Description for the RSC TruStability line. More...

Detailed Description

ID: rsc
Name: Honeywell RSC TruStability Pressure and Temperature Sensors
Other Names: Honeywell RSC TruStability Boardmount Pressure Sensors
Category: pressure temp
Manufacturer: honeywell
Connection: spi
Link: https://sensing.honeywell.com/honeywell-sensing-trustability-rsc-series-data-sheet-32321348-b-en.pdf

The RSC Series is a piezoresistive silicon pressure sensor offering a digital output for reading pressure over the specified full scale pressure span and temperature range. It is calibrated and temperature compensated for sensor offset, sensitivity, temperature effects, and non-linearity using a 24-bit analog-todigital converter with integrated EEPROM. Pressure data may be acquired at rates between 20 and 2000 samples per second over an SPI interface. It is intended for use with non-corrosive, non-ionic gases, such as air and other dry gases, designed and manufactured according to ISO 9001 standards, and is REACH and RoHS compliant.

Most of the functionality available on this chip has been implemented. The driver calculates the compensated pressure and temperature values based on the information provided in the datasheet. The user must not mess around with the coefficient and adc init value readings from the EEPROM as these are used to calculate the compensated pressure and temperature values.

In order to get the sensor to work properly on an Edison, you would need to turn off the Edison SPI power management, this can be done with the command: echo on > /sys/devices/pci0000\:00/0000\:00\:07.1/power/control

You might have to use external pull up resistors on all the lines. More info about this has been provided in the datasheet with a table and a diagram.

    upm::RSC rsc(0, 9, 8);
    cout << "Sensor Name: " << rsc.getSensorName() << endl;
    rsc.setMode(NORMAL_MODE);
    rsc.setDataRate(N_DR_330_SPS);
    while (shouldRun) {
        cout << "inH2O pressure: " << rsc.getPressure() << endl;
        cout << "Temp (C): " << rsc.getTemperature() << endl;
        upm_delay(1);
    }

Public Member Functions
	RSC (uint8_t bus, uint8_t cs_ee_pin, uint8_t cs_adc_pin)
	Default constructor for rsc. More...

	~RSC ()

std::string	getSensorName ()

std::string	getSensorSerialNumber ()

float	getPressureRange ()

float	getMinimumPressure ()

std::string	getPressureUnit ()

std::string	getPressureType ()

uint8_t *	getInitialADCState ()

void	updateCoefficients ()

void	setupADC (uint8_t *adc_init_values)

float	getTemperature ()

float	getPressure ()

void	setMode (RSC_MODE mode)

void	setDataRate (RSC_DATA_RATE dr)

Constructor & Destructor Documentation

RSC	(	uint8_t	bus,
		uint8_t	cs_ee_pin,
		uint8_t	cs_adc_pin
	)

This device supports SPI. The sensor has two chip select pins since there are two ways to access content on the sensor - EEPROM/ADC. We will not be using the SPI CS here because that would work for all SPI operations. Hence, you are expected to initialize any 2 gpio pins for CS by providing the pin numbers.

Parameters

bus	SPI bus to use.
cs_ee_pin	The CS pin for accessing the EEPROM
cs_adc_pin	The CS pin for accessing the ADC

~RSC ( )

rsc destructor

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Member Function Documentation

string getSensorName ( )

This function provides the sensor name as a string to the user.

Returns: std::string sensor name

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string getSensorSerialNumber ( )

This function provides the sensor serial number as a string to the user.

Returns: std::string sensor serial number

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float getPressureRange ( )

This function provides the pressure range which the sensor can read out. This will vary for the different kinds of RSC sensors. This value is read from the EEPROM

Returns: float Total sensor pressure range

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float getMinimumPressure ( )

This function provides the minimum pressure which the sensor can read out. This will vary for the different kinds of RSC sensors. This value is read from the EEPROM

Returns: float Sensor minimum pressure

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string getPressureUnit ( )

This function gets the units that the particular RSC sensor being used reads out the pressure data in. Following are the possible units data can be read out in:

Pascal
Kilo Pascal
Mega Pascal
PSI
inH2O
Bar
milli Bar

This info can be retrieved from the EEPROM

Returns: std::string pressure units

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string getPressureType ( )

Function returns the type of RSC pressure sensor being used. This info is available in the EEPROM. Types:

Differential
Absolute
Gauge

Returns: std::string sensor type

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uint8_t * getInitialADCState ( )

Function returns the initial state that the ADC registers need to be set to. This info is retrieved from the EEPROM.

Returns: std::string sensor type

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void updateCoefficients ( )

Function used to update the coefficients. This function doesn't return the coefficent values. Intstead, it updates the 2-D array with the coefficient values read from the EEPROM. This function is mostly for internal use only.

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