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參數(shù)資料
| 型號： | ADT7485ARMZ-REEL |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 16BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
| 封裝： | LEAD FREE, PLASTIC, MO-187-BA, MSOP-10 |
| 文件頁數(shù)： | 4/16頁 |
| 文件大?。?/td> | 235K |
| 代理商： | ADT7485ARMZ-REEL |
ADT7485
Preliminary Technical Data
Rev. PrA | Page 12 of 16
VOLTAGE MEASUREMENT
The ADT7485 has four external voltage measurement channels.
It can also measure its own supply voltage, VCC. Pins 5 to 8 can
measure the supplies of the 12V, 5V, processor core voltage
(V
CCP
), and 2.5 V pins, respectively. The VCC supply voltage
measurement is carried out through the V
CC pin (Pin 1). The
2.5V pin can be used to monitor a chipset supply voltage in a
computer system.
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive-
approximation, analog-to-digital converter (ADC). This has a
resolution of 10 bits. The basic input range is 0 V to 2.25 V, but
the inputs have built-in attenuators to allow measurement of 2.5
V, 3.3 V, 5 V, 12 V, and the processor core voltage (V
CCP
) without
any external components.
To allow for the tolerance of these supply voltages, the ADC
produces a specific output for each nominal input voltage and
therefore has adequate headroom to cope with overvoltages.
The maximum input voltage that can be recorded for each
channel is shown in Table 10.
Table 10 Maximum Reported Input Voltages
Voltage Channel
Maximum Input
12V
16 V
5V
8 V
VCC
4 V
2.5V
4 V
VCCP
4 V
Input Circuitry
The internal structure for the analog inputs is shown in
Figure 14. The input circuit consists of an input protection
diode and an attenuator, plus a capacitor that forms a first-
order, low-pass filter to provide input immunity to high
frequency noise.
VCCP
17.5k
52.5k
35pF
2.5VIN
45k
94k
30pF
3.3VIN
68k
71k
30pF
5VIN
93k
47k
30pF
12VIN
120k
20k
30pF
MUX
05
19
7-
0
3
Figure 14. Internal Structure of Analog Inputs
Voltage Measurement Command Codes
The voltage measurement command codes are detailed in Table 11.
Each voltage measurement has a read length of two bytes in
little endian format (LSB followed by MSB). All voltages can be
read together by addressing Command Code 0x10 with a read
length of 0x10. The data is retrieved in the order listed in Table 11.
Table 11. Voltage Measurement Command Codes
Voltage Channel
Command Code
Returned Data
12V
0x10
LSB, MSB
5V
0x11
LSB, MSB
VCC
0x12
LSB, MSB
2.5V
0x13
LSB, MSB
VCCP
0x14
LSB, MSB
Voltage Data Format
The returned voltage value is in twos compliment, 16-bit,
binary format. The format is structured so that voltages in the
range of ±32 V can be reported. In this way, the reported value
represents the number of 1/1024 V in the actual reading,
allowing a resolution of approximately 1 mV.
Table 12 Analog-to-Digital Output Code vs. VIN
Twos Complement
Voltage
MSB
LSB
12
0011 0000
0000 0000
5
0001 0100
0000 0000
3.3
0000 1101
0011 0011
3
0000 1100
0000 0000
2.5
0000 1010
0000 0000
1
0000 0100
0000 0000
0
0000 0000
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