FM25V05-GTR F-RAM

Technical Specifications of FM25V05-GTR

Datasheet	FM25V05-GTR datasheet
Category	Integrated Circuits (ICs)
Family	Memory
Manufacturer	Cypress Semiconductor Corp
Series	–
Packaging	Tape & Reel (TR)
Part Status	Active
Format – Memory	RAM
Memory Type	FRAM (Ferroelectric RAM)
Memory Size	512K (64K x 8)
Speed	40MHz
Interface	SPI Serial
Voltage – Supply	2 V ~ 3.6 V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154″, 3.90mm Width)
Supplier Device Package	8-SOIC

FM25V05-GTR Functional Description

The FM25V05-GTR uses state-of-the-art ferroelectric technology to create a 512-Kbit nonvolatile memory. Nonvolatile and functioning similarly to RAM in terms of reads and writes is ferroelectric random access memory or F-RAM Nonvolatile memory, such as serial flash and EEPROM, which has reliability issues at the system level. Still, our technique eliminates those concerns while allowing for 151 years of data retention with minimal added effort. The FM25V05 can conduct write operations at bus speed faster than serial flash and EEPROM. There are no hold ups caused by the need to write.

Once a byte has been successfully transported to the device, it is instantly written to the memory array. No poll for data is needed before starting the next bus cycle. In addition, compared to other types of nonvolatile memory, the device has impressive write durability. The FM25V05 can withstand 100,000,000 times more write cycles than EEPROM or 1014 read/write cycles. The FM25V05’s features make it an excellent choice for applications requiring frequent or quick writes to nonvolatile memory. For data collecting, the number of write cycles may be crucial. In contrast, the long write time of serial flash or EEPROM can lead to data loss in controllers for demanding industrial processes.

Users of serial EEPROM or flash will find the FM25V05 an excellent drop-in replacement for their existing gear. The FM25V05 takes advantage of the high-speed SPI bus, which improves the already rapid write speed of F-RAM technology. A read-only Device ID is built into the gadget, letting the host learn who made it and how many of them were made. Over an operating temperature range of -40 to +85 degrees Celsius, the gadget is guaranteed to perform to specifications.

FM25V05-GTR Features

512 kilobytes (Kb) of logically ordered 64 K by 8 Kb data cells in a ferroelectric random-access memory (F-RAM).

• Designed to withstand a whopping one trillion (1014) reads and writes.
• Records can be kept for 151 years.
• Including NoDelayTM writes in its list of features.
• It uses cutting-edge ferroelectric technology that is extremely reliable.

High-speed serial peripheral interface (SPI)

• Equipped with a frequency range of up to 40 MHz.
• It has all the same advantages as serial flash and EEPROM and can be used as a direct hardware replacement for either.
• Both SPI modes 0 (0, 0) and 3 (1, 1) are supported (1, 1).

Sophisticated Write Protection Scheme

• Provides security via a hardware mechanism, the Write Protect (WP) pin.
• The software is protected against being accidentally changed with its Write Disable instruction.
• It has software-based block protection for either a partial or complete array.

Low Power Consumption

• Features 300 A active current at 1 MHz
• Features 90 A (typ) standby current
• Features 5 A sleep mode current
• Features Low-voltage operation of VDD = 2.0 V to 3.6 V
• Features Industrial temperature of –40 C to +85 C
• Features 8-pin small outline integrated circuit (SOIC) package
• Restriction of hazardous substances (RoHS) compliant

FM25V05-GTR Functional Overview

Serial F-RAM memory, as provided by the FM25V05 is used to facilitate access, a serial peripheral interface (SPI) bus is used to read and write to the memory array, which is logically arranged as 65,536 x 8 bits. F-functionality RAMs are analogous to those of serial flash and serial EEPROMs. F-RAMs like the FM25V05 stand out from serial flash and EEPROMs with the same pinout because of their improved write performance, high durability, and low power consumption.

Memory Architecture

The FM25V05 has 64K addressable locations, each of which may store eight bits of information. These eight bits of information are serially inserted or removed. The SPI protocol is used to gain access to the addresses; it consists of an opcode, a two-byte address, and a chip choice (to allow numerous devices on the bus). Every byte in a file has its unique address, which is specified by the full 16-bit address. The SPI interface and onboard circuitry of the FM25V05 control most of its operations. Except for the time required for the serial protocol, memory operations have almost no access time. This means data can be read from or written to the memory at the same rate as the SPI bus. Since writes occur at bus speed, there’s no need to poll the device for a ready condition, like with a serial flash or EEPROM. A write operation is finished when a new bus transaction may be moved into the device. The interface section provides additional clarification on this point.

Serial Peripheral Interface – SPI Bus

The maximum frequency at which the FM25V05 may function as an SPI slave is 40 MHz. The SPI master can use the high-performance serial communication offered by this high-speed serial channel. Numerous widely used microcontrollers provide hardware SPI connections that allow for a direct connection. If your microcontroller doesn’t have this port, you may easily simulate it with regular port pins. The FM25V05 supports SPI Mode 0 and SPI Mode 3.

SPI Overview

The Serial Peripheral Interface (SPI) uses a four-pin configuration consisting of a Chip Select (CS) pin, a Serial Input (SI) pin, a Serial Output (SO) pin, and a Serial Clock (SCK) pin. The SPI is a synchronous serial interface that allows numerous devices to share a single data bus and communicate with one another using only the clock and data pins for memory access. The CS pin enables a device to connect to the SPI bus. SPI mode specifies the order in which chip select, clock, and data are transferred.

This device supports modalities 0 and 3 of the SPI protocol. In both modes, data is clocked into the F-RAM on the first rising edge of SCK after CS is activated. Opcodes govern the SPI protocol. These opcodes outline the directives issued by the bus master to the subservient device. The opcode is the first byte sent by the bus master after CS is enabled. The transfer of addresses and data occurs after the opcode. After a process is complete and before a new opcode can be issued, the CS must become dormant. The following are frequent phrases utilized in the SPI protocol:

SPI Master

The SPI master device acts as the boss when talking about an SPI bus. Only one “master” device and any number of “slave” devices are allowed on an SPI bus. The CS pin on the master device allows it to pick any of the slaves on the SPI bus. All tasks begin when the master pulls the CS pin of the slave device LOW, initiating the slave device. Transmissions on the SI and SO lines are time-stamped according to the SCK, which the master likewise generates.

SPI Slave

The Chip Select line is used by the master device to initiate the SPI slave device. Whenever data is transferred between devices using the SPI protocol, the SCK is provided as input by the SPI master and is used to time-stamp each transfer. An SPI slave always waits for instructions from the SPI bus master before sending or receiving any data. The FM25V05 can interact with other SPI slave devices and operates on the SPI bus.

Chip Select (CS)

The master must hold down the matching CS pin on the selected slave device to make it the active one. Only while the CS pin is LOW can any instruction be sent to a slave device. A high-impedance condition is maintained at the serial output pin (SO), and the serial input (SI) pin is ignored when the device is not selected. Note The trough of computer science education is an excellent place to start a new curriculum. So, only one opcode can be executed during a given Chip Select cycle.

Serial Clock (SCK)

Once CS is driven low, the SPI master generates the Serial Clock, which synchronizes all communications. SPI modes 0 and 3 are supported for data transfer with the FM25V05. The slave device latches the inputs on the rising edge of SCK and issues outputs on the falling edge in both modes. An SPI instruction arrived on the SI pin when the instruction’s first bit (MSB) rose on SCK. Additionally, data inputs and outputs are synced with SCK.

Data Transmission (SI/SO)

Two lines are used for serial data transfer on the SPI bus (SI and SO). Both SI and SO can be referred to as Master Out Slave In (MOSI) and Master In Slave Out (SO) (MISO). The master communicates with the slave via the SI pin, and the slave replies with the SO pin. As was previously mentioned, the SI and SO lines can be shared across multiple slave devices. Figure 2 depicts one possible configuration for connecting the FM25V05’s SI and SO pins to the master. If your microcontroller doesn’t have an SPI bus built in, you can always use one of the extra ports for something else. To lessen the amount of necessary equipment

Conclusion

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