The CC2540 is a cost-effective， low-power， true system-on-chip (SoC) for Bluetooth low energy applications。It enables robust BLE master or slave nodes to be built with very low total bill-of-material costs。 The CC2540 combines an excellent RF transceiver with an industry-standard enhanced 8051 MCU， in-system programmable flash memory， 8-KB RAM， and many other powerful supporting features and peripherals。 The CC2540 is suitable for systems where very low power consumption is required。 Very low-power sleep modes are available。Short transition times between operating modes further enable low power consumption。The CC2540 comes in two different versions：CC2540F128/F256， with 128 and 256 KB of flash memory，respectively。Combined with the Bluetooth low energy protocol stack from Texas Instruments， the CC2540F128/F256 forms the market’s most flexible and cost-effective single-mode Bluetooth low energy solution。