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TM1637 chip documentation
| Symbol | Pin name | Pin number | Description |
|---|---|---|---|
| DIO | Data input output | 17 | Input/output serial data during the rising of shift clock, from low. |
| CLK | Clock input | 18 | Output/input serial data at the rising edge |
| K1~K2 | Key-scan data input | 19-20 | The data inputted into the Pin would be latch after display cycle close |
| SEG1~SEG8 | Output (segment) | 2-9 | Segment output, p pipe open-drain output |
| GRID6~GRID1 | Output (grid) | 10-15 | Grid output, N pipe open-drain output |
| VDD | Logic power | 16 | 5V |
| GND | Logic ground | 1 | Connect ground system |
| Start | Byte | Stop |
|---|---|---|
| S | Command | T |
| Start | Byte | Data | Stop |
|---|---|---|---|
| S | Command | 1..N data Bytes | T |
Instructions are used to set the display mode and LED driver status. The first byte entered by DIO after a falling edge of CLK acts as an instruction. After decoding, take the highest B7, B6 two bits to distinguish different Instruction.
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | Instruction |
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | Data command | ||||||
| 1 | 0 | Display control command | ||||||
| 1 | 1 | Address command |
This command is used to set the data to be written and read. The B1 and B0 bits do not allow setting 01 or 11.
| B7 | B6 | B4 | B3 | B2 | B1 | B0 | Instruction | |
|---|---|---|---|---|---|---|---|---|
| 0 | 1 | 0 | 0 | Write data to register | ||||
| 0 | 1 | 1 | 0 | Read key-scan data | ||||
| 0 | 1 | 0 | Auto address increment | |||||
| 0 | 1 | 1 | Fixed address | |||||
| 0 | 1 | 0 | Normal mode | |||||
| 0 | 1 | 1 | Test mode (not documented) |
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | Display address |
|---|---|---|---|---|---|---|---|---|
| 1 | 0 | 0 | 0 | 0 | Set pulse width is 1/16 | |||
| 1 | 0 | 0 | 0 | 1 | Set pulse width is 2/16 | |||
| 1 | 0 | 0 | 1 | 0 | Set pulse width is 4/16 | |||
| 1 | 0 | 0 | 1 | 1 | Set pulse width is 10/16 | |||
| 1 | 0 | 1 | 0 | 0 | Set pulse width is 12/16 | |||
| 1 | 0 | 1 | 0 | 1 | Set pulse width is 13/16 | |||
| 1 | 0 | 1 | 1 | 0 | Set pulse width is 13/16 | |||
| 1 | 0 | 1 | 1 | 1 | Set pulse width is 14/16 | |||
| 1 | 0 | 0 | Display off | |||||
| 1 | 0 | 1 | Display on |
| B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | Display address |
|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 0 | 0 | 0xC0 | |||
| 1 | 1 | 0 | 0 | 1 | 0xC1 | |||
| 1 | 1 | 0 | 1 | 0 | 0xC2 | |||
| 1 | 1 | 0 | 1 | 1 | 0xC3 | |||
| 1 | 1 | 1 | 0 | 0 | 0xC4 | |||
| 1 | 1 | 1 | 0 | 1 | 0xC5 |
When power on, address default 0x00.
This register stores the data transferred from the external device to the TM1637 via the serial interface. The address 00H-05H consists of 6 bytes in total and is connected to the core SEG and GRID pin LED lights connected to the corresponding distribution as shown below: Write LED display data, according to from the display address from low to high, from the data byte low to high operation.
| SEG1 | SEG2 | SEG3 | SEG4 | SEG5 | SEG6 | SEG7 | SEG8 | |
|---|---|---|---|---|---|---|---|---|
| B0 | B1 | B2 | B3 | B4 | B5 | B6 | B7 | |
| GRID1 | ||||||||
| GRID2 | ||||||||
| GRID3 | ||||||||
| GRID4 | ||||||||
| GRID5 | ||||||||
| GRID6 |