SX8723 View Datasheet(PDF) - Semtech Corporation

Part Name

Description

Manufacturer

SX8723

ZoomingADC™ for Pressure and Temperature Sensing

Semtech Corporation 

SX8723

ZoomingADC™ for Pressure and Temperature Sensing

ADVANCED COMMUNICATIONS & SENSING

GPIO

The GPIO block is a multipurpose 4 bit input/output port. In addition to digital behavior, D0 and D1 pins can be

programmed as analog pins in order to be used as output (reference voltage monitoring) and input for an

external reference voltage (For further details see Figure 14, Figure 15, Figure 16 and Figure 17). Each port

terminal can be individually selected as digital input or output.

RegOut[4]

RegOut[0]

0

D0/REFOUT

1

RegIn[0]

RegMode[1]

+

0

VREF -

1

ZoomingADC

D1/REFIN

RegMode[0] RegOut[5]

1

0

RegOut[1]

RegIn[1]

Figure 4 - GPIO Block Diagram

The direction of each bit within the GPIO block (input only or input/output) can be individually set using the 4th

and 5th bits of the RegOut register. If D[x]_DIR = 1, both the input and output buffer are active on the

corresponding GPIO block pin. If D[x]_DIR = 0, the corresponding GPIO block pin is an input only and the

output buffer is in high impedance. After power on reset the GPIO block pins are in input/output mode

(D[x]_DIR are reset to 1)

The input values of GPIO block are available in RegIn register (read only). Reading is always direct – there is

no debounce function in the GPIO block. In case of possible noise on input signals, an external hardware filter

has to be realized. The input buffer is also active when the GPIO block is defined as output and the effective

value on the pin can be read back.

Data stored in the 1st and 2nd bits of RegOut register are outputted at GPIO block if D[x]_DIR = 1. The default

values after power on reset is low (0).

The digital pins are able to deliver a driving current up to 8 mA.

When the bits VREF_D0_OUT and VREF_D1_IN in the RegMode register are set to 1 the D0 and D1 pins

digital behavior are automatically bypassed in order to either input or output the voltage reference signals.

V1.5 © 2007 Semtech Corp.

11

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