SI7020-A10 Datasheet, PDF (26/34 Pages) Silicon Laboratories – Excellent long term stability

Si7020-A10
6. Control Register
Table 12. Register Summary
Register
User Register 1
Bit 7
RES1
Bit 6
VDDS
Bit 5
RSVD
Bit 4
RSVD
Bit 3
RSVD
Bit 2
HTRE
Bit 1
RSVD
Bit 0
RES0
Notes:
1. Any register not listed here is reserved and must not be written. The result of a read operation on these bits is
undefined.
2. Except where noted, reserved register bits will always read back as “1,” and are not affected by write operations. For
future compatibility, it is recommended that prior to a write operation, registers should be read. Then the values read
from the RSVD bits should be written back unchanged during the write operation.
6.1. Register Descriptions
Register 1. User Register 1
Bit
D7
D6
Name
RES1
VDDS
Type
R/W
R
Reset Settings = 0011_1010
D5
RSVD
R/W
D4
D3
RSVD RSVD
R/W
D2
HTRE
R/W
D1
RSVD
R/W
D0
RES0
R/W
Bit
D7; D0
D6
D5, D4, D3
D2
D1
Name
RES[1:0]
VDDS
RSVD
HTRE
RSVD
Function
Measurement Resolution:
RH Temp
00:
12 bit14 bit
01:
8 bit12 bit
10:
10 bit13 bit
11:
11 bit11 bit
VDD Status:
0:
1:
V_DD OK
V_DD Low
The minimum recommended operating voltage is 1.9 V. A transi-
tion of the VDD status bit from 0 to 1 indicates that VDD is
between 1.8 V and 1.9 V. If the VDD drops below 1.8 V, the
device will no longer operate correctly.
Reserved
1=On-chip Heater Enable
0=On-chip Heater Disable
Reserved
26
Rev. 1.1