PIC16F690DM-PCTLHS Microchip Technology, PIC16F690DM-PCTLHS Datasheet - Page 9

• 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

MEASURED RESULTS
The basic circuits in Figure 3 and Figure 6 were
measured with different R
capacitors were measured to validate the accuracy of
these designs. Then the HS1101LF relative humidity
sensor was measured and compared to another,
calibrated humidity sensor.
The measurements were made on the Humidity Sensor
PICtail™ Demo Board, which is discussed in the user’s
guide (DS51594) [15]. This board is further described
by:
• Order Number: PIC16F690DM-PCTLHS
• Assembly Number: 102-00084R1
FIGURE 7:
Figure 8
between the values read from an HP4285A LCR meter
and the circuit in Figure 6. These measurements were
taken across a range of allowed C
parasitic capacitance C
C
Demo Board [15] turned out to be approximately
0.27 pF.
© 2005 Microchip Technology Inc.
SEN
open; the value for the Humidity Sensor PICtail™
shows
the
V
PAR
INT
measurement
was measured by leaving
INT
and V
values. First, known
SEN
SEN
Waveforms with C
values. The
discrepancy
SEN
Fine Resolution Measurements
The circuit in Figure 6 was measured first; it has the
40 dB attenuation of the square wave. This made it
possible to measure the parasitic capacitance, C
and other small capacitances. The C
0.001 pF / count.
Figure 7 shows the V
the Timer 1 Gate waveform; it shows when the
comparator decides that V
or V
FIGURE 8:
Discrepancy.
= 166 pF.
RH
. C
-10%
10%
-2%
-4%
-6%
-8%
8%
6%
4%
2%
0%
SEN
1.E+00
1p
was 166.0 pF and R
Modified
Circuit
Corrected:
C
B
SEN
PAR
1
C
= 0.09499 pF / count
SEN
= 0.270 pF
waveform across time. T1G is
SEN
Not Corrected
C
1.E+01
SEN
Measurement
10p
has reached either V
(F)
AN1016
INT
SEN
DS01016A-page 9
was 6.65 M .
resolution is
1.E+02
100p
PAR
RL
,