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《MAX9272A：高效率汽车摄像系统解串器》 MAX9272A是一款紧凑型解串器，专为通过50Ω同轴电缆或100Ω屏蔽双绞线（STP）与GMSL串行器进行接口而设计。这款设备与MAX9271或MAX9273串行器配合使用，适用于汽车摄像头系统等应用。其主要特点在于提供灵活的数据序列化处理和高效能，同时考虑了在恶劣环境下的稳定性和抗干扰能力。该解串器具有单输出和双输出的可编程功能。双输出模式下，每个像素时钟周期会驱动半个并行字，这对于支持具有双输入特性的GMSL串行器来说非常实用。此外，它还集成了一条嵌入式控制通道，工作速率在9.6kbps至1Mbps之间，能够在视频时序独立的情况下，由微控制器（µC）随时编程串行器/解串器及外围设备的寄存器。设备提供了两个可编程GPIO端口和一个连续采样的GPI输入，增强了系统的可扩展性。为了适应长距离电缆传输，MAX9272A内置了可编程均衡器，能够在全速状态下支持长达15米的电缆。串行输入满足ISO 10605和IEC 61000-4-2 ESD标准，确保了高电磁兼容性。核心电源电压范围为1.7V至1.9V，I/O电源电压范围为1.7V至3.6V，采用48引脚（7mm x 7mm）TQFN-EP封装，引脚间距仅为0.5mm，工作温度范围覆盖-40ºC到+105ºC。该设备的主要优点包括： 1. 适配低成本50Ω同轴电缆和FAKRA连接器或100Ω STP，降低了硬件成本。 2. 内置错误检测/校正机制，提高数据传输的可靠性。 3. 提供9.6kbps至1Mbps的控制通道，支持I2C-to-I2C模式，并具有时钟拉伸功能，增强系统灵活性。 4. 在单输出或双输出模式下，串行比特率最高可达1.5Gbps，支持6.25MHz至100MHz的时钟频率，适用于高清摄像头应用。 5. 多种控制通道模式，如UART-to-UART或UART-to-I2C模式，以适应不同的系统需求。 6. 通过可编程的输入摆幅（100mV至500mV），优化信号质量，降低电磁干扰（EMI）并减少屏蔽需求。 MAX9272A是汽车摄像头系统中的理想选择，它以卓越的电流效率、高度的灵活性和强大的抗干扰能力，确保了数据传输的高效和可靠，满足了现代汽车电子设备对于高速、低功耗和稳定性的需求。

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General Description

The MAX9272A compact deserializer is designed to

interface with a GMSL serializer over 50Ω coax or 100Ω

shielded twisted-pair (STP) cable. The device pairs with

the MAX9271 or MAX9273 serializers.

The parallel output is programmable for single or double

output. Double output strobes out half of a parallel word

on each pixel clock cycle. Double output can be used with

GMSL serializers that have the double-input feature.

The device features an embedded control channel that

operates at 9.6kbps to 1Mbps. Using the control chan-

nel, a microcontroller (µC) can program the serializer/

deserializer and peripheral device registers at any time,

independent of video timing. Two programmable GPIO

ports and a continuously sampled GPI input are available.

For use with longer cables, the device has a program-

mable equalizer. Programmable spread spectrum is avail-

able on the parallel output. The serial input meets ISO

10605 and IEC 61000-4-2 ESD standards. The core sup-

ply range is 1.7V to 1.9V and the I/O supply range is 1.7V

to 3.6V. The device is available in a 48-pin (7mm x 7mm)

TQFN-EP package with 0.5mm lead pitch and operates

over the -40ºC to +105ºC temperature range.

Applications

● Automotive Camera Systems

Benets and Features

● Ideal for Camera Applications

• Works with Low-Cost 50Ω Coax Cable and

FAKRA Connectors or 100Ω STP

• Error Detection/Correction

• 9.6kbps to 1Mbps Control Channel in I

C-to-I

Mode with Clock-Stretch Capability

• Best-in-Class Supply Current: 90mA (max)

• Double-Rate Clock for Megapixel Cameras

• Cable Equalization Allows 15m Cable at Full

Speed

• 48-Pin (7mm x 7mm) TQFN-EP Package with

0.5mm Lead Pitch

● High-Speed Data Deserialization for Megapixel

Cameras

• Up to 1.5Gbps Serial-Bit Rate with Single or

Double Output: 6.25MHz to 100MHz Clock

● Multiple Control-Channel Modes for System Flexibility

• 9.6kbps to 1Mbps Control Channel in UART-to-

UART or UART-to-I

C Modes

● Reduces EMI and Shielding Requirements

• Input Programmable for 100mV to 500mV

• Single-Ended or 50mV to 400mV Differential

• Programmable Spread Spectrum on the Parallel

Output Reduces EMI

• Tracks Spread Spectrum on Serial Input

● Peripheral Features for Camera Power-Up and

Verification

• Built-In PRBS Checker for BER Testing of the

Serial Link

• Two GPIO Ports

• Dedicated “Up/Down” GPI for Camera Frame

Sync Trigger and Other Uses

• Remote/Local Wake-Up from Sleep Mode

● Meets Rigorous Automotive and Industrial

Requirements

• -40ºC to +105ºC Operating Temperature

• ±10kV Contact and ±15kV Air IEC 61000-4-2

ESD Protection

• ±10kV Contact and ±30kV Air ISO 10605 ESD

Protection

Ordering Information appears at end of data sheet.

Typical Application Circuit appears at end of data sheet.

For related parts and recommended products to use with this part, refer

to www.maximintegrated.com/MAX9272A.related.

19-7404; Rev 0; 5/14

MAX9272A 28-Bit GMSL Deserializer for Coax or STP Cable

EVALUATION KIT AVAILABLE

TABLE OF CONTENTS

General Description ............................................................................ 1

Applications .................................................................................. 1

Benefits and Features .......................................................................... 1

Absolute Maximum Ratings* ..................................................................... 6

Package Thermal Characteristics (Note 1) .......................................................... 6

DC Electrical Characteristics ..................................................................... 6

AC Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Typical Operating Characteristics ................................................................ 10

Pin Configuration ............................................................................. 12

Pin Description ............................................................................... 12

Functional Diagram ........................................................................... 14

Detailed Description........................................................................... 18

Bit Map ...................................................................................18

Serial Link Signaling and Data Format...........................................................24

Reverse Control Channel .....................................................................24

Data-Rate Selection .........................................................................24

Control Channel and

UART Interface .............................................................................25

Interfacing Command-Byte-Only

C Devices with UART ....................................................................26

UART Bypass Mode ......................................................................26

C Interface ...............................................................................26

START and STOP Conditions ...............................................................28

Bit Transfer..............................................................................28

Acknowledge ............................................................................28

Slave Address ...........................................................................29

Bus Reset...............................................................................29

Format for Writing ........................................................................29

Format for Reading .......................................................................29

C Communication with Remote-Side Devices .................................................30

C Address Translation ......................................................................30

Control-Channel Broadcast Mode ..............................................................30

GPO /GPI Control ...........................................................................30

PRBS Test .................................................................................31

Line Equalizer ..............................................................................31

MAX9272A 28-Bit GMSL Deserializer for Coax or STP Cable

www.maximintegrated.com

Maxim Integrated

│

TABLE OF CONTENTS (continued)

Spread Spectrum ...........................................................................31

Manual Programming

of the Spread-Spectrum Divider ................................................................31

Additional Error Detection and Correction ........................................................32

Cyclic Redundancy Check (CRC) ...........................................................32

Hamming Code ..........................................................................32

HS/VS Encoding and/or Tracking ..............................................................32

Serial Input ................................................................................32

Coax-Mode Splitter ..........................................................................32

Cable Type Configuration Input (CX/TP) .........................................................33

Sleep Mode................................................................................33

Power-Down Mode ..........................................................................33

Configuration Link...........................................................................33

Link Startup Procedure ........................................................................ 34

Applications Information........................................................................ 36

Error Checking .............................................................................36

ERR Output................................................................................36

Autoerror Reset.............................................................................36

Dual µC Control ............................................................................36

Changing the Clock Frequency.................................................................36

Fast Detection of

Loss-of-Synchronization ......................................................................36

Providing a Frame Sync

(Camera Applications)........................................................................37

Software Programming

of the Device Addresses......................................................................37

Three-Level Configuration Inputs ...............................................................37

Configuration Blocking .......................................................................37

Compatibility with other GMSL Devices ..........................................................37

GPIOs ....................................................................................37

Staggered Parallel Outputs....................................................................37

Local Control-Channel Enable (LCCEN) .........................................................38

Internal Input Pulldowns ......................................................................38

Choosing I

C/UART Pullup Resistors............................................................38

AC-Coupling ...............................................................................38

Selection of AC-Coupling Capacitors ............................................................38

Power-Supply Circuits and Bypassing ...........................................................39

MAX9272A 28-Bit GMSL Deserializer for Coax or STP Cable

www.maximintegrated.com

Maxim Integrated

│

LIST OF FIGURES

Figure 1. Reverse Control-Channel Output Parameters ............................................... 15

Figure 2. Test Circuit for Differential Input Measurement .............................................. 16

Figure 4. Parallel Clock Output High and Low Times ................................................. 16

Figure 5. I

C Timing Parameters ................................................................. 16

Figure 3. Worst-Case Pattern Output ............................................................. 16

Figure 6. Output Rise-and-Fall Times ............................................................. 17

Figure 7. Deserializer Delay..................................................................... 17

Figure 8. GPI-to-GPO Delay .................................................................... 17

Figure 9. Lock Time ........................................................................... 18

Figure 10. Power-Up Delay ..................................................................... 18

Figure 11. Single-Output Waveform (Serializer Using Single Input) ...................................... 19

Figure 12. Single-Output Waveform (Serializer Using Double Input) ..................................... 19

Figure 13. Double-Output Waveform (Serializer Using Single Input) ..................................... 20

Figure 14. Double-Output Waveform (Serializer Using Double Input) .................................... 20

Figure 15. Serial-Data Format ................................................................... 24

Figure 16. GMSL UART Protocol for Base Mode .................................................... 25

Figure 17. GMSL UART Data Format for Base Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

Figure 18. SYNC Byte (0x79).................................................................... 26

Figure 19. ACK Byte (0xC3)..................................................................... 26

Figure 20. Format Conversion Between GMSL UART and I

C with Register Address (I2CMETHOD = 0)........ 27

Figure 21. Format Conversion Between GMSL UART and I

C with Register Address (I2CMETHOD = 1) ........ 27

TABLE OF CONTENTS (continued)

Power-Supply Table .........................................................................39

Cables and Connectors ......................................................................39

Board Layout...............................................................................39

ESD Protection .............................................................................39

Typical Application Circuit ...................................................................... 46

Ordering Information .......................................................................... 46

Chip Information .............................................................................. 46

Package Information .......................................................................... 46

Revision History .............................................................................. 47

MAX9272A 28-Bit GMSL Deserializer for Coax or STP Cable

www.maximintegrated.com

Maxim Integrated

│

LIST OF FIGURES (continued)

LIST OF TABLES

Table 1. Power-Up Default Register Map (see Table 16)............................................... 21

Table 2. Output Map........................................................................... 23

Table 3. Data-Rate Selection Table ............................................................... 24

Table 4. I

C Bit-Rate Ranges ................................................................... 30

Table 5. Cable Equalizer Boost Levels ............................................................ 31

Table 6. Parallel Output Spread.................................................................. 31

Table 7. Modulation Coefficients and Maximum SDIV Settings ......................................... 31

Table 8. Configuration Input Map................................................................. 33

Table 9. Startup Procedure for Video-Display Applications ............................................ 34

Table 10. Startup Procedure for Image-Sensing Applications .......................................... 35

Table 11. MAX9272A Feature Compatibility ........................................................ 37

Table 12. Staggered Output Delay................................................................ 38

Table 13. Double-Function Configuration .......................................................... 38

Table 14. Typical Power-Supply Currents (Using Worst-Case Input Pattern) ............................... 39

Table 15. Suggested Connectors and Cables for GMSL............................................... 39

Table 16. Register Table (see Table 1)............................................................. 40

Figure 22. START and STOP Conditions .......................................................... 28

Figure 23. Bit Transfer ......................................................................... 28

Figure 24. Acknowledge........................................................................ 28

Figure 25. Slave Address....................................................................... 29

Figure 26. Format for I

C Write .................................................................. 29

Figure 27. Format for Write to Multiple Registers .................................................... 29

Figure 28. Format for I

C Read .................................................................. 30

Figure 29. 2:1 Coax-Mode Splitter Connection Diagram............................................... 33

Figure 30. Coax-Mode Connection Diagram........................................................ 33

Figure 31. State Diagram, Remote Microcontroller Application.......................................... 35

Figure 32. Human Body Model ESD Test Circuit..................................................... 39

Figure 33. IEC 61000-4-2 Contact Discharge ESD Test Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

Figure 34. ISO 10605 Contact Discharge ESD Test Circuit ............................................ 40

MAX9272A 28-Bit GMSL Deserializer for Coax or STP Cable

www.maximintegrated.com

Maxim Integrated

│

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