CC2541

Part: CC2541 — Texas Instruments

Type: 2.4-GHz Bluetooth low energy and Proprietary RF System-on-Chip (8051 MCU)

Description: 2.4-GHz Bluetooth low energy / proprietary SoC with an enhanced 8051 MCU, 128 or 256 KB in-system-programmable flash, 8 KB RAM, up to 0 dBm output power, and -94 dBm receiver sensitivity at 1 Mbps (high-gain mode).

Operating Conditions:

• Supply voltage: 2–3.6 V
• Operating ambient temperature: -40 to 85 °C
• RF frequency range: 2379–2496 MHz, programmable in 1-MHz steps
• Data rates: 250 kbps, 500 kbps, 1 Mbps, 2 Mbps

Absolute Maximum Ratings:

• Max supply voltage: 3.9 V (all supply pins must have the same voltage)
• Voltage on any digital pin: -0.3 V to VDD + 0.3 V (≤ 3.9 V)
• Input RF level: 10 dBm
• Storage temperature: -40 to 125 °C
• ESD (HBM, all pins excluding pins 25 and 26): 2 kV; all pins: 1 kV; CDM: 500 V

Key Specs:

• RX current (standard mode): 17.9 mA; high-gain mode: 20.2 mA (TA = 25 °C, VDD = 3 V, 1 Mbps BLE mode)
• TX current: 18.2 mA at 0 dBm; 16.8 mA at -20 dBm
• Power mode 1: 270 μA; power mode 2: 1 μA; power mode 3: 0.5 μA
• Wake-up time: 4 μs (PM1 → active); 120 μs (PM2/3 → active)
• Receiver sensitivity, 1 Mbps GFSK (BLE): -94 dBm high-gain, -88 dBm standard
• Receiver sensitivity: -90 dBm at 2 Mbps (500-kHz deviation); -99 dBm at 500 kbps MSK; -98 dBm at 250 kbps GFSK
• RX/TX turnaround: 150 μs (BLE mode); 130 μs (proprietary auto mode)
• Peripheral current: ADC converting 1.2 mA; Timer 1 90 μA; sleep timer 0.6 μA

Features:

• Bluetooth low energy compliant and proprietary 2.4-GHz RF SoC
• Programmable output power up to 0 dBm
• 128 or 256 KB in-system-programmable flash, 8 KB RAM with retention in all power modes
• Five-channel DMA; one 16-bit and two 8-bit timers; 32-kHz sleep timer
• 12-bit ADC with eight channels; AES security coprocessor
• Two USARTs, I²C interface, watchdog timer, integrated comparator
• 23 GPIO pins (21 × 4 mA, 2 × 20 mA)
• Battery monitor and temperature sensor
• Pin-compatible with CC2540 (when not using USB or I²C)
• Compatible with the TPS62730 step-down converter for lower active-mode current
• BLE v4.0 compliant protocol stack and development tools (CC2541EMK, CC2541DKMINI, SmartRF software)

Applications:

• 2.4-GHz Bluetooth low energy systems
• Proprietary 2.4-GHz systems
• Human-interface devices (keyboard, mouse, remote control)
• Sports and leisure equipment
• Mobile phone accessories
• Consumer electronics

Package:

• 6 mm × 6 mm QFN-40

• 23 · RF

• -2.4-GHz Bluetooth low energy Compliant and Proprietary RF System-on-Chip

• -Supports 250-kbps, 500-kbps, 1-Mbps, 2Mbps Data Rates

• -Excellent Link Budget, Enabling LongRange Applications Without External Front End

• -Programmable Output Power up to 0 dBm

• -Excellent Receiver Sensitivity (-94 dBm at 1 Mbps), Selectivity, and Blocking Performance

• -Suitable for Systems Targeting Compliance With Worldwide Radio Frequency Regulations: ETSI EN 300 328 and EN 300 440 Class 2 (Europe), FCC CFR47 Part 15 (US), and ARIB STD-T66 (Japan)

• Layout

• -Few External Components

• -Reference Design Provided

• -6-mm × 6-mm QFN-40 Package

• -Pin-Compatible With CC2540 (When Not Using USB or I 2 C)

• Low Power

• -Active-Mode RX Down to: 17.9 mA

• -Active-Mode TX (0 dBm): 18.2 mA

• -Power Mode 1 (4-μs Wake-Up): 270 μA

• -Power Mode 2 (Sleep Timer On): 1 μA

• -Power Mode 3 (External Interrupts): 0.5 μA

• -Wide Supply-Voltage Range (2 V-3.6 V)

• TPS62730 Compatible Low Power in Active Mode

• RX Down to: 14.7 mA (3-V supply)

• TX (0 dBm): 14.3 mA (3-V supply)

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• 2.4-GHz Bluetooth low energy Systems
• Proprietary 2.4-GHz Systems
• Human-Interface Devices (Keyboard, Mouse, Remote Control)
• Sports and Leisure Equipment
• Mobile Phone Accessories
• Consumer Electronics
• Extends Battery Lifetime by up to 20%
• Reduced Current in All Active Modes
• 30-nA Bypass Mode Current to Support LowPower Modes
• RF Performance Unchanged
• Small Package Allows for Small Solution Size
• CC2541 Controllable

The CC2541 pinout is shown in Figure 8 and a short description of the pins follows.

NOTE: The exposed ground pad must be connected to a solid ground plane, as this is the ground connection for the chip.

Figure 8. Pinout Top View

Measured on Texas Instruments CC2541 EM reference design with TA = 25°C and VDD = 3 V,

over operating free-air temperature range (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted)

Few external components are required for the operation of the CC2541. A typical application circuit is shown in Figure 22.

(1)

NOTE: Different antenna alternatives will be provided as reference designs.

Figure 22. CC2541 Application Circuit

Table 3. Overview of External Components (Excluding Supply Decoupling Capacitors)