New I3C Bus Extension Products With Power and Thermal Management

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  • Renesas’ new I3C Basic bus extension products can be implemented across data centre and server applications, automation and communications equipment
  • Allows design flexibility for engineers implementing I3C Basic as a system management bus

The increase in memory subsystem complexity with distributed power management, telemetry and thermal management at the sub-channel level requires higher sideband bus bandwidth.

Therefore, Renesas Electronics has launched four new I3C Basic bus extension products for control plane designs across a variety of applications, including data centre and server applications, as well as enterprise, factory automation and communications equipment. The new products include the IMX3102 2:1 bus multiplexer, IMX3112 1:2 bus expander, IXP3114 and IXP3104 1:4 general-purpose IO expanders, which support up to 12.5MHz speeds as well as integrated thermal sensor capability.

These new products provide maximum design flexibility for engineers implementing I3C Basic as a system management bus in applications where there may be multiple masters, a large number of endpoint devices and long traces – all of which can impact bus complexity and signal integrity. The integrated thermal sensor allows better integration of thermal management into the bus design and reduces the number of dedicated thermal sensor endpoints.

Enables effective workload

Furthermore, emerging needs for advanced thermal control loops, security and component authentication, and more robust fault tolerance and recovery are creating needs for a high bandwidth interface across the entire server control plane. I3C Basic provides an ideal solution to serve all of these needs. It enables system management architectures to provide precise information about the server resource status during bootup and runtime. This allows system managers to implement effective workload migration and server load balancing to significantly optimize server utilization.

“The complexity of intelligent platform management in modern data centre equipment has finally outstripped the capabilities of decades-old interfaces like I2C and SMBus,” said Rami Sethi, Vice President, Data Center Business Division at Renesas. “We are excited to offer an entire lineup of I3C bus extension devices for large-scale, high-speed control plane designs that enable sophisticated capabilities for environmental control, advanced telemetry, security, and fault recovery.”

Avoids sudden temperature spikes

The IMX3102 2:1 bus multiplexer is well suited for designs where there may be two masters controlling a single peripheral or slave devices. The IMX3112 1:2 bus multiplexer supports designs where a single host is controlling two peripheral or slave devices. The general-purpose IO expanders, IXP3114 (with temperature sensor) and IXP3104 1:4 (no temperature sensor), are designed for a host controller with up to four peripheral or slave devices.

A sudden temperature rise of the motherboard can result in costly system failures. Positioning temperature sensors in multiple locations on the motherboard allows engineers to continuously monitor for potential temperature spikes and direct the CPU to take action as needed to prevent a catastrophic event. The new I3C products feature integrated temperature sensors, reducing overall system costs and improving integration.

Additional features include:

  • Two-wire programmable I2C or I3C Basic bus serial interface
  • Single device load on the host bus
  • Single 1.8V input power supply
  • Integrated temperature sensor accuracy: 0.5 degrees Celsius with 0.25 degrees Celsius
  • Industrial temperature range: -40 degrees Celsius to 125 degrees Celsius
  • Packet error check and parity error check functions
  • Bus reset and bus clear functions
  • In-band interrupt
  • Programmable I2C, I3C Basic bus address
  • 2mm x 3 mm, thermally enhanced 9-pin PSON-8 package

With the new I3C products, Renesas now offers a complete portfolio of I3C and I2C devices. Renesas’ I3C devices and evaluation boards are now available for sampling.


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