• State Resolved
  • Locked Locked
  • Replies 14 replies
  • Subscribers 32 subscribers
  • Views 613 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

TUSB216:TUSB216

shirakawa-keigo
Prodigy 20 points
Part Number: TUSB216
Other Parts Discussed in Thread: TUSB215,

ドライブレコーダーの設計開発でTUSB216PWBRを使用しております。
使用方法は、USB2.0のデータ信号(D+/D-)を周辺機器にケーブルで接続しており、ケーブルの全長はケーブル①4m＋ケーブル②4m＝合計8mです。5m以上(USB2.0規格保証外)になり信号劣化が懸念されるため、ケーブル①と②の間の電気回路にTUSB216PWBRを入れて信号補正を目的としてます。
USB2.0のデータ信号で具体的に送受信しているのは、LTE通信に関わるコマンドや通信データです。
TUSB216PWBRの電気回路と、機器の接続図の資料を添付しましたのでご確認ください。

現在、上記の使用方法でLTE通信の送信時に通信不良が発生しており解析中です。
そこで幾つか質問があります。
(1)TUSB216PWBRのデータシートより、ケーブル長は追加5m「5m(USB2.0規格)＋追加5m＝合計10m」まで信号補正(※)できる認識ですが正しいでしょうか？
　(※)USB2.0のデータ信号(D+/D-)の信号品質がUSB2.0コンプライアンス試験に合格する

(2)上記の通り、弊社のケーブルの全長はケーブル①4m＋ケーブル②4m＝合計8mです。
　ケーブル①とケーブル②の間にTUSB216PWBRを入れてますが、使用方法は間違っておりませんか？

(3)ケーブル②のケーブル長を3m未満にすると通信不良が無くなります。「ケーブル①4m＋ケーブル②3m＝合計7m」
　この結果についてご見解を頂けませんか？

(4)TUSB216PWBRのデータシートを見ながら回路設計しましたが、電気回路は問題っておりませんか？
　抵抗やコンデンサの部品定数など含めてご見解ありましたらお願い致します。

(5)BOOSTはレベル0～3の4段階、RX_SENはH/M/Lの3段階により信号補正を調整できます。弊社はBOOST=レベル0、RX_SEN=Hで使用しております。
　このBOOST、RX_SENの組合せを変更する事で今回の通信不良が解消する見込みはあるでしょうか？
　TUSB216RWBRに関する電気回路、機器の接続図.pdf

  • 0
    Prodigy 20 points

    文字化けしておりましたので再送します。

    ドライブレコーダーの設計開発でTUSB216RWBRを使用しております。
    使用方法は、USB2.0のデータ信号(D+/D-)を周辺機器にケーブルで接続しており、ケーブルの全長はケーブル(1)4m+ケーブル(2)4m=合計8mです。全長が5m以上(USB2.0規格保証外)になり信号劣化が懸念されるため、ケーブル(1)と(2)の間の電気回路にTUSB216RWBRを入れて信号補正を目的としてます。
    USB2.0のデータ信号で具体的に送受信しているのは、LTE通信に関わるコマンドや通信データです
    TUSB216RWBRの電気回路と、機器の接続図の資料を添付しましたのでご確認ください。

    現在、上記の使用方法でLTE通信の送信時に通信不良が発生しており解析中です。
    そこで幾つか質問があります。
    (1)TUSB216PWBRのデータシートより、ケーブル長は追加5m「5m(USB2.0規格)+追加5m=合計10m」まで信号補正(※)できる認識ですが正しいでしょうか?
    (※)USB2.0のデータ信号(D+/D-)の信号品質がUSB2.0コンプライアンス試験に合格する

    (2)上記の通り、弊社のケーブルの全長はケーブル(1)4m+ケーブル(2)4m=合計8mです。
    ケーブル(1)とケーブル(2)の間にTUSB216RWBRを入れてますが、使用方法は間違っておりませんか?

    (3)ケーブル(2)のケーブル長を3m未満にすると通信不良が無くなります。「ケーブル(1)4m+ケーブル(2)3m=合計7m」
    この結果についてご見解を頂けませんか?

    (4)TUSB216RWBRのデータシートを見ながら回路設計しましたが、電気回路は問題っておりませんか?
    抵抗やコンデンサの部品定数など含めてご見解ありましたらお願い致します。

    (5)BOOSTはレベル0~3の4段階、RX_SENはH/M/Lの3段階により信号補正を調整できます。弊社はBOOST=レベル0、RX_SEN=Hで使用しております。
    このBOOST、RX_SENの組合せを変更する事で今回の通信不良が解消する見込みはあるでしょうか?

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    I would appreciate it if you could ask your question again in English.

    Best,

    Josh

  • 0 in reply to Josh Baik
    Prodigy 20 points

    I filled it out in English. Please confirm.

    I am using TUSB216RWBR in the design and development of drive recorders.
    The method of use is to connect the USB 2.0 data signal (D+/D-) to the peripheral device with a cable, and the total length of the cable is cable (1) 4m + cable (2) 4m = 8m in total. Since the total length is 5m or more (out of the USB 2.0 standard guarantee) and there is concern about signal deterioration, the purpose is to correct the signal by inserting the TUSB216RWBR in the electric circuit between the cables (1) and (2).
    Specifically, commands and communication data related to LTE communication are sent and received with USB 2.0 data signals.
    Please check the attached materials for the electrical circuit of the TUSB216RWBR and the connection diagram of the device.

    Currently, there is a communication failure when sending LTE communication with the above usage, and it is under analysis.
    I have a few questions there.
    (1) From the data sheet of TUSB216PWBR, the signal correction (*) is possible up to an additional 5m cable length "5m (USB 2.0 standard) + additional 5m = total 10m", but is it correct?
    (*) The signal quality of the USB2.0 data signal (D+/D-) passes the USB2.0 compliance test.

    (2) As mentioned above, the total length of our cable is cable (1) 4m + cable (2) 4m = total 8m.
    The TUSB216RWBR is inserted between the cable (1) and cable (2), but is it used correctly?

    (3) If the cable length of cable (2) is set to less than 3m, communication failure will be eliminated.
    "Cable (1) 4m + Cable (2) 3m or less = Total 7m or less"
    Please give us your opinion on this result.

    (4)I designed the circuit while referring to the data sheet of TUSB216RWBR.Is there any problem with the electric circuit?
    If you have any opinions, including the component constants of resistors and capacitors, please let me know.

    (5) BOOST can adjust signal correction in 4 levels from level 0 to 3, and RX_SEN in 3 levels of H/M/L. We use BOOST=level 0 and RX_SEN=H.
    Is there any chance that this communication failure will be resolved by changing the combination of BOOST and RX_SEN?
    Please give us your opinion.

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    1. Do you know the wire gauge? Please refer to the below table for the maximum pre-channel loss to pass and the maximum post-channel loss to pass. Since TUSB215 can support a maximum 8m with HIGH DC boost on the table, I think TUSB216 will also support an 8m cable length with HIGH DC boost.
    2. It might be failed because your post-channel cable length is 4m as the max post-channel is 3 meters 28AWG even HIGH DC boost.
    3. This result brings to match the table on max pre-channel and post-channel with HIGH DC boost.
    4. Since you have a different net name for DP and DN, please double-check that it is connected D1P to D2P and D1N to D2N.
    5. It would be recommended to set the redriver to the lowest setting to start. Also, I was wondering if you could potentially switch to the TUSB216I, as it is an updated device of the TUSB216 with P2P compatibility and could boost performance even more.

    Best,

    Josh

  • 0 in reply to Josh Baik
    Prodigy 20 points

    Hi Josh-San,

    Thank you for your answer.

    The answers 1 and 2 are different, so I have a question.

    1.・・・ I think TUSB216 will also support an 8m cable length with HIGH DC boost.
    2.    It might be failed because your post-channel cable length is 4m as the max post-channel is 3 meters 28AWG even HIGH DC boost.

    I'm asking "post channel cable: 4m" + "pre-channel cable: 4m" = total 8m supported?

    Best,

    Shirakawa

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    TUSB216 supports 8m cable length at HIGH DC Boost as the table above, but maximum post-channel is 3m 28AWG. If the post-channel is longer than 3m, it doesn't support the compensation. It is matched your test status between 4m cable and 3m cable of post-channel.

    4m pre-channel + 4m post-channel = 8m -> Failed

    4m pre-channel + 3m post-channel = 7m -> Passed

    5m pre-channel + 3m post-channel = 8m -> Passed

    To clarify, the cable length must be less than 5m 28AWG of pre-channel and 3m 28AWG of post-channel at HIGH DC Boost. If one of channel is longer, the compensation would not be provided.

    Best,

    Josh

  • 0 in reply to Josh Baik
    Prodigy 20 points

    Hi Josh-San,

    Thank you for your answer.

    ①EQ Settings
    ②DC Boost Settings
    If ①=0, ②=HIGH, does it support "4m pre-channel + 3m post-channel"?

    Best,

    Shirakaw

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    As the table above, it supports 5m pre-channel + 3m post-channel at HIGH EQ and DC Boost that are maximized setting from the device. Due to the nature of our USB 2 redriver solution, there is no specific compensation for insertion loss (in dB) that accurately corresponds to a particular boost setting of the device. It is recommended that you start testing the redriver with the lowest setting with the desired cable length for the pre-channel and post-channel.

    Best,

    Josh

  • 0 in reply to Josh Baik
    Prodigy 20 points

    Hi Josh-San,

    Thank you for your answer.

    Use device settings with HIGH EQ and DC Boost at maximum.

    Best,

    Shirakawa

  • 0 in reply to shirakawa-keigo
    Prodigy 20 points

    Hi Josh-San,

    Please tell me about the HIGH EQ setting of the TUSB216RWBR.
    In order to set HIGH when the power supply voltage is 3.0V, according to the data sheet (P16, Table 8-3), should I set RRXSEN1=37.5kΩ and RRXSEN2=12.5kΩ?

    *TUSB216 USB 2.0 High-Speed Signal Conditioner With BC 1.2 Controller datasheet (Rev. C)

    Best,

    Shirakawa

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    The design parameters should be considered depending on the design power supply. Table 8-3 is for 2.3V to 4.3V Vbat. If you are looking for 3.3 supply +/- 10%, please refer to Table 8-2.

    Best,

    Josh

  • 0 in reply to Josh Baik
    Prodigy 20 points

    Hi Josh-San,

    Thank you for your answer.

    If the RX_SEN input voltage is intermediate potential (*), will the HIGH EQ level be Medium?
    (*) Vil (0.75V) < RX_SEN input voltage < Vih (VCC x 75%)

    Best,

    Shirakawa

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    I will get back you with the feedback on Monday. Thank you for the understanding. 

    Best,

    Josh

  • 0 in reply to shirakawa-keigo
    TI__Mastermind 22946 points

    Hi Shirakawa-San,

    Thank you for the patience. What is the desired Vcc? Please refer to Input RX_SEN in Electrical Characteristics of the datasheet as below. Note that low level input voltage is 0.75V and high level input voltage is 75% minimum and 5.5V maximum. A high level of setup is possible if the desired high level of input voltage is in the range, but the compliance should be tested because due to the nature of the USB2 redriver solution, there is no specific compensation (dB) for insertion loss exactly corresponding to the device's specific boost setting.

    Best,

    Josh