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參數(shù)資料
| 型號(hào)： | AD7414SRT-1REEL7 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 溫度/濕度傳感器 |
| 英文描述： | DIGITAL TEMP SENSOR-SERIAL, 10BIT(s), 3Cel, RECTANGULAR, SURFACE MOUNT |
| 封裝： | PLASTIC, SOT-23, 6 PIN |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大小： | 182K |
| 代理商： | AD7414SRT-1REEL7 |
AD7414
–6–
REV. PrB
Preliminary Technical Data
PRELIMINAR
Y
TECHNICAL
DA
TA
Table 3. A-Grade Temperature Data Format
Temperature
Digital Output
DB9.............DB0
-128 °C
10 0000 0000
-125 °C
10 0000 1100
-100 °C
10 0111 0000
-75 °C
10 1101 0100
-50 °C
11 0011 1000
-25 °C
11 1001 1100
-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
+125 °C
01 1111 0100
+127 °C
01 1111 1100
Table 2.
S-Grade Temperature Data Format
Temperature
Digital Output
DB9........DB0
-55 °C
10 1100 0000
-50 °C
10 1101 0100
-25 °C
11 0011 1000
0 °C
11 1001 1100
+24.75 °C
11 1111 1111
+25 °C
00 0000 0000
+25.25 °C
00 0000 0001
+50 °C
00 0110 0100
+75 °C
00 1100 1000
+100 °C
01 0010 1100
+125 °C
01 1001 0000
+135 °C
01 1011 1000
INTERNAL REGISTER STRUCTURE
The AD7414 has five internal registers as shown in Figure
4. Four are data registers and one is an address pointer
register. Each data register has an address which is
pointed to by the Address Pointer register when communi-
cating with it. The Temperature Value register is the only
data register that is read only.
Figure 4. AD7414 Register Structure
ADDRESS POINTER REGISTER
The Address Pointer Register is an 8-bit register which
stores an address that points to one of the four data regis-
ters. The first byte of every serial write operation to the
AD7414 is the address of one of the data registers, which
is stored in the Address Pointer Register, and selects the
data register to which subsequent data bytes are written.
Only the two LSBs of this register are used to select a data
register.
Table 4. Address Pointer Register
P7
*
P6
*
P5
*
P4
*
P3
*
P2
*
P1
P0
0000
0
Register Select
Table 5.
Register Address
P1
P0
Registers
0
Temperature Value Register (Read only)
0
1
Configuration Register (Read/Write)
10THIGH Register (Read/Write)
11TLOW Register (Read/Write)
S-Grade Temperature Conversion Formula :-
(1) Temperature = +25°C + (ADC Code*/4)
(2) Temperature = (ADC Code* - 412)/4
* When DB9 = 0, use formula (1). Use DB0 - DB8 in formula.
When DB9 = 1, use formula (2). Use DB0 - DB8 in formula.
A-Grade Temperature Conversion Formula :-
(1) Positive Temperature = ADC Code/4
(2) Negative Temperature = (ADC Code* - 512)/4
*DB9 is removed from the ADC Code.
T E M PE RAT U RE
VA L UE
RE G IST ER
CO NF IG URAT IO N
RE G IST ER
T HIG H
RE G IST ER
T LOW
RE G IST ER
ADDR E S S
PO IN T E R
RE G IST ER
S E RIA L BU S IN T E RF ACE
SD A
SC L
DA T A
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