參數(shù)資料
型號： TC74A6-5.0VCTTR
元件分類： 模擬信號調理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO5
封裝： SOT-23A, 5 PIN
文件頁數(shù)： 15/16頁
文件大?。?/td> 338K
代理商： TC74A6-5.0VCTTR
TC74
DS21462C-page 8
2002 Microchip Technology Inc.
4.0
REGISTER SET AND
PROGRAMMER’S MODEL
TABLE 4-1:
COMMAND BYTE
DESCRIPTION
(SMBUS/I2C 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)
In 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
temperature to binary value relationship are shown in
.
TABLE 4-4:
TEMPERATURE-TO-DIGITAL
VALUE CONVERSION
(TEMP)
4.2
Register Set Summary
The TC74 register set is summarized in Table 4-5. All
registers are 8 bits wide.
TABLE 4-5:
TC74 REGISTER SET
SUMMARY
Command
Code
Function
RTR
00h
Read Temperature (TEMP)
RWCR
01h
Read/Write Configuration
(CONFIG)
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 -
Always
returns zero
when read
N/A
Note 1: *DATA_RDY bit RESET at power-up and
SHDN enable.
VDD
DATA_RDY
SHDN
tconv
D[7]
D[6]
D[5]
D[4] D[3] D[2] D[1] D[0]
MSB
X
LSB
Actual
Temperature
Registered
Temperature
Binary
Hex
+130.00°C
+127°C
0111 1111
+127.00°C
+127°C
0111 1111
+126.50°C
+126°C
0111 1110
+25.25°C
+25°C
0001 1001
+0.50°C
0°C
0000 0000
+0.25°C
0°C
0000 0000
0.00°C
0°C
0000 0000
-0.25°C
-1°C
1111 1111
-0.50°C
-1°C
1111 1111
-0.75°C
-1°C
1111 1111
-1.00°C
-1°C
1111 1111
-25.00°C
-25°C
1110 0111
-25.25°C
-26°C
1110 0110
-54.75°C
-55°C
1100 1001
-55.00°C
-55°C
1100 1001
-65.00°C
-65°C
1011 1111
Name
Description
POR
State
Read Write
TEMP
Internal Sensor
Temperature (2’s
Complement)
0000
b (1)
√
N/A
CONFIG
Register
0000
b
√√
Note 1: The TEMP register will be immediately
updated by the A/D converter after the
DATA_RDY Bit goes high.
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