SNLA411 October   2022 DP83TC812R-Q1 , DP83TC812S-Q1 , DP83TC813R-Q1 , DP83TC813S-Q1

 

  1.   Abstract
  2.   Trademarks
  3. 1 Introduction
    1. 1.1 System Block Diagram
    2. 1.2 Terminology
  4. 2 TC10 Pin Descriptions
  5. 3 Primary Functions of the PHY
    1. 3.1 Transition from Sleep to Wake-up mode
      1. 3.1.1 Local Wake Detection
      2. 3.1.2 WUP Transmission and Reception
    2. 3.2 Wake Forwarding
    3. 3.3 Transition to Sleep - Sleep Negotiation
      1. 3.3.1 Sleep Ack
      2. 3.3.2 Sleep Request
      3. 3.3.3 Sleep Silent
      4. 3.3.4 Sleep Fail
      5. 3.3.5 Sleep
      6. 3.3.6 Normal State
      7. 3.3.7 Other Transitions
        1. 3.3.7.1 Forced Sleep
        2. 3.3.7.2 Activity during Sleep Negotiation
        3. 3.3.7.3 Link Down during Sleep Negotiation
        4. 3.3.7.4 Sleep Silent to Standby
  6. 4 Relevant Registers
  7. 5 Power Supply Recommendation
    1. 5.1 Core Supply Network Recommendation
    2. 5.2 Networks with Shared Core Supplies
  8. 6 Sequence of Events and Timing
    1. 6.1 Local Wake Timing
    2. 6.2 Remote Wake Timing
    3. 6.3 Successful Sleep Negotiation Timing
    4. 6.4 Sleep Abort Timing
    5. 6.5 WUR Timing
  9. 7 Ethernet Network Wake-up
  10. 8 Configuration for non-TC10 Applications
  11. 9 Additional Features
    1. 9.1 WUR Initiation Through WAKE Pin
    2. 9.2 Programmable Wake-Forward Pulse Width
  12. 10Conclusion

2 TC10 Pin Descriptions

The following pins are used by the DP83TC812/3 for TC10 functionality

Table 2-1 Pin Descriptions
Pin No. Name Type Function

7 (DP83TC812)

15 (DP83TC813)

 VSLEEP Supply 3.3 V power supply input derived from VBAT

8 (DP83TC812)

16 (DP83TC813)

 WAKE I/O

Bidirectional I/O pin used for

  • Local Wake Input
  • Wake Forwarding Output

10 (DP83TC812)

17 (DP83TC813)

 INH Output

Indication Output for Sleep Mode

  • High - Functional./Wake-up Mode
  • Hi-Z - Sleep Mode

VSLEEP

The VSLEEP pin needs a 3.3 V power supply input. The supply is derived from a low power LDO directly from VBAT (usually 12 V to 48 V). During sleep mode, to have the lowest power consumption, it is recommended that the VSLEEP is only supply which is on.

The following table shows the characteristics of this power supply pin.

Table 2-2 VSLEEP Supply Requirements
S.No. Parameter Description Units Min Typ Max
1 VSLEEP Voltage Supply voltage operation limits V 2.97 3.3 3.63
2 VSLEEP Ramp time Ramp time (0-100%) of the supply ms Refer to Data Sheet
3 Current consumption – Sleep mode Current consumption from VSLEEP in sleep mode (INH = 0) µA 7 18
4 Current consumption – Functional mode Current consumption from VSLEEP in functional mode (INH = 1) mA 4

The following image shows the recommended de-coupling network for the VSLEEP supply

Figure 2-1 VSLEEP Supply Network

WAKE

WAKE is a bidirectional input pin used for local wake as input and wake forwarding as output. This pin can be controlled by the MAC/controller for local wake. Open drain (high polarity) is recommended from the MAC/controller.

A pulse of width >40 μs on this pin wakes up the PHY. For wake-forwarding, the pin drives the pin high for some time and transitions back to input mode emulating open drain drive.

Since the pin uses open drain configuration, a strong external pull down resistance (10 kΩ) can be used.

The following table shows the requirements of the WAKE pin

Table 2-3 WAKE Requirements and Characteristics
S.No. Parameter Description Units Min Typ Max
1 VIH Minimum voltage beyond which the input buffer detects high V 2
2 VIL Minimum voltage below which the input buffer detects low V 0.8
3 R pull-down Pull-down resistance on the pin internal to the PHY kΩ 455
4 VOH Output high voltage (@ I = 2 mA) V 2.4

INH

INH is an open drain (high polarity) output pin which indicates whether the device is in sleep mode.

When the device is in sleep mode, the driver is turned off (Hi-Z). A pull down resistance external to the PHY can be used (10 kΩ recommended) which pulls down the INH pin down to 0 V.

When the device is out of sleep, INH transitions to high.

Table 2-4 INH Characteristics
S.No. Parameter Description Units Min Typ Max
1 VOH Output Voltage (@ I = 2 mA) V 2.4