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TC74A5-5.0VCT データシート(PDF) 9 Page - Microchip Technology

部品番号 TC74A5-5.0VCT
部品情報  Tiny Serial Digital Thermal Sensor
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メーカー  MICROCHIP [Microchip Technology]
ホームページ  http://www.microchip.com
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© 2002 Microchip Technology Inc.
DS21462B-page 9
TC74
4.0
REGISTER SET AND
PROGRAMMER’S MODEL
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 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
registersare8bitswide.
TABLE 4-1:
COMMAND BYTE
DESCRIPTION
(SMBUS READ_BYTE AND
WRITE_BYTE)
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
N/A
*Note: DATA_RDY bit RESET at power-up and SHDN
enable.
VDD
DATA_RDY
SHDN
tconv
tconv
D[7]
D[6]
D[5]
D[4]
D[3]
D[2]
D[1]
D[0]
MSB
X
X
X
X
X
X
LSB
TABLE 4-4:
TEMPERATURE TO DIGITAL
VALUE CONVERSION (TEMP)
ACTUAL
TEMP.
REGISTERED
TEMP.
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
TABLE 4-5:
TC74 REGISTER SET
SUMMARY
NAME
DESCRIPTION
POR State
READ WRITE
TEMP
Internal Sensor
Temp. (2’s
Complement)
0000 0000b*

CONFIG
CONFIG
Register
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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