The Input/Output Pins (I/O PINS) are for receiving external signals and sending signals out. These general purpose I/Os (GPIOs), can be configured as Analog IO or Digital IO with the exception of PIN2, PIN6, and PIN7. PIN2 can only serve as a digital input or external reset. Pins 6 and 7 are configured as Open Drain NMOS for I2C. PIN6 and PIN7 have no PMOS structure and cannot be configured as a push-pull output.

Activation

Set ‘I/O selection’ to a GPIO mode that is not ‘Pin not Used’.
Alternatively, drag a wire to or from the PIN and a signal.
For Digital Input/Output signals, connect the OE pin to a I/O control signal.

Parameters

I/O selection:

Select PIN mode to Digital IO or Analog IO.

• Pin not used: will default the PIN with a 1MΩ Pull down resistor

• Digital input: OE = 0. See following Digital Input Types.

• Analog input/output

• Digital output: OE = 1. See following Digital Output Types.

• Digital input/output: OE = 0 or 1. See following Digital Input and Digital Output Types.

Input mode OE=0:

Only available for Digital Input or Digital Input/Output modes. The Schmitt Trigger configures the PIN to have hysteresis which rejects fast and spurious signal transitions.

• Digital in without Schmitt trigger

• Digital in with Schmitt trigger

• Low voltage digital input: the voltage threshold which determines HIGH from LOW is lower than in regular Digital input mode. No Schmitt Trigger.

Output mode OE=1:

Available for Digital Output or Digital Input/Output modes.

• 1x push pull

• 2x push pull

• 1x open drain NMOS

• 2x open drain NMOS

• 1x open drain PMOS

• 2x open drain PMOS

Resistor:

Available for both Digital Input and Digital Output modes. All ports are in Hi-Z state until chip is powered up.

• Pull down resistor: Default low

• Pull up resistor: Default high

• Floating: no resistor

Resistor value:

If a Pull up or Pull down resistor is set for ‘Resistor’, select one of the following resistor values.

• 10k strongest pull up/down

• 100k medium pull up/down

• 1M weakest pull up/down

Information

Electrical Specifications

V_IH is the input voltage at digital signal transitions from a low to high.
V_IL is the input voltage at digital signal transitions from a high to low.
V_OH is the output voltage at digital high.
V_OL is the output voltage at digital low.
I_OH is the output current at digital high.
I_OL is the output current at digital low.