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參數(shù)資料
| 型號： | MAX6692YMSA+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 12/16頁 |
| 文件大小： | 194K |
| 描述： | IC SENSOR REMOTE SMBUS 8SOIC |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 100 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | 0°C ~ 125°C，外部傳感器 |
| 精確度： | ±3°C（最小值） |
| 拓?fù)洌?/td> | ADC，多路復(fù)用器，寄存器庫 |
| 輸出類型： | I²C?/SMBus? |
| 輸出警報： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -55°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 8-SOIC（窄型） |
| 包裝： | 管件 |
Precision SMBus-Compatible Remote/Local
Temperature Sensors with Overtemperature Alarms
12 _______________________________________________________________________ ________________________________________________ __________________________________ ___________________
(actually a transistor). The MAX6648/MAX6692 (not the
MAX6648Y/MAX6692Y) are optimized for n = 1.008,
which is the typical value for the Intel
?/DIV>
Pentium
?/DIV>
III and
the AMD Athlon MP model 6. If a sense transistor with a
different ideality factor is used, the output data is differ-
ent. 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.
As mentioned above, the nominal ideality factor of the
MAX6648/MAX6692 is 1.008. As an example, assume
you want to use the MAX6648/MAX6692 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 (358.15 K), the mea-
sured temperature is +82.91癈 (356.02 K), which is 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(chǔ) and
100礎(chǔ), change in the measured voltage is:
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.
For best accuracy, the discrete transistor should be a
small-signal device with its collector and base connect-
ed together. Table 9 lists examples of discrete transis-
tors that are appropriate for use with the MAX6648/
MAX6692.
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(chǔ), and at the lowest expected tempera-
ture, the forward voltage must be less than 0.95V at
100礎(chǔ). Large power transistors must not be used.
Also, ensure that the base resistance is less than 100?
Tight specifications for forward current gain (50 < ?/DIV>
<150, for example) indicate that the manufacturer has
good process controls and that the devices have con-
sistent V
BE
characteristics.
Operation with 45nm Substrate PNPs
Small transistor geometries and specialized processes
can affect temperature measurement accuracy.
Parasitic series resistance can be higher, which
increases the measured temperature value. Beta may
3
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擵 R
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A
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100
10
90
T
n
n
T
T
ACTUAL
M
NOMINAL
M
M
=
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1
1 008
1 002
1 00599
T T
n
n
M
ACTUAL
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=
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1
Intel and Pentium are registered trademarks of Intel Corp.
MANUFACTURER
MODEL NO.
Central Semiconductor (USA)
CMPT3904
Rohm Semiconductor (USA)
SST3904
Samsung (Korea)
KST3904-TF
Siemens (Germany)
SMBT3904
Table 9. Remote-Sensor Transistor
Manufacturers
Note: Transistors must be diode connected (base shorted to
collector).
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| MAX6697UP38+ | IC TEMP MON 7CH PREC 20TSSOP |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6692YMSA+ | 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6692YMSA+T | 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6692YMUA+ | 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6692YMUA+T | 功能描述:板上安裝溫度傳感器 Remote/Local Temperature Sensor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6693UP9A+ | 功能描述:板上安裝溫度傳感器 7Ch Precision Temperature Monitor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)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(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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