CC2541-Q1 Datasheet, PDF (24/35 Pages) Texas Instruments – SimpleLink Bluetooth Low Energy Wireless MCU for Automotive

CC2541-Q1
SWRS128 – JUNE 2014
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6 Application Information
Few external components are required for the operation of the CC2541-Q1. A typical application circuit is
shown in Figure 6-1.
2 V±3.6 V
Power Supply
C401
Optional 32-kHz Crystal⁽¹⁾
C331
C321
1 GND
2 SCL
3 SDA
4 GND
5 P1_5
6 P1_4
7 P1_3
8 P1_2
9 P1_1
10 DVDD2
CC2541Q1
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
C251
C261
L251
C252
L261
L252
Antenna
(50 )
L253
C262
C253
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.
Power supply decoupling capacitors are not shown. Digital I/O not connected
Figure 6-1. CC2541-Q1 Application Circuit
Table 6-1. 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
6.1 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, CC2541-Q1EM, for recommended balun.
6.2 Crystal
24
Application Information
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