參數(shù)資料
型號(hào)： ADT7408CCPZ2-REEL
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 12BIT(s), 4Cel, SQUARE, SURFACE MOUNT
封裝： 3 X 3 MM, MO-229VEED-4, LFCSP-8
文件頁(yè)數(shù)： 20/22頁(yè)
文件大?。?/td> 570K
代理商： ADT7408CCPZ2-REEL
Preliminary Technical Data
ADT7408
Rev. PrC | Page 7 of 22
TEMPERATURE DATA FORMAT
The 16-bit value used in the three Temperature Trip Point
Registers and Temperature Register is in Two’s complement
format. The Temperature Register has a 12-bit resolution with
256oC range with one LSB = 0.0625 oC (256oC/212). The
temperature data in the three Temperature Trip Point Registers
(Alarm Upper, Alarm Lower and Critical), is a 10-bit format
with 256oC range with one LSB = 0.25 oC. D12 in all these
registers represent the sign bit such that 0 = positive and 1 =
negative. In Two’s Complement format, the data bits are
inverted and add 1 if the sign bit is negative.
For example if the following values are read in the Temperature
Register:
1. A T1 value of 0x019C is 0000 0001 1001 1100 in binary, thus
T1 = + 0x19C * 0.0625 = +25.75oC
2. A T2 value of 0x07C0 is 0000 0111 1100 0000 in binary, thus
T2 = 0x7C0 * 0.0625 = +124oC
3. A T3 value of 0x1E74 is 0001 1110 0111 0100 in binary. Since
the sign bit is negative, the data becomes 0001 1000 1100, thus
T3 = - 0x18C * 0.0625 = -24.75oC
If the following value is read from the Critical Temperature
Register
1. A value of 0x07C0 is 0000 0111 1100 0000 in binary, thus the
critical temperature = + 0x1F0 * 0.25 = +124oC
The temperature calculations above are cumbersome, the more
convenient temperature conversion formula can be found in
equations (1) to (4) later.
Although one LSB of the ADC corresponds to 0.0625°C. The
ADC can theoretically measure a temperature range of 255°C
(128°C to +127°C ), but the ADT7408 is guaranteed to
measure a low value temperature limit of 55°C to a high value
temperature limit of +125°C.
Reading back the temperature from the temperature value
register requires a two byte read unless only a 1°C (8-bits)
resolution is required, then a one byte read is required.
Designers used to using a 9-bit temperature data format can
still use the ADT7408 by ignoring the last three LSBs of the 12-
bit temperature value. These three LSBs are Bit D4 to Bit D6 in
Table 5.
Table 5. 12-Bit Temperature Data Format
Temperature
Digital Output (Binary)
D11 to D0
Digital Output (Hex)
55°C
1100 1001 0000
C90
50°C
1100 1110 0000
CE0
25°C
1110 0110 1111
E6F
0.0625°C
1111 1111 1111
FFF
0°C
0000 0000 0000
000
+0.0625°C
0000 0000 0001
0x001
+10°C
0000 1010 0000
0x0A0
+25°C
0001 1001 0000
0x190
+50°C
0011 0010 0000
0x320
+75°C
0100 1011 0000
0x4B0
+100°C
0110 0100 0000
0x640
+125°C
0111 1101 0000
0x7D0
Temperature Conversion Formulas
12-Bit Temperature Data Format
Positive Temperature = ADC Code(d)/16
(1)
Negative Temperature = (ADC Code(d) 4096)/16
(2)
For ADC Code, Bit D12 (sign bit) is removed from the ADC
code.
10-Bit Temperature Data Format
Positive Temperature = ADC Code(d)/4
(3)
Negative Temperature = (ADC Code(d) – 1024)/4
(4)
For ADC Code, Bit D12 (sign bit) is removed from the ADC
code
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