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參數(shù)資料
| 型號(hào)： | ADT7411ARQ-REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | Circular Connector; No. of Contacts:55; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:17-35 |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 5Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | MO-137-AB, QSOP-16 |
| 文件頁數(shù)： | 13/36頁 |
| 文件大?。?/td> | 456K |
| 代理商： | ADT7411ARQ-REEL7 |
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ADT7411
THEORY OF OPERATION
Directly after the power-up calibration routine, the ADT7411
goes into idle mode. In this mode, the device is not performing
any measurements and is fully powered up.
Rev. A | Page 13 of 36
To begin monitoring, write to the Control Configuration 1
register (Address 18h) and set Bit C0 = 1. The ADT7411 goes
into its power-up default measurement mode, which is round
robin. The device proceeds to take measurements on the V
DD
channel, internal temperature sensor channel, external temp-
erature sensor channel, or AIN1 and AIN2, AIN3, AIN4, AIN5,
AIN6, AIN7, and finally AIN8. Once it finishes taking measure-
ments on the AIN8 channel, the device immediately loops back
to start taking measurements on the V
DD
channel and repeats
the same cycle as before. This loop continues until the mon-
itoring is stopped by resetting Bit C0 of the Control Config-
uration 1 register to 0. It is also possible to continue monitoring
as well as switching to single-channel mode by writing to the
Control Configuration 2 register (Address 19h) and setting
Bit C4 = 1. Further explanations of the single-channel and
round robin measurement modes are given in later sections. All
measurement channels have averaging enabled on them at
power-up. Averaging forces the device to take an average of 16
readings before giving a final measured result. To disable aver-
aging and consequently decrease the conversion time by a factor
of 16, set C5 = 1 in the Control Configuration 2 register.
There are eight single-ended analog input channels on the
ADT7411: AIN1 to AIN8. AIN1 and AIN2 are multiplexed with
the external temperature sensors D+ and D terminals. Bits C1
and C2 of the Control Configuration 1 register (Address 18h)
are used to select between AIN1/2 and the external temperature
sensor. The input range on the analog input channels is
dependent on whether the ADC reference used is the internal
V
REF
or V
DD
. To meet linearity specifications, it is recommended
that the maximum V
DD
value is 5 V. Bit C4 of the Control
Configuration 3 register is used to select between the internal
reference and V
DD
as the analog inputs’ ADC reference.
The dual serial interface defaults to the I
2
C protocol on power-
up. To select and lock in the SPI protocol, follow the selection
process as described in the Serial Interface Selection section.
The I
2
C protocol cannot be locked in, while the SPI protocol on
selection is automatically locked in. The interface can only be
switched back to I
2
C when the device is powered off and on.
When using I
2
C, the CS pin should be tied to either V
DD
or
GND.
There are a number of different operating modes on the
ADT7411 devices and all of them can be controlled by the
configuration registers. These features consist of enabling and
disabling interrupts, polarity of the INT/INT pin, enabling and
disabling the averaging on the measurement channels, SMBus
timeout, and software reset.
POWER-UP CALIBRATION
It is recommended that no communication to the part is
initiated until approximately 5 ms after V
DD
has settled to within
10% of its final value. It is generally accepted that most systems
take a maximum of 50 ms to power up. Power-up time is
directly related to the amount of decoupling on the voltage
supply line.
During the 5 ms after V
DD
has settled the part is performing a
calibration routine; any communication to the device will
interrupt this routine and could cause erroneous temperature
measurements. If it is not possible to have V
DD
at its nominal
value by the time 50 ms has elapsed or that communication to
the device has started prior to V
DD
settling, then it is recom-
mended that a measurement be taken on the V
DD
channel
before a temperature measurement is taken. The V
DD
measure-
ment is used to calibrate out any temperature measurement
error due to different supply voltage values.
CONVERSION SPEED
The internal oscillator circuit used by the ADC has the
capability to output two different clock frequencies. This means
that the ADC is capable of running at two different speeds
when doing a conversion on a measurement channel. Thus the
time taken to perform a conversion on a channel can be
reduced by setting C0 of the Control Configuration 3 register
(Address 1Ah). This increases the ADC clock speed from
1.4 kHz to 22 kHz. At the higher clock speed, the analog filters
on the D+ and D input pins (external temperature sensor) are
switched off. This is why the power-up default setting is to have
the ADC working at the slow speed. The typical times for fast
and slow ADC speeds are given in the specification pages.
The ADT7411 powers up with averaging on. This means every
channel is measured 16 times and internally averaged to reduce
noise. The conversion time can also be reduced by turning the
averaging off. This is done by setting Bit C5 of the Control
Configuration 2 register (Address 19h) to a 1.
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| ADT7411ARQZ-REEL | Circular Connector; No. of Contacts:55; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:17-35 |
| ADT7411ARQZ-REEL7 | Circular Connector; No. of Contacts:55; Series:LJT07R; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Socket; Circular Shell Style:Jam Nut Receptacle; Insert Arrangement:17-35 |
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| ADT7411ARQZ | 功能描述:IC DGTL TEMP SNSR 8CH ADC 16QSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標(biāo)準(zhǔn)包裝:3,000 系列:- 功能:溫度開關(guān) 傳感器類型:內(nèi)部 感應(yīng)溫度:85°C 分界點(diǎn) 精確度:±6°C（最小值） 拓?fù)?ADC（三角積分型），比較器，寄存器庫 輸出類型:開路漏極 輸出警報(bào):是 輸出風(fēng)扇:是 電源電壓:2.7 V ~ 5.5 V 工作溫度:-55°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:帶卷 (TR) 其它名稱:ADT6501SRJZP085RL7-ND |
| ADT7411ARQZ | 制造商:Analog Devices 功能描述:Temperature Sensor IC |
| ADT7411ARQZ1 | 制造商:AD 制造商全稱:Analog Devices 功能描述:SPI??-/I2C??-Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC |
| ADT7411ARQZ10 | 制造商:AD 制造商全稱:Analog Devices 功能描述:SPI/I2C Compatible, 10-Bit Digital Temperature Sensor and 8-Channel ADC |
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