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

5.1 Core Supply Network Recommendation

DP83TC812/3 doesn’t have any restrictions with respect to supply sequencing of VSLEEP, VDDA, VDDIO/VDDMAC. The sleep functionality in the PHY will be active immediately after the VLSEEP supply ramp is complete. The core functionality of the PHY will be active 10 ms after the last core power supply ramp is complete or after the device transitions from sleep to functional state whichever happens later.

In a system which needs the lowest current consumption in sleep mode, it is recommended to cut off the core supplies.

The image below shows some of the configurations of supply networks.

Figure 5-1 Core Supply Networks

The PHY doesn’t malfunction even if the supplies are not cutoff. But, the current consumption of the PHY from the core supplies will be high. The table below shows the current comparison in sleep mode when supplies are cut off and when the supplies are intact.

Table 5-1 Current Consumption Comparison
S.No Supply Units Current Consumption (Max)
Supplies Cut-off Supplies Intact
1 VSLEEP mA 0.018 0.018
2 VDDA mA 0 50
3 VDDIO/VDDMAC (3.3 V) mA 0 23
4 Total Current mA 0.018 73
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