User Manual Part 1

CY8CKIT-042-BLE Bluetooth® Low Energy (BLE) Pioneer Kit Guide, Doc. # 001-93731 Rev. *A 103
Hardware
5.1.9 Cypress Ferroelectric RAM (F-RAM)
The baseboard contains an F-RAM device (FM24V10) (see Figure 5-17) that can be accessed
through I
2
C lines P5[0] and P5[1] of the PSoC 4 BLE/PRoC BLE device. The F-RAM is 1-Mbit
(128 KB) with an I
2
C speed up to 1 Mbps. The I
2
C slave address of the F-RAM device is seven bits
wide, and the LSB two bits are configurable through physical pins and are hardwired to 00 on the
board. By default, the address of the F-RAM device used on the board is 0x50. This address can be
modified by changing the R32/R36 and R33/R37 pairs. The operating voltage range of the F-RAM is
between 2 V and 3.6 V. To prevent the application of 5 V from the adjustable LDO regulator on the
board, a MOSFET based protection circuit similar to the one used for the 3.3-V rail is connected
between the output of the regulator and the VDD pin of the F-RAM. The protection circuit cuts off the
power to the F-RAM when the output of the regulator is greater than 3.6 V.
Figure 5-17. Schematics and Board Highlight of F-RAM