MPXH6400A

MPXH6400A is a pressure sensor IC (20 kPa to 400 kPa) made by NXP Semiconductors. This posting will provide the OSS-ECAL(Open Source Software for Electronic Components Abstraction Layer) for MPXH6400A.
MCU interface : ADC

CAUTION:Please be sure to refer to the latest version of the Datasheet prior to actual design.

MPXH6400A

General description

The NXP MPXxx6400A series sensor integrates on-chip, bipolar op amp circuitry and thin film resistor networks to provide a high output signal and temperature compensation. The small form factor and high reliability of on-chip integration make this pressure sensor a logical and economical choice for the system designer.
The MPXxx6400A series piezoresistive transducer is a state-of-the-art, monolithic, signal conditioned, silicon pressure sensor. This sensor combines advanced micromachining techniques, thin film metallization, and bipolar semiconductor processing to provide an accurate, high level analog output signal that is proportional to applied pressure.

Feature

Improved accuracy at high temperature
Available in super small outline package
1.5% maximum error over 0 °C to 85 °C
Fully calibrated and compensated
Ideally suited for microprocessor or microcontroller-based systems
Temperature compensated from -40 °C to +125 °C
Durable thermoplastic surface mount package
Package porting and mounting options enable tube attachment for liquefied natural gas (LPG) or remote sensing applications

Application

Fuel injected car engines
Vehicles powered by green gases (for example LPG and CNG)
Small engines
Industrial controls

OSS-ECAL specification

API Function

etSTS oMPXH6400A( etCMD cmd, float32* rlt )

The oMPXH6400A function is an API function that executes MPXH6400A processing according to the command in the argument.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_MIN	Minimum Pressure error (rlt is minimum Pressure)
		eSTS_ERR_MAX	Maximum Pressure error (rlt is maximum Pressure)
		eSTS_ERR_HAL_ADC	HAL ADC Error
		eSTS_ERR_COMMAND_CODE	Command selection error
		eSTS_ERR_OTHERS_RUN	Other components are executing the process
		eSTS_ERR_HAL_OTHERS_RUN	Other application is running HAL
		eSTS_ERR_ADC_OBJECT	AD conversion object selection error
Parameter IN	etCMD cmd	OSS-ECAL command code
		eCMD_START	Command to start AD conversion.
		eCMD_READ	Command that reads the AD conversion value, converts the AD conversion value to a characteristic Pressure, and stores the Pressure in rlt. AD conversion value to Pressure conversion equation Voltage value = (AD conversion value × VDD) / ( 2^{AD bit} ) Pressure = ((voltage value – voltage offset value) / gain) + Pressure offset value (Min, Max Limit)
		eCMD_START_READ	Command that starts AD conversion, waits for AD conversion to finish, reads out the AD conversion value, converts the AD conversion value to a characteristic Pressure, and stores the Pressure in rlt. AD conversion value to Pressure conversion equation Voltage value = (AD conversion value × VDD) / ( 2^{AD bit} ) Pressure = ((voltage value – voltage offset value) / gain) + Pressure offset value (Min, Max Limit)
Parameter OUT	float32* rlt	Pressure 20.0 to 400.0 [kPa]

Command Correspondence Table by HAL

Arduino	eCMD_START_READ
ARM Mbed	eCMD_START_READ
AUTOSAR	–
Infineon ModusToolbox	eCMD_START_READ
NXP MCUXpresso iMXRT1051B_1052B	eCMD_START eCMD_READ eCMD_START_READ
Renesas SSP	eCMD_START eCMD_READ eCMD_START_READ
STM STM32Cube FW_F4	eCMD_START eCMD_READ eCMD_START_READ

etSTS oMPXH6400A_START(void)

The oMPXH6400A_START function is an API function to start AD conversion of the MPXH6400A.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_HAL_ADC	HAL ADC Error
		eSTS_ERR_OTHERS_RUN	Other components are executing the process
		eSTS_ERR_HAL_OTHERS_RUN	Other application is running HAL
		eSTS_ERR_ADC_OBJECT	AD conversion object selection error

Function Correspondence Table by HAL

Arduino	–
ARM Mbed	–
AUTOSAR	X
Infineon ModusToolbox	–
NXP MCUXpresso iMXRT1051B_1052B	X
Renesas SSP	X
STM STM32Cube FW_F4	X

etSTS oMPXH6400A_READ( float32* rlt )

The oMPXH6400A_READ function is an API function that checks for the end of AD conversion of the MPXH6400A, reads the AD conversion value, converts the AD conversion value to a characteristic Pressure, and stores the Pressure in rlt.

AD conversion value to Pressure conversion equation
Voltage value = (AD conversion value × VDD) / ( 2^{AD bit} )
Pressure = ((voltage value – voltage offset value) / gain) + Pressure offset value (Min, Max Limit)

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_MIN	Minimum Pressure error (rlt is minimum Pressure)
		eSTS_ERR_MAX	Maximum Pressure error (rlt is maximum Pressure)
		eSTS_ERR_HAL_ADC	HAL ADC Error
		eSTS_ERR_TIMEOUT	ADC Timeout error (AUTOSAR only)
		eSTS_ERR_OTHERS_RUN	Other components are executing the process
		eSTS_ERR_ADC_OBJECT	AD conversion object selection error
Parameter OUT	float32* rlt	Pressure 20.0 to 400.0 [kPa]

Function Correspondence Table by HAL

Arduino	–
ARM Mbed	–
AUTOSAR	X	Time-out time ADC_TIMEOUT [us] setting
Infineon ModusToolbox	–
NXP MCUXpresso iMXRT1051B_1052B	X
Renesas SSP	X
STM STM32Cube FW_F4	X	Time-out time HAL_MAX_DELAY

etSTS oMPXH6400A_START_READ( float32* rlt )

The oMPXH6400A_START_READ function is an API function that starts an AD conversion of the MPXH6400A, waits for the AD conversion to finish, reads the AD conversion value, converts the AD conversion value to a Pressure characteristic, and stores the Pressure in rlt.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_MIN	Minimum Pressure error (rlt is minimum Pressure)
		eSTS_ERR_MAX	Maximum Pressure error (rlt is maximum Pressure)
		eSTS_ERR_HAL_ADC	HAL ADC Error
		eSTS_ERR_OTHERS_RUN	Other components are executing the process
		eSTS_ERR_HAL_OTHERS_RUN	Other application is running HAL
		eSTS_ERR_ADC_OBJECT	AD conversion object selection error
Parameter OUT	float32* rlt	Pressure 20.0 to 400.0 [kPa]

Function Correspondence Table by HAL

Arduino	X
ARM Mbed	X
AUTOSAR	–
Infineon ModusToolbox	X
NXP MCUXpresso iMXRT1051B_1052B	X
Renesas SSP	X
STM STM32Cube FW_F4	X	Time-out time HAL_MAX_DELAY

Sample program

etSTS oss_ecal( void )
{
        /*********************************************************************/
        /* ADC Gr is registered with multiple Ch and AD conversion is        */
        /* performed to convert MPXH6400A pressure.                          */
        /*********************************************************************/
        Adc_ValueGroupType val = 0;
        sint32 wk = 0;
        float32 phy = 0.0F;
        
        /* ADC Gr(Multi-Ch) start */
        sts = oMCAL_ADC_GR_START( ADC_MPXH6400A_GR );
        if( sts == eSTS_FIN )
        {
                /* ADC Gr(Multi-Ch) value read */
                sts = oMCAL_ADC_GR_READ( ADC_MPXH6400A_GR, GR_BUF );
                if( sts == eSTS_FIN )
                {
                        /* MPXH6400A Pressure conversion */
                        /* Get A/D value */
                        val = *(GR_BUF+ADC_MPXH6400A_CH);
                        /* Linear characteristic conversion */
                        wk = (sint32)mac_max_u16( val );
                        sts = oPRC_CHAR_CONV_L_FF( wk, cCOEF_MPXH6400A, &phy );
                        if( sts == eSTS_FIN )
                        {
                                vgPHY = phy;
                        }
                        else
                        {
                                /* nothing to do */
                        }
                }
                else
                {
                        /* nothing to do */
                }
        }
        else
        {
                /* nothing to do */
        }
}

API functions for AUTOSAR

In AUTOSAR, the ADC group and channels of the MCU may be registered to the MCAL ADC channel group for AD conversion. In such a case, use the following API functions.

etSTS oMCAL_ADC_GR_START( Adc_GroupType gr )

The oMCAL_ADC_GR_START function is an API function that initiates conversion of a ADC channel group.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_HAL_BUSY	HAL running
Parameter IN	Adc_GroupType gr	ID value of ADC channel group

etSTS oMCAL_ADC_GR_READ( Adc_GroupType gr, Adc_ValueGroupType* buf )

The oMCAL_ADC_GR_READ function is an API function that checks the end of ADC conversion for the ADC channel group, reads each AD conversion value, and stores each AD conversion value in buf. This function has a Timeout function and should be used with the ADC_TIMEOUT value set.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_HAL_ADC	HAL ADC Error
		eSTS_ERR_TIMEOUT	ADC Timeout error (AUTOSAR only)
		sSTS_ERR_PROCESS	The return value of the Adc_GetGroupStatus function is other than the following value. ADC_STREAM_COMPLETED ADC_BUSY
Parameter IN	Adc_GroupType gr	ID value of ADC channel group
Parameter OUT	Adc_ValueGroupType* buf	First address of buffer of ADC channel group

etSTS oPRC_CHAR_CONV_L_FF( sint32 before, const stCOEF_L_FF coef, float32* rlt )

The oPRC_CHAR_CONV_L_FF function is a common process function. This function converts the value of the argument before (AD conversion value) to a voltage, converts the voltage linearly by the constant coef, and limits the converted value by the maximum minimum value.

Return value	etSTS	OSS-ECAL status code
		eSTS_FIN	Completed successfully
		eSTS_ERR_MIN	Minimum temperature error (rlt is minimum temperature)
		eSTS_ERR_MAX	Maximum temperature error (rlt is maximum temperature)
Parameter OUT	float32* rlt	Pressure 20.0 to 400.0 [kPa]

Files

Folder^*	File	Summary
MPXH6400A_HALNAME_VERSION/sample	sample.c (.cpp)	Sample Application Program
	sample.h	Sample Application Header
MPXH6400A_HALNAME_VERSION	oMPXH6400A.c (.cpp)	OSS-ECAL Program for MPXH6400A
	oMPXH6400A.h	OSS-ECAL Header for MPXH6400A
	MPXH6400A_ARDUINO.ino	Sample application programs for Arduino
	oss_ecal.h	OSS-ECAL Common Header (Ver 01.00.00 or later, AUTOSAR is Ver 01.01.07 or later)
	oTypes.h	Typedef header file for AUTOSAR
	user_setting.c (.cpp)	Const and Table of User setting
	user_setting.h	Header of User setting
	readme.md	Readme
	OSS-ECAL Terms of Use.txt	OSS-ECAL Terms of Use

* For HALNAME, please refer to HAL Support.

HAL Support List

HAL	MCU*	Development environment*	HALNAME
Arduino 1.8.6	ATmega2560 ATmega328P	Mega 2560 Rev3 Arduino Pro Mini 3.3V	ARDUINO
ARM Mbed 6.17.0	STM32F401RE	STM32 Nucleo-64 boards	MBED
AUTOSAR 4.4 (MCAL)	S32K144	S32K144EVB-Q100	MCAL
Infineon ModusToolbox HAL Cat1 2.4.3	CYBLE-416045-02	CY8CPROTO-063-BLE PSoC 6 BLE Prototyping Kit	ModusToolbox
NXP MCUXpresso SDK iMXRT1051B_1052B ksdk2_0	MIMXRT1052DVL6A	IMXRT1050-EVKB	iMXRT1051B1052B
Renesas SSP 2.4.0	R7FS7G27H3A01CFC	S7G2 SK	SSP
STM STM32Cube FW_F4 V1.27.1	STM32F401RE	STM32 Nucleo-64 boards	STM32F4

* MCU and development environment at the time of development. Even if the same HAL is used, different MCUs and development environments may not work together.

OSS-ECAL Download

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Built-in How to

How to incorporate OSS-ECAL into user programs

How to incorporate multiple OSS-ECALs in a user program (same MCU function)

How to incorporate multiple OSS-ECALs in a user program (different MCU function)

How to incorporate multiple identical electronic components into a user program

How to reduce the impact on user programs by replacing electronic components

CAUTION

The sample version of OSS-ECAL is not intended to be used with Threads (Tasks) or interrupts of different priority. Please do not use it as in the example below.

Example: If each sensor is assigned to the same ADC group and the OSS-ECAL API is executed in processes with different priorities, correct values may not be obtained.
ADC Gr0 Ch0　Temperature sensor AD22100A　100ms cycle Thread (low priority) to take in temperature
ADC Gr0 Ch1　Pressure sensor　　 MPX5999D　Event interrupts (high priority) to take pressure