Parts List/Tune Up Info
51
CC2642R
www.ti.com
SWRS194G –JANUARY 2018 – REVISED APRIL 2020
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Product Folder Links: CC2642R
Detailed Description
Copyright © 2018–2020, Texas Instruments Incorporated
The Sensor Controller is an autonomous processor that can control the peripherals in the Sensor
Controller independently of the system CPU. This means that the system CPU does not have to wake up,
for example to perform an ADC sampling or poll a digital sensor over SPI, thus saving both current and
wake-up time that would otherwise be wasted. The Sensor Controller Studio tool enables the user to
program the Sensor Controller, control its peripherals, and wake up the system CPU as needed. All
Sensor Controller peripherals can also be controlled by the system CPU.
NOTE
The power, RF and clock management for the CC2642R device require specific configuration
and handling by software for optimized performance. This configuration and handling is
implemented in the TI-provided drivers that are part of the CC2642R software development
kit (SDK). Therefore, TI highly recommends using this software framework for all application
development on the device. The complete SDK with TI-RTOS (optional), device drivers, and
examples are offered free of charge in source code.
6.13 Clock Systems
The CC2642R device has several internal system clocks.
The 48 MHz SCLK_HF is used as the main system (MCU and peripherals) clock. This can be driven by
the internal 48 MHz RC Oscillator (RCOSC_HF) or an external 48 MHz crystal (XOSC_HF). Radio
operation requires an external 48 MHz crystal.
SCLK_MF is an internal 2 MHz clock that is used by the Sensor Controller in low-power mode and also for
internal power management circuitry. The SCLK_MF clock is always driven by the internal 2 MHz RC
Oscillator (RCOSC_MF).
SCLK_LF is the 32.768 kHz internal low-frequency system clock. It can be used by the Sensor Controller
for ultra-low-power operation and is also used for the RTC and to synchronize the radio timer before or
after Standby power mode. SCLK_LF can be driven by the internal 32.8 kHz RC Oscillator (RCOSC_LF),
a 32.768 kHz watch-type crystal, or a clock input on any digital IO.
When using a crystal or the internal RC oscillator, the device can output the 32 kHz SCLK_LF signal to
other devices, thereby reducing the overall system cost.
6.14 Network Processor
Depending on the product configuration, the CC2642R device can function as a wireless network
processor (WNP - a device running the wireless protocol stack with the application running on a separate
host MCU), or as a system-on-chip (SoC) with the application and protocol stack running on the system
CPU inside the device.
In the first case, the external host MCU communicates with the device using SPI or UART. In the second
case, the application must be written according to the application framework supplied with the wireless
protocol stack.