Datasheet

25
Signal Chain Design Guide
Passive Keyless Entry (PKE)
TB090: MCP2030 Three-Channel Analog Front-End
Device Overview
This tech brief summarizes the technical features of the
MCP2030 and describes how the three channel stand-
alone analog front-end device can be used for various
bidirectional communication applications.
AN1024: PKE System Design Using the PIC16F639
This application note described how to make hands-free
reliable passive keyless entry applications using the
PIC16F639, a dual die solution device that includes both
MCP2030 and PIC16F636.
Op Amps
AN1016: Detecting Small Capacitive Sensors Using
the MCP6291 and PIC16F690 Devices
The circuit discussed here uses an op amp and a
microcontroller to implement a dual slope integrator and
timer. It gives accurate results, and is appropriate for small
capacitive sensors, such as capacitive humidity sensors.
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
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.
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 volt age (Vos)
and very high common mode rejection ratio (CMRR).
The microcontroller PIC18F2550 used in this circuit
has internal comparator voltage reference (CVref). This
solution minimizes cost by using resources internal to the
PIC18F2550 to achieve rea sonable resolution without an
external ADC.
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