Automotive SPI Communication Interface (ASCI)

Enables Robust Daisy-Chain EMC/EMI Performance and Cost Effective Isolation Solution

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The MAX17841B ASCI combines an SPI port with a universal asynchronous receiver transmitter (UART) specially designed to interface with Maxim battery management devices.

The UART can be configured to automatically perform Manchester encoding/decoding, message framing, parity, wake-up, and keep-alive signaling as required for Maxim’s battery management UART protocol.

The UART has programmable baud rates of 0.5Mbps, 1Mbps, or 2Mbps and supports either single-ended or differential signaling. For host efficiency, the UART contains a 28-byte transmit buffer and a 62-byte receive buffer with host-configurable interrupt events.
MAX17841B: Simplified Operating Circuit MAX17841B: Simplified Operating Circuit Enlarge+

Key Features

  • Supports Maxim’s Battery Management UART Protocol
  • SPI Interface Up to 4MHz
  • UART Baud Rate Programmable Up to 2Mbps
  • 3.3V or 5V Operation
  • Ultra-Low Quiescent Current
  • Transmit and Receive Buffers with Programmable Interrupts Allow for Queuing of UART Messages
  • Manchester Encoder and Decoder Reduces Host Controller Burden
  • Operating Temperature Range from -40°C to +105°C (AEC-Q100 Type 2)
  • Supports ASIL Requirements


  • Battery Management Systems (BMS)
  • Electric and Hybrid Vehicles (EV/HEV)
  • Energy Storage Systems (ESS)

See parametric specs for UART-to-SPI Bridge (1)

Part NumberµP I/FChannelsICC
Oper. Temp.
typSee Notes
MAX17841B SPI12.3
-40 to +105
$3.26 @1k

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX17841EVMINIQU: Evaluation Kit for the MAX17841B
Request Reliability Report for: MAX17841B 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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