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22

6. Control Register

Table 11. Register Summary

Register

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

User Register 1

RES1

VDDS

RSVD

RSVD

RSVD

HTRE

RSVD

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

D5

D4

D3

D2

D1

D0

Name

RES1

VDDS

RSVD

RSVD

RSVD

HTRE

RSVD

RES0

Type

R/W

R

R/W

R/W

R/W

R/W

R/W

Reset Settings = 0011_1010

Bit

Name

Function

D7; D0

RES[1:0]

Measurement Resolution:

RH

Temp

00:

12 bit

14 bit

01:

8 bit

12 bit

10:

10 bit

13 bit

11:

11 bit

11 bit

D6

VDDS

VDD Status:

0:

1:

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.

D5, D4, D3

RSVD

Reserved

D2

HTRE

1=On-chip Heater Enable

0=On-chip Heater Disable

D1

RSVD

Reserved