This version (10 Dec 2020 12:05) was approved by Cristian Pop.The Previously approved version (10 Dec 2020 11:40) is available.
Table of Contents
AD7091R5 User Guide
Overview
The AD7091R-5 is a 12-bit, multichannel, ultra low power, successive approximation analog-to-digital converter (ADC). The AD7091R-5 operates from a single 2.7 V to 5.25 V power supply and typically consumes only 24 µA at a 3 V supply in fast mode. The AD7091R-5 provides a 2-wire serial interface compatible with I2C interfaces. The conversion process can be controlled by a sample mode via the CONVST/GPO1 pin, an autocycle mode selected through software control, or a command mode in which conversions occur across I2C write operations. The device contains a wide bandwidth track-and-hold amplifier that can handle input frequencies up to 1.5 MHz. The AD7091R-5 also features an on-chip conversion clock, an on-chip accurate 2.5 V reference, and a programmable out of bounds user alert function. The AD7091R-5 offers four single-ended analog input channels with a channel sequencer that allows a preprogrammed selection of channels to be converted sequentially. The AD7091R-5 uses advanced design techniques to achieve ultra low power dissipation without compromising performance. It also features flexible power management options. An on-chip configuration register allows the user to set up different operating conditions. These include power management, alert functionality, busy indication, channel sequencing, and general-purpose output pins. The MUXOUT and ADCIN pins allow signal conditioning of the multiplexer output before acquisition by the ADC.
Supported devices
Evaluation board
No-OS Driver Description
Functions Declarations
| Function | Description |
|---|---|
int32_t ad7091r5_init(struct ad7091r5_dev **device, struct ad7091r5_init_param *init_param); | Initialize the device. |
int32_t ad7091r5_remove(struct ad7091r5_dev *dev); | Remove the device and release resources. |
int32_t ad7091r5_set_mode(struct ad7091r5_dev *dev, enum ad7091r5_mode mode); | Set device mode. |
int32_t ad7091r5_sleep_mode(struct ad7091r5_dev *dev, enum ad7091r5_sleep_mode mode); | Set device sleep mode. |
int32_t ad7091r5_set_port(struct ad7091r5_dev *dev, enum ad7091r5_port port, bool value); | Set device set port value. |
int32_t ad7091r5_set_gpo0_mode(struct ad7091r5_dev *dev, enum ad7091r5_gpo0_mode mode, bool is_cmos); | Set device set GPO0 mode. |
int32_t ad7091r5_set_cycle_timer(struct ad7091r5_dev *dev, enum ad7091r5_cycle_timer timer); | Set cycle timer for autocycle mode. |
int32_t ad7091r5_set_limit(struct ad7091r5_dev *dev, enum ad7091r5_limit limit, uint8_t channel, uint16_t value); | Set high limit, low limit, hysteresis. |
int32_t ad7091r5_get_alert(struct ad7091r5_dev *dev, uint8_t channel, enum ad7091r5_alert_type *alert); | Get alert. |
int32_t ad7091r5_get_limit(struct ad7091r5_dev *dev, enum ad7091r5_limit limit, uint8_t channel, uint16_t *value); | Get high limit, low limit, hysteresis. |
int32_t ad7091r5_set_channel(struct ad7091r5_dev *dev, uint8_t channel); | Select device channel. |
int32_t ad7091r5_read_one(struct ad7091r5_dev *dev, uint8_t channel, uint16_t *read_val); | Read one sample. |
Types Declarations
/** * @enum ad7091r5_mode * @brief Converter supported modes */ enum ad7091r5_mode { /** Sample mode, conversion started by CONVST */ AD7091R5_MODE_SAMPLE, /** Command mode, conversion starts on the first pos edge of SCL */ AD7091R5_MODE_COMMAND, /** Sample mode, convert continuously */ AD7091R5_MODE_AUTOCYCLE, }; /** * @enum ad7091r5_sleep_mode * @brief Converter supported sleep modes */ enum ad7091r5_sleep_mode { /** Default operation: * Sleep mode Off, Internal reference Off */ AD7091R5_SLEEP_MODE_0, /** Sleep mode Off, Internal reference On */ AD7091R5_SLEEP_MODE_1, /** Sleep mode On, Internal reference Off */ AD7091R5_SLEEP_MODE_2, /** Sleep mode On, Internal reference On */ AD7091R5_SLEEP_MODE_3, }; /** * @enum ad7091r5_port * @brief Converter general purpose outputs */ enum ad7091r5_port { /** GPO0 */ AD7091R5_GPO0, /** GPO1 */ AD7091R5_GPO1, /** GPO2 */ AD7091R5_GPO2, }; /** * @enum ad7091r5_gpo0_mode * @brief Port 0 configuration */ enum ad7091r5_gpo0_mode { /** GPO0 is output port */ AD7091R5_GPO0_ENABLED, /** GPO0 is Alert indicator */ AD7091R5_GPO0_ALERT, /** GPO0 is busy indicator, device is converting */ AD7091R5_GPO0_BUSY, }; /** * @enum ad7091r5_cycle_timer * @brief Timer used for autocycle mode */ enum ad7091r5_cycle_timer { /** 100 uS */ AD7091R5_CYCLE_TIMER_100uS, /** 200 uS */ AD7091R5_CYCLE_TIMER_200uS, /** 400 uS */ AD7091R5_CYCLE_TIMER_400uS, /** 800 uS */ AD7091R5_CYCLE_TIMER_800uS, }; /** * @enum ad7091r5_alert_type * @brief Alert status */ enum ad7091r5_alert_type { /** No alert */ AD7091R5_NO_ALERT, /** High alert */ AD7091R5_HIGH_ALERT, /** Low alert */ AD7091R5_LOW_ALERT, }; /** * @enum ad7091r5_limit * @brief Limit type */ enum ad7091r5_limit { /** Low limit */ AD7091R5_LOW_LIMIT, /** High limit */ AD7091R5_HIGH_LIMIT, /** Hysteresis */ AD7091R5_HYSTERESIS, }; /** * @struct ad7091r5_init_param * @brief Structure containing the init parameters needed by the ad7091r5 device */ struct ad7091r5_init_param { /* I2C */ i2c_init_param *i2c_init; /** RESET GPIO initialization structure. */ struct gpio_init_param *gpio_resetn; }; /** * @struct ad7091r5_dev * @brief Structure representing an ad7091r5 device */ struct ad7091r5_dev { /* I2C descriptor */ struct i2c_desc *i2c_desc; /** RESET GPIO handler. */ struct gpio_desc *gpio_resetn; }; |
No-OS Downloads
resources/eval/user-guides/ad7091r5.txt · Last modified: 10 Dec 2020 12:05 by Cristian Pop