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gn1638

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by Ray

GN Semic LED Display Drivers, SOP-28-300mil. Datasheet-verified pinout, KiCad symbol/footprint/3D.

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GN1638

GN Semic · LED Display Drivers · SOP-28-300mil

GN1638 from GN Semic, in a SOP-28-300mil. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin Name Type Function
1 K1 input Key-scan data input 1. Data on this pin is latched after the end of the display cycle. Has an internal 10 kΩ pull-down (RL, K1K3).
2 K2 input Key-scan data input 2. Data on this pin is latched after the end of the display cycle. Has an internal ~10 kΩ pull-down.
3 K3 input Key-scan data input 3. Data on this pin is latched after the end of the display cycle. Has an internal ~10 kΩ pull-down.
4 VDD power_in Logic supply voltage. 5 V typical (3.0 V min, 5.5 V max recommended; absolute max 7.0 V). Tied together with pin 15.
5 SEG1/KS1 output Segment output 1 with muxed key-scan strobe KS1. P-channel open-drain, sourcing up to 25 mA typical (Vo = VDD-2V) for driving LED anodes; also drives the KS1 row of the 8x3 key matrix during scanning.
6 SEG2/KS2 output Segment output 2 with muxed key-scan strobe KS2. P-channel open-drain LED segment driver and key matrix row strobe.
7 SEG3/KS3 output Segment output 3 with muxed key-scan strobe KS3. P-channel open-drain LED segment driver and key matrix row strobe.
8 SEG4/KS4 output Segment output 4 with muxed key-scan strobe KS4. P-channel open-drain LED segment driver and key matrix row strobe.
9 SEG5/KS5 output Segment output 5 with muxed key-scan strobe KS5. P-channel open-drain LED segment driver and key matrix row strobe.
10 SEG6/KS6 output Segment output 6 with muxed key-scan strobe KS6. P-channel open-drain LED segment driver and key matrix row strobe.
11 SEG7/KS7 output Segment output 7 with muxed key-scan strobe KS7. P-channel open-drain LED segment driver and key matrix row strobe.
12 SEG8/KS8 output Segment output 8 with muxed key-scan strobe KS8. P-channel open-drain LED segment driver and key matrix row strobe.
13 SEG9 output Segment output 9. P-channel open-drain LED segment driver, sourcing up to 25 mA typical (Vo = VDD-2V). Not muxed with key scan.
14 SEG10 output Segment output 10. P-channel open-drain LED segment driver, sourcing up to 25 mA typical (Vo = VDD-2V). Not muxed with key scan.
15 VDD power_in Logic supply voltage (5 V ±10%). Tied together with pin 4.
16 GR8 output Grid (digit) output 8. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V. Connects to the common cathode of digit 8 in a common-cathode LED display.
17 GR7 output Grid (digit) output 7. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
18 GND power_in Logic ground. Connect to system ground; tied together with pin 25.
19 GR6 output Grid (digit) output 6. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
20 GR5 output Grid (digit) output 5. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
21 GR4 output Grid (digit) output 4. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
22 GR3 output Grid (digit) output 3. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
23 GR2 output Grid (digit) output 2. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
24 GR1 output Grid (digit) output 1. N-channel open-drain sink, IOL typ 140 mA @ Vo=0.3 V.
25 GND power_in Logic ground. Connect to system ground; tied together with pin 18.
26 DIO bidirectional Serial data input/output for the proprietary 3-wire (CLK/DIO/STB) interface, LSB first. N-channel open-drain when driving out; needs an external 1 k-10 kΩ pull-up (10 kΩ recommended) to VDD when reading key data. Data is sampled on the rising edge of CLK.
27 CLK input Serial clock input for the 3-wire interface. Data on DIO is shifted on the rising edge. Max clock frequency 1 MHz @ 50% duty cycle.
28 STB input Chip-select / strobe. A rising or falling edge initializes the serial interface; the first byte after STB goes low is interpreted as a command. When STB is high, CLK is ignored and any in-progress transfer is treated as invalid.

Key specifications

Parameter Value
Manufacturer GN Semic
Package SOP-28-300mil
Category LED-drv
Pins 28

CAD (KiCad official)

  • Symbol: GN1638
  • Footprint: Package_SO:SOP-28_8.4x18.16mm_P1.27mm
  • 3D model: SOP-28-300mil (KiCad packages3D, STEP)

Provenance

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

  • Datasheet: GN Semic datasheet (None pp, sha256 db9355f571cb2752, retrieved 2026-08-17, 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

Symbol & Footprint

Schematic Symbol

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