SX8724C View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
'SX8724C' PDF : 67 Pages View PDF
SX8724C
ZoomingADC for sensing data acquisition
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
6 General Description
The SX8724C is a complete low-power acquisition path with programmable gain, acquisition speed and resolution.
6.1 Bloc diagram
SX8724C
+
-
+
+
VREF -
-
VBATT
ZoomingADCTM
AC0
AC1
AC2
AC3
PGA
ADC
AC4
AC5
AC6
AC7
READY
CONTROL LOGIC
D0
D1
D2
GPIO
CHARGE
PUMP
4MHz
OSC
I2C
SCL
SDA
D3
VPUMP
VSS
Figure 3. SX8724C bloc diagram
6.2 VREF
The internally generated VREF is a trimmed bandgap reference with a nominal value of 1.22V that provides a stable
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 VBATT voltages of 3V and above. As VBATT drops down to 2.4V, the
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 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
Revision 1.01
© Semtech
January 2011
Page 14
www.semtech.com/products/
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