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AS8221 – FlexRay™ Standard Transceiver


The AS8221 provides an optimized host controller interface


AS8221The ams AS8221 provides an optimized host controller interface consisting of three low-active pins. The Enable (EN) and Standby (STBN) input pins for mode handling by the microcontroller and the Error (ERRN) out- pin where system, chip failures and status information are signaled to the microcontroller. Signaled logic high on the enable and standby, pin the device will enter NORMAL mode in case no fault condition is given and in this mode the device is fully operational meaning FlexRay™ communication is possible. Additionally, a RECEIVE-ONLY mode is implemented, which can be accessed by the microcontroller where only FlexRay streams can be received in order to avoid unwanted disturbances on the FlexRay bus while listening to the bus traffic. In the low-power modes (STANDBY and SLEEP mode) very low- power consumption is achieved.

The AS8221 FlexRay standard transceiver is best fitting for automotive FlexRay nodes where bus wake-up and voltage regulator control for voltage supplies is needed. The device addresses all ECUs connected to the permanent battery supply (clamp 30). The AS8221 can be used as only ECU wake-up component with very low power consumption in SLEEP mode.

Features
  • Compliant with FlexRay™ Electrical Physical Layer Specification V2.1 Rev. B
  • Data transfer up to 10 Mbps
  • Excellent EMC performances
  • Interface for bus guardian or supervision circuits
  • Automatic thermal shutdown protection
  • Supports 12 V and 24 V systems with very low sleep current
  • Integrated power management system
  • Two inhibit pins for external voltage supply control
  • Local wake-up input
  • Remote wake-up capability via FlexRay bus in low-power modes
  • Supports 2.5 V, 3 V, 3.3 V, 5 V microcontrollers, automatic adaptation to digital interface levels
  • Protection against damage due to short circuit conditions
  • Operating temperature range -40°C to +125°C

Digi-Key P/N ams P/N Description
AS8221-ASST-500CT-ND AS8221-ASST-500 IC TXRX FLEXRAY 20-SSOP Datasheet