參數(shù)資料
型號： ADT7460
廠商： Analog Devices, Inc.
英文描述： dB COOL?? Remote Thermal Controller and Fan Controller
中文描述： 分貝很酷吧？？遠(yuǎn)程熱控制器和風(fēng)扇控制器
文件頁數(shù)： 14/48頁
文件大?。?/td> 695K
代理商： ADT7460
REV. 0
–14–
ADT7460
ADDITIONAL ADC FUNCTIONS FOR VOLTAGE
MEASUREMENTS
A number of other functions are available on the ADT7460 to
offer the systems designer increased flexibility:
Turn Off Averaging
For each voltage measurement read from a value register, 16
readings have actually been made internally and the results
averaged before being placed into the value register. There may
be an instance where you would like to speed up conversions.
Setting Bit 4 of Configuration Register 2 (Reg. 0x73) turns aver-
aging off. This effectively gives a reading 16 times faster (711
μ
s),
but the reading may be noisier.
Bypass Voltage Input Attenuator
Setting Bit 5 of Configuration Register 2 (Reg. 0x73) removes
the attenuation circuitry from the 2.5 V
input. This allows the
user to directly connect external sensors or rescale the analog
voltage measurement inputs for other applications. The input
range of the ADC without the attenuators is 0 V to 2.25 V.
Single-Channel ADC Conversion
Setting Bit 6 of Configuration Register 2 (Reg. 0x73) places the
ADT7460 into Single-Channel ADC Conversion Mode. In this
mode, the ADT7460 can be made to read a single voltage chan-
nel only. If the internal ADT7460 clock is used, the selected
input will be read every 711
μ
s. The appropriate ADC channel
is selected by writing to Bits <7:5> of the TACH1 Minimum
High Byte Register (0x55).
Bits <7:5> Reg 0x55
000
010
Channel Selected
2.5 V
V
CC
Configuration Register 2 (Reg. 0x73)
<4> = 1
Averaging Off
<5> = 1
Bypass Input Attenuators
<6> = 1
Single-Channel Convert Mode
TACH1 Minimum High Byte (Reg. 0x55)
<7:5>
Selects ADC Channel for Single-Channel Convert
Mode
TEMPERATURE MEASUREMENT SYSTEM
Local Temperature Measurement
The ADT7460 contains an on-chip band gap temperature sensor
whose output is digitized by the on-chip 10-bit ADC. The 8-bit
MSB temperature data is stored in the Local Temp Register
(Address 26h). As both positive and negative temperatures can be
measured, the temperature data is stored in twos complement
format, as shown in Table III. Theoretically, the temperature sensor
and ADC can measure temperatures from –128 C to +127 C
with a resolution of 0.25 C. However, this exceeds the operating
temperature range of the device, so local temperature measure-
ments outside this range are not possible.
Remote Temperature Measurement
The ADT7460 can measure the temperature of two remote diode
sensors or diode-connected transistors connected to Pins 12 and
13, or 10 and 11.
The forward voltage of a diode or diode-connected transistor
operated at a constant current exhibits a negative temperature
coefficient of about –2 mV/ C. Unfortunately, the absolute
value of V
BE
varies from device to device and individual calibra-
tion is required to null this out, so the technique is unsuitable
for mass production. The technique used in the ADT7460 is to
measure the change in V
BE
when the device is operated at two
different currents.
This is given by:
V
KT q
N
BE
=
×
( )
ln
where:
K
is Boltzmann’s constant
q
is charge on the carrier
T
is absolute temperature in Kelvins
N
is ratio of the two currents.
Figure 14 shows the input signal conditioning used to measure
the output of a remote temperature sensor. This figure shows the
external sensor as a substrate transistor, provided for temperature
monitoring on some microprocessors. It could equally well be a
discrete transistor such as a 2N3904.
D+
D–
REMOTE
SENSING
TRANSISTOR
I
N I
I
BIAS
V
DD
V
OUT+
TO ADC
V
OUT–
BIAS
DIODE
LOW PASS
FILTER
f
C
= 65kHz
THERMDA
THERMDC
CPU
Figure 14. Signal Conditioning for Remote Diode Temperature Sensors
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