Datasheet TM1637 (Titan Micro Electronics) - 2
| Manufacturer | Titan Micro Electronics |
| Description | LED Drive Control Special Circuit |
| Pages / Page | 12 / 2 — LED Drive Control Special Circuit. Pin functions. Pin. Symbols. Pin name. … |
| File Format / Size | PDF / 705 Kb |
| Document Language | English |
LED Drive Control Special Circuit. Pin functions. Pin. Symbols. Pin name. Description. No. Read the key scan data
Model Line for this Datasheet
Text Version of Document
LED Drive Control Special Circuit
TM1637
Pin functions Pin Symbols Pin name Description No.
It is used for serial data input and output. The input data has a Data low level fluctuation while high level transfer at SCLK. Once DIO 17 input/output 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. Data input by Inputting the pin data here and it will be latched when the K1~K2 19-20 keyboard scan display cycle is over. Output Segment Output (also keyboard scan) and N-channel open SG1~SG8 2-9 (segment) drain output GRID6~GRID1 Output (bit) 10-15 Bit output and P-channel open drain output VDD Logic Supply 16 Anode power connection GND logic ground 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:
1 2 3 4 G G G G S S S S S1 S5 S9 S13 K1 S2 S6 S10 S14 K2 S3 S7 S11 S15 S4 S8 S12 S16 5 6 7 8 G G S S G G S S 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. 2 ©Titan Micro Electronics www.titanmec.com V2.4
TM1637
Pin functions Pin Symbols Pin name Description No.
It is used for serial data input and output. The input data has a Data low level fluctuation while high level transfer at SCLK. Once DIO 17 input/output 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. Data input by Inputting the pin data here and it will be latched when the K1~K2 19-20 keyboard scan display cycle is over. Output Segment Output (also keyboard scan) and N-channel open SG1~SG8 2-9 (segment) drain output GRID6~GRID1 Output (bit) 10-15 Bit output and P-channel open drain output VDD Logic Supply 16 Anode power connection GND logic ground 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:
1 2 3 4 G G G G S S S S S1 S5 S9 S13 K1 S2 S6 S10 S14 K2 S3 S7 S11 S15 S4 S8 S12 S16 5 6 7 8 G G S S G G S S 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. 2 ©Titan Micro Electronics www.titanmec.com V2.4
