Shulou(Shulou.com)06/02 Report--

FRAM devices provide non-volatile storage, with 10 years of data storage time, a fraction of the power required to replace with familiar flash memory and EEPROM. With existing FRAM-based memory and MCU devices, engineers can rest assured in their ability to build these powerful devices into low-power energy collection applications despite intermittent power outages and long-term data retention. Next, Fujitsu FRAM agents introduce the equipment configuration.

Equipment configuration

Designers can find FRAM memory to support parallel, SPI serial or I2C / 2-wire serial interfaces. For example, along with its parallel 1Mb MB85R1001A FRAM, Fujitsu provides 1MB's SPI serializer, MB85RS1MT, to enable designers to use any number of devices in a typical SPI master / slave configuration (figure 1). In addition to operating in parallel at lower supply voltages than their peers, serial FRAM devices also offer smaller package options for space-constrained designs. For example, ROHM Semiconductor 32K SPI Serial MR45V032A is available in an 8-pin plastic small form factor package (SOP) with only 0.154 measurements and a width of 3.90mm.

Fujitsu MB85RS1MT image

Figure 1: devices such as the Fujitsu MB85RS1MT allow the use of MCU equipped with familiar master / slave configurations for SPI--or use the device's SI and SO ports for non-SPI-based designs, simple bus connection solutions. (provided by Fujitsu Semiconductor)

The advantages of FRAM technology extend to microcontrollers, such as the Texas Instruments MSP430FR MCU series with on-chip FRAM. In the microcontroller, the high-speed overall processing of the FRAM allows writing to non-volatile memory for full speed rather than forcing the MCU into a waiting state or blocking interrupts. An extension of TI's Fram family of microcontrollers, such as MSP430FR5739's full-function MSP430FR5969 series of devices. The smallest device in the MSP430 series, the MSP430FR5739 is a 24-pin 2 × 2 chip size ball grid array (DSBGA) available, but includes five timers, a 12-channel 10-bit ADC, and direct memory access (DMA) to minimize time in active mode.

TI's MSP430FR5969 is the company's low-power MCU with substantial chip FRAM storage (figure 2). In active mode, the MCU only needs to be enabled for 100 μ A / MHz active mode current and 450 nA standby mode current and real-time clock (RTC). The devices in this series include a comprehensive peripheral and a 16-channel 12-bit analog-to-digital converter (ADC) capable of single-layer or differential input operation. These MCU are also equipped with 256bit Advanced encryption Standard (AES) accelerators and intellectual property (IP) encapsulation modules to protect critical data.

Images of Texas Instruments MSP430FR5969 MCU

Figure 2: Texas Instruments MSP430FR5969 MCU combines the peripheral full set with on-chip FRAM memory, which requires only 100 μ A / MHz active mode current and significantly fewer low power modes (LPM). (provided by Texas Instruments)

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