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參數(shù)資料
| 型號： | ADT7518ARQ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | SPI/I2C Compatible, Temperature Sensor, 4-Channel ADC and Quad Voltage Output DAC |
| 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)： | 22/40頁 |
| 文件大?。?/td> | 1217K |
| 代理商： | ADT7518ARQ |
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ADT7518
Rev. A | Page 22 of 40
WATCHDOG
LIMIT
COMPARISONS
INTERRUPT
MASK
REGISTERS
CONTROL
CONFIGURATION
REGISTER 1
ISTATUS
REGISTER
(TEMP AND
AIN1 TO AIN4)
INTERRUPT
STATUS
REGISTER 2
(V
DD
)
S
S
READ RESET
S/W RESET
INTERNAL
TEMP
INT/INT
(LATCHED OUTPUT)
INT/INT
ENABLE BIT
EXTERNAL
TEMP
V
DD
DIODE
FAULT
AIN1–AIN4
0
Figure 49. Interrupt Structure
AIN Interrupts
The measured results from the AIN inputs are compared with
the AIN V
HIGH
(greater than comparison) and V
LOW
(less than or
equal to comparison) limits. An interrupt occurs if the AIN
inputs exceed or equal the limit registers. These voltage limits
are stored in on-chip registers. Note that the limit registers are
8 bits long while the AIN conversion result is 10 bits long. If the
voltage limits are not masked out, then any out-of-limit com-
parisons generate flags that are stored in the Interrupt Status 1
register (Address = 00h) and one or more out-of-limit results
will cause the INT/INT output to pull either high or low
depending on the output polarity setting. It is good design
practice to mask out interrupts for channels that are of no
concern to the application. Figure 49 shows the interrupt
structure for the ADT7518. It gives a block diagram
representation of how the various measurement channels affect
the INT/INT pin.
FUNCTIONAL DESCRIPTION—MEASUREMENT
Temperature Sensor
The ADT7518 contains an ADC with special input signal
conditioning to enable operation with external and on-chip
diode temperature sensors. When the ADT7518 is operating in
single-channel mode, the ADC continually processes the
measurement taken on one channel only. This channel is
preselected by Bits C0:C2 in the Control Configuration 2
register (Address 19h). When in round robin mode, the analog
input multiplexer sequentially selects the V
DD
input channel, the
on-chip temperature sensor to measure its internal temperature,
either the external temperature sensor or AIN1 and AIN2,
AIN3, and then AIN4. These signals are digitized by the ADC
and the results are stored in the various value registers.
The measured results from the temperature sensors are com-
pared with the internal and external T
HIGH
, T
LOW
limits. These
temperature limits are stored in on-chip registers. If the temp-
erature limits are not masked, any out-of-limit comparisons
generate flags that are stored in the Interrupt Status 1 register.
One or more out-of-limit results will cause the INT/INT output
to pull either high or low depending on the output polarity
setting.
Theoretically, the temperature measuring circuit can measure
temperatures from –128°C to +127°C with a resolution of
0.25°C. However, temperatures outside T
A
are outside the
guaranteed operating temperature range of the device. Temp-
erature measurement from –128°C to +127°C is possible using
an external sensor.
Temperature measurement is initiated by three methods. The
first method is applicable when the part is in single-channel
measurement mode. The temperature is measured 16 times and
internally averaged to reduce noise. In single-channel mode, the
part is continuously monitoring the selected channel, i.e., as
soon as one measurement is taken another one is started on the
same channel. The total time to measure a temperature channel
with the ADC operating at slow speed is typically 11.4 ms
(712 μs × 16) for the internal temperature sensor and 24.22 ms
(1.51 ms × 16) for the external temperature sensor. The new
temperature value is stored in two 8-bit registers and is ready
for reading by the I
2
C or SPI interface. The user has the option
of disabling the averaging by setting Bit 5 in the Control
Configuration 2 register (Address 19h). The ADT7518 defaults
on power-up with averaging enabled.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ADT7518ARQ-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R 制造商:Rochester Electronics LLC 功能描述:DTS,8-BIT QUAD DAC,4 ANALOG INPUTS I.C. - Tape and Reel |
| ADT7518ARQ-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R 制造商:Analog Devices 功能描述:TEMP SENSOR ANLG 4-WIRE/SPI 16QSOP - Tape and Reel 制造商:Rochester Electronics LLC 功能描述:DTS,8-BIT QUAD DAC,4 ANALOG INPUTS I.C. - Tape and Reel |
| ADT7518ARQ-U3 | 制造商:Analog Devices 功能描述:- Bulk |
| ADT7518ARQZ | 功能描述:IC SENSOR TEMP QD ADC/DAC 16QSOP 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(nèi)部和外部 感應(yīng)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(yīng)商設(shè)備封裝:8-MSOP 包裝:帶卷 (TR) 其它名稱:MIC284-2BMMTRMIC284-2BMMTR-ND |
| ADT7518ARQZ-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Analog Serial (4-Wire, SPI, I2C) 16-Pin QSOP T/R |
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