Special Circuit. TM1637 Datasheet

TM1637 Datasheet PDF


Part Number

TM1637

Description

LED Drive Control Special Circuit

Manufacture

Titan Micro

Total Page 12 Pages
Datasheet
Download TM1637 Datasheet


TM1637
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.
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
GRID6
1
2
3
4
5
6
7
8
9
10
20 K2
19 K1
18 CLK
17 DIO
16 VDD
15 GRID1
14 GRID2
13 GRID3
12 GRID4
11 GRID5
©Titan Micro Electronics
V2.4
1
www.titanmec.com

TM1637
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
S2 S6
S3 S7
S4 S8
S9
S10
S11
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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