moteiv Telos User Manual page 24

If expansion pin 10 (ADC3) is used for digital I/O instead of analog inputs, R14 must be
populated with a 0 ohm resistor to enable the pin for digital I/O (GIO0) on the microcontroller.
R16 must be populated with a 0 ohm resistor to enable GIO1. R14 and R16 are located on the
top side of Telos between the USB controller and the radio.
NOTE: When R14/R16 is populated (GIO0/GIO1 enabled), ADC3/ADC2 will not provide
reliable readings if an application reverts to using the ADC input instead of the digital I/O
port input on the microcontroller. R14/R16 should be removed when using ADC3/ADC2 for
analog input.
The 6-pin IDC header also has an optional jumper, R15. By installing a 0 ohm resistor at R15,
GIO3 is directly connected to SVSout. By making GIO3 an input and using the SVS features of
the microcontroller, the SVSout function can be exported via pin 4 of U28.
A separate Supply Voltage Supervisor (SVS) 2-pin IDC header is provided underneath the USB
connector at position U7. The SVS header allows add-on boards to be built that connect to the
positive and negative battery terminals and the SVS pins in order to provide power the module
and use the microcontroller's advanced SVS functionality for boost converters, solar systems,
and rechargeable systems. The SVS header is shown in Figure 24 and includes the SVSin and
SVSout pins from the microcontroller.
Analog Input 7 (ADC7) Analog Input 7 (ADC7) Analog Input 7 (ADC7)
Figure 24 : Functionality of the 2-pin Supply Voltage Supervisor connector (U7).
Moteiv Corporation
DAC 1 / DAC 1 / DAC 1 / SVS in SVS in SVS in
Telos (Rev B) : PRELIMINARY Datasheet (12/5/2004)
Rev B (Low Power Wireless Sensor Module)
SVS out SVS out SVS out
1 1 1 2 2 2
Telos
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