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.

ADS1220_Test

Example circuit schematic complete with component values. RREF should be a high accuracy resistor with a low PPM.

Macro reference

Initialise

	Initialise
Initialize the ADS1220 ADC with default settings
- BYTE	Return

ReadRTDResistance

	ReadRTDResistance
Reads the RTD sensor and returns resistance in ohms
- FLOAT	Return

ReadRTDTemperature

	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	Return

SampleDiffRAW

	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	ChannelA
Positive channel: 0-3 (AN0-AN3)
- BYTE	ChannelB
Negative channel: 0-3 (AN0-AN3)
- BYTE	Gain
PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x
- LONG	Return

SampleDiffVolts

	SampleDiffVolts
Performs a differential ADC sample and returns voltage in volts
- BYTE	ChannelA
Positive channel: 0-3 (AN0-AN3)
- BYTE	ChannelB
Negative channel: 0-3 (AN0-AN3)
- BYTE	Gain
PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x
- FLOAT	Return

SampleSglRaw

	SampleSglRaw
Performs a single-ended ADC sample on the selected channel and returns 24-bit raw value
- BYTE	Channel
Range: 0-3 (AN0-AN3)
- BYTE	Gain
PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x
- LONG	Return

SampleSglVolts

	SampleSglVolts
Performs a single-ended ADC sample and returns voltage in volts
- BYTE	Channel
Range: 0-3 (AN0-AN3)
- BYTE	Gain
PGA Gain: 0=1x, 1=2x, 2=4x, 3=8x, 4=16x, 5=32x, 6=64x, 7=128x
- FLOAT	Return

Property reference

	Properties
	Connections
	Channel
SPI Channel selector
	Prescale
Prescale option selector
	MOSI
SPI Data Out Pin SDO - Also Known as Master Out Slave In (MOSI) when used in Master mode.
	MOSI Remap Pin
Select which the target pin to assign the MOSI hardware pin functionality.
	MISO
SPI Data In Pin SDI - Also Known as Master In Slave Out (MISO) when used in Master mode.
	MISO Remap Pin
Select which the target pin to assign the MISO hardware pin functionality.
	CLK
SPI Clock Pin CLK - The Clock signal is driven by the SPI master.
	CLK Remap Pin
Select which the target pin to assign the CLK hardware pin functionality.
	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.
	Use Ready Pin
Use DRDY pin to detect when conversion is complete. If disabled, polling will be used.
	DRDY Pin
Data Ready pin - goes low when conversion is complete
	Configuration
	Data Rate
Programmable Data Rate (SPS)
	Operating Mode
	Conversion Mode
	PGA Gain
Programmable Gain Amplifier (PGA) gain setting
	Voltage Reference
Voltage reference source
	Reference Voltage
	FIR Filter
	IDAC Current (uA)
IDAC excitation current in microamperes. Typical values: 100, 250, 500, 750, 1000. Default: 250uA
	I1MUX
	I2MUX
	RTD Configuration
	RTD Type
RTD sensor type - determines base resistance at 0°C
	RTD Configuration
	Reference Resistor
High precision reference resistor value in ohms. Typically 400Ω for PT100 or 4000Ω for PT1000
	Temperature Coefficient
	Simulation
	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