MAX96751 datasheet(39/289 Pages) AD

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Thermal Management

Power consumption of GMSL2 devices varies based on their use case. Care must be taken by the user to provide

sufficient heat dissipation with proper board and cooling design techniques. The package's exposed pad must be

connected to the PCB ground plane by an array of vias. This approach simultaneously provides the lowest electrical and

thermal impedances.

System thermal management must keep the operating junction temperature below +125°C to meet electrical

specifications and avoid impacting device reliability.

For detailed information on package thermal considerations, refer to www.analog.com/thermal-tutorial.

Control Channel and Side Channels

A μC or other controller can send and receive control and side-channel data over the GMSL2 serial link simultaneously

with high-speed video data. All GMSL2 devices support the following interfaces:

● Primary I2C/UART (internal access)

● Pass-through I2C/UART

● SPI

● GPIO

Some GMSL2 devices also support the following interface:

● I2S/TDM audio

Data from all these interfaces tunnel through the GMSL2 link, but it is only through the primary I2C/UART interface that

the GMSL2 device registers can be accessed and configured.

The side channel, with its various interfaces, is accessed through multifunction GPIO pins (MFPs on some devices).

Multifunction pins have a default function and can be programmed to an alternate function after power-up. Due to a

practical limit in the number of pins available on a given device, not all interfaces can be simultaneously supported.

See Table 8 and the Pin Description section for default and alternate multifunction pin functions, as well as available

combinations of interfaces.

Primary I2C/UART

The primary I2C/UART is located on the SDA_RX and SCL_TX pins of each GMSL2 device. The I2C (SDA, SCL) or

UART (Tx, Rx) interface is selected by the I2CSEL configuration pin state at power-up (see the Latch-On-Power-Up Pins

section). The selected interface provides main access to GMSL2 registers, as well as peripheral device registers, from

either end of the link.

The main μC can be located on either end of the link (usually the serializer side for display applications and the

deserializer side for camera applications). Dual main μCs are supported, wherein DIS_REM_CC settings in register

I2C_6 for each link can disable the remote Control Channel communications on that link. Optionally, software arbitration

(such as token passing) can be used to prevent packet collisions.

To configure peripheral devices over the link, the GMSL2 serializer and deserializer must use the same control channel

interface (both I2C or both UART). Unlike GMSL1 devices, there is no I2C-to-UART conversion capability. I2C/UART

outputs are open drain and require appropriately-sized external pull-up resistors for proper operation.

For detailed primary channel programming information, see the Control Channel Programming section under Applications

Information.

Pass-Through I2C/UART

GMSL2 devices have two pass-through I2C/UART channels. These channels do not have access to registers in either

the GMSL2 serializer or the deserializer; they simply tunnel the I2C or UART signal through the GMSL2 link. This can be

useful for separating I2C channels so that multi-main conflicts do not occur. The I2C/UART outputs are open drain and

require appropriately sized external pull-up resistors for proper operation.

SPI

GMSL2 enables a host SPI main on one side of the GMSL2 link to control a peripheral SPI subordinate on the opposite

side. Communication can be in either direction across the GMSL2 link. Although multiple SPI peripherals may be

MAX96751

GMSL2 Serializer with HDMI 2.0 Input

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