參數(shù)資料
型號: ADT7460ARQ
廠商: ANALOG DEVICES INC
元件分類: 模擬信號調(diào)理
英文描述: dB COOL?? Remote Thermal Controller and Fan Controller
中文描述: SPECIALTY ANALOG CIRCUIT, PDSO16
封裝: 0.025 INCH PITCH, MO-137AB, QSOP-16
文件頁數(shù): 12/48頁
文件大?。?/td> 695K
代理商: ADT7460ARQ
REV. 0
–12–
ADT7460
VOLTAGE MEASUREMENT INPUT
The ADT7460 has one external voltage measurement channel.
It can also measure its own supply voltage, V
CC
.
Pin 14 may be configured to measure a 2.5 V supply. The V
CC
supply voltage measurement is carried out through the V
CC
pin
(Pin 3). Setting Bit 7 of Configuration Register 1 (Reg. 0x40)
allows a 5 V supply to power the ADT7460 and be measured
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
input has built-in attenuators to allow measurement of 2.5 V
without any external components. To allow for the tolerance of
the supply voltage, 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 deal with overvoltages.
INPUT CIRCUITRY
The internal structure for the 2.5 V analog input is shown in
Figure 13. The 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.
VOLTAGE MEASUREMENT REGISTERS
Reg. 0x20
2.5 V Reading
= 0x00 default
2.5 V LIMIT REGISTERS
Associated with the 2.5 V measurement channel is a high and
low limit register. 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
30pF
45k
94k
2.5V
IN
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 takes nominally 11.38 ms.
相關(guān)PDF資料
PDF描述
ADT7461 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR-REEL 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461AR-REEL7 【1∑C Temperature Monitor with Series Resistance Cancellation
ADT7461ARM 【1∑C Temperature Monitor with Series Resistance Cancellation
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