sx8723s Semtech Corporation, sx8723s Datasheet - Page 13
sx8723s
Manufacturer Part Number
sx8723s
Description
Zoomingadc For Sensing Data Acquisition
Manufacturer
Semtech Corporation
Datasheet
1.SX8723S.pdf
(68 pages)
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Revision 1.0
© Semtech
6 General Description
The SX8723S is a complete low-power acquisition path with programmable gain, acquisition speed and resolution.
6.1 Bloc diagram
6.2 VREF
The internally generated V
voltage reference for the ZoomingADC.
This reference voltage is directly connected to one of the ZoomingADC reference multiplexer inputs.
The bandgap voltage stability is only guaranteed for V
bandgap voltage could reduce by up to 50mV.
The bandgap has relatively weak output drive so it is recommended that if the bandgap is required as a signal input
then PGA1 must be enabled with gain = 1.
6.3 GPIO
The GPIO block is a multipurpose 2 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
ADVANCED COMMUNICATIONS & SENSING
D0/VREF
D1/VREF
AC2
AC3
AC4
AC5
OUT
IN
SX8723S
February 2011
REF
V
REF
is a trimmed bandgap reference with a nominal value of 1.22V that provides a stable
+
-
AC0
AC1
+
+
-
-
GPIO
Figure 4. SX8723S bloc diagram
PGA
CHARGE
PUMP
CONTROL LOGIC
Page 13
BATT
voltages of 3V and above. As V
ZoomingADC
4MHz
OSC
ZoomingADC for sensing data acquisition
ADC
SPI
TM
BATT
drops down to 2.4V, the
MISO/READY
SX8723S
READY
VPUMP
VBATT
SCLK
MOSI
VSS
SS
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