Datasheet

Evaluating Performance with the ADCPro Software

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The I2C Address groupbox contains controls related to the setting of the I

C address of Device 1. The

JMP2 Settings control is set up to mimic the layout of JMP2 on the EVM. When, for example, a jumper is

installed in the rightmost position, connecting the ADS1115 ADDR pin to GND, the GND radio button

should be selected here.

Whenever the JMP2 settings are changed, the I

C address of the device is changed, and the

corresponding address value is shown in the 7 bit and 8 bit indicators. The 7 bit indicator shows the

address considering only the seven bits that set the address of the device; the 8 bit indicator reflects how

a byte would actually be viewed if the eighth bit (the R/W bit) is set to zero.

The ACK light will reflect whether or not the address selected returns an I

C acknowledgement. If this light

is red, then no device was found at that address. This result may indicate that the jumper settings on the

EVM do not match the selection in the JMP2 Settings. A red light may also indicate that the two devices

on the board have been set to the same I

C address, and this state will be indicated by a message at the

top of the plug-in that says I2C Address Conflict. The two devices on the ADS1115EVM must be set for

different I

C addresses in order for the plug-in to operate. When a valid I

C address is selected, the ACK

light will turn green, indicating that a valid address has been found on the bus.

The Mux Setting control determines which set of inputs is used, displayed as AINP:AINN, where AINP is

the input connected to the positive input of the ADC, and AINN is the input connected to the negative input

of the ADC. Selections available are AIN0:AIN1, AIN0:AIN3, AIN1:AIN3, AIN2:AIN3, AIN0:GND,

AIN1:GND, AIN2:GND, or AIN3:GND.

The PGA Gain control sets the PGA gain. Selections available are 0.66666, 1, 2, 4, 8, or 16.

The Comparator groupbox contains controls related to the comparator functions of the ADS1115. The

Queue control selects whether to Disable Comparator, or to enable the comparator and have it Assert

after one conversion, Assert after two conversions, or Assert after four conversions. The comparator

output status is reflected by the D1 LED on the EVM.

The Mode switch allows selection of the comparator mode, either Traditional or Window. The Action

switch selects between Non-latching or Latching operation, and the Polarity switch determines if the

ALERT output of the device is Active Low or Active High. More details on these settings can be found in

the product data sheet.

The LO_THRESH and HI_THRESH controls set the numbers that are placed in corresponding low and

high threshold registers of the ADS1115. These numbers are displayed and entered in decimal format.

7.1.3 Device 2 Tab

This tab is identical to the Device 1 tab, but controls the settings for Device 2, which is U2 on the

ADS1115EVM.

ADS1015EVM, ADS1115EVM, ADS1015EVM-PDK, and ADS1115EVM-PDK SBAU157B–August 2009–Revised May 2011

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