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參數(shù)資料
| 型號： | TC74A7-50VCT |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | Tiny Serial Digital Thermal Sensor |
| 中文描述： | 微型串行數(shù)字溫度傳感器 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 430K |
| 代理商： | TC74A7-50VCT |
2002 Microchip Technology Inc.
DS21462B-page 9
TC74
4.0
REGISTER SET AND
PROGRAMMER’S MODEL
COMMAND BYTE
DESCRIPTION
(SMBUS READ_BYTE AND
WRITE_BYTE)
TABLE 4-2:
CONFIGURATION REGISTER
(CONFIG); 8 BITS, READ/
WRITE)
FIGURE 4-1:
DATA_RDY, SHDN
OPERATION LOGIC
DIAGRAM
4.1
Temperature Register (TEMP),
8 Bits, READ ONLY
The binary value (2’s complement format) in this regis-
ter represents temperature of the onboard sensor
following a
conversion cycle. The registers are
automatically updated in an alternating manner.
TABLE 4-3:
TEMPERATURE REGISTER
(TEMP)
I
n the temperature data registers, each unit value repre-
sents 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 tempera-
ture to binary value relationship are shown in Table 4-4
.
4.2
Register Set Summary
The TC74 register set is summarized in Table 4-5. All
registers are 8 bits wide.
COMMAND CODE
FUNCTION
RTR
RWCR
00h
01h
Read Temperature (TEMP)
Read/Write Configuration
(CONFIG)
BIT
POR
FUNCTION
TYPE OPERATION
D[7]
0
STANDBY
Switch
Data Ready*
Read/
Write
Read
Only
N/A
1 = standby,
0 = normal
1 = ready
0 = not ready
N/A
D[6]
0
D[5]-D[0]
0
Reserved -
Always returns
zerowhenread
*Note:
DATA_RDY bit RESET at power-up and SHDN
enable.
V
DD
DATA_RDY
SHDN
tconv
tconv
D[7]
MSB
D[6]
X
D[5]
X
D[4]
X
D[3]
X
D[2]
X
D[1]
X
D[0]
LSB
TABLE 4-4:
TEMPERATURE TO DIGITAL
VALUE CONVERSION (TEMP)
ACTUAL
TEMP.
REGISTERED
TEMP.
BINARY
HEX
+130.00°C
+127.00°C
+126.50°C
+25.25°C
+0.50°C
+0.25°C
0.00°C
-0.25°C
-0.50°C
-0.75°C
-1.00°C
-25.00°C
-25.25°C
-54.75°C
-55.00°C
-65.00°C
+127°C
+127°C
+127°C
+25°C
+1°C
0°C
0°C
0°C
0°C
-1°C
-1°C
-25°C
-25°C
-55°C
-55°C
-65°C
0111 1111
0111 1111
0111 1111
0001 1001
0000 0001
0000 0000
0000 0000
0000 0000
0000 0000
1111 1111
1111 1111
1110 0111
1110 0110
1100 1001
1100 1001
1011 1111
TABLE 4-5:
TC74 REGISTER SET
SUMMARY
NAME
DESCRIPTION
POR State
READ WRITE
TEMP
Internal Sensor
Temp. (2’s
Complement)
CONFIG
Register
0000 0000b*
CONFIG
0000 0000b
*Note:
The TEMP resigister will be immediately updated by
the A/D converter after the DATA_RDY Bit goes High.
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