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參數(shù)資料
| 型號： | AD7814 |
| 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 in 6-Lead SOT-23(10位數(shù)字溫度傳感器) |
| 中文描述： | 10位數(shù)字溫度傳感器在6引腳SOT - 23（10位數(shù)字溫度傳感器） |
| 文件頁數(shù)： | 5/8頁 |
| 文件大?。?/td> | 89K |
| 代理商： | AD7814 |
REV. 0
AD7814
–5–
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 an 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 measure-
ment of the ambient device temperature to be made. The work-
ing measurement range of the AD7814 is –55
°
C to +125
°
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 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 shut-
down 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 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 (–55
°
C
to +125
°
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 AD7814 consists of four wires,
CS
,
SCLK, DIN and DOUT. The interface can be operated in 2-wire
mode with
CS
and 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 Tem-
perature Value Register while a write operation to the part writes
data to the Control Register.
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