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AD7156BCPZ-REEL Arkusz danych(PDF) 7 Page - Analog Devices

Numer części AD7156BCPZ-REEL
Szczegółowy opis  Ultralow Power, 1.8 V, 3 mm 횞 3 mm, 2-Channel Capacitance Converter
Download  28 Pages
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
Logo AD - Analog Devices

AD7156BCPZ-REEL Arkusz danych(HTML) 7 Page - Analog Devices

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AD7156
Rev. 0 | Page 7 of 28
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
GND 1
VDD 2
CIN2 3
CIN1 4
EXC2 5
SDA
10
SCL
9
OUT2
8
OUT1
7
EXC1
6
AD7156
TOP VIEW
(Not to Scale)
NOTES
1. THE EXPOSED PAD MUST BE CONNECTED TO
GND OR IT MUST BE ISOLATED (FLOATING).
Figure 3. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
Mnemonic
Description
1
GND
Ground Pin.
2
VDD
Power Supply Voltage. This pin should be decoupled to GND using a low impedance capacitor, such as a
0.1 μF X7R multilayer ceramic capacitor.
3
CIN2
CDC Capacitive Input Channel 2. The measured capacitance (sensor) is connected between the EXC2 pin and
the CIN2 pin. If not used, this pin can be left open circuit or be connected to GND. When a conversion is
performed on Channel 2, the CIN2 pin is internally connected to a high impedance input of the Σ-Δ
modulator. When a conversion is performed on the other channel or in idle mode
or power-down mode,
the CIN2 pin is internally disconnected and left floating by the part.
4
CIN1
CDC Capacitive Input Channel 1. The measured capacitance (sensor) is connected between the EXC1 pin and
the CIN1 pin. If not used, this pin can be left open circuit or be connected to GND. When a conversion is
performed on Channel 1, the CIN1 pin is internally connected to a high impedance input of the Σ-Δ
modulator. When a conversion is performed on the other channel or in idle mode
or power-down mode,
the CIN1 pin is internally disconnected and left floating by the part.
5
EXC2
CDC Excitation Output Channel 2. The measured capacitance is connected between the EXC2 pin and the
CIN2 pin. If not used, this pin should be left as an open circuit. When a conversion is performed on Channel 2,
the EXC2 pin is internally connected to the output of the excitation signal driver. When a conversion is per-
formed on the other channel or in idle mode or power-
down mode, the EXC2 pin is internally connected
to GND.
6
EXC1
CDC Excitation Output Channel 1. The measured capacitance is connected between the EXC1 pin and the
CIN1 pin. If not used, this pin should be left as an open circuit. When a conversion is performed on Channel 1,
the EXC1 pin is internally connected to the output of the excitation signal driver. When a conversion is per-
formed on the other channel or in idle mode or power-
down mode, the EXC1 pin is internally connected
to GND.
7
OUT1
Logic Output Channel 1. A high level on this output indicates proximity detected on CIN1.
8
OUT2
Logic Output Channel 2. A high level on this output indicates proximity detected on CIN2.
9
SCL
Serial Interface Clock Input. This pin connects to the master clock line and requires a pull-up resistor if not
provided elsewhere in the system.
10
SDA
Serial Interface Bidirectional Data. This pin connects to the master data line and requires a pull-up resistor if
not provided elsewhere in the system.


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