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Original question:

DS90UB933-Q1: About the Problem of Power Sequence

DS90UB933-Q1: What happens if PDB reset time exceeds 16ms？

ni ni
Prodigy 60 points
Part Number: DS90UB933-Q1

Hi，The 933 PDB PIN connect a 10K pullup resistor and 10uF cap(RC) of my design,When power up,the t3 is about 136ms.

What happens if t3 exceeds 16ms？933 can't output video stream or can work sometimes it's good and sometimes it's bad？

Thank you！

  • 0
    TI__Expert 6395 points

    Hi,

    If t3 exceeds the maximum of 16ms, the following work-around must be implemented. It is also a part of the 933 datasheet, section 8.1.2, below table 8.1.

    * If timing constraint t3 cannot be assured, the following programming steps should be issued to the via local I2C control (not via remote back channel). These programming steps should be completed > 10ms after the power sequence is complete (VPDB > PDB VIH) with no delay between write commands. This step will cause a brief restart of the forward channel output:

    • Write Register 0x27 = 0x28

    • Write Register 0x27 = 0x20 

    • Write Register 0x27 = 0x00

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi,Our products have been ordered to the factory, and now there is a problem of flashing screen on the client side. I want to confirm whether it is caused by t3.so we want to know What happens if t3 exceeds 16ms？

    thanks

  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi,

    If the t3 exceeds 16ms, the device would have a non-deterministic startup. It is advised to follow the steps listed in my previous comment if t3 exceeds this value

    Regards,

    Vivaan 

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi，if t3 exceeds 16ms，ti933 would have a non-deterministic startup，Can I read the register of TI933 to see if it is normal？which register should I read if I can？

    We have confirmed that the previous image anomaly on the client has nothing to do with TI933.

    Thanks！

  • +1 in reply to ni ni
    TI__Expert 6395 points

    Hi, 

    As mentioned earlier, if t3 exceeds 16ms, you must follow the steps listed above for proper device functioning. If not followed, it would lead to a non-deterministic startup. It won't affect a single register, but the device as a whole

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi

    we have changed the cap 10uF to 0.33uF,and now the t3 is about 8.2ms,Please confirm if this modification is OK.

    Thanks!

  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi,

    What capacitor are you changing? TI recommends to follow the typical application diagram given in the datasheet. Any parts altered must be validated to meet channel specification and power requirements.

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi

    we change C18 from 10uF to 0.33uF.And we have test the t3 is meet requirements.

    Why did we choose 10uf in the first place？There is no requiment in DS90ub933's datasheet(version 2018) of t3.

    Why we don't use 1uF（Recommended）?we test t3 is 29ms in our circuit.

    Thanks！

  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi, 

    TI recommends to follow the typical application diagram. Please refer to the latest version of the datasheet for the most up-to-date information about TI devices. If t3 exceeds 16ms, the steps outlined in my previous comments can be used to ensure optimal performance. 

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi,

    In order to verify whether the t3 time exceeded will lead to anomalies, we did a stress test. 50pcs our products（t3=136ms）,Start once every 1 minute.After 5 days,one of them failed.Our Soc unable to access TI933 through IIC interface.but TI954 can access ti933 through BC.And ti933 did‘t output video stream.We test the ti933's voltage is normal.DVP signal of soc is normal.We download ti933&ti954 registers.

    PCLK is 91Mhz, 1920*720@30fps

    TI933 NG product registers

    Fullscreen TI933 NG product.log Download 
         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: b0 30 20 c5 80 14 60 00 00 00 06 00 17 90 35 00    ?0 ???`?..?.?U5.
10: 17 82 82 00 00 31 80 00 00 00 00 00 00 a0 fe 00    ???..1?......??.
20: 0e 1c 29 00 00 00 00 00 25 06 00 00 00 00 00 00    ??).....%?......
30: 00 00 00 00 00 05 00 00 00 00 00 00 00 00 00 00    ...???..........

    TI933 OK product registers

    Fullscreen TI933 OK product.log Download 
         0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f    0123456789abcdef
00: b0 30 20 c5 80 14 60 00 00 00 00 00 15 55 35 00    ?0 ???`?..?.?U5.
10: 17 82 82 00 00 31 80 00 00 00 00 00 00 a0 fe 00    ???..1?......??.
20: 0e 1c 29 00 00 00 00 00 25 06 00 00 00 00 00 00    ??).....%?......
30: 00 00 00 fe 80 01 00 00 00 00 00 00 00 00 00 00    ...???..........

    TI954 NG product registers

    Fullscreen 954 NG product.log Download 
    0x60,0x0,0x60,0x808
0x60,0x1,0x0,0x808
0x60,0x2,0x1e,0x808
0x60,0x3,0x20,0x808
0x60,0x4,0xd3,0x808
0x60,0x5,0x1,0x808
0x60,0x6,0x0,0x808
0x60,0x7,0xfe,0x808
0x60,0x8,0x1c,0x808
0x60,0x9,0x10,0x808
0x60,0xa,0x7a,0x808
0x60,0xb,0x7a,0x808
0x60,0xc,0x83,0x808
0x60,0xd,0x9,0x808
0x60,0xe,0x0,0x808
0x60,0xf,0x7f,0x808
0x60,0x10,0x0,0x808
0x60,0x11,0x0,0x808
0x60,0x12,0x0,0x808
0x60,0x13,0x0,0x808
0x60,0x14,0x0,0x808
0x60,0x15,0x0,0x808
0x60,0x16,0x0,0x808
0x60,0x17,0x0,0x808
0x60,0x18,0x0,0x808
0x60,0x19,0x0,0x808
0x60,0x1a,0x0,0x808
0x60,0x1b,0x0,0x808
0x60,0x1c,0x0,0x808
0x60,0x1d,0x0,0x808
0x60,0x1e,0x4,0x808
0x60,0x1f,0x2,0x808
0x60,0x20,0x0,0x808
0x60,0x21,0x1,0x808
0x60,0x22,0x0,0x808
0x60,0x23,0x0,0x808
0x60,0x24,0x0,0x808
0x60,0x25,0x0,0x808
0x60,0x26,0x0,0x808
0x60,0x27,0x0,0x808
0x60,0x28,0x0,0x808
0x60,0x29,0x0,0x808
0x60,0x2a,0x0,0x808
0x60,0x2b,0x0,0x808
0x60,0x2c,0x0,0x808
0x60,0x2d,0x0,0x808
0x60,0x2e,0x0,0x808
0x60,0x2f,0x0,0x808
0x60,0x30,0x0,0x808
0x60,0x31,0x0,0x808
0x60,0x32,0x0,0x808
0x60,0x33,0x1,0x808
0x60,0x34,0x40,0x808
0x60,0x35,0x0,0x808
0x60,0x36,0x0,0x808
0x60,0x37,0x3,0x808
0x60,0x38,0x0,0x808
0x60,0x39,0x0,0x808
0x60,0x3a,0x0,0x808
0x60,0x3b,0x1,0x808
0x60,0x3c,0x14,0x808
0x60,0x3d,0x6f,0x808
0x60,0x3e,0x0,0x808
0x60,0x3f,0x40,0x808
0x60,0x40,0x0,0x808
0x60,0x41,0xa7,0x808
0x60,0x42,0x71,0x808
0x60,0x43,0x1,0x808
0x60,0x44,0x0,0x808
0x60,0x45,0x0,0x808
0x60,0x46,0x0,0x808
0x60,0x47,0x0,0x808
0x60,0x48,0x0,0x808
0x60,0x49,0x0,0x808
0x60,0x4a,0x0,0x808
0x60,0x4b,0x12,0x808
0x60,0x4c,0x12,0x808
0x60,0x4d,0x53,0x808
0x60,0x4e,0xc,0x808
0x60,0x4f,0x19,0x808
0x60,0x50,0x3b,0x808
0x60,0x51,0x0,0x808
0x60,0x52,0x0,0x808
0x60,0x53,0x0,0x808
0x60,0x54,0x0,0x808
0x60,0x55,0x0,0x808
0x60,0x56,0x0,0x808
0x60,0x57,0x0,0x808
0x60,0x58,0x58,0x808
0x60,0x59,0x0,0x808
0x60,0x5a,0x0,0x808
0x60,0x5b,0xba,0x808
0x60,0x5c,0xb0,0x808
0x60,0x5d,0x0,0x808
0x60,0x5e,0x0,0x808
0x60,0x5f,0x0,0x808
0x60,0x60,0x0,0x808
0x60,0x61,0x0,0x808
0x60,0x62,0x0,0x808
0x60,0x63,0x0,0x808
0x60,0x64,0x0,0x808
0x60,0x65,0x0,0x808
0x60,0x66,0x0,0x808
0x60,0x67,0x0,0x808
0x60,0x68,0x0,0x808
0x60,0x69,0x0,0x808
0x60,0x6a,0x0,0x808
0x60,0x6b,0x0,0x808
0x60,0x6c,0x0,0x808
0x60,0x6d,0x7f,0x808
0x60,0x6e,0x88,0x808
0x60,0x6f,0x88,0x808
0x60,0x70,0x1e,0x808
0x60,0x71,0x6c,0x808
0x60,0x72,0xe4,0x808
0x60,0x73,0x0,0x808
0x60,0x74,0x0,0x808
0x60,0x75,0x0,0x808
0x60,0x76,0x0,0x808
0x60,0x77,0xc5,0x808
0x60,0x78,0x0,0x808
0x60,0x79,0x1,0x808
0x60,0x7a,0xf,0x808
0x60,0x7b,0xff,0x808
0x60,0x7c,0xc0,0x808
0x60,0x7d,0x0,0x808
0x60,0x7e,0x0,0x808
0x60,0x7f,0x0,0x808
0x60,0x80,0x0,0x808
0x60,0x81,0x0,0x808
0x60,0x82,0x0,0x808
0x60,0x83,0x0,0x808
0x60,0x84,0x0,0x808
0x60,0x85,0x0,0x808
0x60,0x86,0x0,0x808
0x60,0x87,0x0,0x808
0x60,0x88,0x0,0x808
0x60,0x89,0x0,0x808
0x60,0x8a,0x0,0x808
0x60,0x8b,0x0,0x808
0x60,0x8c,0x0,0x808
0x60,0x8d,0x0,0x808
0x60,0x8e,0x0,0x808
0x60,0x8f,0x0,0x808
0x60,0x90,0x0,0x808
0x60,0x91,0x0,0x808
0x60,0x92,0x0,0x808
0x60,0x93,0x0,0x808
0x60,0x94,0x0,0x808
0x60,0x95,0x0,0x808
0x60,0x96,0x0,0x808
0x60,0x97,0x0,0x808
0x60,0x98,0x0,0x808
0x60,0x99,0x0,0x808
0x60,0x9a,0x0,0x808
0x60,0x9b,0x0,0x808
0x60,0x9c,0x0,0x808
0x60,0x9d,0x0,0x808
0x60,0x9e,0x0,0x808
0x60,0x9f,0x0,0x808
0x60,0xa0,0x2,0x808
0x60,0xa1,0xf,0x808
0x60,0xa2,0x0,0x808
0x60,0xa3,0x0,0x808
0x60,0xa4,0x8,0x808
0x60,0xa5,0x18,0x808
0x60,0xa6,0x0,0x808
0x60,0xa7,0x0,0x808
0x60,0xa8,0x0,0x808
0x60,0xa9,0x0,0x808
0x60,0xaa,0x0,0x808
0x60,0xab,0x0,0x808
0x60,0xac,0x0,0x808
0x60,0xad,0x0,0x808
0x60,0xae,0x0,0x808
0x60,0xaf,0x0,0x808
0x60,0xb0,0x8,0x808
0x60,0xb1,0x14,0x808
0x60,0xb2,0x3f,0x808
0x60,0xb3,0x8,0x808
0x60,0xb4,0x25,0x808
0x60,0xb5,0x0,0x808
0x60,0xb6,0x18,0x808
0x60,0xb7,0x0,0x808
0x60,0xb8,0x8c,0x808
0x60,0xb9,0x33,0x808
0x60,0xba,0x83,0x808
0x60,0xbb,0x74,0x808
0x60,0xbc,0x80,0x808
0x60,0xbd,0x0,0x808
0x60,0xbe,0x0,0x808
0x60,0xbf,0x0,0x808
0x60,0xc0,0x0,0x808
0x60,0xc1,0x0,0x808
0x60,0xc2,0x0,0x808
0x60,0xc3,0x0,0x808
0x60,0xc4,0x0,0x808
0x60,0xc5,0x0,0x808
0x60,0xc6,0x0,0x808
0x60,0xc7,0x0,0x808
0x60,0xc8,0x0,0x808
0x60,0xc9,0x0,0x808
0x60,0xca,0x0,0x808
0x60,0xcb,0x0,0x808
0x60,0xcc,0x0,0x808
0x60,0xcd,0x0,0x808
0x60,0xce,0x0,0x808
0x60,0xcf,0x0,0x808
0x60,0xd0,0x0,0x808
0x60,0xd1,0x43,0x808
0x60,0xd2,0x94,0x808
0x60,0xd3,0x37,0x808
0x60,0xd4,0x60,0x808
0x60,0xd5,0xf2,0x808
0x60,0xd6,0x0,0x808
0x60,0xd7,0x0,0x808
0x60,0xd8,0x0,0x808
0x60,0xd9,0x0,0x808
0x60,0xda,0x0,0x808
0x60,0xdb,0x0,0x808
0x60,0xdc,0x0,0x808
0x60,0xdd,0x0,0x808
0x60,0xde,0x0,0x808
0x60,0xdf,0x0,0x808
0x60,0xe0,0x0,0x808
0x60,0xe1,0x0,0x808
0x60,0xe2,0x0,0x808
0x60,0xe3,0x0,0x808
0x60,0xe4,0x0,0x808
0x60,0xe5,0x0,0x808
0x60,0xe6,0x0,0x808
0x60,0xe7,0x0,0x808
0x60,0xe8,0x0,0x808
0x60,0xe9,0x0,0x808
0x60,0xea,0x0,0x808
0x60,0xeb,0x0,0x808
0x60,0xec,0x0,0x808
0x60,0xed,0x0,0x808
0x60,0xee,0x0,0x808
0x60,0xef,0x0,0x808
0x60,0xf0,0x5f,0x808
0x60,0xf1,0x55,0x808
0x60,0xf2,0x42,0x808
0x60,0xf3,0x39,0x808
0x60,0xf4,0x35,0x808
0x60,0xf5,0x34,0x808
0x60,0xf6,0x0,0x808
0x60,0xf7,0x0,0x808
0x60,0xf8,0x0,0x808
0x60,0xf9,0x0,0x808
0x60,0xfa,0x0,0x808
0x60,0xfb,0x0,0x808
0x60,0xfc,0x0,0x808
0x60,0xfd,0x0,0x808
0x60,0xfe,0x0,0x808
0x60,0xff,0x0,0x808

    TI954 OK product registers

    Fullscreen 954 ok product.log Download 
    0x60,0x0,0x60,0x808
0x60,0x1,0x0,0x808
0x60,0x2,0x1e,0x808
0x60,0x3,0x20,0x808
0x60,0x4,0xd3,0x808
0x60,0x5,0x1,0x808
0x60,0x6,0x0,0x808
0x60,0x7,0xfe,0x808
0x60,0x8,0x1c,0x808
0x60,0x9,0x10,0x808
0x60,0xa,0x7a,0x808
0x60,0xb,0x7a,0x808
0x60,0xc,0x83,0x808
0x60,0xd,0x9,0x808
0x60,0xe,0x0,0x808
0x60,0xf,0x7f,0x808
0x60,0x10,0x0,0x808
0x60,0x11,0x0,0x808
0x60,0x12,0x0,0x808
0x60,0x13,0x0,0x808
0x60,0x14,0x0,0x808
0x60,0x15,0x0,0x808
0x60,0x16,0x0,0x808
0x60,0x17,0x0,0x808
0x60,0x18,0x0,0x808
0x60,0x19,0x0,0x808
0x60,0x1a,0x0,0x808
0x60,0x1b,0x0,0x808
0x60,0x1c,0x0,0x808
0x60,0x1d,0x0,0x808
0x60,0x1e,0x4,0x808
0x60,0x1f,0x2,0x808
0x60,0x20,0x0,0x808
0x60,0x21,0x1,0x808
0x60,0x22,0x0,0x808
0x60,0x23,0x0,0x808
0x60,0x24,0x0,0x808
0x60,0x25,0x0,0x808
0x60,0x26,0x0,0x808
0x60,0x27,0x0,0x808
0x60,0x28,0x0,0x808
0x60,0x29,0x0,0x808
0x60,0x2a,0x0,0x808
0x60,0x2b,0x0,0x808
0x60,0x2c,0x0,0x808
0x60,0x2d,0x0,0x808
0x60,0x2e,0x0,0x808
0x60,0x2f,0x0,0x808
0x60,0x30,0x0,0x808
0x60,0x31,0x0,0x808
0x60,0x32,0x0,0x808
0x60,0x33,0x1,0x808
0x60,0x34,0x40,0x808
0x60,0x35,0x1,0x808
0x60,0x36,0x0,0x808
0x60,0x37,0x3,0x808
0x60,0x38,0x0,0x808
0x60,0x39,0x0,0x808
0x60,0x3a,0x0,0x808
0x60,0x3b,0x1,0x808
0x60,0x3c,0x14,0x808
0x60,0x3d,0x6f,0x808
0x60,0x3e,0x0,0x808
0x60,0x3f,0x40,0x808
0x60,0x40,0x0,0x808
0x60,0x41,0xa7,0x808
0x60,0x42,0x71,0x808
0x60,0x43,0x1,0x808
0x60,0x44,0x0,0x808
0x60,0x45,0x0,0x808
0x60,0x46,0x0,0x808
0x60,0x47,0x0,0x808
0x60,0x48,0x0,0x808
0x60,0x49,0x0,0x808
0x60,0x4a,0x0,0x808
0x60,0x4b,0x12,0x808
0x60,0x4c,0x12,0x808
0x60,0x4d,0x53,0x808
0x60,0x4e,0x4d,0x808
0x60,0x4f,0x2d,0x808
0x60,0x50,0x7f,0x808
0x60,0x51,0x0,0x808
0x60,0x52,0x0,0x808
0x60,0x53,0x0,0x808
0x60,0x54,0x0,0x808
0x60,0x55,0x0,0x808
0x60,0x56,0x0,0x808
0x60,0x57,0x0,0x808
0x60,0x58,0x58,0x808
0x60,0x59,0x0,0x808
0x60,0x5a,0x0,0x808
0x60,0x5b,0xb0,0x808
0x60,0x5c,0xb0,0x808
0x60,0x5d,0x0,0x808
0x60,0x5e,0x0,0x808
0x60,0x5f,0x0,0x808
0x60,0x60,0x0,0x808
0x60,0x61,0x0,0x808
0x60,0x62,0x0,0x808
0x60,0x63,0x0,0x808
0x60,0x64,0x0,0x808
0x60,0x65,0x0,0x808
0x60,0x66,0x0,0x808
0x60,0x67,0x0,0x808
0x60,0x68,0x0,0x808
0x60,0x69,0x0,0x808
0x60,0x6a,0x0,0x808
0x60,0x6b,0x0,0x808
0x60,0x6c,0x0,0x808
0x60,0x6d,0x7f,0x808
0x60,0x6e,0x88,0x808
0x60,0x6f,0x88,0x808
0x60,0x70,0x1e,0x808
0x60,0x71,0x6c,0x808
0x60,0x72,0xe4,0x808
0x60,0x73,0x2,0x808
0x60,0x74,0xd0,0x808
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  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi,

    As you mentioned, for this setup, the t3 time is 136ms

    ni ni said:
    （t3=136ms）

    When t3 exceeds 16ms, as given in the datasheet, the device will perform non-deterministically. In order to resolve this, you must take the steps I listed in my previous comments.

    Vivaan Jaiswal said:

    * If timing constraint t3 cannot be assured, the following programming steps should be issued to the via local I2C control (not via remote back channel). These programming steps should be completed > 10ms after the power sequence is complete (VPDB > PDB VIH) with no delay between write commands. This step will cause a brief restart of the forward channel output:

    • Write Register 0x27 = 0x28

    • Write Register 0x27 = 0x20 

    • Write Register 0x27 = 0x00

    Did you follow these steps for the your testing of the 50 units?

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi,

    We did not follow these steps for the our testing of the 50 units.Now that the faulty product is not powered off, what should we do next.

    thanks!

  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi, 

    As mentioned earlier, if t3 exceeds 16ms, the following steps must be followed to ensure proper functioning of the device. Since in your testing you did not follow the steps outlined above, the device will perform non-deterministically. I believe that is why one of them failed.

    Regards,

    Vivaan

  • 0 in reply to Vivaan Jaiswal
    Prodigy 60 points

    Hi，

    What evidence is there that t3 is directly responsible？We need definitive evidence.What can we do next.

    thanks!

  • 0 in reply to ni ni
    TI__Expert 6395 points

    Hi, As mentioned earlier, you did not follow the steps listed above, which can make the system behave non-deterministically. We cannot say with certainty what effect it would have for t3 to be more than 16ms. If you follow the steps I have outlined above, the system should work without errors.

    Regards,

    Vivaan