原创 百佳泰正式取得USB Power Delivery EPR认证资格与USB PD重点更新

百佳泰于2023年6月9日获得USB-IF协会授权，正式取得USB Power Delivery EPR认证资格。相关认证要求的测试项目以及测试设备如下：

目前可取证的USB Power Delivery EPR产品种类尚有限制，USB-IF要求认证产品只能够有一个USB Type-C® port为EPR capable source port。以下两项目前无法取证的产品为例：

1. 产品上除了有EPR capable source port也有EPR capable sink port
2. 产品上除了有EPR capable source port也有SPR capable source port

除了上述限制外，另一点须留意的是：因为EPR的AVS为必需要支持的功能, 所以不允许不支持AVS的EPR capable source port取证。

最新USB-IF compliance updates如下：

㊀ Deprecation of EHCI Testing. USB2CV and EHCI IOP

㊁ Decrease to One Test Equipment Solution for SPR Products

注意事项：EX-350只支持Protocol相关测项, 故需要另外用其他设备补测Physical & Power相关测项

㊂ The USB-IF has recently confirmed that the RFI tests will not be applicable to hubs for the time being

注意事项：The temporary waiver can be granted by USB-IF until February, Y2024

㊃ FRS & USB4 should be run in the latest USB Power Delivery CTS for informational purpose

㊄ TEST.PD.PROT.ALL3.8 in the latest USB Power Delivery CTS

注意事项：
Respond with the correct revision: Pass
Respond with Not Supported: Temporary Waiver
Respond with nothing: Fail

㊅ COMMON.CHECK.PD.9 in the latest USB Power Delivery CTS

PD CTS update 详细信息：

PD Spec. update详细信息：

注意事项：The CTS will always be testing against the most current version of the base CTS. Any failures relating to previous versions will go through the waiver process

㊆ Define Vbus slew rate measurements in the latest USB Power Delivery CTS

详细信息：

◈ Affected Test item
➱ PD.PS.SRC.1 Multiple Request Load Test
➱ PD.PS.SRC.2 PDO Transitions
➱ PD.PS.SNK.3 Multiple Request Load Test Post PR Swap

◈ Vbus slew rate measurements (Appendix E)
➱ Turn all filtering and sample averaging off and work only with the raw signal samples
➱ Collect data samples with rate at least 20uS/Sample
➱ Start collecting signal samples after receiving Accept Message and before sending the last bit of GoodCRC Message. Record the Voltage Level as V1
➱ Stop collecting signal samples upon receiving PS_RDY Message. Record the Voltage Level as V2. –    Calculate the difference ΔV = |V2 – V1|
➱ If ΔV < 3.5V, the slew rate measurement could not be accurately calculated, and the measurement disregarded.
➱ Find the first sample that exceeds V1 + 0.1*ΔV for the Positive Transition (V2>V1) or getting below V2 + 0.9*ΔV + for the Negative Transitions (V2< V1) and corresponding sample number Sn_A from the last bit of GoodCRC– point A
➱ Find the first sample that exceeds V1 + 0.9* ΔV + for the Positive Transitions or getting below V2 + 0.1*ΔV + for the Negative Transitions and corresponding sample number Sn_B from the last bit of GoodCRC – point B
➱ Find SR = (Vpoint_B – Vpoint_A)/(Sn_B – Sn_A)*R

㊇ Remove the monotonicity requirement

详细信息：

• Affected Test item
  SPT.1 Load Test in USB Type-C and PD Source Power Requirements CTS
• If USB-IF QuadraMax reports the monotonicity issue, the vendors can ignore it and no waiver is required

㊈ Update to PPS Requirements

详细信息：

• Affected Test item
  SPT.6 PPS Voltage Step Test in USB Type-C and PD Source Power Requirements CTS
• If USB-IF QuadraMax reports the min voltage issue (3.3V), the vendors can request a wavier

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