/**************************************************************************//**
* @file em_opamp.h
* @brief Operational Amplifier (OPAMP) peripheral API
* @version 4.2.1
******************************************************************************
* @section License
* <b>(C) Copyright 2015 Silicon Labs, http://www.silabs.com</b>
*******************************************************************************
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
* DISCLAIMER OF WARRANTY/LIMITATION OF REMEDIES: Silicon Labs has no
* obligation to support this Software. Silicon Labs is providing the
* Software "AS IS", with no express or implied warranties of any kind,
* including, but not limited to, any implied warranties of merchantability
* or fitness for any particular purpose or warranties against infringement
* of any proprietary rights of a third party.
*
* Silicon Labs will not be liable for any consequential, incidental, or
* special damages, or any other relief, or for any claim by any third party,
* arising from your use of this Software.
*
******************************************************************************/
#ifndef __SILICON_LABS_EM_OPAMP_H__
#define __SILICON_LABS_EM_OPAMP_H__
#include "em_device.h"
#if defined(OPAMP_PRESENT) && (OPAMP_COUNT == 1)
#ifdef __cplusplus
extern "C" {
#endif
#include <stdint.h>
#include <stdbool.h>
#include "em_dac.h"
/***************************************************************************//**
* @addtogroup EM_Library
* @{
******************************************************************************/
/***************************************************************************//**
* @addtogroup OPAMP
* @{
******************************************************************************/
/** @cond DO_NOT_INCLUDE_WITH_DOXYGEN */
/** Validation of DAC OPA number for assert statements. */
#define DAC_OPA_VALID(opa) ((opa) <= OPA2)
/** @endcond */
/*******************************************************************************
******************************** ENUMS ************************************
******************************************************************************/
/** OPAMP selector values. */
typedef enum
{
OPA0 = 0, /**< Select OPA0. */
OPA1 = 1, /**< Select OPA1. */
OPA2 = 2 /**< Select OPA2. */
} OPAMP_TypeDef;
/** OPAMP negative terminal input selection values. */
typedef enum
{
opaNegSelDisable = DAC_OPA0MUX_NEGSEL_DISABLE, /**< Input disabled. */
opaNegSelUnityGain = DAC_OPA0MUX_NEGSEL_UG, /**< Unity gain feedback path. */
opaNegSelResTap = DAC_OPA0MUX_NEGSEL_OPATAP, /**< Feedback resistor ladder tap. */
opaNegSelNegPad = DAC_OPA0MUX_NEGSEL_NEGPAD /**< Negative pad as input. */
} OPAMP_NegSel_TypeDef;
/** OPAMP positive terminal input selection values. */
typedef enum
{
opaPosSelDisable = DAC_OPA0MUX_POSSEL_DISABLE, /**< Input disabled. */
opaPosSelDac = DAC_OPA0MUX_POSSEL_DAC, /**< DAC as input (not OPA2). */
opaPosSelPosPad = DAC_OPA0MUX_POSSEL_POSPAD, /**< Positive pad as input. */
opaPosSelOpaIn = DAC_OPA0MUX_POSSEL_OPA0INP, /**< Input from OPAx. */
opaPosSelResTapOpa0 = DAC_OPA0MUX_POSSEL_OPATAP /**< Feedback resistor ladder tap from OPA0. */
} OPAMP_PosSel_TypeDef;
/** OPAMP output terminal selection values. */
typedef enum
{
opaOutModeDisable = DAC_OPA0MUX_OUTMODE_DISABLE, /**< OPA output disabled. */
opaOutModeMain = DAC_OPA0MUX_OUTMODE_MAIN, /**< Main output to pin enabled. */
opaOutModeAlt = DAC_OPA0MUX_OUTMODE_ALT, /**< Alternate output(s) enabled (not OPA2). */
opaOutModeAll = DAC_OPA0MUX_OUTMODE_ALL /**< Both main and alternate enabled (not OPA2). */
} OPAMP_OutMode_TypeDef;
/** OPAMP gain values. */
typedef enum
{
opaResSelDefault = DAC_OPA0MUX_RESSEL_DEFAULT, /**< Default value when resistor ladder is unused. */
opaResSelR2eq0_33R1 = DAC_OPA0MUX_RESSEL_RES0, /**< R2 = 0.33 * R1 */
opaResSelR2eqR1 = DAC_OPA0MUX_RESSEL_RES1, /**< R2 = R1 */
opaResSelR1eq1_67R1 = DAC_OPA0MUX_RESSEL_RES2, /**< R2 = 1.67 R1 */
opaResSelR2eq2R1 = DAC_OPA0MUX_RESSEL_RES3, /**< R2 = 2 * R1 */
opaResSelR2eq3R1 = DAC_OPA0MUX_RESSEL_RES4, /**< R2 = 3 * R1 */
opaResSelR2eq4_33R1 = DAC_OPA0MUX_RESSEL_RES5, /**< R2 = 4.33 * R1 */
opaResSelR2eq7R1 = DAC_OPA0MUX_RESSEL_RES6, /**< R2 = 7 * R1 */
opaResSelR2eq15R1 = DAC_OPA0MUX_RESSEL_RES7 /**< R2 = 15 * R1 */
} OPAMP_ResSel_TypeDef;
/** OPAMP resistor ladder input selector values. */
typedef enum
{
opaResInMuxDisable = DAC_OPA0MUX_RESINMUX_DISABLE, /**< Resistor ladder disabled. */
opaResInMuxOpaIn = DAC_OPA0MUX_RESINMUX_OPA0INP, /**< Input from OPAx. */
opaResInMuxNegPad = DAC_OPA0MUX_RESINMUX_NEGPAD, /**< Input from negative pad. */
opaResInMuxPosPad = DAC_OPA0MUX_RESINMUX_POSPAD, /**< Input from positive pad. */
opaResInMuxVss = DAC_OPA0MUX_RESINMUX_VSS /**< Input connected to Vss. */
} OPAMP_ResInMux_TypeDef;
/*******************************************************************************
******************************* STRUCTS ***********************************
******************************************************************************/
/** OPAMP init structure. */
typedef struct
{
OPAMP_NegSel_TypeDef negSel; /**< Select input source for negative terminal. */
OPAMP_PosSel_TypeDef posSel; /**< Select input source for positive terminal. */
OPAMP_OutMode_TypeDef outMode; /**< Output terminal connection. */
OPAMP_ResSel_TypeDef resSel; /**< Select R2/R1 resistor ratio. */
OPAMP_ResInMux_TypeDef resInMux; /**< Select input source for resistor ladder. */
uint32_t outPen; /**< Alternate output enable bit mask. This value
should consist of one or more of the
DAC_OPA[opa#]MUX_OUTPEN_OUT[output#] flags
(defined in \<part_name\>_dac.h) OR'ed together.
@n @n
For OPA0:
@li DAC_OPA0MUX_OUTPEN_OUT0
@li DAC_OPA0MUX_OUTPEN_OUT1
@li DAC_OPA0MUX_OUTPEN_OUT2
@li DAC_OPA0MUX_OUTPEN_OUT3
@li DAC_OPA0MUX_OUTPEN_OUT4
For OPA1:
@li DAC_OPA1MUX_OUTPEN_OUT0
@li DAC_OPA1MUX_OUTPEN_OUT1
@li DAC_OPA1MUX_OUTPEN_OUT2
@li DAC_OPA1MUX_OUTPEN_OUT3
@li DAC_OPA1MUX_OUTPEN_OUT4
For OPA2:
@li DAC_OPA2MUX_OUTPEN_OUT0
@li DAC_OPA2MUX_OUTPEN_OUT1
E.g: @n
init.outPen = DAC_OPA0MUX_OUTPEN_OUT0 |
DAC_OPA0MUX_OUTPEN_OUT2 |
DAC_OPA0MUX_OUTPEN_OUT4; */
uint32_t bias; /**< Set OPAMP bias current. */
bool halfBias; /**< Divide OPAMP bias current by 2. */
bool lpfPosPadDisable; /**< Disable low pass filter on positive pad. */
bool lpfNegPadDisable; /**< Disable low pass filter on negative pad. */
bool nextOut; /**< Enable NEXTOUT signal source. */
bool npEn; /**< Enable positive pad. */
bool ppEn; /**< Enable negative pad. */
bool shortInputs; /**< Short OPAMP input terminals. */
bool hcmDisable; /**< Disable input rail-to-rail capability. */
bool defaultOffset; /**< Use factory calibrated opamp offset value. */
uint32_t offset; /**< Opamp offset value when @ref defaultOffset is false.*/
} OPAMP_Init_TypeDef;
/** Configuration of OPA0/1 in unity gain voltage follower mode. */
#define OPA_INIT_UNITY_GAIN \
{ \
opaNegSelUnityGain, /* Unity gain. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelDefault, /* Resistor ladder is not used. */ \
opaResInMuxDisable, /* Resistor ladder disabled. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in unity gain voltage follower mode. */
#define OPA_INIT_UNITY_GAIN_OPA2 \
{ \
opaNegSelUnityGain, /* Unity gain. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelDefault, /* Resistor ladder is not used. */ \
opaResInMuxDisable, /* Resistor ladder disabled. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0/1 in non-inverting amplifier mode. */
#define OPA_INIT_NON_INVERTING \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
true, /* Neg pad enabled, used as signal ground. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in non-inverting amplifier mode. */
#define OPA_INIT_NON_INVERTING_OPA2 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
true, /* Neg pad enabled, used as signal ground. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0/1 in inverting amplifier mode. */
#define OPA_INIT_INVERTING \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
true, /* Neg pad enabled, used as signal input. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in inverting amplifier mode. */
#define OPA_INIT_INVERTING_OPA2 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
true, /* Neg pad enabled, used as signal input. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0 in cascaded non-inverting amplifier mode. */
#define OPA_INIT_CASCADED_NON_INVERTING_OPA0 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA1). */ \
true, /* Neg pad enabled, used as signal ground. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA1 in cascaded non-inverting amplifier mode. */
#define OPA_INIT_CASCADED_NON_INVERTING_OPA1 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelOpaIn, /* Pos input from OPA0 output. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA2). */ \
true, /* Neg pad enabled, used as signal ground. */ \
false, /* Pos pad disabled. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in cascaded non-inverting amplifier mode. */
#define OPA_INIT_CASCADED_NON_INVERTING_OPA2 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelOpaIn, /* Pos input from OPA1 output. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eq0_33R1, /* R2 = 1/3 R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
true, /* Neg pad enabled, used as signal ground. */ \
false, /* Pos pad disabled. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0 in cascaded inverting amplifier mode. */
#define OPA_INIT_CASCADED_INVERTING_OPA0 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA1). */ \
true, /* Neg pad enabled, used as signal input. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA1 in cascaded inverting amplifier mode. */
#define OPA_INIT_CASCADED_INVERTING_OPA1 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxOpaIn, /* Resistor ladder input from OPA0. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA2). */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in cascaded inverting amplifier mode. */
#define OPA_INIT_CASCADED_INVERTING_OPA2 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxOpaIn, /* Resistor ladder input from OPA1. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Alternate output 0 enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0 in two-opamp differential driver mode. */
#define OPA_INIT_DIFF_DRIVER_OPA0 \
{ \
opaNegSelUnityGain, /* Unity gain. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelDefault, /* Resistor ladder is not used. */ \
opaResInMuxDisable, /* Resistor ladder disabled. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA1). */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA1 in two-opamp differential driver mode. */
#define OPA_INIT_DIFF_DRIVER_OPA1 \
{ \
opaNegSelResTap, /* Neg input from resistor ladder tap. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxOpaIn, /* Resistor ladder input from OPA0. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal ground. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA0 in three-opamp differential receiver mode. */
#define OPA_INIT_DIFF_RECEIVER_OPA0 \
{ \
opaNegSelUnityGain, /* Unity gain. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxNegPad, /* Resistor ladder input from neg pad. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA2). */ \
true, /* Neg pad enabled, used as signal ground. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA1 in three-opamp differential receiver mode. */
#define OPA_INIT_DIFF_RECEIVER_OPA1 \
{ \
opaNegSelUnityGain, /* Unity gain. */ \
opaPosSelPosPad, /* Pos input from pad. */ \
opaOutModeAll, /* Both main and alternate outputs. */ \
opaResSelDefault, /* Resistor ladder is not used. */ \
opaResInMuxDisable, /* Disable resistor ladder. */ \
0, /* No alternate outputs enabled. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
true, /* Pass output to next stage (OPA2). */ \
false, /* Neg pad disabled. */ \
true, /* Pos pad enabled, used as signal input. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/** Configuration of OPA2 in three-opamp differential receiver mode. */
#define OPA_INIT_DIFF_RECEIVER_OPA2 \
{ \
opaNegSelResTap, /* Input from resistor ladder tap. */ \
opaPosSelResTapOpa0, /* Input from OPA0 resistor ladder tap. */ \
opaOutModeMain, /* Main output enabled. */ \
opaResSelR2eqR1, /* R2 = R1 */ \
opaResInMuxOpaIn, /* Resistor ladder input from OPA1. */ \
DAC_OPA0MUX_OUTPEN_OUT0, /* Enable alternate output 0. */ \
_DAC_BIASPROG_BIASPROG_DEFAULT, /* Default bias setting. */ \
_DAC_BIASPROG_HALFBIAS_DEFAULT, /* Default half-bias setting. */ \
false, /* No low pass filter on pos pad. */ \
false, /* No low pass filter on neg pad. */ \
false, /* No nextout output enabled. */ \
false, /* Neg pad disabled. */ \
false, /* Pos pad disabled. */ \
false, /* No shorting of inputs. */ \
false, /* Rail-to-rail input enabled. */ \
true, /* Use factory calibrated opamp offset. */ \
0 /* Opamp offset value (not used). */ \
}
/*******************************************************************************
***************************** PROTOTYPES **********************************
******************************************************************************/
void OPAMP_Disable(DAC_TypeDef *dac, OPAMP_TypeDef opa);
void OPAMP_Enable(DAC_TypeDef *dac, OPAMP_TypeDef opa, const OPAMP_Init_TypeDef *init);
/** @} (end addtogroup OPAMP) */
/** @} (end addtogroup EM_Library) */
#ifdef __cplusplus
}
#endif
#endif /* defined( OPAMP_PRESENT ) && ( OPAMP_COUNT == 1 ) */
#endif /* __SILICON_LABS_EM_OPAMP_H__ */
