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SX8723 Datasheet(PDF) 11 Page - Semtech Corporation |
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SX8723 Datasheet(HTML) 11 Page - Semtech Corporation |
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11 / 53 page  ADVANCED COMMUNICATIONS & SENSING V1.5 © 2007 Semtech Corp. www.semtech.com 11 SX8723 ZoomingADC™ for Pressure and Temperature 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. 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 4 th and 5 th 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 1 st 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. RegOut[4] RegOut[5] RegOut[0] RegIn[0] RegOut[1] RegIn[1] V REF + - D1/REF IN D0/REF OUT RegMode[0] 0 1 RegMode[1] 0 1 0 1 ZoomingADC |
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