參數(shù)資料
型號(hào)： ADT7411ARQ
廠商： Analog Devices, Inc.
元件分類(lèi)： 溫度/濕度傳感器
英文描述： SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC
中文描述： SPI/I2C兼容，10位數(shù)字溫度傳感器和8通道ADC
文件頁(yè)數(shù)： 15/36頁(yè)
文件大小： 456K
代理商： ADT7411ARQ
ADT7411
ADC Transfer Function
The output coding of the ADT7411 analog inputs is straight
binary. The designed code transitions occur midway between
successive integer LSB values (i.e., 1/2 LSB, 3/2 LSB). The LSB is
V
DD
/1024 or Int V
REF
/1024, Int V
REF
= 2.25 V. The ideal transfer
characteristic is shown in Figure 24.
Rev. A | Page 15 of 36
0
111...111
111...110
111...000
011...111
+V
REF
– 1LSB
ANALOG INPUT
0V 1/2 LSB
A
1LSB = INT V
REF
/1024
1LSB = V
DD
/1024
000...010
000...001
000...000
Figure 24. Transfer Function
To work out the voltage on any analog input channel, the
following method can be used:
( )
1024
1
ference
Re
LSB
=
Convert the value read back from the AIN value register into
decimal.
( )
size
LSB
AINValue
AINVoltage
×
=
where
d
= decimal
Example:
Internal reference used. Therefore, V
REF
= 2.25 V.
V
AINVoltage
V
.
×
size
LSB
d
value
AIN
1
125
.
10
197
512
10
197
.
1024
25
.
512
3
3
=
×
=
×
=
=
=
Analog Input ESD Protection
Figure 26 shows the input structure that provides ESD protec-
tion on any of the analog input pins. The diode provides the
main ESD protection for the analog inputs. Care must be taken
that the analog input signal never drops below the GND rail by
more than 200 mV. If this happens, the diode will become
forward biased and start conducting current into the substrate.
The 4 pF capacitor is the typical pin capacitance and the resistor
is a lumped component made up of the on resistance of the
multiplexer switch.
0
BIAS
DIODE
INTERNAL
SENSE
TRANSISTOR
V
DD
TO ADC
V
OUT+
V
OUT–
I
N
×
I
I
BIAS
Figure 25. Top Level Structure of Internal Temperature Sensor
0
4pF
AIN
100
Figure 26. Equivalent Analog Input ESD Circuit
AIN Interrupts
The measured results from the AIN inputs are compared with
the AIN V
HIGH
(greater than comparison) and V
LOW
(less than or
equal to comparison) limits. An interrupt occurs if the AIN
inputs exceed or equal the limit registers. These voltage limits
are stored in on-chip registers. Note that the limit registers are
eight bits long while the AIN conversion result is 10 bits long.
If the voltage limits are not masked out, any out-of-limit
comparisons generate flags that are stored in the Interrupt
Status 1 register (Address 00h) and one or more out-of-limit
results will cause the INT/INT output to pull either high or low,
depending on the output polarity setting. It is good design prac-
tice to mask out interrupts for channels that are of no concern
to the application. Figure 27 shows the interrupt structure for
the ADT7411. It shows a block diagram representation of how
the various measurement channels affect the INT/INT pin.
FUNCTIONAL DESCRIPTION—MEASUREMENT
Temperature Sensor
The ADT7411 contains an A/D converter with special input
signal conditioning to enable operation with external and on-
chip diode temperature sensors. When the ADT7411 is oper-
ating in single-channel mode, the A/D converter continually
processes the measurement taken on one channel only. This
channel is preselected by bits C0:C3 in the Control Config-
uration 2 register (Address 19h). When in round robin mode
the analog input multiplexer sequentially selects the V
DD
input
channel, on-chip temperature sensor to measure its internal
temperature, the external temperature sensor, or an AIN
channel, and then the rest of the AIN channels. These signals
are digitized by the ADC and the results stored in the various
value registers.
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ADT7411ARQZ-REEL7 Circular Connector; No. of Contacts:55; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:17-35
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