Calibration_Functions
[Calibration_Block]

Turn on High power 1.8V/1.1V reference and 2.5V LP reference.

Returns:

return none.

Definition at line 3037 of file ad5940.c.

Turn on ADC to sample one SINC2 data.

Returns:

return ADCCode.

Definition at line 3062 of file ad5940.c.

Calibrate ADC PGA.

Parameters:

pADCPGACal,:

PGA calibration parameters include filter setup and PGA gain.

Returns:

AD5940ERR_OK.

Determine Gain calibration method according to different gain value... and calibration register

AD5940 use formular Output = gain*(input + offset) for calibration. So, the measured results should be divided by gain to get value for offset register.

Definition at line 3087 of file ad5940.c.

calibrate HSDAC output voltage using ADC.

Note:

It acutally calibrates voltage output of excitation buffer.

Parameters:

pCalCfg,:

pointer to configuration structure

Returns:

return AD5940ERR_OK if succeeded.

Definition at line 3938 of file ad5940.c.

Measure HSTIA internal RTIA impedance.

Parameters:

pCalCfg,:	pointer to calibration structure.
pResult,:	Pointer to a variable that used to store result. If bPolarResult in structure is set, then use type fImpPol_Type otherwise use fImpCar_Type.

Returns:

AD5940ERR_OK if succeed.

Definition at line 3394 of file ad5940.c.

Calibrate HSTIA offset-ongoing.

Parameters:

pHSTIAOffsetCal,:

pointer to configuration.

Returns:

AD5940ERR_OK.

Definition at line 3382 of file ad5940.c.

Use system clock to measure LFOSC frequency.

Note:

Set system clock to external crystal to get a better measurement accuracy. This function use 3 sequences and the start address is specified by parameter.

Parameters:

pCfg,:	pointer to structure.
pFreq,:	Pointer to a variable that used to store frequency in Hz.

Returns:

AD5940ERR_OK if succeed.

  Sleep wakeup timer running...
  -SLP----WKP----SLP----WKP----SLP----WKP
  --|-----|-------------|-------------|------------Trigger sequencer when Wakeup Timer over.
  --------|SEQA---------|SEQB----------------------Execute SeqA then SeqB
  ---------|InitT--------|StopT--------------------SeqA start timer and SeqB trigger interrupt so MCU read back current count
  ------------------------|INT---------------------
  -----------------------------------------|Read---We read SEQTIMEOUT register here
  ---------|-----TimerCount----------------|-------
  ---------|--------------|---TimerCount2--|-------We change SeqB to reset timer so we measure how much time needed for MCU to read back SEQTIMEOUT register(TimerCount2)

Interrupt flag AFEINTSRC_ENDSEQ will be set after this command. So We can inform MCU to read back current timer value. MCU will need some additional time to read back time count. So we use SeqB to measure how much time needed for MCU to read back

Definition at line 4272 of file ad5940.c.

Use ADC to measure LPDAC offset and gain factor.

Note:

Assume ADC is accurate enough or accurate than LPDAC at least.

Parameters:

pCalCfg,:	pointer to structure.
pResult,:	the pointer to save calibration result.

Returns:

AD5940ERR_OK if succeed.

Definition at line 4105 of file ad5940.c.

Measure LPTIA internal RTIA impedance with HSTIA.

This is the recommended method for LPTIA RTIA calibration.

Parameters:

pCalCfg,:	pointer to calibration structure.
pResult,:	Pointer to a variable that used to store result. If bPolarResult in structure is set, then use type fImpPol_Type otherwise use fImpCar_Type.

Returns:

AD5940ERR_OK if succeed.

Determine the best ADC PGA gain for both RCAL and RTIA voltage measurement.

Definition at line 3605 of file ad5940.c.

Calibrate LPTIA offset.

Parameters:

pLPTIAOffsetCal

Pointer to LPTIA offset calibration settings.

Returns:

AD5940ERR_OK.

Definition at line 3263 of file ad5940.c.