TC773.3MCTTR MICROCHIP [Microchip Technology], TC773.3MCTTR Datasheet - Page 10

• Manufacturer Part Number: TC773.3MCTTR
• Description: Thermal Sensor with SPI Interface
• Manufacturer: MICROCHIP [Microchip Technology]

TC77
FIGURE 3-2:
Temperature Register).
FIGURE 3-3:
Diagram.
It is recommended that the user write all ‘0’s or all ‘1’s
to the Configuration register. While the following codes
can be transmitted to the TC77, any other code may
put the TC77 into a test mode reserved by Microchip for
calibration and production verification tests.
• 00 hex
• 01 hex
• 03 hex
• 07 hex
• 0F hex
• 1F hex
• 3F hex
• 7F hex
• FF hex
DS20092A-page 10
CS
CLK
SI/O
HI-Z
TEMPERATURE REGISTER
Notes:
1.
2.
3.
12
1
T
Bit 2 = 0 during power-up for the first
temperature conversion.
Bit 2 =1 after the completion of the first tem-
perature conversion following power-up or a
reset event.
Bits 1 and 0 are “DON”T CARES”.
CLK
SI/O
CS
t
11
CS-SCK
T
10
T
HI-Z
T
9
Temperature Read Timing Diagram - (Reading only the first 13 Bits of the
Temperature Read Followed By A Write To The Configuration Register Timing.
T
8
T
7
12
1
T
T
6
t
CS-SCK
11
T
8
T
5
T
4
10
1
T
T
3
T
9
T
2
T
1
T
8
T
0
T
7
BIT
2
T
HI-Z
6
8
8
T
5
15
CONFIGURATION REGISTER
Notes:
1.
2.
C
1
T
4
The following communication steps can be used to
obtain the Manufacturer's ID and put the device into the
Continuous Conversion mode. The Manufacturer’s ID
register is only accessible for a read operation, if the
TC77 is in Shutdown mode.
1.
2.
3.
4.
5.
6.
The time between a complete temperature conversion
and data transmission is approximately 300 msec.
14
C
XX00 = Continuous Conversion Mode
XXFF = Shutdown Mode
13
C
T
3
CS goes low to initiate the communication cycle.
Read 16 bits of temperature data from the
Temperature register.
Write 16 bits of data (i.e. XXFF hex) to the Con-
figuration register to enter Shutdown mode.
Read the 16 bits from the Manufacturer's ID reg-
ister (C15:C8 = 54 hex) to verify that the sensor
is a Microchip device.
Write 8 to 16 bits of data (00 or 0000 hex) to
enter Continuous Conversion Mode.
Return CS high to terminate the communication
cycle.
12
C
T
2
11
C
10
C
T
1
C
9
13
T
0
C
8
8
C
7
1
C
2002 Microchip Technology Inc.
6
C
5
C
4
HI-Z
C
3
C
2
C
1
8
C
0
HI-Z