Analog Devices Inc.

The ADRF8800/ADRF8850 are low power, integrated systems on chip (SoC) that include a 2.4 GHz (industrial scientific medical) ISM band radio and an embedded microcontroller unit (MCU) subsystem.The ADRF8800/ADRF8850 provide wireless communications between the battery cell monitoring chip and the battery management system (BMS) controller. In the wireless battery management system (wBMS), the ADRF8800 nodes reside at the battery cells and take sensor data from the battery cell monitors. The nodes send the data over the air to an ADRF8850 network manager, and the manager provides the data to the BMS controller. The ADRF8850 network manager configures the network of nodes and manages the communications protocol.The embedded MCUs integrate static random access memory (SRAM), embedded flash memory, one-time programmable (OTP) memory, and an analog subsystem that provides clocking and reset.The ADRF8800/ADRF8850 has a rich set of peripherals, including serial peripheral interface (SPI), general-purpose input and output (GPIOs) ports, universal asynchronous receiver/transmitter (UART), and Joint Test Action Group (JTAG) port, as well as an analog-to-digital converter (ADC) and temperature sensor.The ADRF8800/ADRF8850 provide secure boot using software stored in read only memory (ROM) that authenticates the next boot stage using a hardware accelerated 256-bit elliptic curve cryptography (ECC-256) engine. Other hardware accelerated cryptographic features include the 128-bit advanced encryption standard (AES-128), 256-bit advanced encryption standard (AES-256), and Secure Hash Algorithm 256 (SHA-256). The ADRF8800/ADRF8850 have protected key storage with a root encrypted key generated on-chip that is only accessible to the on-chip hardware. The devices incorporate a true random number generator (TRNG) that is used to seed a National Institute of Standards and Technology (NIST) certified deterministic random bit generator (DRBG). The ADRF8800/ADRF8850 also include support for secure firmware updates with rollback protection. The in-field OTP memory is included to enforce the access control of debug ports and memory access once a device is ready for deployment.The ADRF8800/ADRF8850 feature on-chip, low dropout (LDO) regulators that allow the devices to be powered by a single 3.3 V nominal supply, provided by an external power management IC (PMIC) either stepping down from a high voltage bus or a 12 V battery.Each ADRF8800/ADRF8850 uses a single 40 MHz crystal to provide precision timing for the system.The ADRF8800/ADRF8850 are available in a 7 mm ? 7 mm body size, 48-lead LQFP_EP package, measuring 9 mm ? 9 mm when leads are included.APPLICATIONS Wireless Battery Management Systems

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