Parts List/Tune Up Info

CC2642R

SWRS194G –JANUARY 2018 – REVISED APRIL 2020

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Detailed Description

6.5 Sensor Controller

The Sensor Controller contains circuitry that can be selectively enabled in both Standby and Active power

modes. The peripherals in this domain can be controlled by the Sensor Controller Engine, which is a

proprietary power-optimized CPU. This CPU can read and monitor sensors or perform other tasks

autonomously; thereby significantly reducing power consumption and offloading the system CPU.

The Sensor Controller Engine is user programmable with a simple programming language that has syntax

similar to C. This programmability allows for sensor polling and other tasks to be specified as sequential

algorithms rather than static configuration of complex peripheral modules, timers, DMA, register

programmable state machines, or event routing.

The main advantages are:

• Flexibility - data can be read and processed in unlimited manners while still ensuring ultra-low power

• 2 MHz low-power mode enables lowest possible handling of digital sensors

• Dynamic reuse of hardware resources

• 40-bit accumulator supporting multiplication, addition and shift

• Observability and debugging options

Sensor Controller Studio is used to write, test, and debug code for the Sensor Controller. The tool

produces C driver source code, which the System CPU application uses to control and exchange data

with the Sensor Controller. Typical use cases may be (but are not limited to) the following:

• Read analog sensors using integrated ADC or comparators

• Interface digital sensors using GPIOs, SPI, UART, or I

C (UART and I

C are bit-banged)

• Capacitive sensing

• Waveform generation

• Very low-power pulse counting (flow metering)

• Key scan

The peripherals in the Sensor Controller include the following:

• The low-power clocked comparator can be used to wake the system CPU from any state in which the

comparator is active. A configurable internal reference DAC can be used in conjunction with the

comparator. The output of the comparator can also be used to trigger an interrupt or the ADC.

• Capacitive sensing functionality is implemented through the use of a constant current source, a time-

to-digital converter, and a comparator. The continuous time comparator in this block can also be used

as a higher-accuracy alternative to the low-power clocked comparator. The Sensor Controller takes

care of baseline tracking, hysteresis, filtering, and other related functions when these modules are

used for capacitive sensing.

• The ADC is a 12-bit, 200-ksamples/s ADC with eight inputs and a built-in voltage reference. The ADC

can be triggered by many different sources including timers, I/O pins, software, and comparators.

• The analog modules can connect to up to eight different GPIOs

• Dedicated SPI master with up to 6 MHz clock speed

The peripherals in the Sensor Controller can also be controlled from the main application processor.