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参数资料
| 型号： | AD7314ARM |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | Low-Voltage, 10-Bit Digital Temperature Sensor in 8-Lead uSOIC |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 2Cel, SQUARE, SURFACE MOUNT |
| 封装： | MO-187AA, MSOP-8 |
| 文件页数： | 5/8页 |
| 文件大小： | 97K |
| 代理商： | AD7314ARM |
REV. 0
AD7314
–5–
CIRCUIT INFORMATION
The AD7314 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 an
μ
SOIC 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 2.65 V to 2.9 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 AD7314 is –35
°
C to +85
°
C.
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 every 400
μ
s. At this time, the part wakes up and performs
a temperature conversion. This temperature conversion typically
takes 25
μ
s, at which time the part automatically shuts down.
The result of the most recent temperature conversion is avail-
able in the serial output register at any time. The AD7314 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 AD7314 is taken out of shut-
down mode. The conversion result from the last conversion prior
to shutdown can still be read from the AD7314 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 conver-
sion is available, typically 25
μ
s later. Similarly, when the part is
taken out of shutdown mode, the internal clock oscillator is
restarted and the conversion result is available, typically 25
μ
s
later. Reading from the device again before conversion is com-
plete will again 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
°
C
to +127
°
C, but in practice the temperature measurement range
is limited to the operating temperature range of the device (–35
°
C
to +85
°
C).
Table I. Temperature Data Format
Digital Output
DB9 . . . DB0
Temperature
–128
°
C
–125
°
C
–100
°
C
–75
°
C
–50
°
C
–25
°
C
–0.25
°
C
0
°
C
+0.25
°
C
+10
°
C
+25
°
C
+50
°
C
+75
°
C
+100
°
C
+125
°
C
+127
°
C
10 0000 0000
10 0000 1100
10 0111 0000
10 1101 0100
11 0011 1000
11 1001 1100
11 1111 1111
00 0000 0000
00 0000 0001
00 0010 1000
00 0110 0100
00 1100 1000
01 0010 1100
01 1001 0000
01 1111 0100
01 1111 1100
Serial Interface
The serial interface on the AD7314 consists of four wires, CE,
SCLK, SDI and SDO. The interface can be operated in 3-wire
mode with SDI tied to Ground, in which case the interface has
read-only capability, with data being read from the data register
via the SDO line. The SDI line is used to write the part into
standby mode, if required. The CE line is used to select the
device when more than one device is connected to the serial
clock and data lines. To ensure that the serial port is reset prop-
erly after power-up, the CE must be at a logic low before the
first serial port access. The serial clock is active only when CE is
high. For correct data synchronization it is important that the
CE be low when the serial port is not been accessed.
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 AD7314 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 AD7314 accesses data from the
Temperature Value Register while a write operation to the part
writes data to the Control Register. Input data is not loaded into
the Control Register until the rising edge of the fifteenth SCLK
cycle. Data on the SDI line is latched in on the falling edge of
the serial clock whilst data is updated on the SDO line on the
rising edge of the serial clock.
Read Operation
Figure 3 shows the interface diagram for a serial read from the
AD7314. The CE line enables the SCLK input. A leading zero
and ten bits of data are transferred during a read operation. Read
operations occur during streams of 16 clock pulses. Output data
is updated on the rising edge of SCLK. The serial data is accessed
in a number of bytes if ten bits of data are being read. At the
end of the read operation, the SDO line remains in the state of
the last bit of data clocked out of the AD7314 until CE returns
low, at which time the SDO line goes into three-state.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD7314ARM-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI) 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:10BIT DIGITAL TEMP SENSOR (8LD USOIC)IC - Tape and Reel |
| AD7314ARM-REEL7 | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI) 8-Pin MSOP T/R 制造商:Rochester Electronics LLC 功能描述:10BIT DIGITAL TEMP SENSOR (8LD USOIC)IC - Tape and Reel |
| AD7314ARMZ | 功能描述:IC SENSOR TEMP 10BIT DGTL 8-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:3,000 系列:- 功能:温度开关 传感器类型:内部 感应温度:85°C 分界点 精确度:±6°C（最小值） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:开路漏极 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:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:ADT6501SRJZP085RL7-ND |
| AD7314ARMZ-REEL | 制造商:Analog Devices 功能描述:Temp Sensor Digital Serial (4-Wire, SPI) 8-Pin MSOP T/R |
| AD7314ARMZ-REEL7 | 功能描述:IC SENSOR TEMP 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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