ADS1113 datasheet(12/49 Pages) TI2

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7.3.7 Digital Comparator (ADS1014 and ADS1015 Only)

The ADS1015 and ADS1014 feature a programmable digital comparator that can issue an alert on the

ALERT/RDY pin. The COMP_MODE bit in the Config register configures the comparator as either a traditional

comparator or a window comparator. In traditional comparator mode, the ALERT/RDY pin asserts (active low by

default) when conversion data exceeds the limit set in the high-threshold register (Hi_thresh). The comparator

then deasserts only when the conversion data falls below the limit set in the low-threshold register (Lo_thresh).

In window comparator mode, the ALERT/RDY pin asserts when the conversion data exceed the Hi_thresh

In either window or traditional comparator mode, the comparator can be configured to latch after being asserted

by the COMP_LAT bit in the Config register. This setting causes the assertion to remain even if the input signal

is not beyond the bounds of the threshold registers. This latched assertion can only be cleared by issuing an

SMBus alert response or by reading the Conversion register. The ALERT/RDY pin can be configured as active

high or active low by the COMP_POL bit in the Config register. Operational diagrams for both the comparator

modes are shown in Figure 7-7.

The comparator can also be configured to activate the ALERT/RDY pin only after a set number of

successive readings exceed the threshold values set in the threshold registers (Hi_thresh and Lo_thresh). The

COMP_QUE[1:0] bits in the Config register configures the comparator to wait for one, two, or four readings

beyond the threshold before activating the ALERT/RDY pin. The COMP_QUE[1:0] bits can also disable the

comparator function, and put the ALERT/RDY pin into a high state.

TH_H

TH_L

Time

Successful

SMBus Alert

Response

Successful

SMBus Alert

Response

Latching

Comparator

Output

Non-Latching

Comparator

Output

Input Signal

TH_H

TH_L

Time

Successful

SMBus Alert

Response

Latching

Comparator

Output

Non-Latching

Comparator

Output

Input Signal

WINDOW COMPARATOR MODE

TRADITIONAL COMPARATOR MODE

Figure 7-7. ALERT Pin Timing Diagram

ADS1013, ADS1014, ADS1015

SBAS473F – MAY 2009 – REVISED JANUARY 2025

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