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HTM1628
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TDSEMIC LED Drivers, SSOP-28. Pinout reviewed by a person against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
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PCB Footprint
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Datasheet
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README
markdownHTM1628
TDSEMIC · LED Drivers · SSOP-28
HTM1628 from TDSEMIC, in a SSOP-28. 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 | NC | unconnected | No connect; leave floating per datasheet. |
| 2 | DI/O | bidirectional | 3-wire serial data input/output; VIH ≥ 0.7 VDD, VIL ≤ 0.2 VDD, input leakage ≤ ±1 µA; outputs key data on read cycles. |
| 3 | CLK | input | Serial clock input; fmax 1 MHz, clock pulse width ≥ 400 ns; data latched on rising edge. |
| 4 | STB | input | Chip-select (strobe) input, active-low to start serial transfer; pulse width ≥ 1 µs; driving STB high mid-transfer aborts the command. |
| 5 | K1 | input | Key-scan matrix row input 1; internal 10 kΩ (typ.) pull-down resistor; sampled once per display scan cycle (~3.12 ms). |
| 6 | K2 | input | Key-scan matrix row input 2; internal 10 kΩ (typ.) pull-down resistor; sampled once per display scan cycle (~3.12 ms). |
| 7 | VDD | power_in | Supply voltage; 2.8 V - 5.5 V (abs. max −0.5 V to +7.0 V); quiescent current 200 µA typ. with no load at VDD = 5 V. |
| 8 | SEG1/KS1 | output | Segment 1 / key-scan column 1 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 9 | SEG2/KS2 | output | Segment 2 / key-scan column 2 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 10 | SEG3/KS3 | output | Segment 3 / key-scan column 3 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 11 | SEG4/KS4 | output | Segment 4 / key-scan column 4 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 12 | SEG5/KS5 | output | Segment 5 / key-scan column 5 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 13 | SEG6/KS6 | output | Segment 6 / key-scan column 6 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 14 | SEG7/KS7 | output | Segment 7 / key-scan column 7 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 15 | SEG8/KS8 | output | Segment 8 / key-scan column 8 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 16 | SEG9/KS9 | output | Segment 9 / key-scan column 9 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 17 | SEG10/KS10 | output | Segment 10 / key-scan column 10 output; P-type open-drain; IOH −25 mA typ., −50 mA max at VO = VDD−3 V. |
| 18 | GND | power_in | Ground; supply return, placed adjacent to SEG/GRID multiplex outputs to minimise impedance. |
| 19 | SEG12/GRID7 | output | Segment 12 / grid 7 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode; supports both SEG and GRID drive. |
| 20 | SEG13/GRID6 | output | Segment 13 / grid 6 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode. |
| 21 | SEG14/GRID5 | output | Segment 14 / grid 5 multiplex output; P-type open-drain in segment mode, N-type open-drain in grid mode. |
| 22 | GND | power_in | Ground; supply return, placed between multiplex outputs and GRID outputs. |
| 23 | GRID4 | output | Grid (digit select) 4 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V. |
| 24 | GRID3 | output | Grid (digit select) 3 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V. |
| 25 | GND | power_in | Ground; supply return, placed between GRID4/GRID3 and GRID2/GRID1 pins. |
| 26 | GRID2 | output | Grid (digit select) 2 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V. |
| 27 | GRID1 | output | Grid (digit select) 1 output; N-type open-drain; IOL 80 mA min, 100 mA typ. at VO = 0.31 V. |
| 28 | GND | power_in | Ground; supply return, placed at package corner adjacent to GRID1. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | TDSEMIC |
| Package | SSOP-28 |
| Category | LED Drivers |
| Pins | 28 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| 电源电压 (supply voltage) | VDD | -0.5 | 7 | V | 6 | ||
| 逻辑输入电压 (logic input voltage) | VIN | -0.5 | V | 6 | |||
| 输出高电平驱动 (SEG) (output high-level drive) | IO1 | -50 | mA | 6 | |||
| 输出低电平驱动 (GRID) (output low-level drive) | IO2 | 150 | mA | 6 | |||
| 储存温度 (storage temperature) | Tstg | -65 | 150 | °C | 6 | ||
| ESD 静电 (HBM) | -5500 | 5500 | V | HBM | 6 | ||
| 逻辑电源电压 (logic supply voltage) | VDD | 2.8 | 5 | 5.5 | V | 7 | |
| 输出高电平驱动 (output high-level drive) | IOH1 | -20 | -25 | -40 | mA | SEG1～SEG16, VO=VDD-2V; VDD=5V | 7 |
| 输出高电平驱动 (output high-level drive) | IOH2 | -20 | -30 | -50 | mA | SEG1～SEG16, VO=VDD-3V; VDD=5V | 7 |
| 输出低电平驱动 (output low-level drive) | IOL | 80 | 100 | mA | GRID1～GRID8, VO=0.3V; VDD=5V | 7 | |
| 输出电流 (DOUT output current) | IDO | 4 | 8 | mA | VO=0.4V, DOUT; VDD=5V | 7 | |
| 高电平输出电流容许量 (high-level output current tolerance) | ITOLSG | 5 | % | VO=VDD-3V, SEG1～SEG16; VDD=5V | 7 | ||
| 滞后电压 (hysteresis voltage) | VH | 0.35 | V | CLK, DIN/DIO, STB; VDD=5V | 7 | ||
| 输入漏电流 (input leakage current) | IIN | -1 | 1 | uA | VIN=VDD/GND, STB, CLK, DIN/DIO; VDD=5V | 7 | |
| 静态电流 (quiescent current) | IDD | 200 | uA | no load, VIN=VDD; VDD=5V | 7 | ||
| 输入下拉电阻 (input pull-down resistance) | RL | 10 | kΩ | K0~K3 | 7 | ||
| 振荡频率 (oscillation frequency) | fOSC | 275 | kHz | VDD=4.5～5.5V | 7 | ||
| 上升时间 (rise time, SEG) | tTZH | 2 | us | SEG1～SEG16, CL=300pF; VDD=4.5～5.5V | 7 | ||
| 上升时间 (rise time, GRID) | tTZH | 0.5 | us | GRID1～GRID8; VDD=4.5～5.5V | 7 | ||
| 下降时间 (fall time) | tTHZ | 120 | us | CL=300pF, SEGn, GRIDn; VDD=4.5～5.5V | 7 | ||
| 最大时钟频率 (maximum clock frequency) | fmax | 1 | MHz | duty cycle 50%; VDD=4.5～5.5V | 7 | ||
| 时钟脉冲宽度 (clock pulse width) | PWCLK | 400 | ns | VDD=4.5～5.5V | 7 | ||
| 选通脉冲宽度 (strobe pulse width) | PWSTB | 1 | us | VDD=4.5～5.5V | 7 | ||
| 数据建立时间 (data setup time) | tSETUP | 100 | ns | VDD=4.5～5.5V | 7 | ||
| 数据保持时间 (data hold time) | tHOLD | 100 | ns | VDD=4.5～5.5V | 8 | ||
| CLK→STB 时间 (CLK to STB time) | tCLK-STB | 1 | us | CLK↑→STB↑; VDD=4.5～5.5V | 8 | ||
| 等待时间 (wait time) | tWAIT | 1 | us | CLK↑→CLK↓; VDD=4.5～5.5V | 8 |
CAD (KiCad official)
- Symbol:
HTM1628 - Footprint:
Package_SO:SSOP-28_5.3x10.2mm_P0.65mm - 3D model: SSOP-28 (KiCad packages3D, STEP)
- 3D model files:
htm1628-etched.step/htm1628-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);htm1628.step/htm1628.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: TDSEMIC datasheet (29 pp, sha256
69d95f3691eb87c0, retrieved 2026-10-21, 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).