ADS1113 datasheet(28/49 Pages) TI2

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9.1.7 Quick-Start Guide

This section provides a brief example of ADS101x communications. Hardware for this design includes: one

ADS101x configured with an I2C address of 1001000b; a microcontroller with an I2C interface; discrete

components such as resistors, capacitors, and serial connectors; and a 2V to 5V power supply. Figure 9-5

shows the basic hardware configuration.

The ADS101x communicate with the controller (microcontroller) through an I2C interface. The controller provides

a clock signal on the SCL pin and data are transferred using the SDA pin. The ADS101x never drive the SCL

pin. For information on programming and debugging the microcontroller being used, see the device-specific

product data sheet.

The first byte sent by the controller is the ADS101x address, followed by the R/W bit that instructs the ADS101x

to listen for a subsequent byte. The second byte is the Address Pointer register byte. The third and fourth bytes

sent from the controller are written to the register indicated in register address pointer bits P[1:0]. See Figure 7-9

and Figure 7-10 for read and write operation timing diagrams, respectively. All read and write transactions with

the ADS101x must be preceded by a START condition, and followed by a STOP condition.

For example, to write to the configuration register to set the ADS101x to continuous-conversion mode and then

read the conversion result, send the following bytes in this order:

1. Write to Config register:

• First byte: 10010000b (first 7-bit I2C address followed by a low R/W bit)

• Second byte: 00000001b (points to Config register)

• Third byte: 10000100b (MSB of the Config register to be written)

• Fourth byte: 10000011b (LSB of the Config register to be written)

2. Write to Address Pointer register:

• First byte: 10010000b (first 7-bit I2C address followed by a low R/W bit)

• Second byte: 00000000b (points to Conversion register)

3. Read Conversion register:

• First byte: 10010001b (first 7-bit I2C address followed by a high R/W bit)

• Second byte: the ADS101x responds with the MSB of the Conversion register

• Third byte: the ADS101x responds with the LSB of the Conversion register

VDD

GND

SCL

SDA

ADDR

ALERT

(ADS1014/5 Only)

AIN0

AIN1

AIN2 (ADS1015 Only)

AIN3 (ADS1015 Only)

SCL (P1.6)

SDA (P1.7)

C-Capable Controller

(MSP430F2002)

ADS101x

3.3 V

VDD

GND

JTAG

Serial/UART

3.3 V

10 k

0.1 µF

10 k

3.3 V

0.1 µF

Figure 9-5. Basic Hardware Configuration

ADS1013, ADS1014, ADS1015

SBAS473F – MAY 2009 – REVISED JANUARY 2025

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