ADC31RF80 datasheet(46/142 Pages) TI2

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GPIO4

GPIO1

GPIO3

GPIO2

INSEL1[1:0]

INSEL0[1:0]

NCO1

NCO2

NCO3

N/A

GPIO4

GPIO1

GPIO3

GPIO2

NCO for DDC0

NCO SEL[1:0]

NCO SEL PIN

ADC31RF80

SBAS860 – AUGUST 2017

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The NCOs can be switched by using the GPIO pins with the register configurations shown in Table 5 or through

an SPI control. The assignment of which GPIO pin to use for INSEL0 and INSEL1 is done based on Table 6,

using register 5438h. The NCO selection, shown in Table 7 and Figure 120, is done based on the logic selection

on the GPIO pins.

Table 5. NCO Register Configurations

ADDRESS

DESCRIPTION

NCO CONTROL THROUGH GPIO PINS

NCO SEL PIN

500Fh

Selects the NCO control through the SPI (default) or a GPIO pin.

INSEL0[1:0], INSEL1[1:0]

5438h

Selects which two GPIO pins are used to control the NCO.

NCO CONTROL THROUGH SPI CONTROL

NCO SEL PIN

500Fh

Selects the NCO control through the SPI (default) or a GPIO pin.

NCO SEL[1:0]

5010h

Selects which NCO to use for DDC0.

Table 6. GPIO Pin Assignment

INSELx[1:0] (Where x = 0 or 1)

GPIO PIN SELECTED

GPIO4

GPIO1

GPIO3

GPIO2

Table 7. NCO Selection

NCO SEL[1:0]

NCO SELECTED

NCO1

NCO2

NCO3

n/a

Figure 120. NCO Switching from GPIO and SPI

ADC31RF80 Datasheet(PDF) 46 Page - Texas Instruments

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