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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.

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HTM1628

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.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); htm1628.step / htm1628.glb are 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).

Datasheet PDF