CC2541F128RHAR Datasheet, PDF (24/32 Pages) Texas Instruments – 2.4-GHz Bluetooth™ low energy and Proprietary System-on-Chip

CC2541
SWRS110D – JANUARY 2012 – REVISED JUNE 2013
APPLICATION INFORMATION
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Few external components are required for the operation of the CC2541. A typical application circuit is shown in
Figure 22.
32-kHz Crystal⁽¹⁾
2-V to 3.6-V Power Supply
C401
C331
C321
1 GND
2 SCL
3 SDA
4 NC
5 P1_5
6 P1_4
7 P1_3
8 P1_2
9 P1_1
10 DVDD2
CC2541
DIE ATTACH PAD
RBIAS 30
AVDD4 29
AVDD1 28
AVDD2 27
RF_N 26
RF_P 25
AVDD3 24
XOSC_Q2 23
XOSC_Q1 22
AVDD5 21
R301
Antenna
(50 W)
Power Supply Decoupling Capacitors are Not Shown
Digital I/O Not Connected
C221
XTAL1
C231
(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
C401
R301
Description
Decoupling capacitor for the internal 1.8-V digital voltage regulator
Precision resistor ±1%, used for internal biasing
Value
1 µF
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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