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 applications. 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 brightness control. Expansion beyond four digits is possible with a
cascade connection to a second device. The device automatically 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.
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Terminal Description:
PIN No.NAMEFUNCTION
1V
2Serial Data IN (SI) Serial Data Input To Shift Register
3Clock (CK)Clock Input Terminal
4Load (LD)Load Input Terminal
5-12OUT a~DPOutput Terminal to Cathodes of Seven Segment Display
13P-GNDPower Ground Terminal
14Test In 2Test Terminal - Grounded During Normal Operation
15Test In 1Test Terminal - Grounded During Normal Operation
6,17,19,2Digit 0~3Output Terminal to Anodes of Seven Segment Display
18V
21P-GNDPower Ground Terminal
22RextConstant Current Progra mming Terminal
23Data Out (DO)Cascade Connection To Next Display Stage
24L-GNDLogi c Ground Terminal
Timing Diagram:
DD
CC
Logic Supply Voltage
Supply Voltage For LEDs
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589
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
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 16th clock pulse.
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 transition on the LOAD input following the 16th (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 commands 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
FUNCTION
Blank
(OUTn & Dig it 0~3 All Off)
Normal Operation0001———1 - - - H
Load Register
(Duty, Decode, Digit & Data)
All On (OUTn ALL On)0011———3 - - - H
Stand-By0100———4 - - - H
REGISTER DATA
D15D14 D13 D12 D11~D8 D7~D4 D3~D0 Hex Code
0000———0 - - - H⇐
0010XXX2 xxx H
INITIAL
STATE
“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.
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/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 VDD)
mode by turning off all internal bias currents in the internal driver circuits. The Stand-By command also cuts off the Rext bias current used to regulate the programmed constant current
within the device.
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591
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
LOAD REGISTER Mode
Figure 2. LOAD REGISTER Mode
REGISTER DATA
FUNCTION
Load Duty Register2H0000XX20XXH
Load Decode & Digit Register2H0001XX21XXH
Load Data Register 02H0010XX22XXH
Load Data Register 12H0011XX23XXH
Load Data Register 22H0100XX24XXH
Load Data Register 32H0101XX25XXH
“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).
D15~D12 D11 D10 D9 D8 D7~D4 D3~D0 Hex Code
1. Duty Register - Enables the device to accept duty cycle (brightness) setting. Sixteen brightness 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.
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/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.
REGISTER DATA
FUNCTION
Direct Drive21H0000X210XH
Decode21H0001X211XH
D15~D8 D7 D6 D5 D4 D3~D0Hex Code
INITIAL
STATE
⇐
“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 DATAOUTP UTIN ITIAL STATENOTE
D0Out-aL
D1Out-bL
D2Out-cL
D3Out-dL
D4Out-eL
D5Out-fL
D6Out-gL
D7Out-DPL
H Dat a is
output ON (1)
and
L Data is
output OFF (0)
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593
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Brightness Control
Brightness is controlled by controlling the “on time” duty cycle. The device allows for 16 brightness 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.
REGISTER DATA
Duty Cycle
0/1620H—000020X0H
1/1620H—000120X1H
2/1620H—001020X2H
3/1620H—001120X3H
4/1620H—010020X4H
5/1620H—010120X5H
6/1620H—011020X6H
7/1620H—011120X7H
8/1620H—100020X8H
9/1620H—100120X9H
10/1620H—101020XAH
11/1620H—101120XBH
12/1620H—110020XCH
13/1620H—110120XDH
14/1620H—111020XEH
15/1620H—111120XFH
D15~D8D7~D4D3 D2 D 1 D0Hex Code
INIT IAL
STATE
⇐
“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.
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/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.
REGISTER DATA
D15~D8D7~D4D3D2 D1 D0Hex Code
Activate Digit 0 Only21HX000021X0H
Activate Digit 0~121HX000121X1H
Activate Digit 0~221HX001021X 2H
Activate Digit 0~321HX001121X 3H
INITIAL
STATE
⇐
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 registers. 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 command at D15~D12 and 1 Hex at D3~D0. D11~D4 are not relevent in the STAND-BY / DATA
CLEAR Mode.
REGISTER DATA
D15~D8D7~D4D3D2D1D0Hex Code
Stand-By (No Data Clear)4-H—00004XX0H
Stand-By (Data Clear)4-H—00014XX1H
“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.
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595
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/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 addressed is selected by D11~D8. The digits are designated D0, D1, D2 and D3 and are addressed 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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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
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 activated 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.
STEP D15~D12D11~D8D7~D4D3~D0DIGIT 0~3
0————Off OffOff
100100000XXXX1111OffOffOffDuty=15/16All Blank
20010000100010011OffOffOffDecode 4 Dig.All Blank
300100010X0001010OffOffOffDig 0=aAll Blank
400100011X0001011OffOffOffDi g 1=bAll Blank
500100100X0001100OffOffOffDi g 2=cAll Blank
600100101X0001101OffOffOffDig 3=dAll Blank
70001XXXXXXXXXXXXOnOnOffNormala-b-c-d
800100000XXX X1000OnOnOffDuty=8/16a-b-c-d
90000XXXXXXXXXXXXOffOffOffBlankAll Blank
100001XXXXXXXXXX XXOnOnOffNormala-b-c-d
110000XXXXXXXXXXXXOffOffOffBlankAll Blank
120001XXXXXXXXXX XXOnOnOffNormala-b-c-d
130000XXXXXXXXXXX XOffOffOffBlankAll Blank
140001XXXXXXXXXX XXOnOnOffNormala-b-c-d
1501 00XXXXX XXX0000OffOffOff
SEGMENT
a,b,c,d,e,f,g
SEG
DP
MODE
Initial State (Clear
Mode)
Stand-By
(Shut Down)
DISPLAY
INDICATION
All Blank
All Blank
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
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.
STEP D15~D12D11~D8D7~D4D3~D0DIGIT 0~3
0————OffOffOff
100 100000XX XX1111OffOffOffDuty=15/16All Bla nk
20010000100010011OffOffOffDecode 4 Dig.All Blank
300100010X1001010OffOffOffDig 0=aAll Blank
400100011X0010000OffOffOffDig 1=BlankAll Blank
500100100X0010000OffOffOffDig 2=BlankAll Blank
600100101X0010000OffOffOffDig 3=BlankAll Blank
70001XXXXXXXXXXXXOnOnOffNormala - - -
800100010X0010000OffOnOffDig 0=BlankAll Blank
900100011X1001011OnOnOffDig 1=b- b - -
1000100011X0010000OffOnOffD ig 1=BlankAll Blank
1100100100X1 001100OnOnOffDig 2=c- - c -
1200100100X0 010000OffOnOffD ig 2=BlankAll Blank
13001001 01X1001101OnOnOffD ig 3=d- - - d
14010 0XX XXXX XX00 00OffOffOff
SEGMENT
a,b,c,d,e,f,g
SEG
DP
MODE
Initial State (Clear
Mode)
Stand-By
(Shut Down)
DISPLAY
IND ICATION
All Bla nk
All Bla nk
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
State Movement Diagram
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599
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Test Circuit
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Test Circuit
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601
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Test Circuit
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Duty Cycle Control vs. Output Current Value:
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603
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
External Resister vs. Output Current Value:
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Cascade Operation:
DIG 0-3
Dat a In
Vcc
Clo ck
LOAD
4
TB62 709a~D p
Dat a O ut
Vcc
Dat a In
TB62 709a~D p
Dat a O ut
Vcc
Dat a In
TB62 709a~D p
8
4
8
DIG 8-11
4
8
DIG 4-74444
4444
8888
8888
4444
8888
In order to update the display information within a specific driver
perform the following actions as appropriate.
Case 1. Digit 0–3:
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
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605
TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Outline:
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TOSHIBA Bi-CMOS Integrated
Circuit Silicon Monolithic
TB62709N/FTB62709N/F
TB62709N/F
TB62709N/FTB62709N/F
Outline:
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607
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