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參數(shù)資料
型號: 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): 15/53頁
文件大小: 719K
代理商: ADT7463
REV. 0
ADT7463
–15–
TEMPERATURE MEASUREMENT SYSTEM
Local Temperature Measurement
The ADT7463 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 ADT7463 can measure the temperature of two remote diode
sensors or diode-connected transistors connected to Pins 15 and
16, or 17 and 18.
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
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
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 ADT7463 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.
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