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| 型號： | MAX6581TG98+ |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號調(diào)理 |
| 英文描述： | SPECIALTY ANALOG CIRCUIT, QCC24 |
| 封裝： | 4 X 4 MM, ROHS COMPLIANT, TQFN-24 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 881K |
| 代理商： | MAX6581TG98+ |
±1°C Accurate 8-Channel Temperature Sensor
MAX6581
______________________________________________________________________________________ 21
Unused Diode Channels
If one or more of the remote-diode channels is not
needed, disconnect the DXP_ and DXN_ inputs for
that channel, or connect the DXP_ to the correspond-
ing DXN_. The status register indicates a diode “fault”
for this channel and the channel is ignored during the
temperature-measurement sequence. It is also good
practice to mask any unused channels immediately upon
power-up by setting the appropriate bits in the ALERT
Mask and OVERT Mask registers. This prevents unused
channels from causing ALERT or OVERT to assert.
Thermal Mass and Self-Heating
When sensing local temperature, the MAX6581 mea-
sures the temperature of the PCB to which it is soldered.
The leads provide a good thermal path between the PCB
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 mea-
surements impractical. Since the thermal mass of the
PCB is far greater than that of the MAX6581, the device
follows temperature changes on the PCB 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 virtually 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.
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 100pF capacitor between DXP_ and DXN_.
Larger capacitor values can be used for added filter-
ing; however, it can introduce errors due to the rise time
of the switched current source. High-frequency noise
reduction is needed for high-accuracy remote measure-
ments. Noise can be reduced with careful PCB layout as
discussed in the PCB Layout section.
Slave Address
The slave address for the MAX6581 is shown in Table 14.
Table 13. Remote Sensors Transistor Suppliers (for Channels 1–7)
Note: Discrete transistors must be diode connected (base shorted to collector).
Table 14. Slave Address
DEVICE ADDRESS
A7
A6
A5
A4
A3
A2
A1
A0
1
0
1
0
1
R/W
SUPPLIER
MODEL NO.
PNP
NPN
Central Semiconductor Corp. (USA)
CMPT3906
2N3906
CMPT3904
2N3904
Fairchild Semiconductor (USA)
MMBT3906
2N3906
2N3904
Infineon (Germany)
SMBT3906
—
ON Semiconductor (USA)
MMBT3906
2N3906
2N3904
ROHM Semiconductor (USA)
SST3906
SST3904
Samsung (Korea)
KST3906-TF
KST3904-TF
Siemens (Germany)
SMBT3906
SMBT3904
Zetex (England)
FMMT3906CT-ND
FMMT3904CT-ND
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX6581TG98+ | 功能描述:板上安裝溫度傳感器 1C Accurate 8Ch 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6581TG98+T | 功能描述:板上安裝溫度傳感器 1C Accurate 8Ch 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6581TG9A+ | 功能描述:板上安裝溫度傳感器 1C Accurate 8Ch 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6581TG9A+T | 功能描述:板上安裝溫度傳感器 1C Accurate 8Ch 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6581TG9C+ | 功能描述:板上安裝溫度傳感器 1C Accurate 8Ch 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(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: 安裝風格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
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