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參數(shù)資料
| 型號(hào)： | ADT7462ACPZ-500RL7 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類(lèi)： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 4Cel, SQUARE, SURFACE MOUNT |
| 封裝： | 5 X 5 MM, LFCSP-32 |
| 文件頁(yè)數(shù)： | 18/88頁(yè) |
| 文件大?。?/td> | 836K |
| 代理商： | ADT7462ACPZ-500RL7 |
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ADT7462
Rev. 2 | Page 25 of 88 | www.onsemi.com
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.
Table 15. Voltage Inputs
Pin
Voltage Measured
7
+12V1
8
+12V2
13
+3.3V
15
+2.5V/+1.8V
19
+1.25V/+0.9V
21
+5V
22
+12V3
23
VCCP1/+1.5V/+1.8V/+2.5V
24
VCCP2/+1.5V/+1.8V/+2.5V
25
+1.2V1 (GBIT)/+3.3V
26
+1.2V2 (FSB_VTT)/VBATT
28
+1.5V1 (ICH)
29
+1.5V2 (3GIO)
Input Circuit
The internal structure for the voltage inputs is shown in Figure 37.
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 (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 full scale (decimal 768 or 0x300) for
the nominal input voltage and so has enough headroom to cope
with overvoltages.
0.9V
8k
92k
35pF
1.25V
30k
72k
10pF
32k
77k
10pF
51k
66k
8pF
1.8V
8k
91k
35pF
2.5V
30k
72k
10pF
3.3V
68k
71k
5pF
5V
76k
39k
5pF
12V
100k
16k
5pF
MUX
GBIT,
FSB_VTT,
VCCP1,
VCCP2
ICH,
3GIO,
1.5V
0556
9-
027
Figure 37. Voltage Input Structures
A list of corresponding LSB and full-scale values for each input
voltage is shown in Table 16.
Table 16. Input Range Code Conversion
Nominal Input
Voltage ( Scale)
Pin No.
1 LSB
Value
Full
Scale
+12V
7, 8, 22
0.0625
16 V
+5V
21
0.026
6.67 V
VCCP1, VCCP2
23, 24
0.00625
1.6 V
VCCP1, when VIDs are enabled
23
0.0125
3.2 V
+3.3V
13, 25
0.0172
4.4 V
VBATT
26
0.0156
4 V
+2.5V
15, 23, 24
0.013
3.33 V
+1.8V
15, 23, 24
0.0094
2.4 V
+1.5V
23, 24, 28, 29
0.0078
2 V
+1.25V
19
0.0065
1.667 V
+1.2V
25, 26
0.00625
1.6 V
+0.9V
19
0.00469
1.2 V
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