Automotive Network Communication

The platform configuration of automotive network communication has been changing because motor vehicles are rapidly becoming electrified and digitalized. Toshiba offers automotive network communication devices that meet the needs of the times. The automotive communication protocol standard CXPI has a high-speed response suitable for networks of automotive body system applications such as steering switches, light switches etc. or interfaces of zone ECUs. Moreover, its multiplex communication brings about reduction of the number of wiring harnesses, helping to reduce vehicle body weight.

Automotive Network Communication roadmap

What is CXPI?

CXPI(Clock Extension Peripheral Interface) is an international standard (ISO 20794) for automotive communication protocols.
This standard which provides a multiplex communication method was established for next-generation automotive sub-networks to bring about reduction of the number of wiring harnesses of HMI(Human Machine Interface) devices, helping to reduce vehicle body.
CXPI is superior to LIN in terms of two-way communication between a commander and responders, large-capacity data transfer, and high-speed response.

Application examples

  • Steering switches
  • Combination switches
  • Light switches
  • Door latch, Door mirror
  • Power seat, Seat heater
  • Body system applications
This figure lists Application Areas for Toshiba's Analog Devices.

Positioning and benefits of CXPI

Positioning of CXPI

LIN communication has been widely used in conventional automotive body applications. However, LIN communication uses periodic transmissions and responses from the commander node to the responder nodes, making it difficult to apply to applications such as switches that require responsiveness. However, CXPI can be sent from either the commander node or the responder node.
Additionally, it is possible to efficiently send and receive data from a variety of applications, since it is a protocol that can handle large amounts of data at once compared to LIN.

Comparison of LIN and CXPI

Lineup

Product number Package Functions Applications Features Current consumption in sleep mode Maximum communication speed Power supply Reliability test level

TB9032FNG

 P-SOP8-0405-1.27-002 Physical layer interface conforming to CXPI, an automotive communication protocol standard

CXPI physical layer interface for the following applications (Driver Receiver) 

  • Zone ECU 
  • Automotive body applications
  • Switchable between commander node and responder node via an external pin
  • Built-in various error detection functions
 5μA(Typ.) 20kbps BATT To be AEC-Q100 qualified

TB9033FTG

 P-VQFN28-0606-0.65-003 CXPI compliant H/W logic interface IC (for responder node only)
  • Automotive body applications such as steering switches, meter cluster switches, light switches, door locks, and door mirrors
  • 16 pins for GPIO input/output (4 pins for PWM, 6 pins for ADC) 
  • Built-in various error detection functions
 10μA(Typ.) 20kbps BATT To be AEC-Q100 qualified

* TB9032FNG has passed the CXPI physical layer test (ISO 20794-7 [8 Physical layer conformance test plan (PMA – PS separate type)]) conducted by a third party*1).

*1) Advanced Data Controls Corp.

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