SLAU292C Datasheet, PDF (19/102 Pages) Texas Instruments – eZ430-Chronos™ Development Tool

www.ti.com
eZ430-Chronos Sports Watch Software
3.2.1.3 Temperature Mode
Press "*" until the temperature mode is active (see Figure 3-1 for details). The temperature can be shown
in degree Celsius or Fahrenheit. The selection depends on the time mode setting. In 12H mode, the
temperature is shown in degrees Fahrenheit, in 24H mode in degrees Celsius. The temperature is
measured in 1-second intervals. Positive temperatures are marked with a small arrow pointing up in the
upper LCD line, left of the temperature. An arrow pointing down indicated temperatures below zero.
Secondary function: None
Set function: Temperature calibration (can also calibrated from PC software in Sync mode, see
Section 3.3).
1. Hold "*" for 3 seconds until the temperature starts to flash
2. Set the temperatures by pushing the "UP" or "DOWN" button
3. Press "*" to confirm your settings
NOTE: The temperature is measured inside the watch right inside the CC430 device. When the
watch is worn, the temperature of the watch may be different due to the body heat. For
accurate temperature measurements, do not wear the watch and allow a sufficient amount of
time for the watch to adapt to the surrounding temperature.
3.2.1.4 Altimeter Mode
Press "*" until the altimeter alarm mode is active (see Figure 3-1 for details). The altitude can be shown in
metric or imperial units. In 12H time mode, the altitude is shown in imperial, in 24H time mode in metric
units. The altitude is measured only when the altimeter mode is active, and measurement happen in
intervals of 1 second.
The implementation of the altitude algorithm is done according to the VTI's application report AN33 without
any additional low-power optimizations. Therefore, the altimeter is active only in altimeter mode. In
addition, a timeout deactivates the measurements after 60 minutes. Altitudes above sea level are
indicated with a small arrow pointing up in the upper LCD line, left of the altitude. Altitudes below sea level
are indicated with a small arrow pointing down.
The altimeter algorithm is based on the air pressure and the ambient temperature. Therefore, changes in
air pressure affect the altitude accuracy. For precise measurements, the altimeter needs to be calibrated
manually upon weather changes.
NOTE: For most accurate altitude measurement, the watch needs to have ambient temperature
(i.e., should not be worn directly on the arm), as temperature is part of the altitude
measurement (see Section 3.2.1.3).
Secondary function: Re-activate altimeter after timeout
Set function: Altitude calibration
1. Hold "*" for 3 seconds until the altitude starts to flash
2. Set the altitude by pushing the "UP" or "DOWN" button
3. Press "*" to confirm your settings.
SLAU292C – November 2009 – Revised December 2010
Submit Documentation Feedback
© 2009–2010, Texas Instruments Incorporated
eZ430-Chronos Software
19