參數(shù)資料
型號(hào)： ADT7318ARU
廠商： ANALOG DEVICES INC
元件分類(lèi)： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT
封裝： QSOP-16
文件頁(yè)數(shù)： 6/24頁(yè)
文件大?。?/td> 279K
代理商： ADT7318ARU
–14–
REV. PrH
Preliminary Technical Data
PRELIMINARY TECHNICAL DATA
ADT7316/7317/7318
Figure 6. Signal Conditioning for External Diode temperature Sensors
D+
D-
REMOTE
SENSING
TRANSISTOR
(2N3906)
LOWPASS FILTER
fc = 65kHz
VDD
TO ADC
VOUT+
VOUT-
IN x I
IBIAS
BIAS
DIODE
OPTIONAL CAPACITOR, UP TO
3nF MAX. CAN BE ADDED TO
IMPROVE HIGH FREQUENCY
NOISE REJECTION IN NOISY
ENVIRONMENTS
C1
TEMPERATURE VALUE FORMAT
One LSB of the ADC corresponds to 0.25°C. The ADC
can theoretically measure a temperature span of 255 °C.
The internal temperature sensor has a practical low value
limit of -40 °C due to device maximum ratings. It is pos-
sible to measure the full temperature span using the exter-
nal temperature sensor. The temperature data format is
shown in Tables 1.
The result of the internal or external temperature mea-
surements is stored in the temperature value registers, and
is compared with limits programmed into the Internal or
External High and Low Registers.
TABLE 1. Temperature Data Format (Internal and Ex-
ternal Temperature)
Temperature
Digital Output
-40 °C
11 0110 0000
-25 °C
11 1001 1100
-10 °C
11 1101 1000
-0.25 °C
11 1111 1111
0 °C
00 0000 0000
+0.25 °C
00 0000 0001
+10 °C
00 0010 1000
+25 °C
00 0110 0100
+50 °C
00 1100 1000
+75 °C
01 0010 1100
+100 °C
01 1001 0000
+105 °C
01 1010 0100
Temperature Conversion Formula:
1. Positive Temperature = ADC Code/4
2. Negative Temperature = (ADC Code* - 512)/4
*DB9 is removed from the ADC Code
ADT7316/7317/7318 REGISTERS
The ADT7316/17/18 contains registers that are used to
store the results of external and internal temperature mea-
surements, high and low temperature limits, set output
DAC voltage levels, configure and control the device. A
description of these registers follows, and further details
are given in Tables 2 to 11.
Table 2. List of ADT7813 Registers
RD/WR
Name
Power-on
Address
Default
3Eh
Manufacturer’s ID
41h
3Fh
Die Revision Register
00h
7Eh
Test 1 Register
00h
7Fh
Test 2 Register
00h
One Shot Register
00h
01h
Configuration Register 1
00h
02h
Configuration Register 2
00h
03h
DAC (
LDAC) Mask Register
00h
04h
Mask Register
00h
05h
Internal Temperature Offset Register
00h
06h
External Temperature Offset Register
00h
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