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| 型號(hào)： | ADT7461AARMZ-R |
| 廠商： | ON Semiconductor |
| 文件頁(yè)數(shù)： | 8/19頁(yè) |
| 文件大小： | 294K |
| 描述： | IC TEMP SENSOR DGTL 2CH 8-MSOP |
| 產(chǎn)品變化通告： | MFG CHG Notification ADI to ON Semi |
| 標(biāo)準(zhǔn)包裝： | 3,000 |
| 功能： | 溫度監(jiān)控系統(tǒng)（傳感器） |
| 傳感器類(lèi)型： | 內(nèi)部和外部 |
| 感應(yīng)溫度： | 0°C ~ 127°C，-55°C ~ 150°C |
| 精確度： | ±3°C |
| 拓?fù)洌?/td> | ADC，比較器，多路復(fù)用器，寄存器庫(kù) |
| 輸出類(lèi)型： | 2 線 SMBus? |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 120°C |
| 安裝類(lèi)型： | 表面貼裝 |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | Micro8? |
| 包裝： | 帶卷 (TR) |
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ADT7461A
http://onsemi.com
8
The resulting DV
BE
waveforms are passed through a
65 kHz low-pass filter to remove noise and then to a
chopper-stabilized amplifier. This amplifies and rectifies the
waveform to produce a dc voltage proportional to DV
BE
.
The ADC digitizes this voltage producing a temperature
measurement. To reduce the effects of noise, digital filtering
is performed by averaging the results of 16 measurement
cycles for low conversion rates. At rates of 16-, 32-, and
64-conversions/second, no digital averaging occurs.
Signal conditioning and measurement of the internal
temperature sensor are performed in the same manner.
Figure 14. Input Signal Conditioning
LOW-PASS FILTER
f
C
= 65 kHz
REMOTE
SENSING
TRANSISTOR
BIAS
DIODE
D+
D
V
DD
I
BIAS
I
N1 ?I
V
OUT+
V
OUT
To ADC
N2 ?I
C1*
*CAPACITOR C1 IS OPTIONAL. IT IS ONLY NECESSARY IN NOISY ENVIRONMENTS. C1 = 1000 pF MAX.
Temperature Measurement Results
The results of the local and remote temperature
measurements are stored in the local and remote temperature
value registers and compared with limits programmed into
the local and remote high and low limit registers.
The local temperature value is in Register 0x00 and has a
resolution of 1癈. The external temperature value is stored
in two registers, with the upper byte in Register 0x01 and the
lower byte in Register 0x10. Only the two MSBs in the
external temperature low byte are used giving the external
temperature measurement a resolution of 0.25癈. Table 7
lists the data format for the external temperature low byte.
Table 7. EXTENDED TEMPERATURE RESOLUTION
(REMOTE TEMPERATURE LOW BYTE)
Extended Resolution
Remote Temperature
Low Byte
0.00癈
0 000 0000
0.25癈
0 100 0000
0.50癈
1 000 0000
0.75癈
1 100 0000
When reading the full external temperature value, read the
LSB first. This causes the MSB to be locked (that is, the
ADC does not write to it) until it is read. This feature ensures
that the results read back from the two registers come from
the same measurement.
Temperature Measurement Range
The temperature measurement range for both internal and
external measurements is, by default, 0癈 to +127癈.
However, the ADT7461A can be operated using an
extended temperature range. The extended measurement
range is 64癈 to +191癈. Therefore, the ADT7461A can be
used to measure the full temperature range of an external
diode, from 55癈 to +150癈.
The extended temperature range is selected by setting
Bit 2 of the configuration register to 1. The temperature
range is 0癈 to 127癈 when Bit 2 equals 0. A valid result is
available in the next measurement cycle after changing the
temperature range.
In extended temperature mode, the upper and lower
temperature that can be measured by the ADT7461A is
limited by the remote diode selection. The temperature
registers can have values from 64癈 to +191癈. However,
most temperature sensing diodes have a maximum
temperature range of 55癈 to +150癈. Above +150癈, they
may lose their semiconductor characteristics and
approximate conductors instead. This results in a diode
short. In this case, a read of the temperature result register
gives the last good temperature measurement. Therefore,
the temperature measurement on the external channel may
not be accurate for temperatures that are outside the
operating range of the remote sensor.
It should be noted that although both local and remote
temperature measurements can be made while the part is in
extended temperature mode, the ADT7461A itself should
not be exposed to temperatures greater than those specified
in the absolute maximum ratings section. Further, the device
is only guaranteed to operate as specified at ambient
temperatures from 40癈 to +120癈.
Temperature Data Format
The ADT7461A has two temperature data formats. When
the temperature measurement range is from 0癈 to 127癈
(default), the temperature data format for both internal and
external temperature results is binary. When the measurement
range is in extended mode, an offset binary data format is used
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| ADT7461AARMZ-REEL | 功能描述:IC SENSOR TEMP DGTL 2CH 8-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類(lèi)型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類(lèi)型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱(chēng):296-22675-6 |
| ADT7461AARMZ-REEL7 | 功能描述:IC SENSOR TEMP DGTL 2CH 8-MSOP RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類(lèi)型:內(nèi)部和外部 感應(yīng)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(yuǎn)程（最大值） 拓?fù)?ADC，比較器，寄存器庫(kù) 輸出類(lèi)型:2 線 SMBus? 輸出警報(bào):無(wú) 輸出風(fēng)扇:無(wú) 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-8 供應(yīng)商設(shè)備封裝:SOT-23-8 包裝:Digi-Reel® 其它名稱(chēng):296-22675-6 |
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