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Programmable Gain Amplifier (PGA)
AN248: Interfacing MCP6S2X PGAs to PIC
Microcontrollers
This application note shows how to program the six channel
MCP6S26 PGA gains, channels and shutdown registers
using the PIC16C505 microcontroller.
AN865: Sensing Light with a Programmable Gain Amplifier
This application notes discusses how Microchip’s
Programmable Gain Amplifiers (PGAs) can be effectively
used in position photo sensing applications minus the
headaches of amplifier stability.
AN897: Thermistor Temperature Sensing with MCP6SX2
PGAs
Shows how to use a Programmable Gain Amplifier (PGA) to
linearize the response of a thermistor, and to achieve a wider
temperature measurement range.
Temperature Sensing
AN929: Temperature Measurement Circuits for Embedded
Applications
This application note shows how to select a temperature
sensor and conditioning circuit to maximize the
measurement accuracy and simplify the interface to the
microcontroller.
AN981: Interfacing a MCP9700 Analog Temperature
Sensor to a PIC Microcontroller
Analog output silicon temperature sensors offer an easy-
to-use alternative to traditional temperature sensors, such
as thermistors. The MCP9700 offers many system-level
advantages, including the integration of the temperature
sensor and signal-conditioning circuitry on a single chip.
Analog output sensors are especially suited for embedded
systems due to their linear output. This application note
will discuss system integration, firmware implementation
and PCB layout techniques for using the MCP9700 in an
embedded system.
AN988: Interfacing a MCP9800 I 2 C ? Digital Temperature
Sensor to a PIC Microcontroller
This application note will discuss system integration,
firmware implementation and PCB layout techniques for
using the MCP9800 in an embedded system.
AN1001: IC Temperature Sensor Accuracy Compensation
with a PIC Microcontroller
This application note derives an equation that describes
the sensor’s typical non-linear characteristics, which can be
used to compensate for the sensor’s accuracy error over the
specified operating temperature range.
AN1154: Precision RTD Instrumentation for Temperature
Sensing
Precision RTD (Resistive Temperature Detector)
instrumentation is key for high performance thermal
management applications. This application note shows
how to use a high resolution Delta-Sigma Analog-to-
Digital converter, and two resistors to measure RTD
resistance ratiometrically. A ±0.1°C accuracy and ±0.01°C
measurement resolution can be achieved across the RTD
temperature range of -200°C to +800°C with a single point
calibration.
AN1306: Thermocouple Circuit Using MCP6V01 and
PIC18F2550
This application note shows how to use a difference
amplifier system to measure electromotive force (EMF)
voltage at the cold junction of thermocouple in order to
accurately measure temperature at the hot junction. This
can be done by using the MCP6V01 auto-zeroed op amp
because of its extremely low input offset voltage (V OS )
and very high common mode rejection ratio (CMRR).
The microcontroller PIC18F2550 used in this circuit
has internal comparator voltage reference (CV REF ). This
solution minimizes cost by using resources internal to the
PIC18F2550 to achieve reasonable resolution without an
external ADC.
22
Signal Chain Design Guide
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