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What is the DLP NIRscan Nano EVM?
1.2.2 DLP NIRscan Nano Electronics
The DLP NIRscan Nano EVM contains the following four boards:
•
Microcontroller board: The Microcontroller board is the largest board in the DLP NIRscan Nano EVM.
This board includes the following:
– Tiva TM4C1297 microcontroller: The Tiva processor controls the whole system. The Tiva runs the
TI realtime operating system (RTOS), the Bluetopia stack, and the spectroscopy software. When it
receives a scan command through USB, Bluetooth, or through pressing the scan button, the Tiva
streams through its LCD interface a set of unique wavelength specific patterns to the DLPC150 for
display on the DMD while synchronizing the sampling of the spectrometer's ADC. An external
32MB SDRAM allows for additional code storage and stores the pattern buffer streamed to the
DLPC150.
– External interfaces: The Microcontroller board provides two main interfaces to the outside world:
USB and Bluetooth Low Energy. To leverage the DLP NIRscan EVM platform for new product
development using the Tiva processor, the microcontroller board also contains a Tiva debug JTAG
port, which can be used with Code Composer Studio™ emulation software and XDS100, XDS200,
or XDS560 emulators. The Microcontroller board also includes and expansion connector with SPI,
UART, and GPIO capability for connection to external systems.
– Battery charging circuits: An optional 3.7-V Lithium-Ion or Lithium-Polymer can be added to power
the system. The on-board power management circuits of the bq24250 device take power from USB
and simultaneously charge the battery if its voltage is below 4.2 V at up to 1-A charge current. The
bq24250 also monitors an optional thermistor for battery temperature monitoring during charge.
– microSD card connector: The microSD card connector allows additional storage for scan data when
the system is not connected to a PC nor iOS device.
– HDC1000 humidity and temperature sensor: Measures the humidity and temperature of the system.
These values are captured with each scan.
•
DLP controller board: The DLPC150 controller board is the second largest board in the DLP NIRscan
Nano EVM. This board includes the following:
– DLPC150 controller: The DLPC150 receives the pattern data from the Tiva TM4C1297 processor
over a 24-bit RGB bus. The DLPC150 decodes the pattern information and converts the information
into the correct format for the DLP2010NIR DMD. The DLPC150 controls and synchronizes all the
DMD signals, thereby directing each individual mirror to its desired state.
– DLPA2005 PMIC: The DLPA2005 is a power management IC that controls all the supplies to the
DLP2010NIR DMD and the DMD interface portion of the DLPC150 supplies.
– Lamp driver circuit: To provide constant current to the near-infrared lamps, a OPA567 based power
amplifier circuit regulates the current to the lamps to 280 mA at 5 V based on the voltage across a
sense resistor monitored by the INA213 current shunt monitor.
•
Detector board: The detector board includes the following:
– Transimpedance low-noise amplifier: Amplifies the signal form the InGaAs detector to the ADC.
– ADS1255 ADC: Converts the amplified signal of the InGaAs detector into a 24-bit value for Tiva
processing.
– TMP006 thermopile sensor: Measures the InGaAs detector temperature and ambient temperature
of the system. These values are captured with each scan.
– 1-mm non-cooled Hamamatsu G12180-010A InGaAs photodiode
•
DMD board: The DMD board includes the DLP near-infrared digital micromirror.
The DLP NIRscan Nano electronics contain many devices manufactured by Texas Instruments.
lists the main parts and their functions.
12
DLP NIRscan Nano Overview
Copyright © 2015, Texas Instruments Incorporated
www.ti.com
Table 1-2
DLPU030B – June 2015 – Revised July 2015
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