PGA900_15 Datasheet, PDF (1/138 Pages) Texas Instruments – PGA900 Programmable Resistive Sensing Conditioner with Digital and Analog Outputs

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PGA900
SLDS209A – JANUARY 2015 – REVISED MAY 2015
PGA900 Programmable Resistive Sensing Conditioner with Digital and Analog Outputs
1 Features
•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
• One-Wire Interface Enables the Communication
through Power Supply Pin Without Using
Additional Lines
• On-Chip Power Management Accepts Wide
Power Supply Voltage from 3.3 V to 30 V
• Operating Temperature Range: –40°C to 150°C
• Memory
– 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
– Serial Peripheral Interface (SPI)
– Inter-Integrated Circuit (I²C)
• Depletion MOSFET Gate Driver
• Diagnostic Functions
2 Applications
• Pressure Sensor Transmitter, Transducer
• Liquid Level Meter, Flow Meter
• Weight Scale, Load Meter, Strain Gauge
• Thermocouple, Thermistor, and 2-Wire Resistance
Thermometer (RTD)
• Resistive Field Transmitter
3 Description
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.
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.
PGA900 Simplified Block Diagram
BRIDGE
SENSOR
VBRGP
PGA900
RATIOMETRIC
BRIDGE EXCITATION
VINPP
VINPN
PGA
REFERENCE
24-bit
ADC
VBRGN
VINTP
VINTN
RESISTIVE SENSING AFE
PGA
24-bit
ADC
TEMPERATURE SENSING AFE
OPTIONAL
EXTERNAL
TEMPERATURE
SENSOR
INTERNAL
TEMPERATURE
SENSOR
DIAGNOSTICS
EEPROM
SOFTWARE
AND DATA
MEMORY
CONTROL
AND
STATUS
REGISTERS
POWER MANAGEMENT
OWI
SPI,
UART
I2C
PWM
14-bit
DAC
OR GAIN
ARM
CORTEX M0
(PROGRAMMABLE
BY USERS)
INTERNAL
OSCILLATOR
DEBUGGER
VDD
(3.3 ± 30 V)
MISO/TX,
MOSI/RX,
CSN, SCK
SCL, SDA
TOPDIG,
TONDIG
VOUT
SWDIO,
SWDCLK
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.