Datasheet ADS1015

VDD
SDA
SCL
GPIO
Microcontroller or
Microprocessor
with I
2
C Port
Inputs Selected
from Configuration
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VDD
1-kto 10-k(typ)
Pullup Resistors
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
SDA
VDD
AIN3
AIN2
ADS1015
1
2
3
4
5
10
9
8
7
6
0.1 …F (typ)
27
ADS1013 , ADS1014 , ADS1015
www.ti.com SBAS473E –MAY 2009–REVISED JANUARY 2018
Product Folder Links: ADS1013 ADS1014 ADS1015
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9 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
9.1 Application Information
The following sections give example circuits and suggestions for using the ADS101x in various situations.
9.1.1 Basic Connections
The principle I
2
C connections for the ADS1015 are shown in Figure 24.
Figure 24. Typical Connections of the ADS1015
The fully-differential voltage input of the ADS101x is ideal for connection to differential sources with moderately
low source impedance, such as thermocouples and thermistors. Although the ADS101x can read bipolar
differential signals, these devices cannot accept negative voltages on either input.
The ADS101x draw transient currents during conversion. A 0.1-μF power-supply bypass capacitor supplies the
momentary bursts of extra current required from the supply.
The ADS101x interface directly to standard mode, fast mode, and high-speed mode I
2
C controllers. Any
microcontroller I
2
C peripheral, including master-only and single-master I
2
C peripherals, operates with the
ADS101x. The ADS101x does not perform clock-stretching (that is, the device never pulls the clock line low), so
it is not necessary to provide for this function unless other clock-stretching devices are on the same I
2
C bus.
Pullup resistors are required on both the SDA and SCL lines because I
2
C bus drivers are open drain. The size of
these resistors depends on the bus operating speed and capacitance of the bus lines. Higher-value resistors
consume less power, but increase the transition times on the bus, thus limiting the bus speed. Lower-value
resistors allow higher speed, but at the expense of higher power consumption. Long bus lines have higher
capacitance and require smaller pullup resistors to compensate. Do not use resistors that are too small because
the bus drivers may not be able to pull the bus lines low.