SX8722I070LF SEMTECH [Semtech Corporation], SX8722I070LF Datasheet - Page 50

• Manufacturer Part Number: SX8722I070LF
• Description: High gain acquisition for sensor interface
• Manufacturer: SEMTECH [Semtech Corporation]

11.9. Working below 3 V
11.9.1. Operating range
The SX8722 operating range is 5.5 Volts downto 2.4 Volts. However, below 3 Volts the SX8722 enables an internal voltage
multiplier to power the ZoomingADC™.
11.9.2. Internal voltage multiplier
This internal voltage multiplier is automatically enabled when the power supply goes below 3 Volts but the internal voltage
multiplier requires an external capacitor between VMULT pin and ground, the value of this capacitor must be between 1 and
3 nF.
11.9.3. Schematic
The schematic below shows the capacitor connection:
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
Differential
AR1N
AR2N
AR1P
AR2P
AC7
AC6
AC5
AC4
AC3
AC2
AC1
AC0
BIAS
SX8722
October 2008
Figure 30. SX8722 working below 3V schematic
PGA
POST-PROCESS
ZoomingADC
ADC
Page 50
TM
High gain acquisition for sensor interface
CONTROL
POWER
OSC
I
2
C
VMULT
CKOUT
VBATT
ALRM1
ALRM2
RESET
READY
SLEEP
VREG
XOUT
SHUT
GND
CAL
SCL
SDA
XIN
Vbatt < 3V
2 nF
DATASHEET
www.semtech.com
SX8722
VBATT
GPIO
SCL
SDA
GPIO
MCU