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Automotive SPI Communication Interface (ASCI)

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

Product Details

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.

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

Applications/Uses

  • Battery Management Systems (BMS)
  • Electric and Hybrid Vehicles (EV/HEV)
  • Energy Storage Systems (ESS)
Parametric specs for UART-to-SPI Bridge
µP I/F SPI
# Channels 1
ICC (mA) (typ) 2.3
VSUPPLY (V) 5
Oper. Temp. (°C) -40 to +105
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
$3.26 @1k
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Simplified Block Diagram

MAX17841B: Simplified Operating Circuit MAX17841B: Simplified Operating Circuit Zoom icon

Technical Docs

Design & Development

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Description

The MAX17841B evaluation kit (EV kit) demonstrates the capabilities of the MAX17841B automotive SPI communication interface (ASCI) IC, in conjunction with a Maxim high-voltage data-acquisition system (MHVDAS). The MAX17841B allows the connection of multiple high-voltage data-acquisition IC EV kits, supporting up to a 32-device (max) daisy-chain configuration.

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Features

  • Supports Maxim’s Battery-Management UART Protocol
  • SPI Interface Up to 4MHz
  • Supports ASIL Requirements
  • Windows XP®-, Windows Vista®-, Windows® 7-, and Windows 10-Compatible Software
  • Proven PCB Layout
  • Fully Assembled and Tested

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Parameters

Parametric specs for UART-to-SPI Bridge
µP I/F SPI
# Channels 1
ICC (mA) (typ) 2.3
VSUPPLY (V) 5
Oper. Temp. (°C) -40 to +105
Package/Pins TSSOP/16
Budgetary
Price (See Notes)
$3.26 @1k

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

Applications/Uses

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

Description

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.

Simplified Block Diagram

MAX17841B: Simplified Operating Circuit MAX17841B: Simplified Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal