CC2640_15 Datasheet, PDF (30/51 Pages) Texas Instruments – CC2640 SimpleLink Bluetooth Smart Wireless MCU

CC2640
SWRS176 – FEBRUARY 2015
www.ti.com
The AON domain contains circuitry that is always enabled, except for in Shutdown (where the digital
supply is off). This circuitry includes the following:
• The RTC can be used to wake the device from any state where it is active. The RTC contains three
compare and one capture registers. With software support, the RTC can be used for clock and
calendar operation. The RTC is clocked from the 32 kHz RC oscillator or crystal. The RTC can also be
compensated to tick at the correct frequency even when the internal 32 kHz RC oscillator is used
instead of a crystal.
• The battery monitor and temperature sensor are accessible by software and give a battery status
indication as well as a coarse temperature measure.
6.10 System Architecture
Depending on the product configuration, CC26xx can function either as a Wireless Network Processor
(WNP – an IC running the wireless protocol stack, with the application running on a separate MCU), or as
a System-on-Chip (SoC), with the application and protocol stack running on the ARM CM3 core 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.
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