DA6503.005
14 December 2016
MEASUREMENT CONTROL REGISTER 2 (E3/63HEX
)
Measurement control register
configures second half of the measurement settings
and also starts the measurement. See table 4.
2
(E3/63HEX
)
RSENSOR according to sensor resistance is
important only for the temperature measurement
mode. See also Temperature Measurement
Configuration in the Application Information section.
OSRS bits select over sampling ratio (OSR) setting
from five options. The OSR selection affects both
measurement resolution and conversion time. The
best resolution is achieved at highest OSR setting
4096 but the conversion time is longest. The fastest
conversion is achieved at lowest OSR setting 256
but the achieved resolution is lowest. Typically
highest OSR setting is used only in the most
PTS bits select between three measurement
modes; pressure, temperature and VDD level
monitoring modes.
The conversion starts right after writing data byte to
the Measurement control register 2. Thus to start
new conversion the measurement configuration
data has to be written first to Measurement control
register 1 and after that to the Measurement control
register 2. To avoid disturbing the running
measurement the serial communication with
MAS6503 should be kept idle during conversions.
The EOC pin goes low when the conversion starts
and it returns back high when the conversion is
ready.
precise
measurement
such
as
pressure
measurement. Medium or lowest OSR setting is
typically sufficient in the temperature measurement.
The lowest OSR setting can be used in the least
precision VDD level monitoring measurement.
RSENSOR bits select sensor resistance from eight
options from 2.0kΩ up to 10 kΩ. Selecting proper
Table 4. Measurement control register 2 (E3/63HEX) description
Bit Number
Bit Name
Description
Value
Function
7-5
OSRS
Over Sampling Ratio
(OSR) Selection
000
001
010
011
100
000
001
010
011
100
101
110
111
00
OSR = 256
OSR = 512
OSR = 1024
OSR = 2048
OSR = 4096
2.0kΩ
4-2
1-0
RSENSOR
Sensor Resistance
2.5kΩ
3.0kΩ
3.5kΩ
4.0kΩ
4.5kΩ
5.0kΩ
10.0kΩ
PTS
Pressure/
Temperature/
VDD Level Monitoring
Mode Selection
Temperature mode
VDD level monitoring mode
Pressure mode
-
01
10
11
16 (34)
MAS [ MICRO ANALOG SYSTEMS ]
