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Hardware Description
3.7
Analog-to-Digital Converter
The 10-bit ADC inside the MSP430F2274 converts voltage at the output of the op-amp into a 10-bit value.
Both components are connected to each other inside the MSP430F2274. By default, the ADC uses
reference voltages of 0 V (GND) and 3.3 V (V
CC
) for its samples in single-channel, single-conversion
mode, which is configured in software and can be changed for the different operations of the ADC.
However, channel A1 of the ADC is the only channel the op-amp output is connected to by default.
See the
MSP430F2274 user’s guide
for more information on the ADC.
3.8
GPIO Pins
On the TIDM-TIA, P1.0 from the MSP430F2274 controls the onboard LED. The LED turns on when the
photodiode provides a dark reading and turns off for a bright reading. Whether a reading is "dark" or
"bright" is determined by the conversion value from the ADC.
The TIDM-TIA also offers access to three GPIO pins on the MSP430F2274. Pins P1.1, P2.3, and P3.6 are
all available to use through jumper J2. See the
MSP430F2274 user’s guide
for more information on these
pins.
7
TIDU443 – August 2014
MSP430F2274 Transimpedance Amplifier (TIDM-TIA) User's Guide
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