参数资料
| 型号： | ADT7462ZEVB |
| 厂商： | ON Semiconductor |
| 文件页数： | 22/82页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADT7462 |
| 产品变化通告： | MFG CHG Notification ADI to ON Semi |
| 标准包装： | 1 |
| 类型： | 温度传感器 |
| 适用于相关产品： | ADT7462 |
| 所含物品： | 评估板 |
| 其它名称： | EVAL-ADT7462EBZ EVAL-ADT7462EBZ-ND |
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ADT7462
Noise Filtering
For temperature sensors operating in noisy environments,
the industry-standard practice is to place a capacitor across
the D+ and D ? pins to help combat the effects of noise.
However, large capacitances affect the accuracy of the
temperature measurement, leading to a recommended
maximum capacitor value of 1000 pF. While this capacitor
does reduce noise, it does not eliminate it, making it difficult
to use the sensor in a very noisy environment.
The ADT7462 has a major advantage over other devices
in eliminating the effects of noise on the external sensor. The
series resistance cancellation feature allows a filter to be
(2.25 V). All analog inputs are multiplexed into the on-chip,
successive approximation ADC. This ADC has a resolution
of ten bits. The basic input range is from 0 V to 2.25 V, but
the inputs have built-in attenuators to allow measurement of
larger and smaller voltages. To allow a tolerance for these
voltages, the ADC produces an output of 3/4 full scale
(decimal 768 or 0x300) for the nominal input voltage and so
has enough headroom to cope with overvoltages.
A list of corresponding LSB and full-scale values for each
input voltage is shown in Table 16.
Table 15. VOLTAGE INPUTS
1 nF
constructed between the external temperature sensor and the
device. The effect of any filter resistance seen in series with
the remote sensor is automatically canceled from the
temperature result.
The construction of a filter allows the ADT7462 and the
remote temperature sensor to operate in noisy environments.
Figure 35 shows a low-pass RCR filter, with the following
values:
R = 100 W
C = 1 nF
This filtering reduces both common-mode noise and
differential noise.
100 W
D+
REMOTE
SENSOR 100 W
D ?
Pin
7
8
13
15
19
21
22
23
24
25
26
28
29
Voltage Measured
+12V1
+12V2
+3.3V
+2.5V / +1.8V
+1.25V / +0.9V
+5V
+12V3
V CCP1 / +1.5V / +1.8V / +2.5V
V CCP2 / +1.5V / +1.8V / +2.5V
+1.2V1 (G BIT ) / +3.3V
+1.2V2 (FSB_V TT ) / V BATT
+1.5V1 (ICH)
+1.5V2 (3GIO)
Figure 35. Filter Between Remote Sensor and
Table 16. INPUT RANGE CODE CONVERSION
ADT7462
Nominal Input
1 LSB
Full
Voltage Measurement
The ADT7462 is capable of measuring up to 13 different
voltage inputs at one time. Table 15 is a list of the voltage
measurement inputs and the corresponding input pins. Each
pin can be configured to measure the desired voltage option
using the Pin Configuration 1 (0x10) to Pin Configuration 4
(0x13) registers or the easy configuration options.
Input Circuit
The internal structure for the voltage inputs is shown in
Figure 36. Each input circuit consists of an input protection
diode, an attenuator, plus a capacitor to form a first-order,
low-pass filter that gives the input immunity to high
frequency noise.
Voltages with full-scale values greater than the reference
are divided so that the full-scale value equals the reference
Voltage (3/4 Scale)
+12V
+5V
V CCP1 , V CCP2
V CCP1 , when VIDs
are Enabled
+3.3V
V BATT
+2.5V
+1.8V
+1.5V
+1.25V
+1.2V
+0.9V
Pin No.
7, 8, 22
21
23, 24
23
13, 25
26
15, 23, 24
15, 23, 24
23, 24, 28, 29
19
25, 26
19
Value
0.0625
0.026
0.00625
0.0125
0.0172
0.0156
0.013
0.0094
0.0078
0.0065
0.00625
0.00469
Scale
16 V
6.67 V
1.6 V
3.2 V
4.4 V
4.0 V
3.33 V
2.4 V
2.0 V
1.667 V
1.6 V
1.2 V
http://onsemi.com
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