BT900 Development Kit
Version 0.3
Embedded Wireless Solutions Support Center:
http://ews-support.lairdtech.com
www.lairdtech.com/wireless
19
Laird Technologies
Americas: +1-800-492-2320
Europe: +44-1628-858-940
Hong Kong: +852-2268-6567 x026
Table 2: Vo vs. Temperature
Temperature (T)
Typical Vo
+80ºC
+924.7mV
+70ºC
+1041.4mV
+60ºC
+1158.1mV
+50ºC
+1274.8mV
+40ºC
+1391.5mV
+30ºC
+1508.2mV
+20ºC
+1624.9mV
+10ºC
+1741.6mV
+0ºC
+1858.2mV
-10ºC
+1975.0mV
-20ºC
+2091.7mV
-30ºC
+2208.4mV
6.2.3
Trim Potentiometer
The Trim Potentiometer is located in the middle of the development board to the right hand side of the coin cell
holder. It is labelled ‘Trim Pot’ on the silkscreen.
Figure 12: Trim Potentiometer
The Trim Potentiometer (VR9) can be disconnected from BT900 series module by micro-DIP switch CON14. Physical
micro-DIP switch body has text “ON” on the closed side.
The Trim Potentiometer (VR9) can be disconnected from supply rail by cutting the solder bridge SB2.
The Trim Potentiometer generates a voltage range of 0 V to ~0.9 V at C3 (CON14 pin4), see file
tpt.trimpot.test.sb in
the
smart
BASIC sample application library on BT900 product pages at:
