sparkfun Qwiic 12-Bit ADC Hook-Up Manual page 11

The ADS1015 features a programmable digital comparator that can trigger the ALERT/RDY pin to indicate when
conversion data is ready. By default, the comparator is disabled. However, when activated, the comparator
operates in either a traditional or window mode. The upper and lower thresholds for the comparator are set by the
last two registers on the ADS1015; while, the polarity (active low/high), latching or non-latching, operational mode,
and enabling of the ALERT/RDY pin are set in the Config register.
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Qwiic or I C
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I C Address
The ADS1015 has 4 available I C addresses, which are set by the address pin, ADDR. On the Qwiic ADC, the
default slave address of the ADS1015 is 0x48 (HEX) of 7-bit addressing, following I C protocol. The ADS1015
does have an additional general call address that can be used to reset all internal registers and power down the
ADS1015 (see datasheet).
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Default I C Slave Address: 0x48
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I C Registers
The ADS1015 has four 16-bit registers, which are accessible through the I C bus using the Address Pointer
register. The Address Pointer register is an 8-bit byte that is written immediately after the slave address byte, low
R/W bit.
Address Description
Address Pointer Register (8-bit): Used to grant R/W access to the four available registers on the
N/A
ADS1015.
0x00 Conversion Register (16-bit): Contains result of last conversion (i.e. measurement).
0x01 Config Register (16-bit): Used the for configuration setting of the ADS1015.
0x02 Low Threshold Register (16-bit): Low threshold value for digital comparator.
0x03 High Threshold Register (16-bit): High threshold value for digital comparator.
Connections
The simplest way to use the Qwiic ADC is through the Qwiic connect system. The connectors are polarized for the
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I C connection and power. (*They are tied to their corresponding breakout pins.)
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