*: When data is read, a wait time (t necessary from the rising of the eighth clock that has set the command till the falling of the first clock that has read the data.

pin is an N-ch open-drain output

OUT

Absolute Maximum Ratings (Ta = 25°C, Vss = 0V)

Parameter Symbol Ratings Unit

Logic Supply Voltage VDD -0.5 to + 7.0 V

Driver Supply Voltage VEE VDD +0.5 to VDD -40 V

Logic Input Voltage Vi1 -0.5 to VDD +0.5 V VFD Driver Output Voltage Vo2 VEE –0.5 to VDD +0.5 V LED Driver Output Current Io1 +25 mA

VFD Driver Output Current Io2

Power Dissipation PD 800* mW

Operating Ambient Temperature T

Storage Temperature T

-40 to +70

opt

-65 to +150

stg

* Derate at –6.4 mW/℃ at Ta = 25℃ or higher.

Recommended Operating Conditions (Ta = -20°C to +70°C, Vss = 0V)

Parameter Symbol Min. Typ. Max. Unit Test Condition

Logic Supply Voltage VDD 4.5 5 5.5 V

High-Level input Voltage VIH 0.7VDD V

Low-Level input Voltage VIL 0 0.3V

Driver Supply Voltage VEE 0 VDD-35 V

Maximum power consumption P

= VFD driver dissipation + RL dissipation + LED driver dissipation + dynamic power

MAX

consumption. Where segment current = 3 mA, grid current = 15mA, and LED current = 20 mA, VFD driver dissipation = number of segments x 6 + number of grids/(number of grids + 1) x 30(mW) R

dissipation ≒ (VDD-VEE)2/50 x (segment+1) (mW)

L

LED driver dissipation = number of LEDs x 20(mW) Dynamic power consumption = V

x 5(mW)

DD

Electrical Characteristics (Ta = -20°C to +70°C, V

Parameter Symbol Min Typ. Max. Unit Test Conditions

High-Level Output Voltage V

Low-Level Output Voltage V Low-Level Output Voltage V

High-Level Output Current I High-Level Output Current I

Driver Leakage Current I

Output Pull-Down Resistor RL 50 100 150

Input Current Ii High-Level Input Voltage VIH 0.6 V Low-Level Input Voltage VIL 0.3 V

Hysteresis Voltage VH 0.35 V CLK, DIN, STB

Dynamic Current Consumption I

0.9 V

OH1 OL1 OL2

-3

OH21

-15

OH22

-10

OLEAK

5 mA Under no load, display off

DDdyn

-40 (grid)

-15 (segment)

DD

V LED1 – LED4, I

DD

V

mA

℃ ℃

V

= 4.5V to 5.5V, VS = 0V, V

1 V LED1 – LED4, I

0.4 V D mA VO = VDD –2V, Seg1 to Seg11

mA

µA kΩ

±1 µA

DD

V

OUT

= VDD –2V,Grid1 to Grid6,

V

O

Seg

/Seg 11 to Seg16/Seg 7

12

VO = VDD - 35V, Drive off

VI = VDD or VSS

WAIT)

= V

EE

OH1

= 20 mA

OL1

, I

= 4 mA

OL2

Drive output

of 1µs is

- 35V)

DD

= -1 mA

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

Switching Characteristics (Ta = -20°C to +70°C, VDD = 4.5V to 5.5V, VEE = -30V)

Parameter Symbol Min Typ. Max. Unit Test Conditions

Oscillation Frequency f

Propagation Delay Time

Rise Time

350 500 650 kHz

OSC

t

300 ns

PLZ

t

100 ns

PZL

t

2

TZH1

0.5

t

TZH2

µs

R = 56kΩ

CLK ⇒ DOUT

CL = 15pF,RL = 10kΩ

Seg1 to Seg11

CL = 300

Grid1 to Grid6

PF

Seg12/Grid11

Seg16/Grid7

Fall Time t

Maximum Clock Frequency f

120

THZ

1 MHz Duty = 50%

max

µs

CL = 300 pF, Segn, Gridn

Input Capacitance C1 15 pF

Timing Conditions (Ta = -20°C to +70°C, Vdd = 4.5V to 5.5V)

Parameter Symbol Min Typ. Max. Unit Test Conditions

Clock Pulse Width PWCLK 400 ns

Strobe Pulse Width PW STB 1

Data Setup Time t

Data Hold Time t

Clock-Strobe Time t

Wait Time t

100 ns

SETUP

100 ns

HOLD

1

CLK-STB

1

WAIT

µs

µs µs

CLK ↑→ STB ↑ CLK ↑→ CLK ↓

to

Switching Characteristic Waveform

PW

CLK

PW

t

SETUP

t

hold

CLK

PW

STB

t

CLK-STB

t

PZL

t

PZL

t

THZ

90%

10%

t

THZ

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

Application

Updating display memory by incrementing address

STB

CLK

DIN

Command1

Command2

Command3

Data 1

Command1: sets display mode Command2: sets data Command3: sets address Data 1 to n: transfers display data (22 bytes max.) Command4: controls display

……

Data n

Comma n d 4

Updating specific address

STB

CLK

DIN

Command1: sets data Command2: sets address Data: display data

Command1

Command2

Data

Command2

Data

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

Package Information

44-Pin Plastic LQFP Short-Lead (Footprint = 2.0mm)

A

B

NOTE

Each lead centerline is located within 0.16 mm of its true position (T.P.) at maximum material

33

34 44

111

E

F

23

22

12

D

C

H

J

I

(Unit: mm)

G

K

Item Millimeters

A 12.0 ± 0.2 B 10.0 ± 0.2 C 12.0 ± 0.2 D 10.0 ± 0.2 E 0.37(TYP.) F 0.8 BSC

o

+0.2

-0.1

+7 o

-3 o

G 0.3

H 1.0

I 0.6 ± 0.15

J 12o ± 1o

K 12o ± 1o

L 1.7 MAX

M 1.4± 0.1

N 0 o MIN

O +3

N

M

L

O

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TP6312

1/4 TO 1/11-DUTY VFD CONTROLLER/DRIVER

44-Pin Plastic LQFP Long- Lead (Footprint = 3.2mm)

A

B

NOTE

Each lead centerline is located within 0.16 mm of its true position (T.P.) at maximum material

33

34 44

111

E

F

23

22

12

D

C

H

J

I

G

K

(Unit: mm)

Item Millimeters

A 13.2 ± 0.2 B 10.0 ± 0.2 C 13.2 ± 0.2 D 10.0 ± 0.2 E 0.37(TYP.) F 0.8 BSC

+0.2 G 0.3

-0.1

H 1.6

I 1.2 ± 0.15

J 12o ± 1o

K 12o ± 1o

L 1.7 MAX

M 1.4± 0.1

N 0 o MIN

O +3 o

+7 o

-3

o

N

M

L

O

◎Headquarters 5 F, No. 10, Prosperity Road 1, Science-Based Industrial Park, Hsinchu 300, Taiwan, R.O.C

Tel.: 886-3-563-2515 Fax: 886-3-564-1728

◎Taipei Office

5 F, No.27, Min Chuan W. Rd. Taipei 104, Taiwan, R.O.C Tel.: 886-2-2585-6858 Fax: 886-2-2594-1104 ◎Shenzhen Office

Room 802, Tower A, World Trade Plaza, Fahong Rd., Fatian, Shenzhen, China Tel.: 86-755-8367-9985 Fax: 86-755-8367-9518

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