Datasheet
Table Of Contents
- Small Footprint RMII 10/100 Ethernet Transceiver with HP Auto-MDIX Support
- 1.0 Introduction
- 2.0 Pin Description and Configuration
- 3.0 Functional Description
- 3.1 Transceiver
- 3.2 Auto-negotiation
- 3.3 HP Auto-MDIX Support
- 3.4 MAC Interface
- 3.5 Serial Management Interface (SMI)
- 3.6 Interrupt Management
- 3.7 Configuration Straps
- 3.8 Miscellaneous Functions
- 3.9 Application Diagrams
- 4.0 Register Descriptions
- 4.1 Register Nomenclature
- 4.2 Control and Status Registers
- TABLE 4-2: SMI Register Map
- 4.2.1 Basic Control Register
- 4.2.2 Basic Status Register
- 4.2.3 PHY Identifier 1 Register
- 4.2.4 PHY Identifier 2 Register
- 4.2.5 Auto Negotiation Advertisement Register
- 4.2.6 Auto Negotiation Link Partner Ability Register
- 4.2.7 Auto Negotiation Expansion Register
- 4.2.8 Mode Control/Status Register
- 4.2.9 Special Modes Register
- 4.2.10 Symbol Error Counter Register
- 4.2.11 Special Control/Status Indications Register
- 4.2.12 Interrupt Source Flag Register
- 4.2.13 Interrupt Mask Register
- 4.2.14 PHY Special Control/Status Register
- 5.0 Operational Characteristics
- 6.0 Package Information
- 7.0 Application Notes
- Appendix A: Data Sheet Revision History
- The Microchip Web Site
- Customer Change Notification Service
- Customer Support
- Product Identification System
- Worldwide Sales and Service
FIGURE 7-3: HIGH-LEVEL SYSTEM DIAGRAM FOR POWER
LAN8720
24-QFN
RBIAS
24
VSS
19
12k
VDD1A
nRST
15
C
BYPASS
1
C
BYPASS
VDD2A
VDDIO
C
BYPASS
C
F
VDDDIO
Supply
1.8 - 3.3V
Analog
Supply
3.3V
C
9
Power to
magnetics
interface.
R
VDDCR
6
1uF
LAN8720A/LAN8720AI
DS00002165B-page 72 2016 Microchip Technology Inc.
7.1.3 TWISTED-PAIR INTERFACE DIAGRAM
FIGURE 7-5: COPPER INTERFACE DIAGRAM
Magnetics
LAN8720
24-QFN
1
VDD2A
C
BYPASS
21
TXP
TXN
Analog
Supply
3.3V
1
2
3
4
5
6
7
8
20
1000 pF
3 kV
RJ45
75
75
23
RXP
RXN
22
C
BYPASS
19
VDD1A
C
BYPASS
49.9 Resistors
Magnetic
Supply
2.5 - 3.3V