User Manual

P A G E 34
mikromedia 7 CAPACITIVE U S E R M A N U A L
OTHER PERIPHERALS
7.5 Temperature sensor
7.6 Real-time clock (RTC)
The MCP9700A, an integrated low-power linear active thermistor allows
measurement of the ambient temperature. This sensor provides an analog
voltage which changes linearly with the applied temperature. This voltage
can be sampled by the A/D converter on the host MCU, making it available
for various user applications. The MCP9700A can measure the temperature
within the range from -40°C to +125°C, but the actual measurement range
is limited by the thermal endurance of the mikromedia 7 board itself.
Nevertheless, having a thermal sensor on board is very useful, allowing the
development of thermal monitoring applications, weather stations, and
similar.
The host MCU contains a real-time clock peripheral module (RTC). The
RTC peripheral uses a separate power supply source, typically a battery. To
allow continuous tracking of time, mikromedia 7 is equipped with a button
cell battery that maintains RTC functionality even if the main power supply
is OFF. Extremely low power consumption of the RTC peripheral allows
these batteries to last very long. The mikromedia 7 development board is
equipped with the button cell battery holder, compatible with the CR1216,
CR1220, and CR1225 button cell battery types, allowing it to include a real
time clock within the applications.
mikromedia 7
CAPACITIVE
U S E R M A N U A L
RAPID
DEVELOPMENT
OF MULTIMEDIA
AND GUI-CENTRIC
APPLICATIONS