AD7746 Capacitance-to-digital converter with temperature sensor driver. More...

Detailed Description

AD7746 Capacitance-to-digital converter with temperature sensor driver.

Author: Leandro Lanzieri leand.nosp@m.ro.l.nosp@m.anzie.nosp@m.ri@h.nosp@m.aw-ha.nosp@m.mbur.nosp@m.g.de

Definition in file ad7746.h.

#include "periph/i2c.h"
#include "periph/gpio.h"

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Macros
#define	AD7746_ZERO_SCALE_CODE (0x800000LL)
	0 fF capacitance code

#define	AD7746_INTERNAL_VREF (1170)
	Interval voltage reference expressed in mV.

#define	AD7746_DAC_MAX (0x7F)
	Maximum value that can be configured into the DACs.

Enumerations
enum	{ AD7746_READ_CAP_CH = 0 , AD7746_READ_VT_CH = 1 }
	Channel numbers for reading. More...

enum	{ AD7746_OK = 0 , AD7746_NOI2C = -1 , AD7746_NODEV = -2 , AD7746_NODATA = -3 }
	Named return values. More...

enum	ad7746_vt_sample_rate_t { AD7746_VT_SR_498 = 0 , AD7746_VT_SR_312 = 1 , AD7746_VT_SR_161 = 2 , AD7746_VT_SR_082 = 3 }
	Voltage / Temperature channel sample rates. More...

enum	ad7746_vt_mode_t { AD7746_VT_MD_DIS = -1 , AD7746_VT_MD_TEMP = 0 , AD7746_VT_MD_ETEMP = 1 , AD7746_VT_MD_VDD = 2 , AD7746_VT_MD_VIN = 3 }
	Voltage / Temperature channel modes. More...

enum	ad7746_cap_input_t { AD7746_CAP_IN_1 = 0 , AD7746_CAP_IN_2 }
	Capacitance channel input. More...

enum	ad7746_cap_sample_rate_t { AD7746_CAP_SR_909 = 0 , AD7746_CAP_SR_838 = 1 , AD7746_CAP_SR_500 = 2 , AD7746_CAP_SR_263 = 3 , AD7746_CAP_SR_161 = 4 , AD7746_CAP_SR_130 = 5 , AD7746_CAP_SR_109 = 6 , AD7746_CAP_SR_091 = 7 }
	Capacitive channel sample rate. More...

enum	ad7746_exc_config_t { AD7746_EXC_A = 0x06 , AD7746_EXC_B = 0x09 , AD7746_EXC_AB = 0x0A }
	Excitation signal output configuration. More...

Functions
int	ad7746_init (ad7746_t dev, const ad7746_params_t params)
	Initializes an AD7746 device.

int	ad7746_read_capacitance_1 (ad7746_t dev, int value)
	Reads the capacitance from the input 1 (CIN1).

int	ad7746_read_capacitance_2 (ad7746_t dev, int value)
	Reads the capacitance from the input 2 (CIN2).

int	ad7746_read_voltage_in (ad7746_t dev, int value)
	Reads the voltage from the external voltage input (VIN).

int	ad7746_read_voltage_vdd (ad7746_t dev, int value)
	Reads the voltage from the VDD pin.

int	ad7746_read_temperature_int (ad7746_t dev, int value)
	Reads the temperature from the internal sensor.

int	ad7746_read_temperature_ext (ad7746_t dev, int value)
	Reads the temperature from the external sensor (see datasheet).

int	ad7746_set_cap_ch_input (const ad7746_t *dev, ad7746_cap_input_t input)
	Sets the current input for the capacitive measurement.If not configured manually, the driver sets the correct mode within the dedicated read function.

int	ad7746_set_vt_ch_mode (ad7746_t *dev, ad7746_vt_mode_t mode)
	Sets the mode for the voltage / temperature channel and updates the descriptor with the new configuration.

int	ad7746_set_vt_sr (const ad7746_t *dev, ad7746_vt_sample_rate_t sr)
	Sets the sample rate for the voltage / temperature channel.

int	ad7746_set_cap_sr (const ad7746_t *dev, ad7746_cap_sample_rate_t sr)
	Sets the sample rate for the capacitance channel.

Data Structures