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DS1923
iButton Hygrochron Temperature/Humidity
Logger with 8KB Data-Log Memory
Latest Humidity Conversion Result Register Bitmap
ADDRESS
020Eh
020Fh
BIT 7
H3
H11
BIT 6
H2
H10
BIT 5
H1
H9
BIT 4
H0
H8
BIT 3
X
H7
BIT 2
X
H6
BIT 1
X
H5
BIT 0
X
H4
BYTE
HRL
HRH
During a mission, if humidity logging is enabled, the
HRH byte (H11 to H4) is always recorded. The HRL
byte is only recorded if the DS1923 is set up for 16-bit
humidity logging. The logging mode (8-bit or 16-bit) is
selected through the HLFS bit at the Mission Control
register, address 0213h.
16-BIT MODE, HLFS = 1
IVAL = (HRH x 256 + HRL)/16
Round IVAL down to the nearest integer; this eliminates the
undefined 4 bits of HRL.
ADVAL = IVAL x 5.02/4096
With HRH and HRL representing the decimal equivalent
of a humidity reading, the actual humidity is calculated
according to the algorithms shown in the table below.
8-BIT MODE, HLFS = 0
(N/A)
ADVAL = HRH x 5.02/256
HUMIDITY(%RH) = (ADVAL - 0.958)/0.0307
The result is a raw humidity reading that needs to be
corrected to achieve the specified accuracy. See the
Software Correction Algorithm for Humidity section for
further details.
To specify the humidity alarm thresholds, the equation
needs to be resolved to:
ADVAL = HUMIDITY(%RH) x 0.0307 + 0.958
HALM = ADVAL x 256/5.02
Round HALM to the nearest integer.
The HALM value needs to be converted into hexadeci-
mal before it can be written to one of the Humidity Alarm
Threshold registers (Low Alarm address 020Ah; High
Alarm address 020Bh). Independent of the conversion
Table 3. Humidity Conversion Examples
mode (8-bit or 16-bit), only the most significant byte of a
humidity conversion is used to determine whether an
alarm is generated. The alarm thresholds are applied to
the raw humidity readings. Therefore, if software correc-
tion is used, the effect of the software correction is to be
reversed before calculating a humidity alarm threshold.
For example, let the desired alarm threshold be 60%RH.
The 60% threshold may correspond to a raw reading of
65%RH (i.e., before correction). To set a 60%RH (after
correction) threshold, the HALM value then needs to be
calculated for 65%RH.
These examples do not include the effects of software
correction.
MODE
HEX
HRH
DECIMAL
HEX
HRL
DECIMAL
HUMIDITY (%RH)
8-bit
8-bit
B5h
67h
181
103
84.41
34.59
16-bit
16-bit
B5h
67h
181
103
C0h
30h
192
48
84.89
34.70
Table 4. Humidity Alarm Threshold Examples
HUMIDITY (%RH)
65
25
Maxim Integrated
HEX
97h
58h
HALM
DECIMAL
151
88
19
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