Component: ADC 24bit ADS1220 (Analog Input)
| Author | Matrix TSL |
| Version | 1.0 |
| Category | Analog Input |
ADC 24bit ADS1220 component
A Precision Low power 24Bit SPI ADC 4 channel device with Programmable Gain Amplifier (PGA) and Data Rates up to 2 kSPS
Detailed description
No detailed description exists yet for this component
Examples
Example use case of a 3-wire RTD to read high resolution and high accuracy temperature.
Example circuit schematic complete with component values. RREF should be a high accuracy resistor with a low PPM.
Macro reference
Initialise
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Initialise |
| Initialize the ADS1220 ADC with default settings | |
 - BYTE
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Return |
ReadRTDResistance
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ReadRTDResistance |
| Reads the RTD sensor and returns resistance in ohms | |
 - FLOAT
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Return |
ReadRTDTemperature
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ReadRTDTemperature |
| Reads the RTD sensor and returns temperature in degrees Celsius using linear approximation - matches GitHub library get_temperature_from_rtd_ohms_with_linear_approx | |
| - FLOAT
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Return |
SampleDiffRAW
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SampleDiffRAW |
| Performs a differential ADC sample between two channels and returns 24-bit raw value. Not all channel combinations are possible, see datasheet p40 section MUX. Returns 0 if the channel selection is invalid. | |
| - BYTE
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ChannelA |
| Positive channel: 0-3 (AN0-AN3) | |
| - BYTE
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ChannelB |
| Negative channel: 0-3 (AN0-AN3) | |
| - BYTE
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Gain |
| PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x | |
 - LONG
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Return |
SampleDiffVolts
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SampleDiffVolts |
| Performs a differential ADC sample and returns voltage in volts | |
| - BYTE
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ChannelA |
| Positive channel: 0-3 (AN0-AN3) | |
| - BYTE
|
ChannelB |
| Negative channel: 0-3 (AN0-AN3) | |
| - BYTE
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Gain |
| PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x | |
| - FLOAT
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Return |
SampleSglRaw
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SampleSglRaw |
| Performs a single-ended ADC sample on the selected channel and returns 24-bit raw value | |
| - BYTE
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Channel |
| Range: 0-3 (AN0-AN3) | |
| - BYTE
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Gain |
| PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x | |
| - LONG
|
Return |
SampleSglVolts
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SampleSglVolts |
| Performs a single-ended ADC sample and returns voltage in volts | |
| - BYTE
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Channel |
| Range: 0-3 (AN0-AN3) | |
| - BYTE
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Gain |
| PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x | |
| - FLOAT
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Return |
Property reference
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Properties |
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Connections |
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Channel |
| SPI Channel selector | |
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Prescale |
| Prescale option selector | |
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MOSI |
| SPI Data Out Pin SDO - Also Known as Master Out Slave In (MOSI) when used in Master mode. | |
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MOSI Remap Pin |
| Select which the target pin to assign the MOSI hardware pin functionality. | |
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MISO |
| SPI Data In Pin SDI - Also Known as Master In Slave Out (MISO) when used in Master mode. | |
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MISO Remap Pin |
| Select which the target pin to assign the MISO hardware pin functionality. | |
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CLK |
| SPI Clock Pin CLK - The Clock signal is driven by the SPI master. | |
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CLK Remap Pin |
| Select which the target pin to assign the CLK hardware pin functionality. | |
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CS / SS |
| Chip Select / Slave Select Pin Master Mode: General purpose output pin used to select the remote SPI device. Slave Mode: Hardware chip select pin input used to select the SPI device. | |
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Use Ready Pin |
| Use DRDY pin to detect when conversion is complete. If disabled, polling will be used. | |
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DRDY Pin |
| Data Ready pin - goes low when conversion is complete | |
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Configuration |
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Data Rate |
| Programmable Data Rate (SPS) | |
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Operating Mode |
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Conversion Mode |
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PGA Gain |
| Programmable Gain Amplifier (PGA) gain setting | |
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Voltage Reference |
| Voltage reference source | |
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Reference Voltage |
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FIR Filter |
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IDAC Current (uA) |
| IDAC excitation current in microamperes. Typical values: 100, 250, 500, 750, 1000. Default: 250uA | |
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I1MUX |
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I2MUX |
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RTD Configuration |
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RTD Type |
| RTD sensor type - determines base resistance at 0°C | |
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RTD Configuration |
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Reference Resistor |
| High precision reference resistor value in ohms. Typically 400Ω for PT100 or 4000Ω for PT1000 | |
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Temperature Coefficient |
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Simulation |
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Simulate Comms |
| Allows the communications to be simulated overriding the value on the panel slider controls. | |
Component Source Code
Please click here to download the component source project: FC_Comp_Source_External_ADC24Bit_ADS1220_1.fcfx
Please click here to view the component source code (Beta): FC_Comp_Source_External_ADC24Bit_ADS1220_1.fcfx