CC2545_15 Datasheet, PDF (22/31 Pages) Texas Instruments – System-on-Chip for 2.4-GHz RF Applications

CC2545
SWRS106B – JUNE 2012 – REVISED FEBRUARY 2013
APPLICATION INFORMATION
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APPLICATION INFORMATION
Few external components are required for the operation of the CC2545. A typical application circuit is shown in
Figure 19. For suggestions of component values other than those listed in Table 3, see reference design
CC2545EM. The performance stated in this data sheet is only valid for the CC2545EM reference design. To
obtain similar performance, the reference design should be copied as closely as possible.
2.0V-3.6V
Power Supply
Optional32-kHz Crystal
C421
XOSC32K_Q1
XOSC32K_Q1
1 P3_3
2 P3_2
3 P3_1
4 P3_0
5 P2_3
6 P2_2
7 P2_1
8 P2_0
9 P0_7
10 P0_6
11 P0_5
12 P0_4
CC2545
DIE ATTACH PAD:
P1_6 36
RBIAS 35
VDD 34
VDD 33
VSS 32
RF_N 31
RF_P 30
VSS 29
VDD 28
XOSC_Q2 27
XOSC_Q1 26
VDD 25
R351
Antenna
(50 Ohm)
C261
C271
Power supply decoupling capacitors are not shown
Digital I/O not connected
Figure 19. CC2545 Application Circuit
Table 3. Overview of External Components (Excluding Balun, Crystal and Supply Decoupling Capacitors)
Component
C421
R351
Description
Decoupling capacitor for the internal 1.8V 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, CC2545EM,
for recommended balun.
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