User's Manual

GE864

GE864GE864

GE864-

-QUAD Automotive V2 Hardware User Guide

QUAD Automotive V2 Hardware User GuideQUAD Automotive V2 Hardware User Guide

QUAD Automotive V2 Hardware User Guide

1vv0300840 Rev.3 2010-04-08

11.2.

11.2.11.2.

11.2. Using a GPIO Pad as INPUT

Using a GPIO Pad as INPUT Using a GPIO Pad as INPUT

Using a GPIO Pad as INPUT

The GPIO pads, when used as inputs, can be connected to a digital output of another

device and report its status, provided this device has interface levels compatible with

the 2.8V CMOS levels of the GPIO.

If the digital output of the device to be connected with the GPIO input pad has interface

levels different from the 2.8V CMOS, then it can be buffered with an open collector

transistor with a 47K pull up to 2.8V.

11.3.

11.3.11.3.

11.3. Using a GPIO Pad as OUTPUT

Using a GPIO Pad as OUTPUT Using a GPIO Pad as OUTPUT

Using a GPIO Pad as OUTPUT

The GPIO pads, when used as outputs, can drive 2.8V CMOS digital devices or

compatible hardware. When set as outputs, the pads have a push-pull output and

therefore the pull-up resistor may be omitted.

The illustration below shows the base circuit of a push-pull stage:

11.4.

11.4.11.4.

11.4. Using the RF Transmission Control GPIO4

Using the RF Transmission Control GPIO4 Using the RF Transmission Control GPIO4

Using the RF Transmission Control GPIO4

The GPIO4 pin, when configured as RF Transmission Control Input, permits to disable

the Transmitter when the GPIO is set to Low by the application.

In the design is necessary to add a pull up resistor (47K to PWRMON);