Data Sheet

22
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HTE501
ADDRESS FUNCTION
DEFAULT
VALUE
DESCRIPTION
0x08 Heater settings
0x07
(0000 0111)
5 mA,
Heater off
BIT NAME R/W DESCRIPTION
7 Reserved - -
6:3 CURRENT R/W
Select constant current for heater
I = (CURRENT + 1) * 5 mA
CURRENT = 0...15, I = 5...80 mA
2:0 Constant Current Heater R/W
111 = HEATER OFF
110 = HEATER ON
other = do not use
0x0F
Measurement
resolution
0x2D
(0010 1101)
T = 13 bit
RH = 13 bit
BIT NAME R/W DESCRIPTION
7:6 Reserved - -
5:3 RH_RES R/W
Measurement resolution:
000: 8 bit
001: 9 bit
010: 10 bit
011: 11 bit
100: 12 bit
101: 13 bit
Others: 14 bit
2:0 T_RES R/W
0x10
0x11
Measurement
interval in
periodic mode
0x0014
1 second
BIT NAME R/W DESCRIPTION
15:0 RM_CYCLE R/W
Measurement cycle in run- mode.
Unit of an LSB is 1/20 s (50 ms),
RM_CYCLE ranges from 0 (start
immediately after calculation is done)
to 0xffff * 0.05 s = 54 m 36.75 s
Table 14:
Sensor settings registers
Please note:
A short measurement interval can influence the power consumption and therefore the self-heating of the
sensor.
6.14 CRC Calculation
Response data words/memory write data are protected by a CRC8 checksum:
Property Value
Name CRC8
Width 8 bit
Polynomial 0x31 (x8 + x5 + x4 + x1)
XOR input 0xFF
Reflect input False
Reflect output False
XOR output 0x00
Figure 25: CRC8 properties
6.15 Package / Dimensions
The HTE501 sensor is provided as an open-cavity DFN (= Dual Flat No Leads) package.
The humidity sensor opening is centered on the top side of the package.