Velleman 4-Digit Display Datasheet-2

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LED Drive Control Special Circuit TM1637

©Titan Micro Electronics www.titanmec.com

V2.4

Features description

TM1637 is a kind of LED (light-emitting diode display) drive control special circuit with keyboard

scan interface and it's internally integrated with MCU digital interface, data latch, LED high pressure

drive and keyboard scan. This product is in DIP20/SOP20 package type with excellent performance and

high quality, which is mainly applicable to the display drive of induction cooker, micro-wave oven and

small household electrical appliance.

Function features

 Applied power CMOS technique

 The display mode (8 segments*6 bit) supports output by common anode LED.

 Keyboard scan (8×2bit), with enhanced identification circuit with anti-interference keys

 Luminance adjustment circuit (adjustable 8 duty ratio)

 Two-wire serial interface (CLK, DIO)

 Oscillating type: Built-in RC oscillator

 Built-in power-on reset circuit

 Built-in automatic blanking circuit

 Package type: DIP20/SOP20

Pin information

GND

SEG1/ KS1

SEG2/ KS2

SEG3/ KS3

SEG4/ KS4

SEG5/ KS5

SEG6/ KS6

SEG7/ KS7

SEG8/ KS8

GRID1

GRID2

GRID3

GRID4

GRID5GRID6

VDD

DIO

CLK

10 11

Summary of content (12 pages)

PAGE 1
LED Drive Control Special Circuit TM1637 Features description TM1637 is a kind of LED (light-emitting diode display) drive control special circuit with keyboard scan interface and it's internally integrated with MCU digital interface, data latch, LED high pressure drive and keyboard scan. This product is in DIP20/SOP20 package type with excellent performance and high quality, which is mainly applicable to the display drive of induction cooker, micro-wave oven and small household electrical appliance.
PAGE 2
LED Drive Control Special Circuit TM1637 Pin functions Symbols Pin name Pin No. Description DIO Data input/output 17 It is used for serial data input and output. The input data has a low level fluctuation while high level transfer at SCLK. Once one bit is transferred, one ACK is generated at failing edge of the 8th clock inside the chip. CLK Clock input 18 It is used for data input and output at rising edge.
PAGE 3
TM1637 LED Drive Control Special Circuit Display register address Stored data in the register is transferred to the TM1637 from outside elements by serial interface, with 6 bytes units of address from C0H to C5H in correspondence with the LED lights connected with SEG pin and GRID pin on the chip.LED data is displayed from low level to high level in respect of display address, and should be operated from low level to high level in respect of data bytes.
PAGE 4
TM1637 LED Drive Control Special Circuit 2、 Write SRAM data in address auto increment 1 mode.
PAGE 5
LED Drive Control Special Circuit 2、Address command setting MSB TM1637 LSB B7 B6 1 1 1 1 1 1 1 1 1 1 1 1 B5 B4 Zero should be inserted for irrelevant items. B3 B2 B1 B0 Display address 0 0 0 0 C0H 0 0 0 1 C1H 0 0 1 0 C2H 0 0 1 1 C3H 0 1 0 0 C4H 0 1 0 1 C5H The command is used to set the display register address. If the address is set as C6H or a higher one, the data will be ignored until effective address is set.
PAGE 6
LED Drive Control Special Circuit TM1637 Program flow chart 1、Flow chart of program using address auto increment 1 mode Start Initialization Send memory write command Set the initial address Transfer multiple words continuously Send display control command Send read key command Read key command and store into the MCU register Is a key pressed down? YES Key processing program NO End 6 ©Titan Micro Electronics www.titanmec.com V2.
PAGE 7
LED Drive Control Special Circuit TM1637 2、Flow chart of program design using fixed address Start Initialization Send memory write command Set the memory address Transfer data of 1 byte NO Whether the data has been transferred completely? Send display control command Send read key command Read key command and store into the MCU register Is a key pressed down? YES Key processing program NO End 7 ©Titan Micro Electronics www.titanmec.com V2.
PAGE 8
TM1637 LED Drive Control Special Circuit Hardware connection drawing Nixie tube in circuit diagram is common anode one.
PAGE 9
TM1637 LED Drive Control Special Circuit Electrical parameter 1、 Limit parameter (Ta = 25℃, Vss = 0 V) Parameters Symbol Range Unit Logic power supply voltage VDD -0.5 ～+7.0 V Logic input voltage VI1 -0.5 ～ VDD + 0.
PAGE 10
TM1637 LED Drive Control Special Circuit Input current II - - High-level input voltage VIH 0.7 VDD - Low-level input voltage VIL - - Lagging voltage VH - dynamic current loss IDDdyn - ±1 μA VI = VDD / VSS V CLK，DIN 0.3 VDD V CLK，DIN 0.35 - V CLK，DIN - 5 mA Non-loaded, display OFF 4、Switching character (Ta = -40 - +85℃, VDD = 4.5 - 5.
PAGE 11
LED Drive Control Special Circuit TM1637 IC Package diagram DIP20 Symbol A A1 A2 B B1 C D E E1 e L E2 B2 Minimum 3.71 0.50 3.20 0.33 0.20 25.70 6.20 7.32 3.00 8.20 0.87 Unit: mm Typical value 4.00 0.60 3.40 0.45 1.525(TYP) 0.28 26.00 6.40 7.78 2.54(TYP) 3.30 8.70 1.02 Maximum value 4.31 0.80 3.60 0.53 0.36 26.54 6.75 8.25 3.60 9.10 1.17 11 ©Titan Micro Electronics www.titanmec.com V2.
PAGE 12
LED Drive Control Special Circuit TM1637 SOP20 All specs and applications shown above subject to change without prior notice. 12 ©Titan Micro Electronics www.titanmec.com V2.