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FM24CL16B-DGTR Folha de dados(PDF) 3 Page - Ramtron International Corporation |
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FM24CL16B-DGTR Folha de dados(HTML) 3 Page - Ramtron International Corporation |
3 / 13 page FM24CL16B - 16Kb 3V I2C F-RAM Rev. 1.4 Feb. 2011 Page 3 of 13 Overview The FM24CL16B is a serial FRAM memory. The memory array is logically organized as a 2,048 x 8 memory array and is accessed using an industry standard two-wire interface. Functional operation of the FRAM is similar to serial EEPROMs. The major difference between the FM24CL16B and a serial EEPROM with the same pinout relates to its superior write performance. Memory Architecture When accessing the FM24CL16B, the user addresses 2,048 locations each with 8 data bits. These data bits are shifted serially. The 2,048 addresses are accessed using the two-wire protocol, which includes a slave address (to distinguish from other non-memory devices), a row address, and a segment address. The row address consists of 8-bits that specify one of 256 rows. The 3-bit segment address specifies one of 8 segments within each row. The complete 11-bit address specifies each byte uniquely. Most functions of the FM24CL16B either are controlled by the two-wire interface or handled automatically by on-board circuitry. The memory is read or written at the speed of the two-wire bus. Unlike an EEPROM, it is not necessary to poll the device for a ready condition since writes occur at bus speed. That is, by the time a new bus transaction can be shifted into the part, a write operation is complete. This is explained in more detail in the interface section below. Note that the FM24CL16B contains no power management circuits other than a simple internal power-on reset. It is the user’s responsibility to ensure that VDD is within data sheet tolerances to prevent incorrect operation. Two-wire Interface The FM24CL16B employs a bi-directional two-wire bus protocol using few pins and little board space. Figure 2 illustrates a typical system configuration using the FM24CL16B in a microcontroller-based system. The industry standard two-wire bus is familiar to many users but is described in this section. By convention, any device that is sending data onto the bus is the transmitter while the target device for this data is the receiver. The device that is controlling the bus is the master. The master is responsible for generating the clock signal for all operations. Any device on the bus that is being controlled is a slave. The FM24CL16B is always a slave device. The bus protocol is controlled by transition states in the SDA and SCL signals. There are four conditions including Start, Stop, Data bit, and Acknowledge. Figure 3 illustrates the signal conditions that define the four states. Detailed timing diagrams are in the electrical specifications. Microcontroller SDA SCL FM24CL16B SDA SCL Other Slave Device VDD Rmin = 1.1 Kohm Rmax = tR/Cbus Figure 2. Typical System Configuration |
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