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參數資料
| 型號： | MAX6642ATT94+T |
| 廠商： | Maxim Integrated |
| 文件頁數： | 10/14頁 |
| 文件大小： | 154K |
| 描述： | IC TEMP SENSOR SMBUS 6TDFN |
| 產品培訓模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標準包裝： | 2,500 |
| 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，0°C ~ 150°C |
| 精確度： | ±3°C（最小值） |
| 拓撲： | ADC，多路復用器，寄存器庫 |
| 輸出類型： | I²C?/SMBus? |
| 輸出警報： | 是 |
| 輸出風扇： | 無 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 6-WDFN 裸露焊盤 |
| 供應商設備封裝： | 6-TDFN 裸露焊盤（3x3） |
| 包裝： | 帶卷 (TR) |
III. A thermal diode on the substrate of an IC is normally
a PNP with its collector grounded. Connect the anode
(emitter) to DXP and the cathode to GND of the
MAX6642.
If a sense transistor with an ideality factor other than
1.008 is used, the output data is different from the data
obtained with the optimum ideality factor. Fortunately,
the difference is predictable.
Assume a remote-diode sensor designed for a nominal
ideality factor n
NOMINAL
is used to measure the tem-
perature of a diode with a different ideality factor n
1
.
The measured temperature T
M
can be corrected using:
where temperature is measured in Kelvin and
n
NOMIMAL
for the MAX6642 is 1.008.
As an example, assume you want to use the MAX6642
with a CPU that has an ideality factor of 1.002. If the
diode has no series resistance, the measured data is
related to the real temperature as follows:
For a real temperature of +85癈 (358.15K), the mea-
sured temperature is +82.91癈 (356.02K), an error of
-2.13癈.
Effect of Series Resistance
Series resistance in a sense diode contributes addition-
al errors. For nominal diode currents of 10礎 and
100礎, the change in the measured voltage due to
series resistance is:
擵
M
= R
S
(100礎 - 10礎) = 90礎 R
S
Since +1癈 corresponds to 198.6礦, series resistance
contributes a temperature offset of:
Assume that the diode being measured has a series
resistance of 3? The series resistance contributes an
offset of:
The effects of the ideality factor and series resistance
are additive. If the diode has an ideality factor of 1.002
and series resistance of 3? the total offset can be cal-
culated by adding error due to series resistance with
error due to ideality factor:
1.36癈 - 2.13癈 = -0.77癈
for a diode temperature of +85癈.
In this example, the effect of the series resistance and
the ideality factor partially cancel each other.
Discrete Remote Diodes
When the remote-sensing diode is a discrete transistor,
connect its collector and base together. Table 7 lists
examples of discrete transistors that are appropriate for
use with the MAX6642.
The transistor must be a small-signal type with a rela-
tively high forward voltage; otherwise, the A/D input
voltage range can be violated. The forward voltage at
the highest expected temperature must be greater than
0.25V at 10礎, and at the lowest expected tempera-
ture, the forward voltage must be less than 0.95V at
100礎. Large power transistors must not be used. Also,
ensure that the base resistance is less than 100? Tight
specifications for forward current gain (50 < ?<150, for
example) indicate that the manufacturer has good
process controls and that the devices have consistent
V
BE
characteristics.
Manufacturers of discrete transistors do not normally
specify or guarantee ideality factor. This is normally not
a problem since good-quality discrete transistors tend
to have ideality factors that fall within a relatively narrow
3 0 453
1 36
??/DIV>
?/DIV>
?/DIV>
= +
?/DIV>
.
.
C
C
90
198 6
0 453
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
V
V
C
C
.
.
T
T
n
n
T
T
ACTUAL
M
NOMINAL
M
M
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
?/DIV>
=
1
1 008
1 002
1 00599
.
.
( .
)
T T
n
n
M ACTUAL
NOMINAL
=
?/DIV>
?/DIV>
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?/DIV>
?/DIV>
?/DIV>
?/DIV>
1
?癈, SMBus-Compatible Remote/Local
Temperature Sensor with Overtemperature Alarm
10 ______________________________________________________________________________________
MANUFACTURER
MODEL NO.
Central Semiconductor (USA)
CMPT3906
Rohm Semiconductor (USA)
SST3906
Samsung (Korea)
KST3906-TF
Siemens (Germany)
SMBT3906
Zetex (England)
FMMT3906CT-ND
Table 7. Remote-Sensor Transistor
Manufacturers
Note: Discrete transistors must be diode connected (base short-
ed to collector).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX6642ATT96+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6642ATT96-T | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
| MAX6642ATT98 | 制造商:Maxim Integrated Products 功能描述:1 C SMBUS-COMPATIBLE REMOTE/LOCAL TEMPERATURE SENSOR WITH O - Rail/Tube |
| MAX6642ATT98+ | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 6TDFN EP - Rail/Tube |
| MAX6642ATT98+T | 功能描述:板上安裝溫度傳感器 SMBus-Compatible Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關閉: 安裝風格: 封裝 / 箱體: 設備功能:Temperature and Humidity Sensor |
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