GR64 Integrators Manual
Page: 73/104
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5.16.2
LED/IO6 Capabilities
The LED function pin can be used as a general purpose digital I/O when the flashing
LED function is not required. However, this pin does not have an on-board pull-up
resistor. It is required that an external pull-up or pull-down resistor be provided by
the host circuitry when either not used or when used as a digital input.
5.16.3
ADIN4
A further ADC input (in addition to the three dedicated pins) is created by
multiplexing one of the GPIO signals (GPIO5). ADIN4 has a 6dB attenuator built-in to
the Wireless CPU so that it can accommodate an input voltage up to 5.0V.
5.17
Digital to Analogue Converter – DAC [not implemented yet]
Pin
Name
Direction
Function
20
DAC
Output
Pulse width modulated signal
The GPIO15 has dual functionality. In addition of being a fully programmable GPIO it
also has the capability of becoming a PWM output. This PWM can be used as a DAC
by implementing an RC-filter followed by an optional buffer.
Figure 26: Typical arrangement for adapting PWM for a DAC function
