61302V Barometric Pressure Sensor
4.2.
Analog Output
If the 61302V is to be used in a voltage output mode it is
recommended that the output range of the sensor be remapped
by changing the output range in the sensor software. This is
important in maintaining the highest level of measurement
accuracy. Hardware jumpers and software parameters determine
voltage output operation. Appendix A shows jumper
configurations, and Appendix B shows steps for software
configuration. The jumper settings are also described below.
Both
P4
jumpers must be in position B for voltage output.
Jumper
P3
sets the Voltage Output Scale to either 0-5000 mV or
0-2500 mV.
Note
- Jumper
P3
must agree with the software Vout Scale
parameter in order to achieve calibrated output.
The voltage output scale may be mapped to any part of the 500 to
1100 hPa pressure range using the VOUT HI and VOUT LO
software parameters. The standard setting maps 0 to 5000 mV
with 500 to 1100 hPa.
For example:
hPa = 0.12 * mV + 500
Effective range is 600 hPa, Analog signal resolution is 12
bit (resolution = 600/2
12
)
Therefore the effective resolution is about 0.15 hPa
Better effective resolution may be achieved by mapping the
voltage output to a narrower range of pressure with the VOUT HI
and VOUT LO parameters. In most applications VOUT LO can be
set to 950 hPa and VOUT HI can be set to 1050 hPa (VOUT
Scale set to 0-5000 mV):
hPa = 0.02 * mV + 950
Effective range is 100 hPa, Analog signal resolution is 12
bit (resolution = 100/2
12
)
Effective resolution is about 0.025 hPa
Please see Section 4.3 and Appendix B for details on changing
the VOUT HI and LO parameters.
With jumper P4 configured for voltage output, a special optional
trigger (TRIG) input may be used to control barometer power.
When TRIG=0V, all processes cease and power consumption is
reduced to 1.4uA. When the voltage on TRIG > 1.8V (or left
floating), normal operation resumes with a power up reset. The
TRIG input connection is optional. It is recommended to connect
6
