DA6505.005
11 June 2018
CONTROL REGISTER (EF/6FHEX
)
The
Control
register
(EF/6FHEX
)
contains
See ELECTRICAL CHARACTERISTICS on pages
3-7.
measurement and operating mode selection
settings. Writing to Control register starts the
selected measurements. See table 4.
The MODE bits select from three operating modes.
The MODE=00 setting selects sleep mode in which
there are no measurements performed and only a
very small sleep current is drawn from the supplies.
There are oversampling ratio (OSR) settings for
temperature and pressure. The OSRT setting is for
temperature and OSRP for pressure measurement.
Each of them has seven settings 1/4x, 1/2x, 1x, 2x,
4x, 8x and 16x in addition to no measurement
setting. Thus it is possible select only temperature or
pressure measurement or both measurements. The
oversampling ratio setting affects measurement
resolution and speed and power consumption. The
highest value setting gives the highest resolution but
it has the longest A/D conversion time and the
highest power consumption. Similar way the lowest
value setting gives the lowest resolution but it has
the shortest A/D conversion time and the lowest
power consumption. Thus the multiple oversampling
ratio settings allow optimizing measurements
between speed, power consumption and resolution.
The MODE=01 or 10 setting selects forced mode
which runs selected measurements only once after
which the device returns automatically to the sleep
mode.
The MODE=11 setting selects normal mode in which
selected
measurements
are
performed
automatically in
a
loop. The delay between
measurements is configured by DELAY bit setting in
the Configuration register (EE/6EHEX). To minimize
current consumption the device enters standby
mode for the time between measurements during
which only the internal clock oscillator is running.
The automatic measurements are stopped by setting
MODE=00 which selects the sleep mode.
Table 4. Control register (EF/6FHEX) description
Bit
Bit
Description
Value
Function
Number
Name
7-5
4-2
1-0
OSRT
Oversampling ratio
for temperature
measurement
000
001
010
011
100
101
110
111
000
001
010
011
100
101
110
111
00
No temperature measurement (default)
1/4x Very fast mode
1/2x Fast mode
1x Ultra low power
2x Low power
4x Standard resolution
8x High resolution
16x Ultra high resolution
No pressure measurement (default)
1/4x Very fast mode
1/2x Fast mode
1x Ultra low power
2x Low power
4x Standard resolution
8x High resolution
16x Ultra high resolution
OSRP
Oversampling ratio
for pressure
measurement
MODE Operating mode
Sleep mode (default)
01, 10 Forced mode (single command based measurement)
11 Normal mode (automated measurements)
19 (44)
MAS [ MICRO ANALOG SYSTEMS ]
