SNLS605C July   2018  – April 2024 DS90UB935-Q1

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Recommended Timing for the Serial Control Bus
    7. 5.7 Timing Diagrams
    8. 5.8 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagram
    3. 6.3 Feature Description
      1. 6.3.1 CSI-2 Receiver
        1. 6.3.1.1 CSI-2 Receiver Operating Modes
        2. 6.3.1.2 CSI-2 Receiver High-Speed Mode
        3. 6.3.1.3 CSI-2 Protocol Layer
        4. 6.3.1.4 CSI-2 Short Packet
        5. 6.3.1.5 CSI-2 Long Packet
        6. 6.3.1.6 CSI-2 Errors and Detection
          1. 6.3.1.6.1 CSI-2 ECC Detection and Correction
          2. 6.3.1.6.2 CSI-2 Check Sum Detection
          3. 6.3.1.6.3 D-PHY Error Detection
          4. 6.3.1.6.4 CSI-2 Receiver Status
      2. 6.3.2 FPD-Link III Forward Channel Transmitter
        1. 6.3.2.1 Frame Format
      3. 6.3.3 FPD-Link III Back Channel Receiver
      4. 6.3.4 Serializer Status and Monitoring
        1. 6.3.4.1 Forward Channel Diagnostics
        2. 6.3.4.2 Back Channel Diagnostics
        3. 6.3.4.3 Voltage and Temperature Sensing
          1. 6.3.4.3.1 Programming Example
        4. 6.3.4.4 Built-In Self Test
      5. 6.3.5 FrameSync Operation
        1. 6.3.5.1 External FrameSync
        2. 6.3.5.2 Internally Generated FrameSync
      6. 6.3.6 GPIO Support
        1. 6.3.6.1 GPIO Status
        2. 6.3.6.2 GPIO Input Control
        3. 6.3.6.3 GPIO Output Control
        4. 6.3.6.4 Forward Channel GPIO
        5. 6.3.6.5 Back Channel GPIO
    4. 6.4 Device Functional Modes
      1. 6.4.1 Clocking Modes
        1. 6.4.1.1 Synchronous Mode
        2. 6.4.1.2 Non-Synchronous Clock Mode
        3. 6.4.1.3 Non-Synchronous Internal Mode
        4. 6.4.1.4 DVP Backwards Compatibility Mode
        5. 6.4.1.5 Configuring CLK_OUT
      2. 6.4.2 MODE
    5. 6.5 Programming
      1. 6.5.1 I2C Interface Configuration
        1. 6.5.1.1 CLK_OUT/IDX
          1. 6.5.1.1.1 IDX
      2. 6.5.2 I2C Interface Operation
      3. 6.5.3 I2C Timing
    6. 6.6 Pattern Generation
      1. 6.6.1 Reference Color Bar Pattern
      2. 6.6.2 Fixed Color Patterns
      3. 6.6.3 Packet Generator Programming
        1. 6.6.3.1 Determining Color Bar Size
      4. 6.6.4 Code Example for Pattern Generator
    7. 6.7 Register Maps
      1. 6.7.1 Main Registers
        1. 6.7.1.1  I2C Device ID Register
        2. 6.7.1.2  Reset
        3. 6.7.1.3  General Configuration
        4. 6.7.1.4  Forward Channel Mode Selection
        5. 6.7.1.5  BC_MODE_SELECT
        6. 6.7.1.6  PLL Clock Control
        7. 6.7.1.7  Clock Output Control 0
        8. 6.7.1.8  Clock Output Control 1
        9. 6.7.1.9  Back Channel Watchdog Control
        10. 6.7.1.10 I2C Control 1
        11. 6.7.1.11 I2C Control 2
        12. 6.7.1.12 SCL High Time
        13. 6.7.1.13 SCL Low Time
        14. 6.7.1.14 Local GPIO DATA
        15. 6.7.1.15 GPIO Input Control
        16. 6.7.1.16 DVP_CFG
        17. 6.7.1.17 DVP_DT
        18. 6.7.1.18 Force BIST Error
        19. 6.7.1.19 Remote BIST Control
        20. 6.7.1.20 Sensor Voltage Gain
        21. 6.7.1.21 Sensor Control 0
        22. 6.7.1.22 Sensor Control 1
        23. 6.7.1.23 Voltage Sensor 0 Thresholds
        24. 6.7.1.24 Voltage Sensor 1 Thresholds
        25. 6.7.1.25 Temperature Sensor Thresholds
        26. 6.7.1.26 CSI-2 Alarm Enable
        27. 6.7.1.27 Alarm Sense Enable
        28. 6.7.1.28 Back Channel Alarm Enable
        29. 6.7.1.29 CSI-2 Polarity Select
        30. 6.7.1.30 CSI-2 LP Mode Polarity
        31. 6.7.1.31 CSI-2 High-Speed RX Enable
        32. 6.7.1.32 CSI-2 Low Power Enable
        33. 6.7.1.33 CSI-2 Termination Enable
        34. 6.7.1.34 CSI-2 Packet Header Control
        35. 6.7.1.35 Back Channel Configuration
        36. 6.7.1.36 Datapath Control 1
        37. 6.7.1.37 Remote Partner Capabilities 1
        38. 6.7.1.38 Partner Deserializer ID
        39. 6.7.1.39 Target 0 ID
        40. 6.7.1.40 Target 1 ID
        41. 6.7.1.41 Target 2 ID
        42. 6.7.1.42 Target 3 ID
        43. 6.7.1.43 Target 4 ID
        44. 6.7.1.44 Target 5 ID
        45. 6.7.1.45 Target 6 ID
        46. 6.7.1.46 Target 7 ID
        47. 6.7.1.47 Target 0 Alias
        48. 6.7.1.48 Target 1 Alias
        49. 6.7.1.49 Target 2 Alias
        50. 6.7.1.50 Target 3 Alias
        51. 6.7.1.51 Target 4 Alias
        52. 6.7.1.52 Target 5 Alias
        53. 6.7.1.53 Target 6 Alias
        54. 6.7.1.54 Target 7 Alias
        55. 6.7.1.55 Back Channel Control
        56. 6.7.1.56 Revision ID
        57. 6.7.1.57 Device Status
        58. 6.7.1.58 General Status
        59. 6.7.1.59 GPIO Pin Status
        60. 6.7.1.60 BIST Error Count
        61. 6.7.1.61 CRC Error Count 1
        62. 6.7.1.62 CRC Error Count 2
        63. 6.7.1.63 Sensor Status
        64. 6.7.1.64 Sensor V0
        65. 6.7.1.65 Sensor V1
        66. 6.7.1.66 Sensor T
        67. 6.7.1.67 CSI-2 Error Count
        68. 6.7.1.68 CSI-2 Error Status
        69. 6.7.1.69 CSI-2 Errors Data Lanes 0 and 1
        70. 6.7.1.70 CSI-2 Errors Data Lanes 2 and 3
        71. 6.7.1.71 CSI-2 Errors Clock Lane
        72. 6.7.1.72 CSI-2 Packet Header Data
        73. 6.7.1.73 Packet Header Word Count 0
        74. 6.7.1.74 Packet Header Word Count 1
        75. 6.7.1.75 CSI-2 ECC
        76. 6.7.1.76 IND_ACC_CTL
        77. 6.7.1.77 IND_ACC_ADDR
        78. 6.7.1.78 IND_ACC_DATA
        79. 6.7.1.79 FPD3_TX_ID0
        80. 6.7.1.80 FPD3_TX_ID1
        81. 6.7.1.81 FPD3_TX_ID2
        82. 6.7.1.82 FPD3_TX_ID3
        83. 6.7.1.83 FPD3_TX_ID4
        84. 6.7.1.84 FPD3_TX_ID5
      2. 6.7.2 Indirect Access Registers
        1. 6.7.2.1 PATGEN Registers
        2. 6.7.2.2 Analog Registers
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Power-over-Coax
    2. 7.2 Typical Applications
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 CSI-2 Interface
        2. 7.2.2.2 FPD-Link III Input / Output
        3. 7.2.2.3 Internal Regulator Bypassing
        4. 7.2.2.4 Loop Filter Decoupling
      3. 7.2.3 Application Curve
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Power-Up Sequencing
        1. 7.3.1.1 System Initialization
          1. 7.3.1.1.1 Code Example for Temperature Ramp Initialization
      2. 7.3.2 Power Down (PDB)
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 CSI-2 Guidelines
      2. 7.4.2 Layout Examples
  9. 8 Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Support Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6.4.1.5 Configuring CLK_OUT

When using the DS90UB935-Q1 in either synchronous or non-synchronous external clock modes, CLK_OUT is intended as a reference clock for the image sensor. CLK_OUT functionality is disabled when operating in non-synchronous internal clocking mode. The frequency of the external CLK_OUT is set by (see Equation 1 and Equation 2).

Equation 1. GUID-96BF790C-9323-42DB-98A1-407D36BF87F9-low.gif

where

  • FC is the forward channel data rate, and M, HS_CLK_DIV, and N are parameters set by registers 0x06 and 0x07

Equation 2. GUID-24778DE4-1EBE-4FF3-A4C2-CA0D0E3CBF98-low.gif

The PLL that generates CLK_OUT is a digital PLL, and as such, has very low jitter if the ratio N/M is an integer. If N/M is not an integer, then the jitter on the signal is approximately equal to HS_CLK_DIV/FC—so if not possible to have an integer ratio of N/M, then select a smaller value for HS_CLK_DIV.

If a particular CLK_OUT frequency, such as 37.125MHz, is required for a system, the designer can select the values M=9, N=0xF2, and HS_CLK_DIV=4 to achieve an output frequency of 37.190MHz and a frequency error of 0.175% with an associate jitter of approximately 1ns. Alternately, the designer can use M=1, N=0x1B, HS_CLK_DIV=4 for CLK_OUT = 37.037MHz, and a frequency error of 0.24% for less jitter. A third alternative is to use M=1, N=0x1B, and HS_CLK_DIV=4, but rather than using a 25.000MHz reference clock frequency (REFCLK) for the deserializer in synchronous mode, use a frequency of 25.059MHz. The 2x reference then fed to the DS90UB935-Q1 from the deserializer back channel allows generating CLK_OUT = 37.124MHz with both low jitter and a low frequency error.