SX8724C Datasheet, PDF (15/67 Pages) Semtech Corporation – ZoomingADC for sensing data acquisition

SX8724C
ZoomingADC for sensing data acquisition
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
reference voltage (For further details see Figure 6, Figure 7, Figure 8 and Figure 9). Each port terminal can be
individually selected as digital input or output.
RegOut[4]
0
D0/VREFOUT
1
RegMode [1]
Internal
Bandgap
reference
V_BG
+
-
1.22V
0
V_REF
1
D1/VREFIN
RegMode [0] _RegOut[5]
1
0
Figure 4. GPIO bloc diagram
RegOut[0]
RegIn[0]
ZoomingADC
RegOut [1]
RegIn [1]
RegOut [6]
RegOut [2]
D2
RegIn [2]
RegOut [7]
RegOut [3]
D3
RegIn [3]
Figure 5. Digital IO bloc diagram
The direction of each bit within the GPIO block (input only or input/output) can be individually set using the bits of the
RegOut (address 0x40) 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 (address 0x41) 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.
Revision 1.01
© Semtech
January 2011
Page 15
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