Data Sheet

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
XTAL2
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
P1_0
P0_7
P0_6
P0_5
P0_4 RESET_N P0_0
P0_1
P0_2
P0_3
DCOUPL
DVDD1
P1_6
P1_7
P2_0
AVDD6
P2_4/XOSC32K_Q1
P2_3/XOSC32K_Q2
P2_2
P2_1
Antenna
(50 )W
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
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 kΩ
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.
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