adafruit_tla202x

Library for the TI TLA202x 12-bit ADCs

  • Author(s): Bryan Siepert

Implementation Notes

Hardware:

Software and Dependencies:

class adafruit_tla202x.CV

struct helper

classmethod add_values(value_tuples: Tuple[str, int, float | str, float | None]) → None

creates CV entires

classmethod is_valid(value: int) → bool

Returns true if the given value is a member of the CV

class adafruit_tla202x.DataRate

Options for data_rate, to select the rate at which samples are taken while measuring the voltage across the input pins

Rate

Measurement Rate

Rate.RATE_128SPS

128 Samples per second

Rate.RATE_250SPS

250 Samples per second

Rate.RATE_490SPS

490 Samples per second

Rate.RATE_920SPS

920 Samples per second

Rate.RATE_1600SPS

1600 Samples per second

Rate.RATE_2400SPS

2400 Samples per second

Rate.RATE_3300SPS

3300 Samples per second
class adafruit_tla202x.Mode

Options for mode

Mode

Description

Mode.CONTINUOUS

In Continuous mode, measurements are taken

continuously and getting voltage

will return the latest measurement.

Mode.ONE_SHOT

Setting the mode to ONE_SHOT takes a single

measurement and then goes into a low power state.
class adafruit_tla202x.Mux

Options for mux to choose the inputs that voltage will be measured across

Mux

Positive Pin

Negative Pin

Mux.MUX_AIN0_AIN1

AIN 0

AIN 1

Mux.MUX_AIN0_AIN3

AIN 0

AIN 3

Mux.MUX_AIN1_AIN3

AIN 1

AIN 3

Mux.MUX_AIN2_AIN3

AIN 2

AIN 3

Mux.MUX_AIN0_GND

AIN 0

GND

Mux.MUX_AIN1_GND

AIN 1

GND

Mux.MUX_AIN2_GND

AIN 2

GND

Mux.MUX_AIN3_GND

AIN 3

GND
class adafruit_tla202x.Range

Options for range, used to select the measurement range by adjusting the gain of the internal amplifier

Range

Measurement Range

Resolution

Range.RANGE_6_144V

±6.144 V

3 mV

Range.RANGE_4_096V

±4.096 V

2 mV

Range.RANGE_2_048V

±2.048 V

1 mV

Range.RANGE_1_024V

±1.024 V

0.5 mV

Range.RANGE_0_512V

±0.512 V

0.25 mV
class adafruit_tla202x.TLA2024(i2c_bus: I2C, address: int = 72)

I2C Interface for analog voltage measurements using the TI TLA2024 12-bit 4-channel ADC

param ~I2C i2c_bus:

The I2C bus that the ADC is on.

param int address:

The I2C address for the ADC. Defaults to ~0x48

property data_rate: int

Selects the rate at which measurement samples are taken. Must be a DataRate . See the documentation for DataRate for more information

property input_channel: int

The input channel number (0-4) to measure the voltage at, referenced to GND.

property mode: int

The measurement mode of the sensor. Must be a Mode. See the documentation for Mode for more information

property mux: int

selects the inputs that voltage will be measured between. Must be a Mux. See the Mux documentation for more information about the available options

property range: int

The measurement range of the ADC, changed by adjusting the Programmable Gain Amplifier range must be a Range. See the documentation for Range for more information

read(channel: int) → int

Switch to the given channel and take a single ADC reading in One Shot mode

Parameters:

channel (int) – The channel number to switch to, from 0-3

property voltage: float

The voltage between the two selected inputs

analog_in

AnalogIn for ADC readings.

  • Author(s): Bryan Siepert

class adafruit_tla202x.analog_in.AnalogIn(tla, pin)

AnalogIn Mock Implementation for ADC Reads.

Parameters:

  • tla – The TLA202x object.

  • pin (DigitalInOut) – Required ADC channel pin.

deinit()

Release the reference to the TLA202x. Create a new AnalogIn to use it again.

property reference_voltage

The maximum voltage measurable (also known as the reference voltage) as a float in Volts. Assumed to be 3.3V but can be overridden using the TLA2024 constructor

property value

Returns the value of an ADC channel. The value is scaled to a 16-bit integer from the native 12-bit value.

property voltage

Returns the value of an ADC channel in volts as compared to the reference voltage.