DP83848KSQ/NOPB

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Description

The DP83848x device addresses the quality, reliability and small form factor required for space sensitive applications in embedded systems. The DP83848x offers performance far exceeding the IEEE specifications, with superior interoperability and industry leading performance beyond 137 meters of Cat-V cable. The DP83848x also offers Auto-MDIX to remove cabling complications. DP83848x has superior ESD protection, greater than 4 kV Human Body Model, providing extremely high reliability and robust operation, ensuring a high-level performance in all applications. DP83848J/K offers two flexible LED indicators one for Link and the other for Speed. In addition, both MII and RMII are supported ensuring ease and flexibility of design. The DP83848H/M/T incorporates a 25-MHz clock out that eliminates the need and hence the space and cost, of an additional clock source component. The DP83848x is offered in small 6-mm × 6-mm WQFN 40-pin package and is ideal for industrial controls, building/factory automation, transportation, test equipment and wire- less base stations.

Features

   1. Low-Power 3.3-V, 0.18-µm CMOS Technology

   2. Auto-MDIX for 10/100 Mb/s

   3. Energy Detection Mode

   4. 3.3-V MAC Interface

   5. RMII Rev. 1.2 Interface (configurable)

   6. MII Interface

   7. MII Serial Management Interface (MDC and MDIO)

   8. IEEE 802.3 Auto-Negotiation and Parallel Detection

   9. IEEE 802.3 ENDEC, 10BASE-T Transceivers and Filters

 10. IEEE 802.3 PCS, 100BASE-TX Transceivers and Filters

 11. Integrated ANSI X3.263 Compliant TP-PMD Physical Sub-Layer with Adaptive Equalization and Baseline Wander Compensation

 12. Error-Free Operation Beyond 137 Meters

 13. ESD Protection – Greater than 4 kV Human Body Model

 14. Configurable LED for Link and Activity (DP83848J/K)

 15. 25-MHz Clock Output (DP83848H/M/T)

 16. Single Register Access for Complete PHY Status

 17. 10/100 Mb/s Packet BIST (Built-in Self Test)

Applications

   1. Peripheral Devices

   2. Mobile Devices

   3. Factory and Building Automation

   4. Base Stations

Pin Highlights

Typical Application Block Diagram

  ┌───────────────┐

  │          MCU/MPU                      │

  └──────┬───────┬──┘

                    │                 │

    ┌─────▼─────┐  │

    │ RMIIInterface     │  │

    │ (50MHz)              │  │

    └─────┬─────┘   │

                   │                  │

    ┌─────▼───────▼──┐

    │  DP83848KSQ                   │

    │   PHYChip                        ├──▶ Transformer → RJ45

    └─────┬───────┬──┘

                    │                 │

  ┌──────▼───────▼──┐

  │ 25MHz crystal                         │

  │ (±50ppm)                        │

  └─────────────────┘

Design points

   1. Transformer selection:

       - HX1188NL and other gigabit transformers are recommended

       - The center tap needs to be connected to a 0.1μF capacitor to ground

   2. PCB layout:

       - Differential pair trace lengths match ±5mm

       - Avoid parallel traces with high-frequency signals

   3. ESD protection:

       - It is recommended to add SRV05-4 TVS tube at the RJ45 interface

Register configuration

   // Typical initialization sequence

   PHY_Write(0x00, 0x2100); // Soft reset

   PHY_Write(0x10, 0x01E1); // Advertise 100M full-duplex capability

   PHY_Write(0x00, 0x1200); // Enable auto-negotiation

Development resources

   1. Evaluation board: DP83848EVM

   2. Design tools:

       - TI PHYTER configuration tool

       - Altium design library provided

   3. Driver support:

       - Linux kernel native driver

       - RT-Thread BSP package

Application scenarios

   1. Industrial communication:

       - PROFINET slave device

       - EtherCAT IO module

   2. Embedded system:

       - Industrial HMI human-machine interface

       - Smart gateway

   3. Energy management:

       - PV inverter communication interface

       - Smart meter concentrator

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