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SWRS224A – FEBRUARY 2019 – REVISED AUGUST 2019
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Detailed Description
Copyright © 2019, Texas Instruments Incorporated
6.6
FIPS 140-2 Level 1 Certification
The Federal Information Processing Standard (FIPS) Publication 140-2 is a U.S. government computer
security standard. It is commonly referred to as FIPS 140-2, and is used to accredit the design and
implementation of cryptographic functions, for example within a chip. A cryptographic function within a chip
security system is necessary to maintain the confidentiality and integrity of the information that is being
processed.
The security functions of the CC3235x chip that is inside the CC3235MODx module, are FIPS certified to
FIPS 140-2 level 1. This certification covers topics such as: cryptographic specifications, ports and
interfaces, a finite state model for the cryptographic functions, the operational environment of the function,
and how cryptographic keys are managed. The certification provides the assurance that the
implementation meets FIPS 140-2 level 1 standards.
6.7
Power-Management Subsystem
The CC3235MODx power-management subsystems contain DC/DC converters to accommodate the
differing voltage or current requirements of the system.
The CC3235MODx MCU is a fully integrated module-based WLAN radio solution used on an embedded
system with a wide-voltage supply range. The internal power management, including DC/DC converters
and LDOs, generates all of the voltages required for the module to operate from a wide variety of input
sources. For maximum flexibility, the module can operate in the modes described in the following sections.
6.7.1
VBAT Wide-Voltage Connection
In the wide-voltage battery connection, the module can be directly connected to two AA alkaline batteries.
All other voltages required to operate the module are generated internally by the DC/DC converters. This
scheme is the most common mode for the module because it supports wide-voltage operation from 2.3 to
3.6 V.
6.8
Low-Power Operating Mode
From a power-management perspective, the CC3235MODx MCU comprises the following two
independent subsystems:
•
Arm
®
Cortex
®
-M4 application processor subsystem
•
Networking subsystem
Each subsystem operates in one of several power states.
The Arm
®
Cortex
®
-M4 application processor runs the user application loaded from an internal Serial Flash,
or on-module XIP Flash (in CC3235MODSF). The networking subsystem runs preprogrammed TCP/IP
and Wi-Fi data link layer functions.
The user program controls the power state of the application processor subsystem and can be in one of
the five modes described in
