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參數資料
| 型號： | ADT7463 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | dB COOL Remote Thermal Controller and Voltage Monitor |
| 中文描述： | 分貝超酷的遠程熱控制器和電壓監視器 |
| 文件頁數： | 16/53頁 |
| 文件大小： | 719K |
| 代理商： | ADT7463 |
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REV. 0
–16–
ADT7463
If a discrete transistor is used, the collector will not be grounded,
and should be linked to the base. If a PNP transistor is used, the
base is connected to the D– input and the emitter to the D+
input. If an NPN transistor is used, the emitter is connected to
the D– input and the base to the D+ input. Figure 15 shows
how to connect the ADT7463 to an NPN or PNP transistor for
temperature measurement. To prevent ground noise from inter-
fering with the measurement, the more negative terminal of the
sensor is not referenced to ground but is biased above ground
by an internal diode at the D– input.
To measure
V
BE
, the sensor is switched between operating currents
of I and N I. The resulting waveform is passed through a
65 kHz low-pass filter to remove noise, and to a chopper-stabilized
amplifier that performs the functions of amplification and recti-
fication of the waveform to produce a dc voltage proportional to
V
BE
. This voltage is measured by the ADC to give a tempera-
ture output in 10-bit, twos complement format. To further reduce
the effects of noise, digital filtering is performed by averaging
the results of 16 measurement cycles. A remote temperature
measurement takes nominally 25.5 ms. The results of remote
temperature measurements are stored in 10-bit, twos complement
format, as illustrated in Table III. The extra resolution for the
temperature measurements is held in the Extended Resolution
Register 2 (Reg. 0x77). This gives temperature readings with a
resolution of 0.25 C.
Table III. Temperature Data Format
Temperature
Digital Output (10-Bit)
*
–128 C
–125 C
–100 C
–75 C
–50 C
–25 C
–10 C
0 C
+10.25 C
+25.5 C
+50.75 C
+75 C
+100 C
+125 C
+127 C
1000 0000
00
1000 0011
00
1001 1100
00
1011 0101
00
1100 1110
00
1110 0111
00
1111 0110
00
0000 0000
00
0000 1010
01
0001 1001
10
0011 0010
11
0100 1011
00
0110 0100
00
0111 1101
00
0111 1111
00
*
Bold denotes 2 LSBs of measurement in Extended
Resolution Register 2 (Reg. 0x77) with 0.25 C resolution.
ADT7463
2N3904
NPN
D+
D–
Figure 15a. Measuring Temperature Using an
NPN Transistor
2N3906
PNP
ADT7463
D+
D–
Figure 15b. Measuring Temperature Using a PNP
Transistor
Nulling Out Temperature Errors
As CPUs run faster, it is getting more difficult to avoid high
frequency clocks when routing the D+, D– traces around a sys-
tem board. Even when recommended layout guidelines are
followed, there may still be temperature errors attributed to
noise being coupled onto the D+/D– lines. High frequency noise
generally has the effect of giving temperature measurements that
are too high by a constant amount. The ADT7463 has tempera-
ture offset registers at addresses 0x70, 0x72 for the remote 1 and
Remote 2 temperature channels. By doing a one-time calibration
of the system, one can determine the offset caused by system
board noise and null it out using the offset registers. The offset
registers automatically add a twos complement 8-bit reading to
every temperature measurement. The LSB adds 0.25
°
C offset to
the temperature reading so the 8-bit register effectively allows
temperature offsets of up to 32 C with a resolution of 0.25 C.
This ensures that the readings in the temperature measurement
registers are as accurate as possible.
Temperature Offset Registers
Reg. 0x70 Remote 1 Temp Offset = 0x00 (0
°
C default)
Reg. 0x71 Local Temp Offset = 0x00 (0
°
C default)
Reg. 0x72 Remote 2 Temp Offset = 0x00 (0
°
C default)
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| ADT7463ARQ | 功能描述:IC REMOTE THERMAL CTRLR 24-QSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:dBCool® 標準包裝:1 系列:- 功能:溫度監控系統（傳感器） 傳感器類型:內部和外部 感應溫度:-40°C ~ 125°C，外部傳感器 精確度:±2.5°C 本地（最大值），±5°C 遠程（最大值） 拓撲:ADC，比較器，寄存器庫 輸出類型:2 線 SMBus? 輸出警報:無 輸出風扇:無 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-8 供應商設備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱:296-22675-6 |
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