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參數(shù)資料
| 型號： | AD7416ARMZ-REEL7 |
| 廠商： | Analog Devices, Inc. |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | 10-Bit Digital Temperature Sensor (AD7416) and Single/Four-Channel ADC (AD7417/AD7418) |
| 中文描述： | 10位數(shù)字溫度傳感器（I2C接口芯片AD7416）和單/四通道ADC（AD7417/AD7418） |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 325K |
| 代理商： | AD7416ARMZ-REEL7 |
REV. G
AD7416/AD7417/AD7418
–15–
With a V
DD
= 3 V, for each 400
μ
s cycle, the AD7416 spends
40
μ
s (or 10% of the time) in conversion mode. It spends 360
μ
s
(or 90% of time) in partial power-down mode. Thus, the aver-
age power dissipated by the AD7416/AD7417/AD7418 is
3
0 1 1
mW
×
.
mW
0 9
.
1 2
.
×
=
mW
Mode 2
For applications where temperature measurements are required at
a slower rate, e.g., every second, power consumption of the part
can be reduced by writing to the part to go to a full power-down
between reads. The current consumption in full power-down is
typically 0.2
μ
A and full power-down is initiated when D0 = 1
in the Configuration Register. When a measurement is required,
a write operation can be performed to power-up the part. The
part then performs a conversion and is returned to power-down.
The temperature value can be read in the full power-down
because the I
2
C bus is continuously active.
The power dissipation in this mode depends on the rate at which
reads take place. Taking the requirements for a temperature
measurement every 100 ms as an example, the optimum power
dissipation is achieved by placing the part in full power-down,
waking it up every 100 ms, letting it operate for 400
μ
s and
putting it into full power-down again. In this case, the average
power consumption is calculated as follows. The part spends
40
μ
s (or 0.04% of time) converting with 3 mW dissipation and
a 99.96 ms (99.96% of time) in full shutdown with 60 nW dissipa-
tion. Thus, the average power dissipation is
3
0 004
60
mW
nW
×
+
.
0 9996
.
1 2
.
μ
W
×
=
The fastest throughput rate at which the AD7416/AD7417/
AD7418 can be operated is 2.5 kHz (i.e., a read every 400
μ
s
conversion period). Since T
OTI
and T
HYST
are 2-byte reads, the
read time with the I
2
C operating at 100 kbit/s would be 270
μ
s.
If temperature reads are called too often, reads will overlap
with conversions, aborting them continuously, which results in
invalid readings.
CONVERT START MODE
The AD7417/AD7418 has an extra mode, set by writing to the
MSB of the Config2 Register.
CONVST
Pin Mode
By setting the
CONVST
Mode Bit to 1, conversions are initiated
only by using the
CONVST
pin. In this method of operation,
CONVST
is normally low.
The rising edge of
CONVST
starts the power-up time. This
power-up time is 4
μ
s. If the
CONVST
high time is longer than
4
μ
s, a conversion is initiated on the falling edge of
CONVST
and the track-and-hold also enters its hold mode at this time. If
the
CONVST
high time is less than 4
μ
s, an internal timer,
initiated by the rising edge of
CONVST
holds off the track-and-
hold and the initiation of conversion until the timer times out
(4
μ
s after the rising edge of
CONVST
, which corresponds with
the power-up time).
CONVST
input remains low at the end of
conversion, thus causing the part to enter its power-down mode.
In this method of operation,
CONVST
is normally low with a
high going pulse controlling the power-up and conversion starts.
The
CONVST
pin should not be pulsed when reading from or
writing to the port.
Figure 17 shows the recommended minimum times for the
CONVST
pulse when the temperature channel is selected.
Figure 18 shows the minimum times an analog input channel
is selected.
APPLICATIONS INFORMATION
SUPPLY DECOUPLING
The AD7416/AD7417/AD7418 should be decoupled with a
0.1
μ
F ceramic capacitor between V
DD
and GND. This is
particularly important if the part is mounted remote from the
power supply.
POWER-ON-RESET
To ensure proper power-on-reset, make sure that the supply
voltage on the V
DD
pin is at 0 V. Refer to application note
AN-588 for more information. A failed power-on-reset can
prevent the default values from being loaded into the AD7416/
AD7417/AD7418 registers. If the correct values are not loaded
into the registers, then the device will not start operating. The
output from the value registers will be a constant value.
To get the device operating again, the registers will have to be
loaded with their default values via the I
2
C bus. Therefore, in
the event of an inadequate power-on-reset and for all three
devices, the following registers should be loaded with their
default values:
Configuration Register 1
—
Default Value = 00h
Configuration Register 2
—
Default Value = 00h
T
HYST
Setpoint Register
—
Default Value = 4B00h
T
OTI
Setpoint Register
—
Default Value = 5500h
MOUNTING THE AD7416
The AD7416/AD7417/AD7418 can be used for surface or air
temperature sensing applications. If the device is cemented to a
surface with thermally conductive adhesive, the die temperature
will be within about 0.2
°
C of the surface temperature, thanks to
the device
’
s low power consumption. Care should be taken to
insulate the back and leads of the device from the air, if the
ambient air temperature is different from the surface tempera-
ture being measured.
The ground pin provides the best thermal path to the die, so the
temperature of the die will be close to that of the printed circuit
ground track. Care should be taken to ensure that this is in good
thermal contact with the surface being measured.
As with any IC, the AD7416/AD7417/AD7418 and its associ-
ated wiring and circuits must be kept free from moisture to
where condensation is more likely to occur. Water resistant
varnishes and conformal coatings can be used for protection.
The small size of the AD7416 package allows it to be mounted
inside sealed metal probes that provide a safe environment for
the device.
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相關代理商/技術參數(shù) |
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| AD7416AR-REEL | 功能描述:IC SENSOR TEMP 10BIT 8-SOIC T/R RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓: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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| AD7416AR-REEL7 | 功能描述:IC SENSOR TEMP 10BIT 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓: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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| AD7416ARZ | 功能描述:IC SENSOR TEMP 10BIT 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓: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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| AD7416ARZREEL | 制造商:Analog Devices 功能描述: |
| AD7416ARZ-REEL | 功能描述:IC SENSOR TEMP 10BIT 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 熱管理 系列:- 標準包裝:2,500 系列:SilentSense™ 功能:溫度監(jiān)控系統(tǒng)（傳感器） 傳感器類型:內部和外部 感應溫度:-55°C ~ 125°C，外部傳感器 精確度:±2°C 本地（最大），±3°C 遠程（最大） 拓撲:ADC（三角積分型），比較器，寄存器庫 輸出類型:I²C?/SMBus? 輸出警報:是 輸出風扇:是 電源電壓: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:8-TSSOP，8-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
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