# ESP32/ eMMC Module ## Description ESP32 /eMMC Integration with Bidirectional Level Shifting Project Overview: This project aims to integrate an ESP32 microcontroller with an eMMC (embedded Multi Media Card) storage module to create a robust data processing and storage solution. The system utilizes bidirectional level shifting to ensure seamless communication between the 3.3V logic of the ESP32 and the 1.8V logic of the eMMC, enabling efficient data handling and processing. Objectives: Data Storage and Processing: Leverage the high-speed capabilities of the eMMC for data storage while offloading processing tasks from the ESP32 to enhance overall system performance. Voltage Level Compatibility: Implement a bidirectional level shifting solution to facilitate communication between the ESP32 and eMMC, ensuring signal integrity and compatibility across different voltage levels. Modular Design: Create a modular and scalable design that can be easily adapted for various applications, including IoT devices, data logging systems, and embedded applications. Key Components: ESP32 Microcontroller: A powerful microcontroller with integrated Wi-Fi and Bluetooth capabilities, ideal for IoT applications. eMMC Storage Module: A high-speed storage solution that provides ample memory for data-intensive applications. Bidirectional Level Shifter: A 20-channel level shifter (74LVC4245 and TXB0104D) to convert signals between 1.8V and 3.3V, ensuring reliable communication between the ESP32 and eMMC. Power Management: Utilize a MIC5205 LDO voltage regulator to step down the 3.3V supply to 1.8V for the eMMC, ensuring stable power delivery. Implementation Steps: Circuit Design: Design the circuit schematic, including connections for the ESP32, eMMC, level shifter, and power management components. PCB Layout: Create a PCB layout that optimizes trace lengths for high-speed signals, ensuring proper length matching and minimizing noise. Firmware Development: Develop firmware for the ESP32 to handle data reading, writing, and processing tasks, as well as managing communication with the eMMC. Testing and Validation: Conduct thorough testing to validate the functionality of the system, ensuring reliable data transfer and processing capabilities. Expected Outcomes: A fully functional system that demonstrates the integration of the ESP32 with eMMC storage, showcasing efficient data handling and processing. A modular design that can be adapted for various applications, providing a foundation for future projects in IoT and embedded systems. ## Project Details - **Owner:** davetheman - **Created:** 3/28/2025 - **Last Updated:** 3/30/2025 - **Visibility:** Public ## Key Components ### 74LVC4245 — [74LVC4245ABQ,118](https://www.flux.ai/lcsc/74lvc4245abqc118~a288.md) - Part Type: Translators / Level Shifters - JLCPCB Part Class: Extended Part - Package or Case Code: DHVQFN24_L5.5-W3.5-P0.50-BL-EP - Product Info Url: https://lcsc.com/product-detail/presales_Nexperia-74LVC4245ABQ-118_C548795.html - LCSC Part Number: C548795 - Manufacturer Name: Nexperia(安世) - Manufacturer Part Number: 74LVC4245ABQ,118 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2407241043_Nexperia-74LVC4245ABQ-118_C548795.pdf **Pins:** - ~{OE} [pin 22] - A0 [pin 3] - A1 [pin 4] - A2 [pin 5] - A3 [pin 6] - A4 [pin 7] - A5 [pin 8] - A6 [pin 9] - A7 [pin 10] - B0 [pin 21] - B1 [pin 20] - B2 [pin 19] - B3 [pin 18] - B4 [pin 17] - B5 [pin 16] - B6 [pin 15] - B7 [pin 14] - DIR [pin 2] - GND [pin 13] - GND [pin 25] - GND [pin 12] - GND [pin 11] - VCCA [pin 1] - VCCB [pin 23] - VCCB [pin 24] ### J1 — [Pin Header 01x02 2.54mm Vertical](https://www.flux.ai/jharwinbarrozo/generic-pin-header-01x02-2p54mm-vertical~4uy.md) - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - P1 [pin 1] - P2 [pin 2] ### J2 — [Pin Socket 01x02 2.54mm Vertical](https://www.flux.ai/adrian95/pin-socket-01x02-254mm-vertical~k8w.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - Pin_1 [pin 1] - Pin_2 [pin 2] ### J4 — [Pin Socket 01x10 2.54mm Vertical for ADS1115](https://www.flux.ai/jan1104/pin-socket-01x10-2p54mm-vertical-for-ads1115~xc.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - A0 [pin 7] - A1 [pin 8] - A2 [pin 9] - A3 [pin 10] - ADDR [pin 5] - ALRT [pin 6] - GND [pin 2] - SCL [pin 3] - SDA [pin 4] - VDD [pin 1] ### J5 — [Header 01x10 2.54mm](https://www.flux.ai/tpetrovic2/header-01x10-2p54mm~54.md) **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] ### KLM8G — [KLM8G1GETF-B041](https://www.flux.ai/lcsc/klm8g1getf-b041~whs.md) - Manufacturer Name: SAMSUNG(三星半导体) - LCSC Part Number: C499918 - Operating Temperature: -25℃~+85℃ - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2007301503_Samsung-KLM8G1GETF-B041_C499918.pdf - Voltage Supply: 2.7V~3.6V - Part Type: eMMC - JLCPCB Part Class: Extended Part - Product Info Url: https://lcsc.com/product-detail/New-Arrivals_Samsung-Electro-Mechanics-KLM8G1GERF-B041_C499918.html - Package or Case Code: FBGA-153_L13.0-W11.5-P0.50_KLMAG1JETD-B041 - Manufacturer Part Number: KLM8G1GETF-B041 **Pins:** - CLK [pin M6] - CMD [pin M5] - DAT0 [pin A3] - DAT1 [pin A4] - DAT2 [pin A5] - DAT3 [pin B2] - DAT4 [pin B3] - DAT5 [pin B4] - DAT6 [pin B5] - DAT7 [pin B6] - DataStrobe [pin H5] - NC [pin J12] - NC [pin D2] - NC [pin D1] - NC [pin E2] - NC [pin H14] - NC [pin B12] - NC [pin E12] - NC [pin A12] - NC [pin G14] - NC [pin H12] - NC [pin G13] - NC [pin L12] - NC [pin J1] - NC [pin C10] - NC [pin P9] - NC [pin B7] - NC [pin H1] - NC [pin M3] - NC [pin A2] - NC [pin C1] - NC [pin A9] - NC [pin B9] - NC [pin M10] - NC [pin D4] - NC [pin L1] - NC [pin M11] - NC [pin C8] - NC [pin K14] - NC [pin M14] - NC [pin J13] - NC [pin K1] - NC [pin G2] - NC [pin E3] - NC [pin L2] - NC [pin N3] - NC [pin F2] - NC [pin N13] - NC [pin A13] - NC [pin M9] - NC [pin C11] - NC [pin K2] - NC [pin P14] - NC [pin N6] - NC [pin N9] - NC [pin B8] - NC [pin G1] - NC [pin F12] - NC [pin J3] - NC [pin E1] - NC [pin C5] - NC [pin E13] - NC [pin A11] - NC [pin D13] - NC [pin L13] - NC [pin F1] - NC [pin J14] - NC [pin A8] - NC [pin L3] - NC [pin K3] - NC [pin C14] - NC [pin B10] - NC [pin H2] - NC [pin K12] - NC [pin P12] - NC [pin K13] - NC [pin N7] - NC [pin G12] - NC [pin P13] - NC [pin A14] - NC [pin L14] - NC [pin P8] - NC [pin D3] - NC [pin C12] - NC [pin M2] - NC [pin B14] - NC [pin D12] - NC [pin M1] - NC [pin F13] - NC [pin C9] - NC [pin C13] - NC [pin A10] - NC [pin H13] - NC [pin P1] - NC [pin P2] - NC [pin A1] - NC [pin B1] - NC [pin N10] - NC [pin N1] - NC [pin C3] - NC [pin J2] - NC [pin N12] - NC [pin N8] - NC [pin D14] - NC [pin N14] - NC [pin E14] - NC [pin C7] - NC [pin H3] - NC [pin F14] - NC [pin B13] - NC [pin B11] - NC [pin F3] - NC [pin M7] - NC [pin M8] - NC [pin P11] - NC [pin N11] - NC [pin M13] - NC [pin M12] - RFU [pin G3] - RFU [pin E9] - RFU [pin K10] - RFU [pin P7] - RFU [pin K6] - RFU [pin G10] - RFU [pin E10] - RFU [pin F10] - RFU [pin K7] - RFU [pin E8] - RFU [pin A7] - RFU [pin E5] - RFU [pin P10] - RSTN [pin K5] - VCC [pin F5] - VCC [pin E6] - VCC [pin J10] - VCCQ [pin C6] - VCCQ [pin M4] - VCCQ [pin P3] - VCCQ [pin P5] - VCCQ [pin N4] - VDDF [pin K9] - VDDI [pin C2] - VSS [pin N2] - VSS [pin E7] - VSS [pin J5] - VSS [pin K8] - VSS [pin G5] - VSS [pin N5] - VSS [pin A6] - VSS [pin H10] - VSS [pin P6] - VSS [pin P4] - VSS [pin C4] ### MIC-1.8v — [MIC5225-1.8YM5-TR](https://www.flux.ai/adrian95/mic5225-1p8ym5-tr~90c.md) - Manufacturer Part Number: MIC5225-1.8YM5-TR - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Microchip Technology - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/mic5225.pdf - Part Type: Power Management **Pins:** - EN [pin 3] - GND [pin 2] - IN [pin 1] - NC/ADJ [pin 4] - OUT [pin 5] ### TXB0104D — [TXB0104D](https://www.flux.ai/jecstronic/txb0104d~k7b.md) - Manufacturer Part Number: TXB0104D - Manufacturer Name: Texas Instruments - Part Type: Level Shifters - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftxb0104 **Pins:** - A1 [pin 2] - A2 [pin 3] - A3 [pin 4] - A4 [pin 5] - B1 [pin 13] - B2 [pin 12] - B3 [pin 11] - B4 [pin 10] - GND [pin 7] - NC [pin 9] - NC [pin 6] - OE [pin 8] - VCCA [pin 1] - VCCB [pin 14] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/davetheman/esp32-emmc-module~8t](https://www.flux.ai/davetheman/esp32-emmc-module~8t).* --- *Generated from [https://www.flux.ai/davetheman/esp32-emmc-module~8t](https://www.flux.ai/davetheman/esp32-emmc-module~8t)*