Silicon Labs

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operation. I2C support is compliant with the NXP I2C specification version 2.1 and supports standard mode

(up to 100 kbps) and fast mode (up to 400 kbps). In addition, 7-bit device addressing modes are supported, as

well as master and slave modes..

The ultralow-power analog comparator enables applications to wake up from PM2 or PM3 based on an analog

signal. Both inputs are brought out to pins; the reference voltage must be provided externally. The comparator

output is connected to the I/O controller interrupt detector and can be treated by the MCU as a regular I/O pin

interrupt.

RF front end

RF front end includes balun, power amplifier, low noise amplifier, band pass filter, and a ceramic chip antenna

with matching network. Optimal matching combined with effective low pass filter provides extremely low in-

band spurious emissions and harmonics.