General description
The MC33665A is a general-purpose battery management communication gateway
and transport protocol link (TPL) transceiver. The device forwards messages upcoming
from different TPL (isolated daisy chain protocol of NXP) ports through a standard
communication protocol. The standard communication protocol ensures compatibility with
microcontrollers available in the market. The MC33665A is designed as a gateway for
serial peripheral interface (SPI), CAN (FD) or universal asynchronous receiver transmitter
(UART) to TPL.
In the SPI or UART variant, the device communicates directly to the MCU by using SPI
or UART. The MC33665A transfers messages between MCU and battery management
system (BMS) devices connected to integrated TPL ports.
In the CAN FD variant, the MC33665A can be communicated with controller area
network (CAN) and CAN FD to send and receive messages to BMS devices connected
on TPL ports. The device powers an external CAN transceiver to be a part of a CAN bus.
The MC33665A provides four TPL ports to communicate with other isolated BMS
devices in the daisy chain. Each daisy chain port supports capacitive and inductive
isolated communication, based on device capabilities use NXP battery cell controllers
like MC33771C, MC33772C, and MC33775A. The MC33665A was developed following
AEC‑Q100 grade 1, automotive quality management (QM) device. The MC33665A is
suitable to be used in safety critical applications up to ASIL D level.

Features and benefits
• MCU host interface supporting SPI, CAN (FD) or UART
– SPI
– Single or dual SPI mode
– Up to 10 Mbit/s data rate
– CAN (FD)
– CAN up to 1 Mbit/s data rate
– CAN FD up to 5 Mbit/s data rate
– UART
– Full duplex operation
– Auto baud rate detection
– Up to 6 MBd data rate
– Selectable IO voltage of 5 V or 3.3 V
• Message buffering
– Configurable response and request buffers
– Status/handshake signals for data flow control
• Communication management unit
– Error detection and reporting
• Multi-port TPL interface
– Four independent TPL daisy chain ports
– Automatic message routing based on address of TPL message
– Support up to four TPL daisy chains and 62 nodes per chain
– Each daisy chain features:
– 2 Mbit/s data rate
– Two-wire daisy chain supporting capacitive or inductive isolation
– Loopback support
– Compatible with TPL2 based products (for example MC33771C or MC33772C)
– Compatible with TPL3 based products (for example MC33775A)
• Message synchronization
– Enables synchronization of messages across all TPL daisy chain ports
– Transmission of messages triggered by external event (SYNC)
– Programmable time delay between messages
• Power supply options
– Supply via external 5 V regulator or integrated 5 V regulator
– Power mode management of the external CAN (FD) transceiver
• Operation modes
– Active mode
– Sleep mode (25 μA typ.)
• Wake-up of the device by
– TPL daisy chain
– MCU communication
– Wake-up input
• Supports internal oscillator with or without external crystal
• General-purpose inputs/outputs (GPIOs) with assignable status and events
• I2C-bus master interface to control external devices, for example, EEPROMs and
security ICs
• Unique device ID
• AEC-Q100 grade 1 qualified: −40 °C to +125 °C ambient temperature range
• Suitable to be used in safety critical applications up to ASIL D level