ADS1113 datasheet(20/50 Pages) TI

20 / 50 page

8.4 Device Functional Modes

8.4.1 Reset and Power-Up

The ADS111x-Q1 reset on power-up and set all the bits in the Config register to the respective default settings.

The ADS111x-Q1 enter a power-down state after completion of the reset process. The device interface and

digital blocks are active, but no data conversions are performed. The initial power-down state of the ADS111x-

Q1 relieves systems with tight power-supply requirements from encountering a surge during power-up.

The ADS111x-Q1 respond to the I2C general-call reset commands. When the ADS111x-Q1 receive a general call

reset command (06h), an internal reset is performed as if the device is powered-up.

8.4.2 Operating Modes

The ADS111x-Q1 operate in one of two modes: continuous-conversion or single-shot. The MODE bit in the

Config register selects the respective operating mode.

8.4.2.1 Single-Shot Mode

When the MODE bit in the Config register is set to 1b, the ADS111x-Q1 enter a power-down state, and operate

in single-shot mode. This power-down state is the default state for the ADS111x-Q1 when power is first applied.

Although powered down, the devices still respond to commands. The ADS111x-Q1 remain in this power-down

state until a 1b is written to the operational status (OS) bit in the Config register. When the OS bit is asserted,

the device powers up in approximately 25 μs, resets the OS bit to 0b, and starts a single conversion. When

conversion data are ready for retrieval, the device powers down again. Writing a 1b to the OS bit while a

conversion is ongoing has no effect. To switch to continuous-conversion mode, write a 0b to the MODE bit in the

Config register.

8.4.2.2 Continuous-Conversion Mode

In continuous-conversion mode (MODE bit set to 0b), the ADS111x-Q1 perform conversions continuously. When

a conversion is complete, the ADS111x-Q1 place the result in the Conversion register and immediately begin

another conversion. When writing new configuration settings, the currently ongoing conversion completes with

the previous configuration settings. Thereafter, continuous conversions with the new configuration settings start.

To switch to single-shot conversion mode, write a 1b to the MODE bit in the configuration register or reset the

device.

8.4.3 Duty Cycling For Low Power

The noise performance of a ΔΣ ADC generally improves when lowering the output data rate because more

samples of the internal modulator are averaged to yield one conversion result. In applications where power

consumption is critical, the improved noise performance at low data rates is not always required. For these

applications, the ADS111x-Q1 support duty cycling that yield significant power savings by periodically requesting

high data rate readings at an effectively lower data rate. For example, an ADS111x-Q1 in power-down state with

a data rate set to 860 SPS can be operated by a microcontroller that instructs a single-shot conversion every

125 ms (8 SPS). A conversion at 860 SPS only requires approximately 1.2 ms, so the ADS111x-Q1 enter power-

down state for the remaining 123.8 ms. In this configuration, the ADS111x-Q1 consume approximately 1/100th

the power that is otherwise consumed in continuous-conversion mode. The duty cycling rate is completely

arbitrary and is defined by the controller. The ADS111x-Q1 offer lower data rates that do not implement duty

cycling and also offer improved noise performance if required.

ADS1113-Q1, ADS1114-Q1, ADS1115-Q1

SBAS563E – DECEMBER 2011 – REVISED DECEMBER 2022

www.ti.com

Submit Document Feedback

Product Folder Links: ADS1113-Q1 ADS1114-Q1 ADS1115-Q1

ADS1113 Datasheet(PDF) 20 Page - Texas Instruments

ADS1113 Datasheet(HTML) 20 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

Datasheet Download

Link URL