Features: `Ultra-low power
2.7 V to 3.6 V, 70 A
`Response time: 10 ms
`Adaptive environmental compensation
`1 capacitance input channel
Sensor capacitance (CSENS) 0 pF up to 13 pF
Sensitivity to 1 fF
`EMC tested
`2 modes of operation
Standalone with fixed settings
Interfaced to a microcontroller for user-defined settings
`Proximity detection output flag
`2-wire serial interface (I2C compatible)
`Operating temperature
−40°C to +85°C
`10-lead MSOP packageApplication·Proximity sensing
·Contactless switching
·Position detection
·Level detectionPinout
SpecificationsPositive Supply Voltage VDD to GND........−0.3 V to +3.9 V
Voltage on Any Input or Output to GND.....0.3 V to VDD + 0.3 V
ESD Rating HBM.........................................................4 kV
(ESD Association Human Body Model, S5.1)
ESD Rating FICDM ....................................................1 kV
(Field-Inducted Charged Device Model)
Operating Temperature Range............40°C to +85°C
Storage Temperature Range.............65°C to +150°C
Maximum Junction Temperature............................150°C
MSOP Package
JA, Thermal Impedance-to-Air ................206°C/W
JC, Thermal Impedance-to-Case..............44°C/W
Reflow Soldering (Pb-Free)
Peak Temperature............................260(+0/−5)°C
Time at Peak Temperature.............10 sec to 40 sec
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
| Resolution (Bits) |
12bit |
| T-Put Rate |
100SPS |
| # Chan |
1 |
| Supply V |
Single(+2.7 to +3.6) |
| Pwr Diss |
0.3mW |
| Interface |
I2C/Ser 2-Wire,Ser |
| Ain Range |
0.5 pF,1 pF,2 pF,4 pF |
| SNR (dB) |
n/a |
| Pkg Type |
SOP |
DescriptionThe AD7151 delivers a complete signal processing solution for capacitive proximity sensors, featuring an ultra-low power converter with fast response time. The AD7150 is a 2-channel alternative to the AD7151.
The AD7151 uses Analog Devices, Inc., capacitance-to-digital converter (CDC) technology, which combines features important for interfacing to real sensors, such as high input sensitivity and high tolerance of both input parasitic ground capacitance and leakage current.
The integrated adaptive threshold algorithm compensates for any variations in the sensor capacitance due to environmental factors like humidity and temperature or due to changes in the dielectric material over time.
By default, the AD7151 operates in standalone mode using the fixed power-up settings and indicates detection on a digital output. Alternatively, the AD7151 can be interfaced to a microcontroller via the serial interface, the internal registers can be programmed with user-defined settings, and the data and status can be read from the part.
The AD7151 operates with a 2.7 V to 3.6 V power supply. It is specified over the temperature range of −40°C to +85°C.
AD7151 Data Sheet
