Automotive Bluetooth 4.0 SoC with integrated MCU — the AEC-Q100 differentiator
The Texas Instruments CC2541F256TRHARQ1 is a single-chip Bluetooth 4.0 transceiver with an integrated 8051-compatible MCU, purpose-built for automotive applications.
RF link budget and data rate — what the sensitivity and output power mean for range
With a -94 dBm receiver sensitivity and 0 dBm transmit output power, this part delivers a link budget around 94 dB — enough for reliable communication across a vehicle cabin or between body modules at typical automotive distances. The 2 Mbps maximum data rate supports Bluetooth 4.0's enhanced data rate (EDR) for faster firmware updates or sensor data streaming. Modulation options include GFSK and MSK, covering both basic rate and EDR modes.
Supply range and current consumption — sizing the power rail
Receive current sits between 18.3 mA and 20.8 mA; transmit current ranges from 17.2 mA to 18.6 mA. These numbers are tight enough that a 150 mA LDO can supply the chip plus a few external sensors without headroom issues.
GPIO and serial interfaces — peripheral integration without an external MCU
Twenty-three GPIOs and I²C, SPI, and USART serial interfaces mean this SoC can directly manage sensors, actuators, and displays without a separate host microcontroller. For a typical automotive BLE sensor module — temperature, pressure, or door-lock status — the CC2541F256TRHARQ1 handles the radio stack and the application logic in one package, saving board space and BOM cost.
Package and footprint — 40-VQFN with exposed pad
The supplier device package is 40-VQFN (6x6).