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參數資料
| 型號： | MAX6695YAUB+ |
| 廠商： | Maxim Integrated |
| 文件頁數： | 8/19頁 |
| 文件大?。?/td> | 293K |
| 描述： | IC SENSOR TEMP SMBUS 10-UMAX |
| 產品變化通告： | Product Discontinuation 13/Jun/2011 |
| 標準包裝： | 50 |
| 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 |
| 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： | 是 |
| 電源電壓： | 3 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 10-uMAX |
| 包裝： | 管件 |
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,
its collector and base must be connected together.
Table 1 lists examples of discrete transistors that are
appropriate for use with the MAX6695/MAX6696.
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糀, and at the lowest expected tempera-
ture, the forward voltage must be less than 0.95V at
100糀. 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
range. We have observed variations in remote tempera-
ture readings of less than ?癈 with a variety of dis-
crete transistors. Still, it is good design practice to
verify good consistency of temperature readings with
several discrete transistors from any manufacturer
under consideration.
Thermal Mass and Self-Heating
When sensing local temperature, these temperature
sensors are intended to measure the temperature of the
PC board to which they are soldered. The leads pro-
vide a good thermal path between the PC board traces
and the die. As with all IC temperature sensors, thermal
conductivity between the die and the ambient air is
poor by comparison, making air temperature measure-
ments impractical. Because the thermal mass of the PC
board is far greater than that of the MAX6695/
MAX6696, the device follows temperature changes on
the PC board with little or no perceivable delay.
When measuring the temperature of a CPU or other IC
with an on-chip sense junction, thermal mass has virtu-
ally no effect; the measured temperature of the junction
tracks the actual temperature within a conversion cycle.
When measuring temperature with discrete remote
transistors, the best thermal response times are
obtained with transistors in small packages (i.e., SOT23
or SC70). Take care to account for thermal gradients
between the heat source and the sensor, and ensure
that stray air currents across the sensor package do
not interfere with measurement accuracy.
Self-heating does not significantly affect measurement
accuracy. Remote-sensor self-heating due to the diode
current source is negligible. For local temperature mea-
surements, the worst-case error occurs when autocon-
verting at the fastest rate and simultaneously sinking
maximum current at the ALERT output. For example,
with V
CC
= 3.6V, a 4Hz conversion rate and ALERT
sinking 1mA, the typical power dissipation is:
?/DIV>
J-A
for the 16-pin QSOP package is about +120癈/W,
so assuming no copper PC board heat sinking, the
resulting temperature rise is:
Even under these worst-case circumstances, it is diffi-
cult to introduce significant self-heating errors.
ADC Noise Filtering
The integrating ADC has good noise rejection for low-
frequency signals such as power-supply hum. In envi-
ronments with significant high-frequency EMI, connect
an external 2200pF capacitor between DXP_ and DXN.
Larger capacitor values can be used for added filter-
ing, but do not exceed 3300pF because it can intro-
duce errors due to the rise time of the switched current
source. High-frequency noise reduction is needed for
high-accuracy remote measurements. Noise can be
reduced with careful PC board layout as discussed in
the PC Board Layout section.
Low-Power Standby Mode
Standby mode reduces the supply current to less than
10糀 by disabling the ADC. Enter hardware standby
(MAX6696 only) by forcing STBY low, or enter software
standby by setting the RUN/STOP bit to 1 in the config-
擳
mW
C W
C
=
?/DIV>
?/DIV>
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= +
?/DIV>
2 2
120
0 264
.
/
.
V
A
V mA
mW
CC
?/DIV>
+
?/DIV>
=
500
0 4 1
2 2
?/DIV>
.
.
Dual Remote/Local Temperature Sensors with
SMBus Serial Interface
8 _______________________________________________________________________________________
MANUFACTURER
MODEL NO.
Central Semiconductor (USA) CMPT3904
Rohm Semiconductor (USA)
SST3904
Samsung (Korea)
KST3904-TF
Siemens (Germany)
SMBT3904
Zetex (England)
FMMT3904CT-ND
Table 1. Remote-Sensor Transistor
Manufacturers
Note: Discrete transistors must be diode connected (base
shorted to collector).
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX6695YAUB+ | 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 |
| MAX6695YAUB+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 |
| MAX6696AEE | 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 |
| MAX6696AEE+ | 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 |
| MAX6696AEE+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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