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PDF SX8722 Data sheet ( Hoja de datos )
| Número de pieza | SX8722 | |
| Descripción | High gain acquisition | |
| Fabricantes | Semtech Corporation | |
| Logotipo |  |
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SX8722
High gain acquisition for sensor interface
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
GENERAL DESCRIPTION
The main function of the SX8722 is to acquire signal from
Wheatstone bridges or single ended sensors.
The input can be a pressure sensor, a GMR or AMR
magnetic sensor, a chemical sensor, a thermistor or a mix of
several of these sensors.
The SX8722 Sensor interface is totally configurable through
an I2C compatible interface.
Several parameters are configurable through this interface
such as alarms or signal post processing.
APPLICATION
Pressure sensing (industrial, altimeter, diving computer)
Chemical sensing (monitoring, security)
Magnetic sensing (compass)
ORDERING INFORMATION
Part Number
Temperature Range
SX8722I070LF
-40°C to 125°C
Package
MLPQ44-7x7
Tools
Evaluation Kit
Part number
XE8000EV120
KEY PRODUCT FEATURES
16 + 10 bits differential acquisition
Preamplifier programmable gain up to 1000
Sensor offset compensation up to 15 times full scale of
input signal
4 differential or 7 single ended signal inputs
2 differential reference inputs
I2C compatible connection to application
Internal RC and 32 kHz Oscillators
Low power modes
- Sleep
- Shutdown
4 Full configuration pre selections including:
- ZoomingADC™ configuration
- 2 alarms with on & off thresholds
- Digital filtering
I2C EEPROM interface
Stand alone mode for alarm monitoring
Clock out pin
Calibration pin
Reset pin
Ready / Busy pin
Differential
Single ended
SX8722
BIAS
AR1P
AR1N
AR2P
AR2N
ZoomingADCTM
AC7
AC6
AC5
AC4
PGA
ADC
AC3
AC2
AC1
AC0
Example of application
Typical pressure & temperature sensing
application with sleep control
ACS - Revision 4.2
©2008 Semtech Corp.
October 2008
POST-PROCESS
Page 1
CONTROL
I2C
OSC
POWER
VBATT
GND
ALRM1
ALRM2
CAL
RESET
READY
SCL
SDA
XIN
XOUT
CKOUT
SLEEP
SHUT
VREG
VMULT
VBATT
MCU
GPIO
GPIO
GPIO
www.semtech.com
1 page  
SX8722
High gain acquisition for sensor interface
ADVANCED COMMUNICATIONS & SENSING
Table of contents
DATASHEET
Section
Page
13. Typical performances ............................................................................................................................................ 75
13.1. Current consumption...................................................................................................................................... 75
13.2. ZoomingADC ................................................................................................................................................. 76
13.2.1. Integral non-linearity ............................................................................................................................... 76
13.2.2. Differential non-linearity ......................................................................................................................... 77
13.2.3. Resolution vs acquisition time................................................................................................................. 78
14. Register Memory Map and Description ................................................................................................................. 79
14.1. Memory Map .................................................................................................................................................. 79
14.2. Register description ....................................................................................................................................... 82
14.2.1. SX8722 general configuration................................................................................................................. 82
14.2.2. Configuration 1 registers......................................................................................................................... 84
14.2.3. Configuration 2 registers......................................................................................................................... 88
14.2.4. Configuration 3 registers......................................................................................................................... 92
14.2.5. Configuration 4 registers......................................................................................................................... 96
15. Power modes....................................................................................................................................................... 100
15.1. Power modes transitions.............................................................................................................................. 100
15.2. Active mode ................................................................................................................................................. 101
15.2.1. Description ............................................................................................................................................ 101
15.2.2. How to set SX8722 in active mode ....................................................................................................... 101
15.3. Sleep mode.................................................................................................................................................. 101
15.3.1. Description ............................................................................................................................................ 101
15.3.2. Operating specifications of the sleep mode .......................................................................................... 101
15.3.3. SX8722 sleep current consumption below 3V Vbat.............................................................................. 102
15.3.4. SX8722 sleep current consumption with the 32.768 kHz Xtal .............................................................. 102
15.3.5. SX8722 sleep current consumption without the 32.768 KHz Xtal......................................................... 102
15.3.6. How to set SX8722 in sleep mode........................................................................................................ 102
15.3.7. Wake up from sleep mode to active mode............................................................................................ 102
15.4. Shutdown mode ........................................................................................................................................... 103
15.4.1. Description ............................................................................................................................................ 103
15.4.2. Operating specifications in shutdown mode ......................................................................................... 103
15.4.3. How to set SX8722 in shutdown mode ................................................................................................. 103
15.4.4. Wake-up from shutdown mode to active mode..................................................................................... 104
15.4.5. Change from shutdown mode to sleep mode ....................................................................................... 104
16. PCB Layout Considerations................................................................................................................................. 105
17. How to Evaluate................................................................................................................................................... 105
18. Package Outline Drawing: MLPQ44-7x7mm ....................................................................................................... 105
19. Land Pattern Drawing: MLPQ44-7x7mm............................................................................................................. 106
20. Tape and Reel Specification................................................................................................................................ 107
ACS - Revision 4.2
©2008 Semtech Corp.
October 2008
Page 5
www.semtech.com
5 Page 
SX8722
ADVANCED COMMUNICATIONS & SENSING
3. Pin Description
High gain acquisition for sensor interface
DATASHEET
Pin Symbol
1 NC
2 SLEEP
Type
Digital input
3 SHUT
Digital input
4 READY
5 NC
6 NC
7 NC
8 BIAS
Digital output
Digital output
9 EE_POW
10 EE_SDA
Digital output
Digital IO
11 EE_SCL
Digital IO
12 ALRM1
Digital output
13 ALRM2
Digital output
14 CKOUT
15 NC
16 SCL
17 SDA
18 NC
19 NC
20 NTEST
21 AR2P
22 AR2N
23 AC7
Digital output
Digital IO
Digital IO
Digital input
Analog input
Analog input
Analog input
Function
Status at POR
Not connected
Setting this pin to 0 puts the SX8722 in sleep mode, power Internal pull-up
consumption ~1.5uA, otherwise the pin can be floating
Setting this pin to 0 puts the SX8722 in shutdown mode,
Internal pull-up
power consumption ~0.5uA, otherwise the pin can be floating
Is high when a measurement data is available
Low
Not connected
Not connected
Not connected
Bias pin, is set to VBAT voltage when a measurement is
performed
Low
Must be used to power the optional I2C EEPROM
Low
Must be connected to SDA pin of the optional EEPROM
when used. Otherwise must remain floating (see chapter
EEPROM connection)
Low
Must be connected to SCL pin of the optional EEPROM
when used. Otherwise must remain floating (see chapter
EEPROM connection)
Low
Alarm1 pin, is high when "on" threshold is reached and low
when "off" threshold is reached, when not used can reamin
floating
Low
Alarm2 pin, is high when "on" threshold is reached and low
when "off" threshold is reached, when not used can reamin
floating
Low
System clock output
Low
Not connected
Serial clock line of the I2C compatible interface
Input
Serial data line of the I2C compatible interface
Input
Not connected
Not connected
Must be connected to VBAT
Second analog input reference (positive input)
Second analog input reference (negative input)
ZoomingADCTM input 7
ACS - Revision 4.2
©2008 Semtech Corp.
October 2008
Page 11
www.semtech.com
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet SX8722.PDF ] | |
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