User Manual

6
Functional descriptions
Power: The module is powered by a DC power source from 2.0V to 3.3V. The absolute maximum voltage that
should be applied is 3.6V. VCC and VSUPPLY are connected through a 0Ω resistor on the module. The
power plane is attached directly to VCC. J1 can carry 100mA per pin; J3 can carry 500mA per pin.
Ground: These are attached to the ground plane of the module. J1 can carry 100mA per pin; J3 can carry
500mA per pin.
General I/O: These are bidirectional, CMOS level, digital signals running between VCC and GND.
General I/O / external interrupt: These are bidirectional, CMOS level, digital signals running between VCC
and GND. They can also be configured as external, hardware interrupts.
General I/O / external interrupt / counter in: This is a bidirectional, CMOS level, digital signal running
between VCC and GND. It can be configured as external, hardware interrupt or as an input to a counter.
Analog In: These are analog inputs.
Initialization: These pins are digital inputs and outputs used during the initialization of the module.
Two-wire interface: Both SDA and SCK have 10kΩ pull-ups to VCC. The module acts as the master on the
bus.
UART: Two-wire (RX/TX) or four-wire (RX/TX/CTS/RTS) logic level interface. Runs at 9600 baud, 8 data
bits, no parity, 1 stop bit.
Reset: An active low signal (RESET#) to reset the microcontroller. Used during debug and test of the module.
JTAG Programming: These provide a four wire interface into JTAG controller on the module’s
microcontroller. These are used during debug and test of the module.