參數(shù)資料
型號： MC74
廠商： ON SEMICONDUCTOR
元件分類： 溫度/濕度傳感器
英文描述： Serial Digital Temperature Sensor
中文描述： 串行數(shù)字溫度傳感器
文件頁數(shù)： 7/12頁
文件大?。?/td> 122K
代理商： MC74
MC74
http://onsemi.com
7
REGISTER SET and PROGRAMMER’S MODEL
MC74 Command Set
(SMBus READ_BYTE and WRITE_BYTE)
Command Byte Description
Command
Code
Function
RTR
00h
Read Temperature (TEMP)
RWCR
01h
Read/Write Configuration (CONFIG)
Configuration Register (CONFIG), 8–BITS,
READ/WRITE
Configuration Register (Config)
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
SHDN
Data Rdy
Reserved
Bit
POR
Function
Type
Operation
D[7]
0
STANDBY switch
Read/
Write
1 = standby,
0 = normal
D[6]
0
Data Ready*
Read
Only
1 = ready,
0 = not ready
D[5]—D[0]
0
Reserved — Al-
ways returns zero
when read.
N/A
N/A
*DATA_RDY bit reset at power–up and SHDN enable (see below).
Figure 3. . DATA_RDY, SHDN Operation Logic
Diagram
VDD
tconv
tconv
DATA_RDY
SHDN
Temperature Register (TEMP), 8–Bits,
READ–ONLY
The binary value (2’s complement format) in this register
represents temperature of the integrated sensor following a
conversion cycle. The registers are automatically updated in
an alternating manner.
Temperature Register (TEMP)
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
MSB
x
x
x
x
x
x
LSB
In the temperature data registers, each unit value
represents one degree (Celsius). The value is in
2’s–complement binary format such that a reading of 0000
0000b corresponds to 0
°
C. Examples of this temperature to
binary value relationship are shown in the following table.
Temperature–to–Digital Value Conversion (TEMP)
ACTUAL
TEMPERATURE
TEMPERATURE
REGISTERED
BINARY HEX
+130.00
°
C
+127
°
C
0111 1111
+127.00
°
C
+127
°
C
0111 1111
+126.50
°
C
+127
°
C
0111 1111
+25.25
°
C
+25
°
C
0001 1001
+0.50
°
C
+1
°
C
0000 0001
+0.25
°
C
0
°
C
0000 0000
0.00
°
C
0
°
C
0000 0000
-0.25
°
C
0
°
C
0000 0000
-0.50
°
C
0
°
C
0000 0000
-0.75
°
C
-1
°
C
1111 1111
-1.00
°
C
-1
°
C
1111 1111
-25.00
°
C
-25
°
C
1110 0111
-25.25
°
C
-25
°
C
1110 0110
-54.75
°
C
-55
°
C
1100 1001
-55.00
°
C
-55
°
C
1100 1001
-65.00
°
C
-65
°
C
1011 1111
Register Set Summary
The MC74’s register set is summarized below. All
registers are 8–bits wide.
Name
Description
POR State
Read
Write
TEMP
Internal sensor
temperature (2’s
complement)
0000 0000b*
√
CONFIG
CONFIG register
0000 0000b
√
√
*
NOTE:
The TEMP register immediately will be updated by the
A/D converter after the DATA_RDY bit goes high.
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