TM1637 Ver la hoja de datos (PDF) - Unspecified

Número de pieza

componentes Descripción

Fabricante

TM1637

LED Drive Control Special Circuit

Unspecified 

Pin functions

Symbols

DIO

CLK

K1~K2

SG1~SG8

GRID6~GRID1

Pin name

Data

input/output

Clock input

Data input by

keyboard scan

Output

(segment)

Output (bit)

LED Drive Control Special Circuit TM1637

Pin

No.

17

18

19-20

2-9

10-15

Description

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.

It is used for data input and output at rising edge.

Inputting the pin data here and it will be latched when the

display cycle is over.

Segment Output (also keyboard scan) and N-channel open

drain output

Bit output and P-channel open drain output

VDD

GND

Logic Supply

logic ground

16 Anode power connection

1

Grounding connection

Electrostatic discharge led by much static at dry weather or environment could damage the integrated circuit. TITAN MICRO

ELECTRONICS suggests you to take every measure to protect integrated circuit. ESD damage or decreased performance by

inappropriate operation or welding could lead to chip failure.

Read the key scan data

Key scan matrix of 8×2bit is shown as the following:

S1

S5

S9

S2

S6

S10

S3

S7

S11

S4

S8

S12

S13

K1

S14

K2

S15

S16

When a key is pressed, the key scan data is as follows: (Where low level is forward and high level is backward,

1110_1111 stands for 0xF7) .

SG1

SG2

SG3

SG4

SG5

SG6

SG7

SG8

K1

1110_1111 0110_1111 1010_1111 0010_1111 1100_1111 0100_1111 1000_1111 0000_1111

K2

1111_0111 0111_0111 1011_0111 0011_0111 1101_0111 0101_0111 1001_0111 0001_0111

Note: Where there is no key pressed down, the key read data should be 1111_1111 with forward low level and backward high level. Since

strong interference exists in the use of kitchen appliances, such as induction cooker, negative edge trigger mode was applied in TM1637 to

avoid mistake trigger, which is also the called “key jumping”. TM 1637 doesn’t support combined key pressing.

©Titan Micro Electronics

V2.4

2

www.titanmec.com

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