# IO Expander RGB LEDs ## Description Design of an RGB LED control system using a TCA6424A I/O expander. Features multiple RGB LEDs driven by resistors via an I2C interface. Integrates power supply and reset circuitry. ## Project Details - **Owner:** mmpp - **Created:** 2/4/2025 - **Last Updated:** 2/4/2025 - **Visibility:** Public - **License:** https://creativecommons.org/licenses/by/4.0/ ## Key Components ### J1 — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/vasy_skral/pin-header-01x06-254mm-vertical.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] ### LED1 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: ams-OSRAM USA INC. - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Part Type: LED **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED2 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Manufacturer Name: ams-OSRAM USA INC. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED3 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: ams-OSRAM USA INC. **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED4 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: ams-OSRAM USA INC. - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED5 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Manufacturer Name: ams-OSRAM USA INC. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED6 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Manufacturer Name: ams-OSRAM USA INC. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED7 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf - Part Type: LED - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Manufacturer Name: ams-OSRAM USA INC. - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### LED8 — [LTRBR37G-4R4S-0125-0-2-R18](https://www.flux.ai/vasy_skral/ltrbr37g-4r4s-0125-0-2-r18.md) - Manufacturer Name: ams-OSRAM USA INC. - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LTRBR37G-4R4S-0125-0-2-R18 - Part Type: LED - Datasheet URL: https://dammedia.osram.info/media/resource/hires/osram-dam-24639129/LTRB%20R37G_EN.pdf **Pins:** - A [pin 4] - B [pin 3] - G [pin 2] - R [pin 1] ### U1 — [TCA6424ARGJR](https://www.flux.ai/adrian95/tca6424argjr.md) - Part Type: Integrated Circuit - Manufacturer Part Number: TCA6424ARGJR - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/tca6424a.pdf - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~INT [pin 32] - ~RESET [pin 28] - ADDR [pin 26] - EP [pin 33] - GND [pin 25] - P00 [pin 1] - P01 [pin 2] - P02 [pin 3] - P03 [pin 4] - P04 [pin 5] - P05 [pin 6] - P06 [pin 7] - P07 [pin 8] - P10 [pin 9] - P11 [pin 10] - P12 [pin 11] - P13 [pin 12] - P14 [pin 13] - P15 [pin 14] - P16 [pin 15] - P17 [pin 16] - P20 [pin 17] - P21 [pin 18] - P22 [pin 19] - P23 [pin 20] - P24 [pin 21] - P25 [pin 22] - P26 [pin 23] - P27 [pin 24] - SCL [pin 29] - SDA [pin 30] - V_CCI [pin 31] - V_CCP [pin 27] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/mmpp/io-expander-rgb-leds](https://www.flux.ai/mmpp/io-expander-rgb-leds).* --- *Generated from [https://www.flux.ai/mmpp/io-expander-rgb-leds](https://www.flux.ai/mmpp/io-expander-rgb-leds)*