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| 型号： | AD7814ARMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/8页 |
| 文件大小： | 123K |
| 描述： | IC DGTL TEMP SENSOR 10BIT 8-MSOP |
| 标准包装： | 50 |
| 功能： | 温度监控系统（传感器） |
| 传感器类型： | 内部 |
| 感应温度： | -55°C ~ 125°C |
| 精确度： | ±2°C |
| 拓扑： | ADC，寄存器库 |
| 输出类型： | MICROWIRE?，QSPI?，SPI? |
| 输出警报： | 无 |
| 输出风扇： | 无 |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
| 产品目录页面： | 798 (CN2011-ZH PDF) |
REV. E
5
AD7814
CIRCUIT INFORMATION
The AD7814 is a 10-bit digital temperature sensor. The part
houses an on-chip temperature sensor, a 10-bit A/D converter,
a reference, and serial interface logic functions in a SOT-23
package. The A/D converter section consists of a conventional
successive-approximation converter based around a capacitor
DAC. The parts are capable of running on a 2.7 V to 5.5 V
power supply.
The on-chip temperature sensor allows an accurate measurement
of the ambient device temperature to be made. The working
measurement range of the AD7814 is 55癈 to +125癈.
CONVERTER DETAILS
The conversion clock for the part is internally generated so no
external clock is required except when reading from and writing
to the serial port. In normal mode, an internal clock oscillator
runs the automatic conversion sequence. A conversion is initi-
ated approximately every 350 祍. At this time, the part wakes up
and performs a temperature conversion. This temperature con-
version typically takes 25 祍, at which time the part automati-
cally shuts down. The result of the most recent temperature
conversion is available in the serial output register at any time.
Once the conversion is finished, an internal oscillator starts
counting and is designed to time out every 350 祍. The AD7814
then powers up and does a conversion. Please note that if the
CS is brought low every 350 祍 (?0%), then the same tempera-
ture value will be output onto the DOUT line every time with-
out changing. It is recommended that the CS line is not brought
low every 350 祍 (?0%). The ?0% covers process variation.
The CS should become active (high to low) outside this range.
The device is designed to autoconvert every 350 祍. If the
AD7814 is accessed during the conversion process, an internal
signal is generated to prevent any update of the temperature
value register during the conversion. Otherwise the user could
read back spurious data. The design of this feature results in this
internal lockout signal being reset only at the start of the next
autoconversion. Therefore, if the CS line goes active before the
internal lockout signal has been reset to its inactive mode, the
internal lockout signal will not be reset. To ensure that no lock-
out signal is set, bring the CS low at a greater or less time than
350 祍 (?0%). This will mean that the AD7814 is not inter-
rupted during a conversion process. The AD7814 can be placed
in a shutdown mode, via the control register, in which case the
on-chip oscillator is shut down and no further conversions are
initiated until the AD7814 is taken out of shutdown mode. The
conversion result from the last conversion prior to shutdown can
still be read from the AD7814 even when it is in shutdown mode.
In the automatic conversion mode, every time a read or write
operation takes place, the internal clock oscillator is restarted at
the end of the read or write operation. The result of the con-
version is typically available 25 祍 later. Similarly, when the
part is taken out of shutdown mode, the internal clock oscil-
lator is restarted and the conversion result is typically available
25 祍 later. Reading from the device before conversion is com-
plete will provide the same set of data.
TEMPERATURE VALUE REGISTER
The temperature value register is a read-only register that stores
the temperature reading from the ADC in 10-bit twos comple-
ment format. The temperature data format is shown in Table I.
This shows the full theoretical range of the ADC from 128癈
to +127癈, but in practice the temperature measurement range
is limited to the operating temperature range of the device (55癈
to +125癈). A typical performance curve is shown in Figure 7.
Table I. Temperature Data Format
Digital Output
Temperature
DB9 . . . DB0
128癈
10 0000 0000
125癈
10 0000 1100
100癈
10 0111 0000
75癈
10 1101 0100
50癈
11 0011 1000
25癈
11 1001 1100
0.25癈
11 1111 1111
0癈
00 0000 0000
+0.25癈
00 0000 0001
+10癈
00 0010 1000
+25癈
00 0110 0100
+50癈
00 1100 1000
+75癈
01 0010 1100
+100癈
01 1001 0000
+125癈
01 1111 0100
+127癈
01 1111 1100
SERIAL INTERFACE
The serial interface on the AD7814 consists of four wires CS,
SCLK, DIN, and DOUT. The interface can be operated in
3-wire mode with DIN tied to Ground, in which case the inter-
face has read-only capability, with data being read from the data
register via the DOUT line. The DIN line is used to write the part
into standby mode, if required. The CS line is used to select the
device when more than one device is connected to the serial
clock and data lines.
The part operates in a slave mode and requires an externally
applied serial clock to the SCLK input to access data from the
data register. The serial interface on the AD7814 is designed to
allow the part to be interfaced to systems that provide a serial
clock that is synchronized to the serial data, such as the 80C51,
87C51, 68HC11, 68HC05, and PIC16Cxx microcontrollers, as
well as DSP processors.
A read operation from the AD7814 accesses data from the
temperature value register, while a write operation to the part
writes data to the control register.
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| AD7814ARMZ | 制造商:Analog Devices 功能描述:IC TEMP SENSOR 10BIT ?2 MSOP-8 |
| AD7814ARMZ-REEL | 功能描述:IC TEMP SNSR 10BIT DGTL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:2,500 系列:SilentSense™ 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-55°C ~ 125°C，外部传感器 精确度:±2°C 本地（最大），±3°C 远程（最大） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:I²C?/SMBus? 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MSOP 包装:带卷 (TR) 其它名称:MIC284-2BMMTRMIC284-2BMMTR-ND |
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