sx8725c Semtech Corporation, sx8725c Datasheet - Page 14

• Manufacturer Part Number: sx8725c
• Description: Zoomingadc For Sensing Data Acquisition
• Manufacturer: Semtech Corporation

Revision 1.01
© Semtech
6 General Description
The SX8725C 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.
ADVANCED COMMUNICATIONS & SENSING
(1)
(1)
AC2
AC3
D0
D1
D0: digital IO, Vref output or I2C address select
D1: digital IO, Vref input or I2C address select
January 2011
SX8725C
REF
V
is a trimmed bandgap reference with a nominal value of 1.22V that provides a stable
REF
+
-
AC0
AC1
+
+
-
-
Figure 3. SX8725C bloc diagram
GPIO
Page 14
PGA
CHARGE
BATT
PUMP
CONTROL LOGIC
voltages of 3V and above. As V
ZoomingADC
ZoomingADC for sensing data acquisition
4MHz
OSC
ADC
I
2
C
TM
www.semtech.com/products/
BATT
drops down to 2.4V, the
SX8725C
READY
V
V
SCL
SDA
VSS
DATASHEET
PUMP
BATT