PIC16F690DM-PCTLHS Microchip Technology, PIC16F690DM-PCTLHS Datasheet - Page 15

• Manufacturer Part Number: PIC16F690DM-PCTLHS
• Description: BOARD DEMO PICTAIL HUMIDITY SNSR
• Manufacturer: Microchip Technology
• Series: PICtail™r

Specifications of PIC16F690DM-PCTLHS

• Sensor Type: Humidity
• Sensing Range: 1 ~ 99% RH
• Interface: Analog
• Voltage - Supply: 5V
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: MCP6291, PIC16F690
• Processor To Be Evaluated: MCP6291 and PIC16F690
• Interface Type: ICSP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: AC162061 - HEADER INTRFC MPLAB ICD2 20PIN
• Sensitivity: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

4.9
4.9.1
The MCP6291/1R/2/3/4/5 op amp can be used in
active-filter applications.
third-order, multiple feedback low-pass filter that can be
used as an anti-aliasing filter.
FIGURE 4-8:
Pass Filter.
This filter, and others, can be designed using
Microchip’s Filter design software. Refer to Section 5.0
“Design Aids”
4.9.2
Figure 4-9
taic mode for high precision. The resistor R converts
the diode current I
is used to limit the bandwidth or to stabilize the circuit
against the diode’s capacitance (it is not always
needed).
FIGURE 4-9:
© 2007 Microchip Technology Inc.
V
light
IN
V
DD
/2
V
Application Circuits
R
DD
I
C
shows a photodiode biased in the photovol-
D
1
MULTIPLE FEEDBACK LOW-PASS
FILTER
PHOTODIODE AMPLIFIER
1
/2
D
to the voltage V
R
MCP6291
3
Multiple Feedback Low-
Photodiode Amplifier.
Figure 4-8
MCP6291
R
C
2
3
C
R
shows an inverting,
OUT
R
. The capacitor
C
4
4
V
OUT
V
OUT
4.9.3
The MCP6295 provides the flexibility of Low-power
mode for dual op amps in an 8-pin package. The
MCP6295 eliminates the added cost and space in
battery-powered applications by using two single op
amps with Chip Select lines or a 10-pin device with one
Chip Select line for both op amps. Since the two op
amps are internally cascaded, this device cannot be
used in circuits that require active or passive elements
between the two op amps. However, there are several
applications where this op amp configuration with
Chip Select line becomes suitable. The circuits below
show possible applications for this device.
4.9.3.1
With the cascaded op amp configuration, op amp B can
be used to isolate the load from op amp A. In applica-
tions where op amp A is driving capacitive or low
resistance loads in the feedback loop (such as an
integrator circuit or filter circuit), the op amp may not
have sufficient source current to drive the load. In this
case, op amp B can be used as a buffer.
FIGURE 4-10:
Buffer.
MCP6291/1R/2/3/4/5
A
CASCADED OP AMP
APPLICATIONS
Load Isolation
MCP6295
Isolating the Load with a
CS
B
DS21812E-page 15
Load
V
OUTB