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TSER9615: V3 link STP

d_zero
Genius 4795 points
Part Number: TSER9615
Other Parts Discussed in Thread: TDES9640, , TSER953, TPD1E0B04, TPD1E01B04

Tool/software:

Dear Support,

we have a few question regarding using TSER9615 (  7.5G) and TSER953 ( 4G) connected to TDES9640 via STP ( no power over TP data)

TSER953

1a) When TSER953 connected via STP synchronous mode needs to use AC caps anything between 33nF to 100nF on P/N signal is that correct?

1b) Is there any drawback to use 100nF?

2a) When TSER953 connected via STP non- synchronous mode needs to use AC caps 100nF on P/N signal is that correct? 

2b) Only 100nF will work?

3a) V3 link (4G) output voltage is 1.21V, can you please propose unidirectional ESD diode for P and N signals to GND? TPD1E01B04 or TPD1E0B04 

3b) From your experience is it better to place the ESD diode between SER and AC caps or AC caps and cable?

3c) Do you recommend bidirectional ESD or unidirectional ESD between P and GND, N and GND?

3d) Do you recommend bidirectional ESD between P and N signal ?

4a) Do you have a selection guide for the CMC TSER953 ( 4G)? What a re the critical parameters?

 

5a) Do you have a selection for the STP cable and STP connector for TSER953 (4G)? What are the critical parameters?

TSER9615

6a) When TSER9615 connected via STP synchronous mode what AC caps are needed it is not stated in datasheet?

6b) Can TSER9615 working STP synchronous mode?

7a) When TSER9615 connected via STP non- synchronous mode needs to use AC caps 100nF on P/N signal is that correct? 

7b) Only 100nF will work?

8a) V3 link (7.5G) output voltage is 1.21V, can you please propose unidirectional ESD diode for P and N signals to GND? TPD1E01B04 or TPD1E0B04 

8b) From your experience is it better to place the ESD diode between SER and AC caps or AC caps and cable?

8c) Do you recommend bidirectional ESD or unidirectional ESD between P and GND, N and GND?

8d) Do you recommend bidirectional ESD between P and N signal ?

9a) Do you have a selection guide for the CMC TSER9615 ( 7.5G)? What a re the critical parameters?

 

10a) Do you have a selection for the STP cable and STP connector for TSER9615 (7.5G)? What are the critical parameters?

TSER9615 and TSER953

11) Regarding the line fault network , the RLF resistor should be on DESER side or on SER side? referring to SNLA322 has this resistor on DSER side (24k9) while the datasheet has it on SER side (10k)

12) please can you tell the STP line-fault network example from SNLA322 ( page39) is ok to use for when only data through STP no power ( power is separate)? for booth devices 

Applicable Thresholds • Normal Cable • Open Cable • "+" to "-" Short • "+" Short to Ground • "-" Short to Ground • Short to Battery

13) Only gpio0 and 1 can be used for this ? Because only this pins have ADC?

14) the network should be implemented after cable before the ESD/CMC and AC caps?

15a) the the EVB HSDC089B there are different values used for the network than SNLA322 , which one is correct? 

15b) on the SNLA322 the GPIO pins have some protection diodes to 1.1V while on the HSDC089B  this is missing, are the diodes required? We assume these are the protection didoes for GPIO

15c) the 1.1V we can use the VDD_1P1_D or VDD_1P1_DRV or VDD_1P1_PLL or external 1V1 rail?

15d) is the 1.1V because of the ADC on GPIO?

Best Regards,

d.

  • 0
    TI__Mastermind 28510 points

    Hello,

    1a) You must use the exact same capacitor on both the DOUT+ and DOUT- trace in STP. Max value is 100nF/100nF. Lowest value is 33nF/33nF. You need to use 100nF/100nF on the deserializer if you are connecting to a DVP serializer.

    b) This has been used in all systems, so no major frawback. Maybe the 100nF part might have more ESR/ESL than a 33nF part. But that depends on what specific P/N you choose.

    2a) Higher 100nF capacitors are necessary for lower BC speeds. Recommended to use 100nF when operating in DVP or Non-Synchronous mode, since the Back Channel speeds will be much lower in these operating modes.

    b) 100nF is recommended

    3a) TPD1E01B04 is suitable. You need a bidirectional diode with low capacitance for differential signals. Do not use a unidirectional diode.

    b) There is no significant impact on the system-level where you place the ESD diode.

    c) Bidirectional if you are protecting a differential signal.

    d) No, do not do that.

    4a) CMC on a the differential DOUT+/- traces are not required. They will also add loss on the high-speed channel. Recommendation is to not include. If you need to include, choose one with 100-Ohms differential impedance and minimal added Insertion Loss and Return Loss. And make sure it can handle up to 2.1 GHz signals.

    5a) Choose a cable and connector that is 100-Ohms differential impedance. Make sure they can handle up to 2.1GHz signals. Make sure they are shielded, if you want to pass EMI/EMC testing later. We typically use Rosenberger/TE Connectivity automotive connectors and automotive cables such as LEONI DACAR636.

    6a) TSER9615 is an NDA part. You need to request the full datasheet on the product page. The AC capacitors are typically the same as the 953, so use 100nF/100nF.

    b) Yes

    7a) Yes

    b) 100nF is recommended

    8a - 8d) See my responses for 3a - 3d.

    9a) See my response for 4a. But keep in mind the frequency is now 3.775 GHz.

    10a) See my response for 5a. But keep in mind the frequency is now 3.775 GHz.

    Regarding questions 11 - 15, these pertain to NDA doucmentation, so there is a limit on what I can say on a public forum.

    Do you have a local TI field apps or sales person that can help ask these questions over the internal e2e forum?

  • 0 in reply to Justin Phan
    TI__Mastermind 28510 points

    Rest of the questions were answered over email. Closing this thread, if there is no further support needed.