# Scrawny Indigo Holodeck ## Description Dual K-Line & L-Line RP2040 Interface with L9613 Transceivers and JST VH Connectivity ## Project Details - **Owner:** ztripez - **Created:** 12/9/2025 - **Last Updated:** 12/9/2025 - **Visibility:** Public - **System Architecture:** ```mermaid flowchart TD RP2040["RP2040 MCU"] L9613A["L9613 Channel1"] L9613B["L9613 Channel2"] LDriver["Discrete L Driver"] J10["JST VH 10-pin Connector"] VBattNet["VBatt"] GNDNet["GND"] K1Net["K1"] K2Net["K2"] LNet["L"] RP2040 -->|UART0| L9613A RP2040 -->|UART1| L9613B RP2040 -->|GPIO| LDriver J10 --> VBattNet J10 --> GNDNet J10 --> K1Net J10 --> K2Net J10 --> LNet L9613A --> K1Net L9613B --> K2Net LDriver --> LNet ``` ## Key Components ### J10 — [B10B-XASK-1-A(LF)(SN)](https://www.flux.ai/lcsc/b10b-xask-1-alfsn.md) - Product Info Url: https://lcsc.com/product-detail/Wire-To-Board-Wire-To-Wire-Connector_JST-Sales-America-B10B-XASK-1-A-LF-SN_C378928.html - Role Details: JST VH series 10-pin connector for VBatt, GND, K1, K2, L, and NC pins - Package: CONN-TH_10P-P3.96_B10B-XASK-1-A-LF-SN - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_JST-B10B-XASK-1-A-LF-SN_C378928.pdf - LCSC Part Number: C378928 - Manufacturer Name: JST - Manufacturer Part Number: B10B-XASK-1-A(LF)(SN) - Package or Case Code: CONN-TH_B10B-XASK-1-A-LF-SN - Part Type: Wire To Board / Wire To Wire Connector - Role: Connector - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 10 [pin 10] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] - 7 [pin 7] - 8 [pin 8] - 9 [pin 9] ### Q1 — [MMBT3904LT1G](https://www.flux.ai/openpartlist/mmbt3904lt1g.md) - Role Details: Discrete L-line low-side driver transistor - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.onsemi.com/pdf/datasheet/mmbt3904lt1-d.pdf - Manufacturer Part Number: MMBT3904LT1G - Role: Switching - Manufacturer Name: onsemi - Part Type: Transistor **Pins:** - B [pin 1] - C [pin 3] - E [pin 2] ### U1 — [RP2040](https://www.flux.ai/jecstronic/rp2040.md) - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://datasheets.raspberrypi.com/rp2040/rp2040-datasheet.pdf - Manufacturer Name: Raspberry Pi - Manufacturer Part Number: SC0914(7) - Role: Main MCU - Part Type: Integrated Circuit **Pins:** - ADC_AVDD [pin 43] - DVDD [pin 50] - DVDD [pin 23] - GND [pin 57] - GPIO0 [pin 2] - GPIO1 [pin 3] - GPIO10 [pin 13] - GPIO11 [pin 14] - GPIO12 [pin 15] - GPIO13 [pin 16] - GPIO14 [pin 17] - GPIO15 [pin 18] - GPIO16 [pin 27] - GPIO17 [pin 28] - GPIO18 [pin 29] - GPIO19 [pin 30] - GPIO2 [pin 4] - GPIO20 [pin 31] - GPIO21 [pin 32] - GPIO22 [pin 34] - GPIO23 [pin 35] - GPIO24 [pin 36] - GPIO25 [pin 37] - GPIO26/ADC0 [pin 38] - GPIO27/ADC1 [pin 39] - GPIO28/ADC2 [pin 40] - GPIO29/ADC3 [pin 41] - GPIO3 [pin 5] - GPIO4 [pin 6] - GPIO5 [pin 7] - GPIO6 [pin 8] - GPIO7 [pin 9] - GPIO8 [pin 11] - GPIO9 [pin 12] - IOVDD [pin 49] - IOVDD [pin 42] - IOVDD [pin 10] - IOVDD [pin 1] - IOVDD [pin 22] - IOVDD [pin 33] - QSPI_CSN [pin 56] - QSPI_SCLK [pin 52] - QSPI_SD0 [pin 53] - QSPI_SD1 [pin 55] - QSPI_SD2 [pin 54] - QSPI_SD3 [pin 51] - RUN [pin 26] - SWCLK [pin 24] - SWD [pin 25] - TESTEN [pin 19] - USB_DM [pin 46] - USB_DP [pin 47] - USB_VDD [pin 48] - VREG_VIN [pin 44] - VREG_VOUT [pin 45] - XIN [pin 20] - XOUT [pin 21] ### U2 — [L9613B](https://www.flux.ai/lcsc/l9613b.md) - Product Info Url: https://lcsc.com/product-detail/Interface-ICs_STMicroelectronics_L9613B_STMicroelectronics-L9613B_C262917.html - Manufacturer Part Number: L9613B - JLCPCB Part Class: Extended Part - Package: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - Role Details: K-line transceiver channel 1 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409301504_STMicroelectronics-L9613B_C262917.pdf - LCSC Part Number: C262917 - Manufacturer Name: ST(意法半导体) - Part Type: Interface - Specialized - Role: K-line Transceiver **Pins:** - GND [pin 5] - K [pin 6] - LI [pin 8] - LO [pin 2] - RX [pin 1] - TX [pin 4] - VCC [pin 3] - VS [pin 7] ### U3 — [L9613B](https://www.flux.ai/lcsc/l9613b.md) - Product Info Url: https://lcsc.com/product-detail/Interface-ICs_STMicroelectronics_L9613B_STMicroelectronics-L9613B_C262917.html - JLCPCB Part Class: Extended Part - Manufacturer Part Number: L9613B - Package: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - LCSC Part Number: C262917 - Role Details: K-line transceiver channel 2 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409301504_STMicroelectronics-L9613B_C262917.pdf - Package or Case Code: SO-8_L4.9-W3.9-P1.27-LS6.0-BL - Role: K-line Transceiver - Manufacturer Name: ST(意法半导体) - Part Type: Interface - Specialized **Pins:** - GND [pin 5] - K [pin 6] - LI [pin 8] - LO [pin 2] - RX [pin 1] - TX [pin 4] - VCC [pin 3] - VS [pin 7] ### U4 — [MX25R3235FM2xx0](https://www.flux.ai/kicad-part-library/mx25r3235fm2xx0.md) - Role: External QSPI Flash - Datasheet URL: http://www.macronix.com/Lists/Datasheet/Attachments/7534/MX25R3235F,%20Wide%20Range,%2032Mb,%20v1.6.pdf - Package or Case Code: SOP-8_5.28x5.23mm_P1.27mm - Role Details: Placeholder SPI flash for RP2040 external QSPI flash - Manufacturer Part Number: MX25R3235FM2xx0 **Pins:** - ~{CS} [pin 1] - ~{RESET}/SIO3 [pin 7] - ~{WP}/SIO2 [pin 3] - GND [pin 4] - SCLK [pin 6] - SI/SIO0 [pin 5] - SO/SIO1 [pin 2] - VCC [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ztripez/scrawny-indigo-holodeck](https://www.flux.ai/ztripez/scrawny-indigo-holodeck).* --- *Generated from [https://www.flux.ai/ztripez/scrawny-indigo-holodeck](https://www.flux.ai/ztripez/scrawny-indigo-holodeck)*