CC3220 Datasheet, PDF (34/84 Pages) Texas Instruments – SimpleLink Wi-Fi Wireless and Internet-of-Things Solution, a Single-Chip Wireless MCU

CC3220
SWAS035A – SEPTEMBER 2016 – REVISED FEBRUARY 2017
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4.12 WLAN Filter Requirements
The device requires an external band-pass filter to meet the various emission standards, including FCC.
Table 4-2 presents the attenuation requirements for the band-pass filter. TI recommends using the same
filter used in the reference design to ease the process of certification.
Table 4-2. WLAN Filter Requirements
PARAMETER
FREQUENCY (MHz)
MIN
TYP
MAX
UNIT
Return loss
Insertion loss⁽¹⁾
2412 to 2484
2412 to 2484
10
dB
1
1.5
dB
800 to 830
30
45
1600 to 1670
20
25
3200 to 3300
30
48
4000 to 4150
45
50
Attenuation
4800 to 5000
20
25
dB
5600 to 5800
20
25
6400 to 6600
20
35
7200 to 7500
35
45
7500 to 10000
20
25
Reference impendence
Filter type
2412 to 2484
Bandpass
50
Ω
(1) Insertion loss directly impacts output power and sensitivity. At customer discretion, insertion loss can be relaxed to meet attenuation
requirements.
4.13 Thermal Resistance Characteristics for RGK Package
AIR FLOW
PARAMETER
0 lfm (C/W)
150 lfm (C/W)
θ_ja
23
14.6
Ψ_jt
0.2
0.2
Ψ_jb
2.3
2.3
θ_jc
6.3
θ_jb
2.4
250 lfm (C/W)
12.4
0.3
2.2
500 lfm (C/W)
10.8
0.1
2.4
4.14 Timing and Switching Characteristics
4.14.1 Power Supply Sequencing
For proper operation of the CC3220x device, perform the recommended power-up sequencing as follows:
1. Tie VBAT (pins 37, 39, 44) and VIO (pins 54 and 10) together on the board.
2. Hold the RESET pin low while the supplies are ramping up. TI recommends using a simple RC circuit
(100 K ||, 1 µF, RC = 100 ms).
3. For an external RTC, ensure that the clock is stable before RESET is deasserted (high).
For timing diagrams, see Section 4.14.3.
34
Specifications
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