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Product Attributes

Introduction

The ADBMS6821 (single) and ADBMS6822 (dual) provide bidirectional isolated serial-port interface (isoSPI) communications between two isolated devices through a single twisted pair connection for each data link. Each transceiver encodes logic states into signals that are transmitted across an isolation barrier to another transceiver. The receiving device decodes the transmission and drives the peripheral bus to the appropriate logic states. The isolation barrier can be bridged by capacitors or by a pulse transformer to achieve hundreds of volts of isolation. The ADBMS6821/ADBMS6822 transceivers drive differential signals using matched source and sink currents, which eliminate the requirement for a transformer center tap and reducing electromagnetic interference (EMI). Precision window comparators in the receiver detect the differential signals. The transceivers can be paired with advanced ADBMS stack monitors to enable cell voltage and sensor monitoring even while the system controller is powered down (less power cell monitoring, or LPCM). The transceivers provide a timeout function that wakes up or alerts the system when a pass heartbeat message has not been received in the programmed time period.

Features

• Up to 2 Mbps isolated bidirectional serial data communications
• Drop in compatible: single (ADBMS6821) and dual (ADBMS6822)
• Fully independent dual transceivers (ADBMS6822)
• Simple galvanic isolation using capacitors or transformers
• Bidirectional interface over a single twisted pair
• Supports cable lengths up to 100 meters
• Very low EMI susceptibility and emissions
• LPCM support for ADBMS battery monitors
• Interrupt output for LPCM system wake-up
• 4 Mbps unidirectional mode
• Requires no software changes in most SPI systems
• Ultra-low idle current
• Automatic interface wake-up detection
• Operating temperature range: -40°C to +125°C
• 3.0V to 5.5V isoSPI driver power supply
• 1.7V to 5.5V interface to microcontrollers
• 3.0V to 30V input for powering wake-up and monitoring functions (12 V battery compatible)
• Available in 32-lead, side solderable LFCSP package
• AEC-Q100 qualified for automotive applications

Applications

• Electric and hybrid electric vehicles
• Backup battery systems
• Industrial networking
• Remote sensors