PIC16F690DM-PCTLHS Microchip Technology, PIC16F690DM-PCTLHS Datasheet - Page 12

• 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

AN1016
APPENDIX A:
In order to convert C
piecewise linear interpolation table [11]. This table is
designed specifically for Humirel’s HS1101LF relative
humidity sensor [1]. First, the calculated C
limited in range and converted to a 10-bit integer:
EQUATION A-1:
The top 6 bits of CSN are used as a pointer (INTRVL)
to the correct row of the table. The bottom 4 bits of CSN
(CSN – ACSN, interpreted as integers between 0 and
15) are the input to the linear interpolation formula
using the coefficients for the current row. The entries in
the table give errors less than ±0.01%.
EQUATION A-2:
DS01016A-page 12
CSN
RH
X
=
=
=
=
=
A
RHO
max min X, 100% , 0%
0,
1023,
C
----------------------------------------, otherwise
SEN
SEN
+
PIECEWISE LINEAR
INTERPOLATION
TABLE
0.1 pF
A
–
RH1
130.0 pF
C
C
to RH, the firmware uses a
SEN
SEN
CSN ACSN
<
>
130.0 pF
232.3 pF
–
SEN
value is
TABLE A-1:
INTRVL
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
62
63
···
···
0
1
ACSN
1008
HS1101LF COEFFICIENT
LOOKUP TABLE
272
288
304
320
336
352
368
384
400
416
432
448
464
480
496
512
528
544
560
576
592
608
624
640
656
992
16
···
···
0
© 2005 Microchip Technology Inc.
13.75
18.31
23.00
27.84
32.80
37.89
43.09
48.40
53.79
59.26
64.77
70.32
75.88
81.41
86.91
92.33
97.64
A
-3.08
0.92
5.06
9.33
100
100
100
100
(%)
RH0
···
···
0
0
0
0
(% / LSb)
0.250
0.259
0.267
0.276
0.285
0.294
0.302
0.310
0.318
0.325
0.332
0.337
0.341
0.345
0.347
0.347
0.346
0.344
0.339
0.332
0.325
A
RH1
···
···
0
0
0
0
0
0
0
0