ADS1x15

Read digital output data from ADS1015 and ADS1115 ADCs

Since R2023a

Add-On Required: This feature requires the Simulink Support Package for Raspberry Pi Hardware add-on.

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Libraries:
Simulink Support Package for Raspberry Pi Hardware / Basic

Description

Use the ADS1x15 analog-to-digital converter block to perform analog-to-digital conversion of signals connected to the selected ADC input pins. The block outputs digital values representing the analog input signal and stores the converted values in the result register of your digital signal processor. You use this block to capture and digitize analog signals from external sources such as signal generators, frequency generators, or audio devices. With the ADS1x15 block, you can configure for ADS1015 and ADS1115 converter, that provides a 12-bit and 16-bit precision digital output, respectively.

Ports

Output

data — ADC digital data

scalar

The block outputs the converted digital data of analog channel. For ADS1015 converter, the digital output values are in the range 0 to 4095 while, for ADS1115 converter, the digital output values are in the range 0 to 65535.

Data Types: int16

Parameters

Basic

ADC chip — ADC converter IC

ADS1015 (default) | ADS1115

Select an ADC converter integrated circuit (IC) for performing analog to digital conversion. The ADS1015 IC is a 12-bit ADC while, the ADS1115 IC is a 16-bit ADC.

I2C address — I2C address for ADS1x15 IC

0x48 (default) | 0x49 | 0x4A | 0x4B

Select the I2C address for ADS1x15 ADC for communicating with the Raspberry Pi^® board. The ADS1x15 ADC can have four I2C addresses depending on the logic level on pins SCL and SDA.

I2C Address	ADC Address Pin
0x48	GND
0x49	VIN
0x4A	SDA
0x4B	SCL

Conversion mode — ADC conversion mode

Single-shot (default) | Continuous

• Single-shot — In this mode, the ADC performs only one analog-to-digital conversion at the specified sample time and writes to the ADC result data registers.

• Continuous — In this mode, the analog input is continually converted to its digital equivalent and written to the ADC result data registers.

Input channel — Analog input channel of ADC converter

AINP0N1 (default) | AINP0N3 | AINP1N3 | AINP2N3 | AINP0NG | AINP1NG | AINP2NG | AINP3NG

Select the analog input channel of the ADC converter.

Gain — Amplify input analog signal

+/-2.048V (default) | +/-6.144V | +/-4.096V | +/-1.024V | +/-0.512V | +/-0.256V

Select the gain of the ADC converter to amplify the weak input analog signal.

Data rate — Data conversion rate

1600SPS (default) | 128SPS | 250SPS | 490SPS | 920SPS | 2400SPS | 3300SPS

Select the analog-to-digital conversion rate of the ADC converter in samples per second (SPS).

Sample time — Interval at which block reads data

0.01 (default) | scalar

Enter the time in seconds between consecutive sets of samples that are converted for the selected input channel. This is the rate at which values are read from the result registers.

Advanced

Enable comparator — Enable advanced ADC options

off (default) | on

Select this option to enable advanced functions useful for ADC applications.

Mode — ADC comparator mode

Traditional with hysteresis (default) | Window

Select the comparator mode of operation for ALERT pin on ADC chip.

• Traditional with hysteresis — In this mode, the ALERT pin on the ADC chip asserts when conversion data exceeds the limit set in the high threshold register. The comparator then de-asserts when the input signal falls below the low threshold register value.

• Window — In this mode, the ALERT pin asserts is the conversion data exceeds the high threshold register or falls below the low threshold register.

Dependencies

• To enable this parameter, select Enable comparator.

Polarity configuration — ADC comparator polarity configuration

Active low (default) | Active high

Select the comparator polarity for the ALERT pin on ADC chip.

• Active low — Assert on the ALERT pin of the ADC chip on the falling edge of the digital output signal.

• Active high — Assert on the ALERT pin of the ADC chip on the rising edge of the digital output signal.

Dependencies

• To enable this parameter, select Enable comparator.

Latching configuration — ADC comparator latching configuration

Non-latching (default) | Latching

Select the latching configuration of the ALERT pin on the ADC chip.

• Non-latching — Select this option to clear away the assertion on the ALERT ping of the ADC chip when the input analog signal is not beyond the low and high threshold values.

• Latching — Select this option for the assertion to continue on the ALERT pin of the ADC chip even if the input analog signal is not beyond the low and high threshold values.

Dependencies

• To enable this parameter, select Enable comparator.

Queue configuration — Queue configuration before asserting ALERT pin of ADC chip

Assert after 1 conversion (default) | Assert after 2 conversions | Assert after 4 conversions

Select the option to control the number of successive conversions exceeding the upper or lower thresholds required before asserting the ALERT pin of the ADC chip.

Dependencies

• To enable this parameter, select Enable comparator.

Low threshold — Low threshold for queue configuration

0 (default) | scalar

Enter the lower threshold value for queue configuration before asserting the ALERT pin of the ADC chip.

Dependencies

• To enable this parameter, select Enable comparator.

High threshold — High threshold for queue configuration

0 (default) | scalar

Enter the higher threshold value for queue configuration before asserting the ALERT pin of the ADC chip.

Dependencies

• To enable this parameter, select Enable comparator.

Version History

Introduced in R2023a