KSZ8851SNL アプリケーションノートとドライバー

KSZ8851SNLは、組み込みネットワークアプリケーション向けのSPIインターフェースEthernetコントローラです。アプリケーションノートには設計ガイドラインが記載されており、ドライバはMCUとの統合と通信を簡素化します。

ブランド: マイクロチップテクノロジー

ダウンロード： KSZ8851SNL データシート PDF

価格：問い合わせ

在庫あり： 21,568

プロトコル：イーサネット

関数：コントローラ

インタフェース： SPI

パッケージ： 32-VFQFN露出パッド

HK$250.00以上のご注文で送料無料

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ksz8851snl

The KSZ8851SNL is an Ethernet controller that makes it easy to connect microcontrollers to Ethernet networks. It supports both 10BASE-T and 100BASE-TX speeds, giving you flexibility for your network setup. It’s also power-efficient, with modes that save energy when not in use. Whether you’re using SPI or parallel communication, it offers great flexibility for integration. Plus, it supports common networking protocols like ARP, IP, and UDP. With its built-in DMA controller, the chip reduces the load on your CPU. It even supports Wake-on-LAN for remote power management. Perfect for embedded systems, IoT, and networking projects

ksz8851snl pinout diagram

ピン番号	ピン名	機能説明
1	VSS	Ground connection for the chip.
2	VDD	Power supply pin.
3	MDIO	Management Data Input/Output (used for PHY register access).
4	MDC	Management Data Clock (used with MDIO for PHY management).
5	RXD0	Receive Data bit 0 (Data input from Ethernet).
6	RXD1	Receive Data bit 1 (Data input from Ethernet).
7	RXD2	Receive Data bit 2 (Data input from Ethernet).
8	RXD3	Receive Data bit 3 (Data input from Ethernet).
9	CRS_DV	Carrier Sense/Receive Data Valid (used to indicate valid data reception).
10	TXD0	Transmit Data bit 0 (Data output to Ethernet).
11	TXD1	Transmit Data bit 1 (Data output to Ethernet).
12	TXD2	Transmit Data bit 2 (Data output to Ethernet).
13	TXD3	Transmit Data bit 3 (Data output to Ethernet).
14	TX_EN	Transmit Enable (used to signal when the transmitter is active).
15	RX_ER	Receive Error (indicates if there’s an error in received data).
16	RX_CLK	Receive Clock (provides clock for receiving data).
17	TX_CLK	Transmit Clock (provides clock for transmitting data).
18	INT	Interrupt output to the microcontroller.
19	リセット	Reset input for chip reset.
20	SCK	SPI Clock for communication with microcontroller.
21	味噌	SPI Master In Slave Out (data input to microcontroller).
22	モシ	SPI Master Out Slave In (data output from microcontroller).
23	CS	SPI Chip Select for communication with the chip.
24	RX_ER	Receive Error (indicates errors in incoming data).
25	TX_ER	Transmit Error (indicates errors in transmitted data).
26	nINT	Active-low Interrupt signal.
27	RST	Reset pin (active low to reset).
28	SLEEP	Low-power mode pin for chip’s sleep functionality.
29	VDD	Power supply pin.
30	VSS	Ground pin for chip operation.

When working with the KSZ8851SNL, here’s what to keep in mind: First, make sure the power (VDD) and ground (VSS) pins are securely connected to avoid voltage issues. If you’re using SPI, check that the SCK, MISO, MOSI, and CS pins match your microcontroller’s configuration. For network management, connect the MDIO and MDC pins to the external PHY as per the PHY’s specs. Don’t forget the interrupt pins (INT and nINT) to handle networking events, and ensure the RESET pin is set up correctly—sometimes, a pull-up resistor is needed.

ksz8851snl equivalent ethernet controller

Feature/Parameter	KSZ8851SNL	Wiznet W5500	Microchip LAN8720A
Ethernet Standard	10/100 Mbps (Fast Ethernet)	10/100 Mbps (Fast Ethernet)	10/100 Mbps (Fast Ethernet)
インタフェース	SPI、パラレル	SPI	RMII/SPI
電源	3.3V	3.3V	3.3V
物理	Integrated PHY	Integrated PHY	External PHY
動作温度	-40℃～+85℃	-40℃～+85℃	-40℃～+125℃
Integrated Features	Wake-on-LAN, DMA	TCP/IP offloading, SSL	Energy Efficient, low power
パッケージ	32-pin LQFP	32-pin LQFP	28-pin QFN
Interrupt Output	はい	はい	はい
Link Speed	10/100 Mbps	10/100 Mbps	10/100 Mbps

Here’s a quick comparison of alternatives to the KSZ8851SNL:

Wiznet W5500: This one adds TCP/IP offloading and SSL support, which is great for more advanced networking features. It’s compatible with SPI, so it’s a simple swap if your system uses SPI. However, it might not be as power-efficient as the KSZ8851SNL in certain cases.
Microchip LAN8720A: It uses RMII instead of SPI, so it’ll need some changes to your microcontroller’s interface. It’s perfect for low-power needs and works well in harsh environments due to its wider temperature range.

Switching to these alternatives? Make sure the interface matches your design.

ksz8851snl spi ethernet circuit example

This circuit is using the KSZ8851SNL for SPI-based Ethernet communication. Here’s a quick rundown of the key components:

KSZ8851SNL: Handles the Ethernet interface, with RX/TX pins for data transmission.
SPIインターフェース: It uses SPI for data communication, passing data through RXP1, RXM1, TXP1, and TXM1.
Resistors (R2, R6, R13, R15): Help with signal conditioning, ensuring proper current flow and impedance matching for SPI.
Capacitors (C13, C14, C15): These smooth out voltage fluctuations and reduce noise for stable communication.
Transformer (T1): Isolates the Ethernet signal and ensures proper voltage conversion.
3.3V Power Supply: Powers the circuit for stable operation.

This setup ensures smooth communication between your microcontroller and the Ethernet chip.

ksz8851snl linux driver setup

To set up the KSZ8851SNL on Linux, here’s the basic flow:

Install the Driver: The KSZ8851SNL works with the micrel driver. Check if it’s already supported by running dmesg | grep KSZ8851.
Enable the Driver: If not, enable it in your kernel config by navigating to Device Drivers -> Network device support -> Ethernet driver support and then compile the kernel.
Load the Driver: Use sudo modprobe micrel または sudo insmod ksz8851.ko to load the driver.
Check the Interface: Run ifconfig -a または ip a to see if the interface (usually eth0) is up.
Assign IP: Use sudo ifconfig eth0 up そして sudo dhclient eth0 to get an IP.
Verify: Test with ping 8.8.8.8 to ensure connectivity.

ksz8851snl arduino spi wiring

KSZ8851SNL Pin	Arduinoピン	説明
Pin 1 (VSS)	GND	Ground connection
Pin 2 (VDD)	3.3V	3.3V power supply
Pin 3 (SCK)	Pin 13 (SCK)	SPI Clock signal
Pin 4 (MISO)	Pin 12 (MISO)	SPI Master In Slave Out (MISO)
Pin 5 (MOSI)	Pin 11 (MOSI)	SPI Master Out Slave In (MOSI)
Pin 6 (CS)	Pin 10 (CS)	Chip Select (CS) for SPI
Pin 7 (INT)	Not connected	Interrupt pin (optional, used for events)
Pin 8 (RESET)	Pin 9 (RESET)	Reset pin (optional for manual reset)
Pin 9 (RXD0)	Not connected	RX data (Ethernet Receive)
Pin 10 (TXD0)	Not connected	TX data (Ethernet Transmit)

For connecting the KSZ8851SNL to your Arduino, here’s the breakdown:

VSS goes to GND.
VDD needs a 3.3V power supply (don’t use 5V, or you might damage the chip).
SCK connects to Pin 13 (SPI clock).
MISO connects to Pin 12 (for data reception).
MOSI connects to Pin 11 (for data transmission).
CS connects to Pin 10 (Chip Select).
INT and RESET are optional for advanced setups; you don’t need them for basic use.

Remember, you’ll need the right library like Ethernet2 to get the KSZ8851SNL working with Arduino. Just make sure your SPI pins are set up correctly in the code.

ksz8851snl mcu ethernet project

If you’re setting up an Ethernet project with the KSZ8851SNL and a microcontroller, you’ll be using the SPI interface for communication. First, connect the necessary pins: VSS to GND, VDD to 3.3V, and SPI pins like SCK, MISO, MOSI, and CS. Make sure you’re using 3.3V for power.

For Arduino, install the Ethernet2 library, and use the example code to connect to a web server. If you’re working with STM32 or another MCU, you’ll set up SPI using STM32CubeMX and use a TCP/IP stack like LWIP.

Once connected, you can test with a ping and check the Serial Monitor for feedback.