# RTL8761BTV UART Breakout ## Description Prototype breadboard-friendly breakout board for the Realtek RTL8761BTV-CG Bluetooth 5 UART HCI controller, with 0.1 inch headers, 3.3 V power input, support passives, 40 MHz crystal, and RF antenna matching provisions. ## Project Details - **Owner:** jacksonyarger - **Created:** 7/16/2026 - **Last Updated:** 7/16/2026 - **Visibility:** Public ## Key Components ### J1 — [Pin Header 01x06 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x06-2p54mm-vertical~lzd.md) - Role: Connector - Role Details: 0.1 inch host UART/power header: 3V3, GND, TX, RX, RTS, CTS - 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] ### J2 — [Pin Header 01x10 2.54mm Vertical](https://www.flux.ai/adrian95/pin-header-01x10-254mm-vertical~u73.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Connector - Role Details: 0.1 inch auxiliary header for wake, disable, debug, PCM/GPIO signals **Pins:** - Pin_1 [pin 1] - Pin_10 [pin 10] - Pin_2 [pin 2] - Pin_3 [pin 3] - Pin_4 [pin 4] - Pin_5 [pin 5] - Pin_6 [pin 6] - Pin_7 [pin 7] - Pin_8 [pin 8] - Pin_9 [pin 9] ### J3 — [U.FL-R-SMT-1](https://www.flux.ai/vasy_skral/ufl-r-smt-1~yly.md) - Role Details: U.FL antenna connector after RF match/DC-block network - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/Hirose%20PDFs/UFL%20Series.pdf - Manufacturer Part Number: U.FL-R-SMT-1 - Manufacturer Name: Hirose Electric Co Ltd - Part Type: Connector - Role: RF Connector **Pins:** - 1 [pin 1] - 2 [pin 2-1] - 3 [pin 2-2] ### U1 — RTL8761BTV-CG - Part Type: Integrated Circuits - Manufacturer Part Number: RTL8761BTV-CG - Role Details: Realtek RTL8761BTV-CG QFN-32 UART HCI controller - Role: Bluetooth Controller - Frequency: 2.4GHz - Manufacturer Name: Realtek Semiconductor - Package or Case Code: 32-QFN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/f6270953e9c7367d9e0cd23f3cf35e09b0b9003e8692d98e09eda2e7f32f4765.pdf **Pins:** - BT_RFIO [pin 15] - BT_VD12RTXBB [pin 13] - BT_VD12RTXFE [pin 16] - BT_VD12SYN [pin 17] - BT_VD33PA [pin 14] - EP [pin 33] - GPIOA0_PCM_IN_ICFG0 [pin 25] - GPIOA1_PCM_OUT_ICFG1 [pin 26] - GPIOA10_WLAN_ACT [pin 3] - GPIOA11_DIS_BT_N [pin 12] - GPIOA13_HOST_WAKE_BT [pin 10] - GPIOA14_BT_WAKE_HOST_EEPROM_SEL [pin 11] - GPIOA15_CLK_REQ [pin 9] - GPIOA2_PCM_SYNC_ICFG2 [pin 27] - GPIOA23_LED_LOG [pin 29] - GPIOA3_PCM_CLOCK_ICFG3 [pin 28] - GPIOA4_UART_CTS [pin 21] - GPIOA5_UART_RTS_32K_IN [pin 20] - GPIOA6_UART_OUT [pin 22] - GPIOA7_UART_IN [pin 23] - GPIOA8_BT_STE_TEST_MODE_SEL [pin 2] - GPIOA9_BT_ACT_SPS_LDO_SEL [pin 4] - GPIOB0_RT_SDA [pin 7] - GPIOB1_RT_SCL [pin 6] - GPIOB2_RT_INT [pin 5] - REG_IN [pin 1] - REG_OUT [pin 32] - VDD12BT [pin 31] - VDDIO33 [pin 30] - VIO_SB [pin 8] - VIO_UART [pin 24] - XI [pin 18] - XO [pin 19] ### Y1 — [CX2016DB40000D0FLJCC](https://www.flux.ai/adrian95/cx2016db40000d0fljcc~k8u.md) - Part Type: Oscillator - License: https://creativecommons.org/licenses/by/4.0/ - Role: Clock - Role Details: 40 MHz crystal for RTL8761BTV XI/XO - Manufacturer Name: KYOCERA AVX - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1139/CX2016DB_Series_Spec.pdf - Manufacturer Part Number: CX2016DB40000D0FLJCC **Pins:** - GND_1 [pin 2] - GND_2 [pin 4] - HOT_1 [pin 1] - HOT_2 [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/jacksonyarger/rtl8761btv-uart-breakout~6d](https://www.flux.ai/jacksonyarger/rtl8761btv-uart-breakout~6d).* --- *Generated from [https://www.flux.ai/jacksonyarger/rtl8761btv-uart-breakout~6d](https://www.flux.ai/jacksonyarger/rtl8761btv-uart-breakout~6d)*