Sensor Controller - Texas Instruments SimpleLink CC2640 Manual

CC2640
SWRS176 – FEBRUARY 2015
6.4

Sensor Controller

The Sensor Controller contains circuitry that can be selectively enabled in standby mode. The peripherals
in this domain may 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 main CM3 CPU.
The Sensor Controller is set up using a PC-based configuration tool, called Sensor Controller Studio, and
typical use cases may be (but are not limited to):
• Analog sensors using integrated ADC
• Digital sensors using GPIOs and bit-banged I
• UART communication for sensor reading or debugging
• Capacitive sensing
• Waveform generation
• Pulse counting
• Keyboard scan
• Quadrature decoder for polling rotation sensors
• Oscillator calibration
The peripherals in the Sensor Controller include the following:
• The low-power clocked comparator can be used to wake the device from any state in which the
comparator is active. A configurable internal reference 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 will take
care of baseline tracking, hysteresis, filtering and other related functions.
• The ADC is a 12-bit, 200 ksamples/s ADC with 8 inputs and a built-in voltage reference. The ADC can
be triggered by many different sources, including timers, I/O pins, software, the analog comparator,
and the RTC.
• The Sensor Controller also includes a SPI/I
• The analog modules can be connected to up to 8 different GPIOs.
The peripherals in the Sensor Controller can also be controlled from the main application processor.
26 Detailed Description
2
C and/or SPI
2
C digital interface.
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