# TM1681-LQFP48

**TM Shenzhen Titan Micro Elec** · LED Drivers · LQFP-48(7x7)

TM1681-LQFP48 from TM Shenzhen Titan Micro Elec, in a LQFP-48(7x7). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

## Pinout

| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | ROW10 | output | LED row drive output. |
| 2 | ROW9 | output | LED row drive output. |
| 3 | ROW8 | output | LED row drive output. |
| 4 | ROW7 | output | LED row drive output. |
| 5 | ROW6 | output | LED row drive output. |
| 6 | LED_VDD | power_in | LED driver positive supply; must be at the same voltage as VDD. |
| 7 | ROW5 | output | LED row drive output. |
| 8 | ROW4 | output | LED row drive output. |
| 9 | ROW3 | output | LED row drive output. |
| 10 | ROW2 | output | LED row drive output. |
| 11 | ROW1 | output | LED row drive output. |
| 12 | ROW0 | output | LED row drive output. |
| 13 | VSS | power_in | Logic supply negative terminal (ground). |
| 14 | OSC | bidirectional | Outputs the on-chip RC system clock in RC master mode; in slave or external-clock master mode the system clock is input here. |
| 15 | DATA | bidirectional | Serial data input/output. |
| 16 | WR | input | Write clock input; data on DATA is written into the TM1681 on the rising edge of WR. |
| 17 | RD | input | Read clock input; RAM data is output on DATA at the falling edge of RD and latched at the next rising edge. |
| 18 | CS | input | Chip select; when high data and command transfers are disabled and the serial interface is reset, when low transfers are enabled. |
| 19 | SYNC | bidirectional | Sync signal output in master or external-clock master mode; sync signal input in slave mode. |
| 20 | VDD | power_in | Logic supply positive terminal, operating range 2.4 to 5.5 V. |
| 21 | COM0 | output | LED common terminal (COM0), N-MOS or P-MOS open-drain selectable. |
| 22 | COM1 | output | LED common terminal (COM1), N-MOS or P-MOS open-drain selectable. |
| 23 | COM2 | output | LED common terminal (COM2), N-MOS or P-MOS open-drain selectable. |
| 24 | LED_VSS | power_in | LED driver negative supply; connect to VSS. |
| 25 | NC | unconnected | No connection. |
| 26 | COM3 | output | LED common terminal (COM3), N-MOS or P-MOS open-drain selectable. |
| 27 | COM4 | output | LED common terminal (COM4), N-MOS or P-MOS open-drain selectable. |
| 28 | COM5 | output | LED common terminal (COM5), N-MOS or P-MOS open-drain selectable. |
| 29 | COM6 | output | LED common terminal (COM6), N-MOS or P-MOS open-drain selectable. |
| 30 | COM7 | output | LED common terminal (COM7), N-MOS or P-MOS open-drain selectable. |
| 31 | NC | unconnected | No connection. |
| 32 | LED_VSS | power_in | LED driver negative supply; connect to VSS. |
| 33 | LED_VDD | power_in | LED driver positive supply; must be at the same voltage as VDD. |
| 34 | NC | unconnected | No connection. |
| 35 | NC | unconnected | No connection. |
| 36 | ROW23 | output | LED row drive output. |
| 37 | ROW22 | output | LED row drive output. |
| 38 | ROW21 | output | LED row drive output. |
| 39 | ROW20 | output | LED row drive output. |
| 40 | ROW19 | output | LED row drive output. |
| 41 | ROW18 | output | LED row drive output. |
| 42 | ROW17 | output | LED row drive output. |
| 43 | ROW16 | output | LED row drive output. |
| 44 | ROW15 | output | LED row drive output. |
| 45 | ROW14 | output | LED row drive output. |
| 46 | ROW13 | output | LED row drive output. |
| 47 | ROW12 | output | LED row drive output. |
| 48 | ROW11 | output | LED row drive output. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | TM Shenzhen Titan Micro Elec |
| Package | LQFP-48(7x7) |
| Category | LED Drivers |
| Pins | 48 |

## CAD (KiCad official)

- Symbol: `TM1681-LQFP48`
- Footprint: `Package_QFP:LQFP-48_7x7mm_P0.5mm`
- 3D model: LQFP-48(7x7) (KiCad packages3D, STEP)
- 3D model files: `tm1681-lqfp48-etched.step` / `tm1681-lqfp48-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `tm1681-lqfp48.step` / `tm1681-lqfp48.glb` are the bare package body.

## Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

- **Datasheet:** [TM Shenzhen Titan Micro Elec datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8603382922346967040) (19 pp, sha256 `ed140a0ed774d54e`, retrieved 2026-10-22, tier: lcsc)
- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.
- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
- **CAD:** KiCad official libraries (CC-BY-SA 4.0).

[Datasheet PDF](docs/tm1681-lqfp48-datasheet.pdf)