Power; Recommended Values For The Pcb; Power Management - Texas Instruments CC3100 SimpleLink Wi-Fi User Manual

Layout Guidelines
The recommended values for the PCB are provided in
Parameter
W
S
H
Er
(1)
Er is assumed to be of an FR-4 substrate.
5.2

Power

• All of the input de-coupling capacitors (C11, C13, and C18) should be routed on L2 using thick traces
to isolate RF ground from a noisy supply ground. This is also required to meet the IEEE spectral mask
specifications.
• Maintain the thickness of power traces to be higher than 12 mils. Special care should be taken for
power amplifier supply lines (pin 33, 40, 41, and 42) and all input supply pins (pin 37, 39, and 44).
• Ensure shortest grounding loop for PLL supply de-coupling capacitor (pin 24)
• Place all de-coupling capacitors as close as possible to the respective pins.
• Power budget: The CC3X00 device can consume up to 450 mA for 3.3 V, 670 mA for 2.1 V, and 700
mA for 1.85 V for 24 msec during the calibration cycle. Ensure that the power supply is designed to
source this current without any issues. The complete calibration (TX and RX) can take up to 17 mJ of
energy from the battery over a time of 24 ms.
• There are many high-current input pins on the CC3X00 device. Ensure the trace feeding these pins is
capable of handling the following currents:
– PA DCDC input : pin 39. Max 1A
– ANA DCDC input : pin 37 : Max 600 mA
– Dig DCDC input : pin 44: Max 500 mA
– PA DCDC switching nodes : pin 40/41 , Max 1A
– PA DCDC output node: pin 42, Max 1A
– ANA DCDC switching node: pin 38: Max 600 mA
– Dig DCDC switching node: pin 43 : Max 500 mA
– PA supply : pin 33: Max 500mA
5.2.1 Inductors for Power Management
The components used in the power management section of the design are critical to achieve the required
performance. These should be chosen based on the recommendations in
Inductors
PA DC-DC
ANA, DIG DC-DC
16
CC3100 and CC3200 SimpleLink™ Wi-Fi
Layout Guidelines
Table 9. Recommended Values for the PCB
(1)
Table 10. Power Management
Value ESR
min
1 uH
2.2 uH
®
and Internet of Things Solution
Copyright © 2014–2018, Texas Instruments Incorporated
Table 9.
Value
18
15
10
3.9
(mOhm) Rated Current (A)
TBD 1.5
TBD 1.3
SWRU370B – June 2014 – Revised August 2018
www.ti.com
Units
mils
mils
mils
Table 10.
Saturation
Tolerance
Current I
sat
TBD 20%
TBD 20%
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