SX8722I070LF SEMTECH [Semtech Corporation], SX8722I070LF Datasheet - Page 49

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

11.8.3. Using a 32.768 kHz External clock source
The host microcontroller can at any time send a 32.768kHz signal on CAL pin, the detection of a rising edge on the this pin
initiates a calibration process. When the chip is calibrated, the pin READY rises to high level.
NOTE:
ACS - Revision 4.2
©2008 Semtech Corp.
ADVANCED COMMUNICATIONS & SENSING
If an external EEPROM is present, the calibration value is saved in it.
The tolerance signal must remain around 32.768 kHz +/- 10%
Differential
AR1P
AR1N
AR2P
AR2N
BIAS
AC7
AC6
AC5
AC4
AC3
AC2
AC1
AC0
SX8722
October 2008
Figure 29. Calibration : using a 32’768 Hz signal
PGA
POST-PROCESS
ZoomingADC
ADC
Page 49
TM
High gain acquisition for sensor interface
CONTROL
POWER
OSC
I
2
C
VMULT
ALRM1
ALRM2
RESET
READY
CKOUT
VBATT
SLEEP
VREG
XOUT
SHUT
GND
SDA
CAL
SCL
XIN
32’768 Hz
DATASHEET
www.semtech.com
SX8722
VBATT
GPIO
GPIO
GPIO
SCL
SDA
MCU