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參數(shù)資料
型號(hào): ADT7463
廠商: Analog Devices, Inc.
英文描述: dB COOL Remote Thermal Controller and Voltage Monitor
中文描述: 分貝超酷的遠(yuǎn)程熱控制器和電壓監(jiān)視器
文件頁數(shù): 12/53頁
文件大小: 719K
代理商: ADT7463
REV. 0
–12–
ADT7463
VOLTAGE MEASUREMENT INPUTS
The ADT7463 has four external voltage measurement channels.
It can also measure its own supply voltage, V
CC
.
Pins 20 to 23 are dedicated to measuring 5 V, 12 V, and 2.5 V
supplies and the processor core voltage V
CCP
(0 V to 3 V input).
The V
CC
supply voltage measurement is carried out through the
V
CC
pin (Pin 4). Setting Bit 7 of Configuration Register 1 (Reg.
0x40) allows a 5 V supply to power the ADT7463 and be mea-
sured without overranging the V
CC
measurement channel. The
2.5 V input can be used to monitor a chipset supply voltage in
computer systems.
ANALOG-TO-DIGITAL CONVERTER
All analog inputs are multiplexed into the on-chip, successive-
approximation, analog-to-digital converter. This has a resolu-
tion 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 an output of 3/4 full scale
(decimal 768 or 300 hex) for the nominal input voltage, and so
has adequate headroom to cope with overvoltages.
INPUT CIRCUITRY
The internal structure for the analog inputs is shown in Figure 13.
Each input circuit consists of an input protection diode, an attenu-
ator, plus a capacitor to form a first-order low-pass filter that gives
the input immunity to high frequency noise.
VOLTAGE MEASUREMENT REGISTERS
Reg. 0x20
2.5 V Reading
= 0x00 default
Reg. 0x21
V
CCP
Reading
= 0x00 default
Reg. 0x22
V
CC
Reading
= 0x00 default
Reg. 0x23
5 V Reading
= 0x00 default
Reg. 0x24
12 V Reading
= 0x00 default
VOLTAGE MEASUREMENT LIMIT REGISTERS
Associated with each voltage measurement channel are high and
low limit registers. Exceeding the programmed high or low limit
causes the appropriate Status bit to be set. Exceeding either
limit can also generate
SMBALERT
interrupts.
Reg. 0x44
2.5 V Low Limit
= 0x00 default
Reg. 0x45
2.5 V High Limit
= 0xFF default
Reg. 0x46
V
CCP
Low Limit
= 0x00 default
Reg. 0x47
V
CCP
High Limit
= 0xFF default
Reg. 0x48
V
CC
Low Limit
= 0x00 default
Reg. 0x49
V
CC
High Limit
= 0xFF default
Reg. 0x4A
5 V Low Limit
= 0x00 default
Reg. 0x4B
5 V High Limit
= 0xFF default
Reg. 0x4C
12 V Low Limit
= 0x00 default
Reg. 0x4D
12 V High Limit
= 0xFF default
30pF
120k
30pF
93k
MUX
30pF
68k
30pF
45k
52.5k
35pF
17.5k
94k
71k
47k
20k
12V
IN
5V
IN
3.3V
IN
2.5V
IN
V
CCPIN
Figure 13. Structure of Analog Inputs
Table II shows the input ranges of the analog inputs and output
codes of the 10-bit ADC.
When the ADC is running, it samples and converts a voltage
input in 711
μ
s and averages 16 conversions to reduce noise; a
measurement on each input takes nominally 11.38 ms.
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