Datasheet

0.1 F(typ)m
VDD
VDD
SDA
SCL
GPIO
Microcontrolleror
Microprocessor
withI CPort
2
Pull-UpResistors
1k to10k (typ)W W
5
10
1
2
3
4
ADDR
ALERT/RDY
GND
AIN0
AIN1
SCL
9
8
7
6
SDA
VDD
AIN3
AIN2
ADS1015
InputsSelected
fromConfiguration
Register
ADS1013
ADS1014
ADS1015
SBAS473C –MAY 2009–REVISED OCTOBER 2009 www.ti.com
APPLICATION INFORMATION
The following sections give example circuits and The ADS1013/4/5 interface directly to standard mode,
suggestions for using the ADS1013/4/5 in various fast mode, and high-speed mode I
2
C controllers. Any
situations. microcontroller I
2
C peripheral, including master-only
and non-multiple-master I
2
C peripherals, can operate
with the ADS1013/4/5. The ADS1013/4/5 do not
BASIC CONNECTIONS
perform clock-stretching (that is, they never pull the
For many applications, connecting the ADS1013/4/5
clock line low), so it is not necessary to provide for
is simple. A basic connection diagram for the
this function unless other clock-stretching devices are
ADS1015 is shown in Figure 19.
on the same I
2
C bus.
The fully differential voltage input of the ADS1013/4/5
Pull-up resistors are required on both the SDA and
is ideal for connection to differential sources with
SCL lines because I
2
C bus drivers are open-drain.
moderately low source impedance, such as
The size of these resistors depends on the bus
thermocouples and thermistors. Although the
operating speed and capacitance of the bus lines.
ADS1013/4/5 can read bipolar differential signals,
Higher-value resistors consume less power, but
they cannot accept negative voltages on either input.
increase the transition times on the bus, limiting the
It may be helpful to think of the ADS1013/4/5 positive
bus speed. Lower-value resistors allow higher speed
voltage input as noninverting, and of the negative
at the expense of higher power consumption. Long
input as inverting.
bus lines have higher capacitance and require
smaller pull-up resistors to compensate. The resistors
When the ADS1013/4/5 are converting data, they
should not be too small; if they are, the bus drivers
draw current in short spikes. The 0.1μF bypass
may not be able to pull the bus lines low.
capacitor supplies the momentary bursts of extra
current needed from the supply.
Figure 19. Typical Connections of the ADS1015
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Product Folder Link(s): ADS1013 ADS1014 ADS1015