Product Info

10
◎ATSEL0~2 serves to select one of up to eight external antennas connected to
the antenna select component. The selected antenna channel is connected to
the RF_IO pin.
13) Low power comparator input: PB<1>~ PB<7>.
14) ADC GPIO input: PB<0>~ PB<7>, PC<4>~ PC<5>
15) For 24MHz crystal, the load capacitor range supported by design is
7.33pF~12.66pF. If the crystal needs load capacitor of 15pF, two external
capacitors will be required.
16) Do not use PC<7:5> for dynamic applications. It’s highly recommended to use
these IOs in DC applications, e.g. as control or detect lines.
17) Pin drive strength:
◎PA<5:7> and PB<0:3> support drive strength up to 8mA (8mA when “DS”=1,
4mA when “DS”=0); PB<4:7> support drive strength up to 16mA (16mA when
“DS”=1, 12mA when “DS”=0); other GPIOs (PA<0:4>, PC<0:7> and PD<0:7>)
support drive strength up to 4mA (4mA when “DS”=1, 2mA when “DS”=0).
◎“DS” configuration will take effect when the pin is used as output.
4.2 Reference Design
The latest schematic and design examples, bill of material, and layout file are
available from original developer. Contact us for details.
Figure 2: Reference Design