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TB62709N/F

Intelligent, Constant Current, 7 segment LED numeric display
decoder/driver. For use with common anode configuration
numeric displays.

The TB62709N/F is an intelligent Constant Current LED display
driver designed specifically for seven segment LED display ap-
plications. The stand alone device includes all of the decode,
multiplex and driver circuitry necessary to control up to four seven
segment LED digits. All of the information required to program
up to four LED digits is input serially including a 16 step bright-
ness control. Expansion beyond four digits is possible with a
cascade connection to a second device. The device automati-
cally refreshes and maintains the displayed information.

Features

Constant Current segment drivers for consistent display
brightness.

Single device saves labor and board space.

Internal character set simplifies design efforts.

Automatically handles multiplex and display refresh tasks.

16 step programmable brightness control.

Single device controls up to four digits.

Available in thru hole and surface mount packages.

Data out cascade port for expansion beyond four digits.

Performance Characteristics

= 4.5V~5.5V

Digit enable: 17V / 400mA
Segment select: 17V / 0-40mA
Max transition frequency: 15Mhz

TB62709F

TB62709N

SDIP24-P-300-1.78 Weight: 1.62g (Typ.)

SSOP24-P-300-1.00 Weight: 0.32g (Typ.)

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TB62709N/F

Block Diagram:

Maximum Ratings:

CHARACTERISTICS

SYMBOL

RATING

UNIT

Supply Voltage

VDD

7.0

volts

LED Supply Voltage

VCC

volts

Source Output Current
Digit 0~3

IDIG

-400

Segment Drive Current
Segment a~DP

IOUT

Output Current

IOH/IOL

+/- 5

Input Voltage

VIN

-0.3 ~ VDD

~+0.3

volts

Clock Frequency

FCLK

MHz

Total Output Current

IVDD

400

Power Dissipation

TB62709N: 1.78

TB62709F: 0.62

Operation Temperature

Topr

-40 ~ +85

°C

Storage Temperature

Tstg

-55 ~+150

°C

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TB62709N/F

Recommended Operating Conditions:

CHARACTERISTICS

SYMBOL

TEST

CIRCUIT

CONDITION

MIN.

TYP.

MAX.

UNIT

Output Stage

Supply Current

ICC1

Set normal operation mode,
Rext=760

Out a~DP, all

ON VCC = 5V, Ta=25°C

300

ICC2

Set normal operation mode,
Rext=760

Out a~DP, all

ON VCC = 5V, Ta=25°C

320

Digit 0~3 Scanning Freq.

fOSC

Normal operation mode,
VDD=4.5 - 5.5V

240

480

960

Out a~DP Output Current

ISEG

Normal operation mode,
VDD=4.5 - 5.5V

Digit 0~3 Leakage Current

ILEAK1

All off mode, VCC=17V

-20

µA

Out a~DP Leakage Current

ILEAK2

All off mode, VCC=17V

µA

Digit 0~3 Output Voltage

VOUT

Normal operation mode
IDIG = 320mA

3.0

Logic

Supply Current

IDD1

Standby Mode, Ta=25°C

200

µA

IDD2

Blank Mode, Ta=25°C

12.5

Operating Supply Current

IDD3

Normal operating mode

fCLK=10MHz, Ta=25°C

Data-in:output a~DP on

20.5

High Level Input Current

IIH

Data-in, Load&Clock VIN=5V

µA

Low Level Output Current

IIL

Data-in, Load&Clock VIN=0V

-1

µA

High Level Output Voltage

VOH1

Data out, IOH=-1mA

4.6

VOH2

Data-out, IOH=-1µA

VDD

Low Level Output Voltage

VOL1

Data out, IOH=-1mA

0.4

VOL2

Data-out, IOH=-1µA

0.1

Clock Frequency

FCLK

CASCADE connected,

TA = -40 ~ 85ºC

MHz

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TB62709N/F

Switching Characteristics:

CHARACTERISTICS

SYMBOL

CONDITION

MIN.

TYP.

MAX.

UNIT

Data Hold Time (D-IN Clock)

tDHO

Data Set-up Time (D-IN Clock)

tDST

Propagation Delay (Clock D-OUT)

tPHL-SO

CL=10pf

tPLH-SO

CL=10pf

High Level Pulse Width Of Clock

tCLKH

Low Level Pulse Width Of Clock

tCLKL

Pulse Width Of Load

tw LD

100

Setup Time (Clock-Load)

tCLK-LD

Setup Time (Load-Clock)

tLD-CLK

Out a ~ DP Propagation Delay
(Load-Outn)

tpHL-SEG

CL=10pf

5.0

tpLH-SEG

CL=10pf

5.0

Out a ~ DP Rise Time (OUTn)

trSEG

CL=10pf

0.2

1.0

µs

Out a ~ DP Fall Time (OUTn)

tfSEG

CL=10pf

0.2

1.0

µs

Digit 0 ~ 3 Propagation Delay
(Load-DIGn)

tpHL-DIG

CL=10pf

10.0

µs

tpLH-DIG

CL=10pf

10.0

µs

Digit 0 ~ 3 Rise Time (DIGn)

trDIG

CL=10pf

0.4

2.0

µs

Digit 0 ~ 3 Fall Time (DIGn)

tfDIG

CL=10pf

0.4

2.0

µs

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TB62709N/F

Recommended Operating Conditions:

CHARACTERISTICS

SYMBOL

CONDITION

MIN.

TYP.

MAX.

UNIT

Output Stage

Supply Voltage

VCC

4.0

6.0

Digit 0~3 Output Current

IDIG

VOUT=3.0V

-320

Out a~DP Output Current

ISEG

VCE=0.7V

Logic

Supply Voltage

VDD

4.5

5.5

High Level Input Current

IIH

Data-In,
Load&Clock,VIN=VDD

µA

Low Level Input Current

IIL

Data-In, Load&Clock,VIN=0V

-1

µA

High Level Input Voltage

VIH

0.7

VDD

Low Level Input Voltage

VIL

0.3

VDD

Switching Condition

Data Hold Time (D-IN Clock)

tDHO

Data Setup Time (D-IN Clock)

tDST

Propagation Delay (Clock D-Out)

tPDSO

CL=10pf

High Level Pulse Width Of Clock

tCLKH

Low Level Pulse Width Of Clock

tCLKL

Pulse Width Of Load

twLD

150

Setup Time (Clock-Load)

tCKLD

100

Setup Time (Load-Clock)

tLDCLK

100

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Timing Diagram:

TB62709N/F

Terminal Description:

PIN No.

NAME

FUNCTION

Logic Supply Voltage

Serial Data IN (SI)

Serial Data Input To Shift Register

Clock (CK)

Clock Input Terminal

Load (LD)

Load Input Terminal

5-12

OUT a~DP

Output Terminal to Cathodes of Seven Segment Display

P-GND

Power Ground Terminal

Test In 2

Test Terminal - Grounded During Normal Operation

Test In 1

Test Terminal - Grounded During Normal Operation

6,17,19,2

Digit 0~3

Output Terminal to Anodes of Seven Segment Display

Supply Voltage For LEDs

P-GND

Power Ground Terminal

Rext

Constant Current Programming Terminal

Data Out (DO)

Cascade Connection To Next Display Stage

L-GND

Logic Ground Terminal

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TB62709N/F

Operation

Serial data is input on the DATA-IN terminal beginning with the most significant bit (MSB). Data
is clocked through the 16 bit shift register on the rising edge of the clock. A Low to High transi-
tion on the LOAD input following the 16

(LSB) bit latches the 16 bit word into the 16 bit D-type

latch.

Expansion beyond four digits is possible through the use of a cascade connection from the
DATA-OUT terminal. The data-out lags data-in by one bit through the data-out terminal.

Each 16 bit word typically includes 8 address bits and 8 data bits. The first four data bits,
beginning with D15 (MSB) ~ D12 select the Action mode (see figure 1). These global com-
mands determine the overall function the device is to perform and includes Blank, Normal
Operation, Load Register, All On and Stand-by. Data bits D11~D8 select the particular register to
be loaded (see figure 2) should the load register function be selected. Data bits D7~D0 (LSB)
define the specific commands required to program the display and define the brightness setting
(duty cycle).

Figure 1. Action Mode

"x" indicates that data is required in this field to execute the function. "-" indicates that data in
this field is not required and not recognized.

Data Input

Data is input on the SERIAL-IN terminal. Each 16 bit serial word includes an address (D15 ~ D8)
and data (D7 ~ D0). A low to high transition load command on the LOAD terminal loads the data
into the appropriate registers following the 16

clock pulse.

REGISTER DATA

INITIAL

STATE

FUNCTION

D15

D14

D13

D12

D11~D8

D7~D4

D3~D0

Hex Code

Blank
(OUTn & Digit 0~3 All Off)

0 - - - H

Normal Operation

1 - - - H

Load Register
(Duty, Decode, Digit & Data)

2 xxx H

All On (OUTn ALL On)

3 - - - H

Stand-By

4 - - - H

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TB62709N/F

Action Mode

1. Blank - Constant current segment drivers are off resulting in an all segments off condition.
Data D15 ~ D12 are 0. D11~D0 are not relevent in blank mode.

2. Normal (Operation) - Instructs device to display data loaded during previous steps. D11~ D0
are not relevent in the Normal Operation mode.

3. Load Register - Directs the device to recognize and load D11~ D0. In this mode D11 ~ D8
determines the specific register to be loaded (see figure 2) and D7 ~ D0 serves as the actual
data to be loaded for programming the brightness (duty cycle) or the particular digit.

4. All On - All constant current segment drivers are on resulting in an all segments illuminated
condition. D11 ~ D0 are not relevent in this mode.

5. Stand By - All display segments off condition. The Stand-By command turns off all internal
bias currents and serves as a low power consumption mode (<.2mA). Used with Stand-By set
up commands "All Data Clear" or "Data Not Cleared" (table 7).

The initial state, upon power up, is the BLANK state.

Application Note:
Stand-By and Blank perform similar functions in that the display is totally blank when either
command is input. Stand-By provides a low power consumption (<.2ma current draw on V

)

mode by turning off all internal bias currents in the internal driver circuits. The Stand-By com-
mand also cuts off the Rext bias current used to regulate the programmed constant current
within the device.

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TB62709N/F

LOAD REGISTER Mode

Figure 2. LOAD REGISTER Mode

"x" indicates that data is required in this field to execute the function. "-" indicates that data in
this field is not required and not recognized.

Selects the specific register to be loaded. The LOAD REGISTER mode is enabled by the Load
Register Action mode command (see Figure 1 - Action mode).

1. Duty Register - Enables the device to accept duty cycle (brightness) setting. Sixteen bright-
ness steps (0/16 to 15/16) are available.

2. Decode and Digit Register - Enables the device to accept data defining digit or digits to be
programmed.

3. Data Register 0~3 - Commands the device to enable a specific digit register to accept the
data to be displayed on the selected digit. Actual display data is set up by D7~D0.

REGISTER DATA

FUNCTION

D15~D12

D11

D10

D7~D4

D3~D0

Hex Code

Load Duty Register

20XXH

Load Decode & Digit Register

21XXH

Load Data Register 0

22XXH

Load Data Register 1

23XXH

Load Data Register 2

24XXH

Load Data Register 3

25XXH

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TB62709N/F

Data Decode

The TB62709F utilizes two basic modes of operation. In the DECODE MODE, data encoded in
data bits D7~D0 is decoded to display preset characters per table 8. This mode is activated as
illustrated in table 5. With D15~D8 programmed as 21 Hex and D7~D4 as 1 Hex the DECODE
MODE is selected.

In the DIRECT DRIVE MODE the ability to decode data to preset characters for display is
bypassed giving the programmer direct control of the 8 constant current sink outputs. This mode
may be used to drive discrete LEDs or to display characters not included in the character set.

"x" indicates that data is required in this field to execute the function. "-" indicates that data in
this field is not required and not recognized.

This programming step is performed simultaneously with the DIGIT SELECTION decision (table
4) which utilizes D3~D0.The initial state, upon power up, is the DECODE mode.

Table below illustrates the input / output relationship in the DIRECT DRIVE mode. A Logic 1
data state turns the respective output on and a Logic 0 data state turns the respective output off.

REGISTER DATA

INITIAL

STATE

FUNCTION

D15~D8

D3~D0

Hex Code

Direct Drive

21H

210XH

Decode

21H

211XH

REGISTER DATA

OUTPUT

INITIAL STATE

NOTE

Out-a

H Data is

output ON (1)

and

L Data is

output OFF (0)

Out-b

Out-c

Out-d

Out-e

Out-f

Out-g

Out-DP

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TB62709N/F

Brightness Control

Brightness is controlled by controlling the "on time" duty cycle. The device allows for 16 bright-
ness steps as illustrated in list 3 with 0/16 as the dimmest setting (not illuminated) to 15/16 as
the brightest setting. The duty cycle control register is addressed with a 20 Hex command at
D15~D8 and the appropriate data per list 3 at D3~D0. D7~D4 are not recognized by the duty
cycle register. The initial state, upon power up is 15/16, or full brightness.

"x" indicates that data is required in this field to execute the function. "-" indicates that data in
this field is not required and not recognized.

REGISTER DATA

INITIAL

STATE

Duty Cycle

D15~D8

D7~D4

Hex Code

0/16

20H

20X0H

1/16

20H

20X1H

2/16

20H

20X2H

3/16

20H

20X3H

4/16

20H

20X4H

5/16

20H

20X5H

6/16

20H

20X6H

7/16

20H

20X7H

8/16

20H

20X8H

9/16

20H

20X9H

10/16

20H

20XAH

11/16

20H

20XBH

12/16

20H

20XCH

13/16

20H

20XDH

14/16

20H

20XEH

15/16

20H

20XFH

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TB62709N/F

Digit Selection

The digit(s) to be programmed are selected as illustrated table below. This function is enabled
with a 21 Hex command at D15~D8 and the appropriate data sequence to select Digit 0 only,
Digit 0 and 1, Digit 0 -2 or digit 0-3 as illustrated in table 4. This programming step is performed
simultaneously with the DECODE / DIRECT DRIVE decision (table 5) which utilizes D7~D4. The
initial state, upon power up, is Digits 0-3 activated.

STAND-BY Commands

Two STAND-BY commands are available as illustrated in table below. STAND-BY / NO DATA
CLEAR places the device in a power save mode while leaving data intact in the various regis-
ters. This mode is enabled by a 4 Hex command at D15~D12 and 0 Hex at D3~D0. D11~D4 are
not relevent in the STAND-BY / NO DATA CLEAR Mode.

STAND-BY / DATA CLEAR also places the device in a power save mode and clears data in the
various registers leaving registers in their initial state. This mode is enabled by a 4 Hex com-
mand at D15~D12 and 1 Hex at D3~D0. D11~D4 are not relevent in the STAND-BY / DATA
CLEAR Mode.

"x" indicates that data is required in this field to execute the function. "-" indicates that data in
this field is not required and not recognized.

REGISTER DATA

INITIAL

STATE

D15~D8

D7~D4

D1 D0

Hex Code

Activate Digit 0 Only

21H

21X0H

Activate Digit 0~1

21H

21X1H

Activate Digit 0~2

21H

21X2H

Activate Digit 0~3

21H

21X3H

REGISTER DATA

D15~D8

D7~D4

Hex Code

Stand-By (No Data Clear)

4-H

4XX0H

Stand-By (Data Clear)

4-H

4XX1H

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TB62709N/F

CHARACTER DECODE Mode

Table 8 illustrates the data versus character displayed relationship. This mode is enabled along
with the LOAD REGISTER Mode (See LOAD REGISTER Mode section - Figure 2). A 2 Hex
command at D15~D12 selects the LOAD REGISTER Mode. The specific register to be ad-
dressed is selected by D11~D8. The digits are designated D0, D1, D2 and D3 and are ad-
dressed per their respective registers as illustrated in Figure 2. D3~D0 provides the code for the
seven segment display. D5 and D4 select one of two character sets and D6 controls the decimal
point for each digit.

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Operation examples.

Example 1

Example 1 sets up the character a at Digit 0, b at Digit 1, c at Digit 2 and d at Digit 3. The
characters are initially set at full brightness (15/16 duty cycle) and displayed. The duty cycle is
then changed to half brightness (8/16 duty cycle) as the display is first blanked and then acti-
vated with the same a,b,c and d characters. The display is then flashed on and off by alternating
the BLANK and NORMAL commands before going to the STAND-BY Mode.

TB62709N/F

STEP

D15~D12

D11~D8

D7~D4

D3~D0

DIGIT 0~3

SEGMENT

a,b,c,d,e,f,g

SEG

MODE

DISPLAY

INDICATION

Off

Initial State (Clear

Mode)

All Blank

0010

0000

XXXX

1111

Off

Duty=15/16

All Blank

0010

0001

0011

Off

Decode 4 Dig.

All Blank

0010

X000

1010

Off

Dig 0=a

All Blank

0010

0011

X000

1011

Off

Dig 1=b

All Blank

0010

0100

X000

1100

Off

Dig 2=c

All Blank

0010

0101

X000

1101

Off

Dig 3=d

All Blank

0001

XXXX

Off

Normal

a-b-c-d

0010

0000

XXXX

1000

Off

Duty=8/16

a-b-c-d

0000

XXXX

Off

Blank

All Blank

0001

XXXX

Off

Normal

a-b-c-d

0000

XXXX

Off

Blank

All Blank

0001

XXXX

Off

Normal

a-b-c-d

0000

XXXX

Off

Blank

All Blank

0001

XXXX

Off

Normal

a-b-c-d

0100

XXXX

0000

Off

Stand-By

(Shut Down)

All Blank

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Operation examples.

Example 2

Example 2 sets up the character a with the decimal point on at Digit 0 at full brightness (15/16
duty cycle) with the remaining digits (1~3) left blank. The display then changes to a character b
with the decimal point on displayed at Digit 1 with Digits 0, 2 and 3 blank. Character c (decimal
point on) is then displayed at Digit 2 with Digits 0, 1 and 3 left blank and the sequence ends with
the character d (decimal point on) displayed on Digit 3 with Digits 0~2 left blank followed by the
STAND-BY Mode.

TB62709N/F

STEP

D15~D12

D11~D8

D7~D4

D3~D0

DIGIT 0~3

SEGMENT

a,b,c,d,e,f,g

SEG

MODE

DISPLAY

INDICATION

Off

Initial State (Clear

Mode)

All Blank

0010

0000

XXXX

1111

Off

Duty=15/16

All Blank

0010

0001

0011

Off

Decode 4 Dig.

All Blank

0010

X100

1010

Off

Dig 0=a

All Blank

0010

0011

X001

0000

Off

Dig 1=Blank

All Blank

0010

0100

X001

0000

Off

Dig 2=Blank

All Blank

0010

0101

X001

0000

Off

Dig 3=Blank

All Blank

0001

XXXX

Off

Normal

a - - -

0010

X001

0000

Off

Dig 0=Blank

All Blank

0010

0011

X100

1011

Off

Dig 1=b

- b - -

0010

0011

X001

0000

Off

Dig 1=Blank

All Blank

0010

0100

X100

1100

Off

Dig 2=c

- - c -

0010

0100

X001

0000

Off

Dig 2=Blank

All Blank

0010

0101

X100

1101

Off

Dig 3=d

- - - d

0100

XXXX

0000

Off

Stand-By

(Shut Down)

All Blank

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TB62709N/F

Cascade Operation:

TB62709

a~Dp

DIG 0-3

Vcc

t
a
I

TB62709

a~Dp

Vcc

t
a
I

Data Out

TB62709

a~Dp

DIG 8-11

Vcc

t
a
I

Data Out

DIG 4-7

In order to update the display information within a specific driver
perform the following actions as appropriate.

Case 1. Digit 03:
Input 16 bit data serially, Pulse Load Line High Once

Case 2. Digit 4-7:
Input 32 bits of data that corresponds to the information to be displayed on Digits 0-3 + Digits 4-7 (most significant)
then Pulse Load Line High Once

Case 3. Digit 8-11:
Input 48 bits of data that corresponds to the information to be displayed on Digits 0-3 + Digits 4-7 + Digits 8-11 (most
significant) then Pulse Load Line High Once

Ð­Ð»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: TB62709N

ÐÐ»ÐµÐºÑ‚Ñ€Ð¾Ð½Ð½Ñ‹Ð¹ ÐºÐ¾Ð¼Ð¿Ð¾Ð½ÐµÐ½Ñ‚: TB62709N