AD7151BRMZ Analog Devices Inc, AD7151BRMZ Datasheet - Page 13

• Manufacturer Part Number: AD7151BRMZ
• Description: IC CAP CONV 1CH ULT LP 10MSOP
• Manufacturer: Analog Devices Inc
• Type: Capacitance-to-Digital Converterr

Specifications of AD7151BRMZ

• Input Type: Voltage
• Output Type: Digital
• Interface: 2-Wire Serial
• Current - Supply: 120µA
• Mounting Type: Surface Mount
• Package / Case: 10-MSOP, Micro10™, 10-uMAX, 10-uSOP
• Resolution (bits): 12bit
• Sampling Rate: 100SPS
• Input Channel Type: Single Ended
• Data Interface: 2-Wire, I2C, Serial
• Supply Voltage Range - Analog: 2.7V To 3.6V
• Supply Current: 70µA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

AUTOCAPDAC ADJUSTMENT
In adaptive threshold mode, the part can dynamically adjust the
CAPDAC to keep the CDC in an optimal operating capacitive
range. When the AutoDAC function is enabled, the CAPDAC
value is automatically incremented when the data average
exceeds three-fourths of the CDC full range, and the CAPDAC
value is decremented when the data average goes below one-
fourth of the CDC full range. The AutoDAC increment or
decrement step depends on the selected CDC capacitive input
range. See the Setup Register section.
POWER-DOWN TIMER
In power sensitive applications, the AD7151 can be set to
automatically enter power-down mode after a programmed
period of time in which the output has not been activated. The
AD7151 can be then returned to a normal operational mode
either via the serial interface or by the power supply off/on
sequence.
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POWER SUPPLY MONITOR
When the AD7151 V
defined level needed for correct CDC operation, the on-chip
power supply monitor stops the adaptive threshold logic and
holds it in reset. After the V
threshold logic is released, and the data average is reset to the
value of the first conversion finished at the correct power supply
voltage.
This feature prevents the adaptive threshold from being set
incorrectly after a very slow rise of the V
corrupted by accidental drops in the V
The other AD7151 functions continue working below the
power supply monitor threshold, down to approximately
1.0V..1.8V, the exact level depending on the manufacturing
process variation. In the region of the low V
is still accessible via the serial interface and continues conversion.
However, the conversion results may be incorrect and,
therefore, the data should not be considered valid if the part
operates below the power supply monitor threshold.
The status of the power supply monitor can be determined by
reading the PwrDown bit in the AD7151 status register.
DD
power supply voltage drops below a
DD
reaches the required level, the
DD
DD
voltage.
voltage or from being
DD
voltage, the part
AD7151