SNLA389F October   2022  – August 2025 DP83TC812R-Q1 , DP83TC812S-Q1 , DP83TC813R-Q1 , DP83TC813S-Q1 , DP83TC814R-Q1 , DP83TC814S-Q1

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Hardware Configuration
    1. 2.1 Schematic
  6. 3Software Configuration
  7. 4Testing PMA
    1. 4.1 PMA Testing Procedure
  8. 5Testing IOP: Link-up and Link-down
    1. 5.1 IOP Testing Procedure
  9. 6Testing SQI
    1. 6.1 SQI Value Interpretation
  10. 7Testing TDR
    1. 7.1 TDR Testing Procedure
  11. 8Testing EMC and EMI
  12. 9Revision History

2.1 Schematic

Schematics and the right components for MDI, reference clock, and power network are critical for the performance of 100Base-T1 PHY. This section captures the recommended schematics and component values used during OA TC-1 testing.

Power Supply Network: For Applications With Sleep Mode Requirement (DP83TC812)Figure 2-1 Power Supply Network: For Applications With Sleep Mode Requirement (DP83TC812)
Power Supply Network: For Applications With Sleep Mode Requirement (DP83TC813)Figure 2-2 Power Supply Network: For Applications With Sleep Mode Requirement (DP83TC813)
Power Supply Network: For Applications Without Sleep Mode Requirement (DP83TC812 and DP83TC814)Figure 2-3 Power Supply Network: For Applications Without Sleep Mode Requirement (DP83TC812 and DP83TC814)
Power Supply Network: For Applications Without Sleep Mode Requirement (DP83TC813)Figure 2-4 Power Supply Network: For Applications Without Sleep Mode Requirement (DP83TC813)
MDI and Crystal SchematicFigure 2-5 MDI and Crystal Schematic
Table 2-1 Parameters, Components, and Values
Parameter | ComponentValue
VDDIO | VDDMAC1.8V, 2.5V, or 3.3V
De-Coupling Capacitors VDDIO10nF
De-Coupling Capacitors VDDMAC10nF, 470nF
Combined Ferrite Bead for VDDIO | VDDMAC1BLM18KG601SH1
VDDA3.3V
De-Coupling Capacitors VDDA10nF, 470nF
(Optional): Ferrite Bead for VDDABLM18KG601SH1
Vsleep3.3V
De-Coupling Capacitors Vsleep0.1μF
DC Blocking Capacitors (1% accurate, 100V)0.1μF
Common-Mode Choke

DLW43MH201XK2L, DLW32MH201XK2, AE2002, ACT1210L-201

Common-Mode Termination Resistors (1% accurate, 0.75 W, Size: 2010)1 kΩ
MDI Coupling Capacitor4.7nF
ESD Shunt (5% accurate, 0.125 W, Size: 0805100 kΩ
Isolation Resistor 1 (0.25 W, Size: 1206)0 Ω
Isolation Resistor 2 (0.25 W, Size: 1206)0 Ω
Isolation CapacitorNot populated
R_XI100 Ω
R_XOMinimum required for crystal wattage specification
ESDCONN (Optional)ESD devices qualified by Open Alliance 100BASE-T1 EMC Test Specification for ESD suppression devices with clamping voltage >100V and load capacitance < 5 pF.

PESD1ETH1GLS-Q, for example.

ESDPHY (Optional)

PESD2ETHX-Q. Connect VCC pin to 3.3V rail. This adds protection if ethernet cable is shorted to battery, and from other transients <100V.

(1) If VDDIO is separate from VDDMAC, then additional ferrite bead and a 0.47-μF capacitor are required on VDDIO. This ferrite bead has the same component number: BLM18KG601SH1.