SPUSI2/NOPB National Semiconductor, SPUSI2/NOPB Datasheet - Page 18

• Manufacturer Part Number: SPUSI2/NOPB
• Description: BOARD EVAL DATA CAPTURE BOARD
• Manufacturer: National Semiconductor

Specifications of SPUSI2/NOPB

• Main Purpose: Interface, Data Capture
• Embedded: Yes, MCU, 8-Bit
• Utilized Ic / Part: WEBENCH® Sensor Designer Boards
• Primary Attributes: USB Interface Dongle II
• Secondary Attributes: SPI Interface
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: SPUSI2

6.2 Board Specific Computations.
possible by providing different variable values and are a superset of the corresponding
individual board equations. By setting non-relevant variables to passive values, such as 0
during addition or 1 during multiplication or division, the generic equation can be
reduced to the individual board computations.
6.2.1 Differential Sensor Board Computations.
6.2.2 Thermocouple Board Computations.
6.2.3 Thermopile Board Computations.
6.2.4 Photo Diode Board Computations.
The generic computations have been derived to support as many boards as
The differential board output code is used in the following computations:
or using a table lookup: sensorIn = f
The thermocouple computations are a slight variation:
The final step computes the value relative to another channel:
The Thermopile computations are a slight variation.
The Photo Diode computations are a slight variation.
ampOut = Code * Vref * k * 1000 / 2^n
ampIn = ampPout / gain
sensorIn = ampIn / Sensitivity
NonInverrting Amp:
Difference Amp:
ThermoC = TcTypeTable
ThermoCoupleTempC = ThermoC + SensorIn[ReferenceChannel]
ThermoCoupleTempC = ThermoC + SensorIn[ReferenceChannel]
Thermo = ( Code x Vref ) / (2^n x gain ) –LevelShift
Thermo = ( Code x Vref / 2^n –LevelShift) x 1/gain
-1
(Thermo)
-1
(ampIn)