GND

SCL

SDA

NC

P1_5

DVDD2

P1_1

P1_2

P1_3

P1_4

2-V to 3.6-V Power Supply

R301

XTAL1

C221

C231

C321

C331

C401

32-kHz Crystal

(1)

CC2541

DIE ATTACH PAD

RBIAS

AVDD4

AVDD1

AVDD2

RF_N

AVDD5

XOSC_Q1

XOSC_Q2

AVDD3

RF_P

Antenna

(50

)

W

1

2

3

4

5

6

7

8

9

10

21

22

23

24

25

26

27

28

29

30

Power Supply Decoupling Capacitors are Not Shown

Digital I/O Not Connected

CC2541

SWRS110D – JANUARY 2012 – REVISED JUNE 2013

www.ti.com

APPLICATION INFORMATION

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

Figure 22.

(1) 32-kHz crystal is mandatory when running the BLE protocol stack in low-power modes, except if the link layer is in

the standby state (Vol. 6 Part B Section 1.1 in [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)

Component

Description

Value

C401

Decoupling capacitor for the internal 1.8-V digital voltage regulator

1 µF

R301

Precision resistor ±1%, used for internal biasing

56 k

Ω

Input/Output Matching

When using an unbalanced antenna such as a monopole, a balun should be used to optimize performance. The

balun can be implemented using low-cost discrete inductors and capacitors. See reference design, CC2541EM,

for recommended balun.

24

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