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LAN8720A数据手册
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The LAN8720A/LAN8720Ai is a low-power 10BASE-T/100BASE-TX physical layer (PHY) transceiver with variable I/O voltage that is compliant with the IEEE 802.3-2005 standards. The LAN8720A/LAN8720Ai supports communication with an Ethernet MAC via a standard RMII interface. It contains a full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10Mbps (10BASE-T) and 100Mbps (100BASE-TX) operation. The LAN8720A/LAN8720Ai implements auto-negotiation to automatically determine the best possible speed and duplex mode of operation. HP Auto-MDIX support allows the use of direct connect or cross-over LAN cable
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2016 Microchip Technology Inc. DS00002165B-page 1
Highlights
• Single-Chip Ethernet Physical Layer Transceiver
(PHY)
• Comprehensive flexPWR
®
Technology
- Flexible Power Management Architecture
- LVCMOS Variable I/O voltage range: +1.6V
to +3.6V
- Integrated 1.2V regulator
• HP Auto-MDIX support
• Miniature 24-pin QFN/SQFN lead-free RoHS
compliant packages (4 x 4mm).
Target Applications
• Set-Top Boxes
• Networked Printers and Servers
• Test Instrumentation
• LAN on Motherboard
• Embedded Telecom Applications
• Video Record/Playback Systems
• Cable Modems/Routers
• DSL Modems/Routers
• Digital Video Recorders
• IP and Video Phones
• Wireless Access Points
• Digital Televisions
• Digital Media Adapters/Servers
• Gaming Consoles
• POE Applications (Refer to Application Note
17.18)
Key Benefits
• High-Performance 10/100 Ethernet Transceiver
- Compliant with IEEE802.3/802.3u (Fast
Ethernet)
- Compliant with ISO 802-3/IEEE 802.3
(10BASE-T)
- Loop-back modes
- Auto-negotiation
- Automatic polarity detection and correction
- Link status change wake-up detection
- Vendor specific register functions
- Supports the reduced pin count RMII inter-
face
• Power and I/Os
- Various low power modes
- Integrated power-on reset circuit
- Two status LED outputs
- Latch-Up Performance Exceeds 150mA per
EIA/JESD 78, Class II
- May be used with a single 3.3V supply
• Additional Features
- Ability to use a low cost 25Mhz crystal for
reduced BOM
• Packaging
- 24-pin QFN/SQFN (4x4 mm) Lead-Free
RoHS Compliant package with RMII
• Environmental
- Extended commercial temperature range
(0°C to +85°C)
- Industrial temperature range version avail-
able (-40°C to +85°C)
LAN8720A/LAN8720AI
Small Footprint RMII 10/100 Ethernet
Transceiver with HP Auto-MDIX Support
TO OUR VALUED CUSTOMERS
It is our intention to provide our valued customers with the best documentation possible to ensure successful use of your Microchip
products. To this end, we will continue to improve our publications to better suit your needs. Our publications will be refined and
enhanced as new volumes and updates are introduced.
If you have any questions or comments regarding this publication, please contact the Marketing Communication
s Department via
E-mail at docerrors@microchip.com. We welcome your feedback.
Most Current Data Sheet
To obtain the most up-to-date version of this data sheet, please register at our Worldwide Web site at:
http://www.microchip.com
You can determine the version of a data sheet by examining its
literature number found on the bottom outside corner of any page.
The last character of the literature number is the version number, (e.g., DS30000000A is version A of document DS30000000).
Errata
An errata sheet, describing minor operational differences from the data sheet and recommended workarounds, may exist for cur-
rent devices. As device/documentation issu
es become known to us, we will publish an errata sheet. The errata will specify the
revision of silicon and revision of document to which it applies.
To determine if an errata sheet exists for a pa
rticular device, please check with one of the following:
• Microchip’s Worldwide Web site; http://www.microchip.com
• Your local Microchip sales office (see last page)
When contacting a sales office, please specify wh
ich device, revision of silicon and data sheet (include -literature number) you are
using.
Customer Notification System
Register on our web site at www.microchip.com to receive the most current information on all of our products.
LAN8720A/LAN8720AI
DS00002165B-page 2 2016 Microchip Technology Inc.
2016 Microchip Technology Inc. DS00002165B-page 3
LAN8720A/LAN8720AI
Table of Contents
1.0 Introduction ..................................................................................................................................................................................... 4
2.0 Pin Description and Configuration .................................................................................................................................................. 6
3.0 Functional Description .................................................................................................................................................................. 14
4.0 Register Descriptions .................................................................................................................................................................... 41
5.0 Operational Characteristics ........................................................................................................................................................... 52
6.0 Package Information ..................................................................................................................................................................... 66
7.0 Application Notes .......................................................................................................................................................................... 71
Appendix A: Data Sheet Revision History ........................................................................................................................................... 73
The Microchip Web Site ...................................................................................................................................................................... 74
Customer Change Notification Service ............................................................................................................................................... 74
Customer Support ............................................................................................................................................................................... 74
Product Identification System ............................................................................................................................................................. 75
LAN8720A/LAN8720AI
DS00002165B-page 4 2016 Microchip Technology Inc.
1.0 INTRODUCTION
1.1 General Terms and Conventions
The following is list of the general terms used throughout this document:
BYTE 8-bits
FIFO First In First Out buffer; often used for elasticity buffer
MAC Media Access Controller
RMII™ Reduced Media Independent Interface
TM
N/A Not Applicable
X Indicates that a logic state is “don’t care” or undefined.
RESERVED Refers to a reserved bit field or address. Unless otherwise
no
ted, reserved bits must always be zero for write opera-
tions. Unless otherwise noted, values are not guaranteed
whe
n reading reserved bits. Unless otherwise noted, do
not read or write to reserved addresses.
SMI Serial Management Interface
1.2 General Description
The LAN8720A/LAN8720Ai is a low-power 10BASE-T/100BASE-TX physical layer (PHY) transceiver with variable I/O
voltage that is compliant with the IEEE 802.3-2005 standards.
The LAN8720A/LAN8720Ai supports communication with an Eth
ernet MAC via a standard RMII interface. It contains a
full-duplex 10-BASE-T/100BASE-TX transceiver and supports 10Mbps (10BASE-T) and 100Mbps (100BASE-TX) oper-
ation. The LAN8720A/LAN8720Ai implement
s auto-negotiation to automatically determine the best possible speed and
duplex mode of operation. HP Auto-MDIX support allows the use of direct connect or cross-over LAN cables.
The LAN8720A/LAN8720Ai support
s both IEEE 802.3-2005 compliant and vendor-specific register functions. However,
no register access is required for operation. The initial configuration may be selected via the configuration pins as
described in Section 3.7, "Configuration Straps," on page 29. Register-selectable configuration options may be used to
further define the functionality of the transceiver.
Per IEEE 802.3-2005 standards, all digital interface pins are tole
rant to 3.6V. The device can be configured to operate
on a single 3.3V supply utilizing an integrated 3.3V to 1.2V linear regulator. The linear regulator may be optionally dis-
abled, allowing usage of a high efficiency external regulator for lower system power dissipation.
The LAN8720A/LAN8720Ai is available in both extended comme
rcial and industrial temperature range versions. A typ-
ical system application is shown in Figure 1-1.
FIGURE 1-1: SYSTEM BLOCK DIAGRAM
LAN8720A/
LAN8720Ai
10/100
Ethernet
MAC
RMII
Mode LED
Transformer
Crystal or
Clock
Oscillator
MDI
RJ45
FIGURE 1-2: ARCHITECTURAL OVERVIEW
RMII Logic
Interrupt
Generator
LEDs
PLL
Receiver
DSP System:
Clock
Data Recovery
Equalizer
Squeltch
& Filters
Analog-to-
Digital
10M RX
Logic
100M RX
Logic
100M PLL
10M PLL
Transmitter
10M
Transmitter
100M
Transmitter
10M TX
Logic
100M TX
Logic
Central Bias
PHY Address
Latches
LAN8720A/LAN8720Ai
RBIAS
LED1
nINT
XTAL2
XTAL1/CLKIN
LED2
Management
Control
Mode Control
Reset Control
MDIX
Control
HP Auto-MDIX
RXP/RXN
TXP/TXN
TXD[0:1]
TXEN
RXD[0:1]
RXER
CRS_DV
MDC
MDIO
Auto-
Negotiation
RMIISEL
nRST
MODE[0:2]
SMI
PHYAD0
2016 Microchip Technology Inc. DS00002165B-page 5
LAN8720A/LAN8720AI
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资源评论
- LauraKuang2023-07-28该文件提供了清晰的引脚定义和引脚配置说明,帮助我准确地连接LAN8720A到我的电路板上。
- 乔木Leo2023-07-28这份数据手册提供了关于LAN8720A的详细技术规格,帮助我快速了解了该芯片的特性。
- 坐在地心看宇宙2023-07-28手册中附带的应用案例和常见问题解答为我在项目开发中遇到的困难提供了解决思路,节省了我大量的时间和精力。
- FloritaScarlett2023-07-28数据手册中的性能参数表和时序图清晰而直观,方便了我在设计中进行性能评估和时序分析。
- Friday永不为奴2023-07-28数据手册中的示例电路图和应用注意事项对于初学者来说非常有用,解决了我在使用LAN8720A时的一些疑惑。
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