參數(shù)資料
型號(hào)： AD7747
廠商： Analog Devices, Inc.
元件分類(lèi)： 溫度/濕度傳感器
英文描述： 24-Bit Capacitance-to-Digital Converter with Temperature Sensor
中文描述： 24位的電容數(shù)字轉(zhuǎn)換器的溫度傳感器
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 200K
代理商： AD7747
Preliminary Technical Data
AD7747
PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS
Rev. PrC| Page 7 of 20
TOP VIEW
(Not to Scale)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
AD7747
CIN1(+)
SCL
RDY
SHLD
TST
CIN1(
-
)
REFIN(
-
)
REFIN(+)
NC
SDA
NC
VDD
GND
NC
VIN(+)
VIN(
-
)
Figure 3. AD7747 Pin Configuration (16-Lead TSSOP)
Table 4. Pin Function Descriptions
Pin
No.
1
SCL
Mnemonic
Description
Serial Interface Clock Input. Connects to the master clock line. Requires pull-up resistor if not already provided in
the system.
Logic Output. A falling edge on this output indicates that a conversion on enabled channel(s) has been finished
and the new data is available. Alternatively, the status register can be read via the 2-wire serial interface and the
relevant bit(s) decoded to query the finished conversion. If not used, this pin should be left as an open circuit.
Capacitive input active AC shielding. To eliminate the CIN parasitic capacitance to ground, the SHLD signal can be
used to for shielding the connection between the sensor and CIN. See the max allowed capacitance. If not used,
this pin should be left as an open circuit.
This pin must be left as an open circuit for proper operation.
Differential Voltage Reference Input for the Voltage Channel (ADC). Alternatively, the on-chip internal reference can
be used for the voltage channel. These reference input pins are not used for conversion on capacitive channel(s)
(CDC). If not used, these pins can be left as an open circuit or connected to GND.
CDC Negative Capacitive Input in Differential Mode. This pin is internally disconnected in single-ended CDC
configuration. If not used, this pin should be left as an open circuit.
CDC capacitive input (in single ended mode) or positive capacitive input (in differential mode). The measured
capacitance is connected between one of the CIN pins and GND. If not used, this pin should be left as an open
circuit.
Not Connected. These pins should be left as an open circuit.
Differential Voltage Input for the Voltage Channel (ADC). These pins are also used to connect an external
temperature sensing diode. If not used, these pins can be left as an open circuit or connected to GND.
Ground Pin.
Power Supply Voltage. This pin should be decoupled to GND, using a low impedance capacitor, for example in
combination with a 10 μF tantalum and a 0.1 μF multilayer ceramic.
Not Connected. This pin should be left as an open circuit.
Serial Interface Bidirectional Data. Connects to the master data line. Requires a pull-up resistor if not provided
elsewhere in the system.
2
RDY
3
SHLD
4
5, 6
TST
REFIN(+),
REFIN(–)
7
CIN1(–)
8
CIN1(+)
9, 10
11,
12
13
14
NC
VIN(+), VIN(–)
GND
VDD
15
16
NC
SDA
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