TC74DEMO Microchip Technology, TC74DEMO Datasheet - Page 8

• Manufacturer Part Number: TC74DEMO
• Description: DEMO BOARD FOR TC74 THERML SENSR
• Manufacturer: Microchip Technology

Specifications of TC74DEMO

• Processor To Be Evaluated: TC74
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

TC74
4.0
TABLE 4-1:
TABLE 4-2:
FIGURE 4-1:
Operation Logic Diagram.
4.1
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.
DS21462C-page 8
DATA_RDY
Note 1: *DATA_RDY bit RESET at power-up and
Command
D[5]-
D[7]
D[6]
D[0]
RWCR
Bit
RTR
SHDN
V
DD
REGISTER SET AND
PROGRAMMER’S MODEL
Temperature Register (TEMP),
8 Bits, READ ONLY
POR
SHDN enable.
0
0
0
Code
00h
01h
Switch
Reserved -
Always
returns zero
when read
STANDBY
Data Ready *
COMMAND BYTE
DESCRIPTION
(SMBUS/I
WRITE_BYTE)
CONFIGURATION REGISTER
(CONFIG); 8 BITS, READ/
WRITE)
Function
DATA_RDY, SHDN
Read Temperature (TEMP)
Read/Write Configuration
(CONFIG)
t
conv
2
C READ_BYTE AND
Read/
Write
Read
Type
Only
Function
N/A
1 = standby,
0 = normal
1 = ready
0 = not ready
N/A
Operation
t
conv
TABLE 4-3:
I
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
TABLE 4-4:
4.2
The TC74 register set is summarized in Table 4-5. All
registers are 8 bits wide.
TABLE 4-5:
n temperature data registers, each unit value repre-
Note 1: The TEMP register will be immediately
CONFIG
MSB
D[7]
Temperature
Name
TEMP
+130.00°C
+127.00°C
+126.50°C
+25.25°C
-25.00°C
-25.25°C
-54.75°C
-55.00°C
-65.00°C
+0.50°C
+0.25°C
-0.25°C
-0.50°C
-0.75°C
-1.00°C
Actual
0.00°C
D[6]
Register Set Summary
.
X
updated by the A/D converter after the
DATA_RDY Bit goes high.
Temperature (2’s
Internal Sensor
Complement)
Description
CONFIG
Register
D[5]
X
TEMPERATURE REGISTER
(TEMP)
TEMPERATURE-TO-DIGITAL
VALUE CONVERSION
(TEMP)
TC74 REGISTER SET
SUMMARY
Temperature
Registered
+127°C
+127°C
+126°C
+25°C
-25°C
-26°C
-55°C
-55°C
-65°C
D[4]
-1°C
-1°C
-1°C
-1°C
 2002 Microchip Technology Inc.
0°C
0°C
0°C
X
D[3] D[2] D[1]
0000b
X
0000b
State
0000
0000
POR
X
(1)
0111 1111
0111 1111
0111 1110
0001 1001
0000 0000
0000 0000
0000 0000
1111 1111
1111 1111
1111 1111
1111 1111
1110 0111
1110 0110
1100 1001
1100 1001
1011 1111
Binary
Read Write
Hex
√
√
X
LSB
D[0]
N/A
√