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PGA900_15

更新时间： 2024-12-01 01:08:19
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PGA900 Programmable Resistive Sensing Conditioner with Digital and Analog Outputs

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Sample &  
Buy  
Support &  
Community  
Product  
Folder  
Tools &  
Software  
Technical  
Documents  
PGA900  
SLDS209A –JANUARY 2015–REVISED MAY 2015  
PGA900 Programmable Resistive Sensing Conditioner with Digital and Analog Outputs  
1 Features  
–
Inter-Integrated Circuit (I2C)  
•
•
Depletion MOSFET Gate Driver  
Diagnostic Functions  
1
•
•
•
High Accuracy, Low Noise, Low Power, Small  
Size Resistive Sensing Signal Conditioner  
User-Programmable Temperature and  
Nonlinearity Compensation  
On-Chip ARM® Cortex® M0 Microprocessor  
Allows Users to Develop and Implement  
Calibration Software  
2 Applications  
•
•
•
•
Pressure Sensor Transmitter, Transducer  
Liquid Level Meter, Flow Meter  
Weight Scale, Load Meter, Strain Gauge  
•
•
One-Wire Interface Enables the Communication  
through Power Supply Pin Without Using  
Additional Lines  
Thermocouple, Thermistor, and 2-Wire Resistance  
Thermometer (RTD)  
•
Resistive Field Transmitter  
On-Chip Power Management Accepts Wide  
Power Supply Voltage from 3.3 V to 30 V  
3 Description  
•
•
Operating Temperature Range: –40°C to 150°C  
Memory  
The PGA900 is a signal conditioner for resistive  
sensing applications. It can accommodate various  
sensing element types. The PGA900 conditions its  
input signals by amplification and digitization through  
two analog front end channels. With the user  
programmed software in the on-chip ARM Cortex M0  
processor, the PGA900 can perform linearization,  
temperature compensation, and other user defined  
compensation algorithms. The conditioned signal can  
be output as ratiometric voltage, absolute voltage, 4-  
to 20-mA current loop or PWM. The data and  
configuration registers can also be accessed through  
SPI, I2C, UART, and two GPIO ports. In addition, the  
unique OWI allows communication and configuration  
through the power supply pin without using additional  
lines. The PGA900 operating voltage is from 3.3 to 30  
V and it can operate in temperatures from –40°C to  
150°C.  
–
–
–
8 KB Software Memory  
128 Bytes EEPROM  
1 KB Data SRAM  
•
•
Accommodates Sensor Sensitivities from 1 mV/V  
to 135 mV/ V  
Two Individual Analog-Front End (AFE) Chains,  
each Including:  
–
–
Low Noise Programmable Gain Amplifier  
24-bit Sigma-Delta Analog-to-Digital Converter  
•
Built-in Internal Temperature Sensor With Option  
to Use External Temperature Sensor  
•
•
14-bit DAC With Programmable Gain Amplifier  
Output Options:  
–
–
–
–
–
Ratiometric and Absolute Voltage Output  
4- to 20-mA Current Loop Interface  
One-Wire Interface (OWI) Over Power Line  
PWM Output  
Device Information(1)  
PART NUMBER  
PACKAGE  
BODY SIZE (NOM)  
PGA900  
VQFN (36)  
6.00 mm x 6.00 mm  
(1) For all available packages, see the orderable addendum at  
the end of the data sheet.  
Serial Peripheral Interface (SPI)  
PGA900 Simplified Block Diagram  
PGA900  
POWER MANAGEMENT  
EEPROM  
RATIOMETRIC  
BRIDGE EXCITATION  
VBRGP  
REFERENCE  
VDD  
(3.3 ± 30 V)  
BRIDGE  
SENSOR  
OWI  
VINPP  
VINPN  
SOFTWARE  
AND DATA  
MEMORY  
MISO/TX,  
MOSI/RX,  
CSN, SCK  
SPI,  
UART  
24-bit  
ADC  
PGA  
I2C  
SCL, SDA  
RESISTIVE SENSING AFE  
TOPDIG,  
TONDIG  
CONTROL  
AND  
STATUS  
REGISTERS  
VBRGN  
PWM  
VOUT  
OR GAIN  
VINTP  
VINTN  
24-bit  
ADC  
14-bit  
DAC  
PGA  
TEMPERATURE SENSING AFE  
INTERNAL  
OSCILLATOR  
ARM  
CORTEX M0  
(PROGRAMMABLE  
BY USERS)  
OPTIONAL  
INTERNAL  
TEMPERATURE  
SENSOR  
DIAGNOSTICS  
EXTERNAL  
TEMPERATURE  
SENSOR  
SWDIO,  
SWDCLK  
DEBUGGER  
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,  
intellectual property matters and other important disclaimers. PRODUCTION DATA.  
 
 
 
 
 
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