參數(shù)資料
型號(hào)： ADT7470ARQZ
廠商： ANALOG DEVICES INC
元件分類： 溫度/濕度傳感器
英文描述： DIGITAL TEMP SENSOR-SERIAL, 7BIT(s), RECTANGULAR, SURFACE MOUNT
封裝： ROHS COMPLIANT, MO-137AB, QSOP-16
文件頁(yè)數(shù)： 6/40頁(yè)
文件大小： 962K
代理商： ADT7470ARQZ
ADT7470
Rev. C | Page 14 of 4
0
TEMPERATURE READBACK BY THE HOST
The user cannot read the ADT7470 temperature register values
if the ADT7470 is in the process of a temperature measurement.
The user must wait until the data from all the TMP05s and
TMP06s in the chain are received by the ADT7470 before
reading these values. Otherwise, the temperature registers
may store an incorrect value. It is recommended to wait at
least 200 ms for each TMP05 and TMP06 in the chain. The
recommended procedure is as follows:
1.
Set Register 40 Bit[7] = 1. This starts the temperature
measurements.
2.
Wait 200 ms for each TMP05/TMP06 in the loop.
3.
Set Register 40 Bit[7] = 0.
4.
Read the temperature registers.
TEMPERATURE DATA FORMAT
Temperature data on the ADT7470 is stored in an 8-bit format,
with the 7 LSBs being the temperature, and the MSB acting as
the sign bit. Use the following formulae when reading back
from the temperature registers, o calculate the temperature:
Positive Temperature = ADC Code (decimal)
Negative Temperature = ADC (decimal) minus 256
For negative temperature readings, the MSB is always set to 1.
Example:
1.
Temperature read back from register 0x20: 0xFF.
2.
Convert into decimal format. 0xFF = 255 (decimal).
3.
Check if MSB is set to 1. It is in this example. Therefore,
use negative temperature formula, ADC (d) minus 256.
4.
Temperature = 255 256 = 1°C.
Table 8. Temperature Data Format
Temperature (°C)
Digital Output (8 Bit)
128
1000 0000
125
1000 0011
100
1001 1100
75
1011 0101
50
1100 1110
25
1110 0111
10
1111 0110
+0
0000 0000
+10
0000 1010
+25
0001 1001
+50
0011 0010
+75
0100 1011
+100
0110 0100
+125
0111 1101
+175
0111 1111
40ms
76ms
100ms
tSTART
ADT7470
t1 STOP
t2 STOP
TMP_START
TMP_IN
ADT7470
TMP05 1
TEMP = 25
°C
TMP05 2
TEMP = 120
°C
NOTES:
tSTART IS GENERATED BY THE ADT7470 AND IS THE START PULSE FOR TMP05 1.
t1 STOP IS GENERATED BY TMP05 1 AND IS THE START PULSE FOR TMP05 2.
t2 STOP IS GENERATED BY TMP05 2.
EACH START/STOP PULSE IS TYPICALLY 25
μs.
TMP05s MUST BE IN DAISY-CHAIN MODE.
SEE THE TMP05 DATA SHEET FOR MORE INFORMATION.
t2
t1
t1 LOW
t1 HIGH
t2 LOW
t2 HIGH
04684-0-032
Figure 14. Typical Timing Diagram of ADT7470 with Two TMP05s Connected in Daisy-Chain Mode
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