MICROCHIP TC77

M
TC77
Thermal Sensor with SPI™ Interface
Features
Description
• Digital Temperature Sensing in 5-Pin SOT-23A
and 8-Pin SOIC Packages
• Outputs Temperature as a 13-Bit Digital Word
• SPI and MICROWIRE™ Compatible Interface
• Solid State Temperature Sensing
• ±1°C (max.) accuracy from +25°C to +65°C
• ±2°C (max.) accuracy from -40°C to +85°C
• ±3°C (max.) accuracy from -55°C to +125°C
• 2.7V to 5.5V Operating Range
• Low Power
- 250 µA (typ.) Continuous Conversion Mode
- 0.1 µA (typ.) Shutdown Mode
The TC77 is a serially accessible digital temperature
sensor particularly suited for low cost and small formfactor applications. Temperature data is converted from
the internal thermal sensing element and made available at anytime as a 13-bit two’s compliment digital
word. Communication with the TC77 is accomplished
via a SPI and MICROWIRE compatible interface. It has
a 12-bit plus sign temperature resolution of 0.0625°C
per Least Significant Bit (LSb). The TC77 offers a temperature accuracy of ±1.0°C (max.) over the temperature range of +25°C to +65°C. When operating, the
TC77 consumes only 250 µA (typ.). The TC77’s Configuration register can be used to activate the low
power Shutdown mode, which has a current consumption of only 0.1 µA (typ.). Small size, low cost and ease
of use make the TC77 an ideal choice for implementing
thermal management in a variety of systems.
Typical Applications
• Thermal Protection for Hard Disk Drives and
Other PC Peripherals
• PC Card Devices for Notebook Computers
• Low Cost Thermostat Controls
• Industrial Control
• Office Equipment
• Cellular Phones
• Thermistor Replacement
Package Types
SOT-23-5
CS
VSS
SOIC
VDD
1
TC77
SCK
SI/O
SCK
NC
SI/O
VDD
1
TC77
VSS
CS
NC
NC
Block Diagram
Typical Application
VDD
VDD
Internal
Diode
Temperature
Sensor
13-Bit
Sigma Delta
A/D Converter
TC77
VDD
TC77
Manufacturer
ID Register
Serial
Port
Interface
Temperature
Register
VSS
0.1µF
Configuration
Register
 2002 Microchip Technology Inc.
PICmicro®
MCU
CS
CS
AN0
SI/O
SCK
SCK
SI/O
SDI
SCK
VSS
DS20092A-page 1
TC77
1.0
1.1
ELECTRICAL
CHARACTERISTICS
PIN FUNCTION TABLE
Name
Absolute Maximum Ratings †
VDD ........................................................................6.0V
All inputs and outputs w.r.t. VSS ..... -0.3V to VDD +0.3V
Storage temperature .......................... -65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
Junction Temperature......................................... 150°C
Function
SI/O
Serial Data Pin
SCK
Serial Clock
VSS
Ground
CS
Chip Select (Active-Low)
NC
No Connection
VDD
Power Supply
ESD protection on all pins:
Human Body Model (HBM).............................. >4 kV
Machine Model (MM) ......................................>200V
† Notice: Stresses above those listed under "Maximum
Ratings" may cause permanent damage to the device. This is
a stress rating only and functional operation of the device at
those or any other conditions above those indicated in the
operation listings of this specification is not implied. Exposure
to maximum rating conditions for extended periods may affect
device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise noted, all parameters apply at VDD = 2.7V to 5.5V and
TA = -55°C to +125°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Operating Voltage Range
VDD
2.7
—
5.5
V
Note 1
Operating Current
IDD
—
250
400
µA
Continuous Temperature
Conversion Mode
VPOR
1.2
1.6
2.2
V
VDD falling or rising edge
IDD-
—
0.1
1.0
µA
Shutdown Mode
—
13
—
Bits
ADC LSb = 0.0625°C/bit
(Note 4)
tCT
—
300
400
ms
TERR
-1.0
-2.0
-3.0
—
—
—
+1.0
+2.0
+3.0
°C
Power Supply
Power-On Reset Threshold
Standby Supply Current
STANDBY
Temperature to Bits Converter
Resolution
Temperature Conversion Time
Temperature Accuracy
(Note 1)
+25°C < TA < +65°C
-40°C < TA < +85°C
-55°C < TA < +125°C
TC77-3.3MXX: VDD = 3.3V
TC77-5.0MXX: VDD = 5.0V
Note 1: The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V to 5.5V. However, the temperature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of
3.3V and 5.0V, respectively. As V DD varies from the nominal operating value, the accuracy may be
degraded (Refer to Figures 2-6 and 2-7).
2: All time measurements are measured with respect to the 50% point of the signal.
3: Load Capacitance, C L = 80 pF, is used for AC timing measurements of output signals.
4: Resolution = Temperature Range/No. of Bits = (+255°C – -256°C) / (213)
Resolution = 512/8192 = 0.0625°C/Bit
DS20092A-page 2
 2002 Microchip Technology Inc.
TC77
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, all parameters apply at VDD = 2.7V to 5.5V and
TA = -55°C to +125°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
High Level Input Voltage
VIH
0.7 VDD
—
VDD + 0.3
V
Low Level Input Voltage
VIL
-0.3
—
0.3 VDD
V
High Level Output Voltage
VOH
2.4
—
—
V
IOH = -400 µA
Low Level Output Voltage
VOL
—
—
0.4
V
IOL = +2 mA
Input Current
IIN(0),
IIN(1)
-1.0
-1.0
—
—
+1.0
+1.0
µA
VIN = GND
VIN = VDD
0.35
0.8
—
V
SI/O, SCK
CIN, COUT
—
20
—
pF
IO_LEAK
-1.0
—
—
—
—
+1.0
µA
fCLK
DC
—
7.0
MHz
CS Fall to First Rising SCK
Edge
tCS-SCK
100
—
—
ns
CS Low to Data Out Delay
tCS-SI/O
—
—
70
ns
SCK Fall to Data Out Delay
tDO
—
—
100
ns
CS High to Data Out
Tri-state
tDIS
—
—
200
ns
SCK High to Data In Hold Time
tHD
50
—
—
ns
Data In Set-up Time
tSU
30
—
—
ns
Thermal Resistance, SOT23-5
θJA
—
230
—
°C/W
Thermal Resistance, 8L-SOIC
θJA
—
163
—
°C/W
Digital Input/Output
Input Hysteresis
Pin Capacitance
Tri-state Output Leakage
Current
VO = GND
VO = V DD
Serial Port AC Timing (Notes 2, 3)
Clock Frequency
Thermal Package Resistance
Note 1: The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V to 5.5V. However, the temperature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of
3.3V and 5.0V, respectively. As V DD varies from the nominal operating value, the accuracy may be
degraded (Refer to Figures 2-6 and 2-7).
2: All time measurements are measured with respect to the 50% point of the signal.
3: Load Capacitance, C L = 80 pF, is used for AC timing measurements of output signals.
4: Resolution = Temperature Range/No. of Bits = (+255°C – -256°C) / (213)
Resolution = 512/8192 = 0.0625°C/Bit
 2002 Microchip Technology Inc.
DS20092A-page 3
TC77
Data Output Timing
CS
tCS-SCK
1/fCLK
SCK
tCS-SI/O
SI/O
HI-Z
tDO
tDIS
LSb
MSb
HI-Z
SI/O Data Input Set-up and Hold Timing (Data is clocked on the rising edge of SCK)
CS
CS
SCK
SCK
tHD
tSU
SI/O
FIGURE 1-1:
DS20092A-page 4
tHD
HI-Z
SI/O
tSU
HI-Z
Timing Diagrams.
 2002 Microchip Technology Inc.
TC77
2.0
TYPICAL PERFORMANCE CURVES
Note:
The graphs and tables provided following this note are a statistical summary based on a limited number of
samples and are provided for informational purposes only. The performance characteristics listed herein
are not tested or guaranteed. In some graphs or tables, the data presented may be outside the specified
operating range (e.g., outside specified power supply range) and therefore outside the warranted range.
3.5
3
2.5
2
1.5
1
0.5
0
-0.5
-1
-1.5
-2
-2.5
-3
-3.5
0.3
Upper Specification Limit
Shutdown Current (µA)
Temperature Error (°C)
Note: Unless otherwise indicated, all parameters apply at V DD = 3.3V for the TC77-3.3MXX and VDD = 5.0V for the TC775.0MXX, and TA = -55°C to +125°C. The TC77-3.3MXX and TC77-5.0MXX will operate from a supply voltage of 2.7V
to 5.5V. However, the temperature accuracy of the TC77-3.3MXX and TC77-5.0MXX is specified at the nominal operating voltages of 3.3V and 5.0V, respectively.
Mean
Mean + 3V
Mean - 3V
Lower Specification Limit
-55
-35
-15
5
25
45
65
0.2
0.1
0.0
85
-55
105 125
-25
Reference Temperature (°C)
FIGURE 2-1:
(TC77-XXMXX).
Accuracy vs. Temperature
230
220
TA = -55°C
210
TA = +125°C
2.7
3.1
3.5
3.9
4.3
4.7
5.1
FIGURE 2-4:
Temperature.
Power-On Reset Voltage (V)
Supply Current (µA)
TA = +25°C
200
1.5
1.0
0.5
0.0
-25
5
35
65
95
125
FIGURE 2-5:
Power-On Reset Voltage vs.
Temperature (TC77-XXMXX).
Temperature Change (°C)
Supply Current (µA)
TC77-5.0MXX
VDD = 5.0 V
250
TC77-3.3MXX
VDD = 3.3 V
100
125
2.0
0.4
150
95
Temperature (°C)
400
200
65
2.5
-55
5.5
FIGURE 2-2:
Supply Current vs. Supply
Voltage (TC77-XXMXX).
300
35
Shutdown Current vs.
Supply Voltage (V)
350
5
Temperature (°C)
250
240
TC77-5.0MXX
VDD = 5.0 V
TC77-3.3MXX
VDD = 3.3 V
50
0
TC77-3.3MXX
0.3
0.2
0.1
TA = +85°C
TA = +25°C
0
-0.1
TA = -25°C
-0.2
-0.3
-0.4
-55
-25
5
35
65
95
Temperature (°C)
FIGURE 2-3:
Temperature.
Supply Current vs.
 2002 Microchip Technology Inc.
125
3
3.1
3.2
3.3
3.4
3.5
3.6
Supply Voltage (V)
FIGURE 2-6:
Temperature Accuracy vs.
Supply Voltage (TC77-3.3MXX).
DS20092A-page 5
Temperature Change (°C)
0.4
Percentage of Occurances (%)
TC77
TC77-5.0MXX
0.3
0.2
TA = +25°C
0.1
0
TA = +85°C
-0.1
TA = -25°C
-0.2
-0.3
-0.4
4.5 4.6 4.7 4.8 4.9
5
50
Sample Size = 108
TA = +25°C
45
40
35
30
25
20
15
10
5
0
-1
5.1 5.2 5.3 5.4 5.5
-0.75
-0.5
Supply Voltage (V)
Sample Size = 108
TA = -55°C
30
25
20
15
10
5
0
-3 -2.5 -2 -1.5 -1 -0.5 0
0.5
1
1.5
2
2.5
3
50
45
40
30
25
20
15
10
5
0
-1.5
-1
-0.5
0
0.5
1
1.5
2
Temperature Error (°C)
FIGURE 2-9:
Histogram of Temperature
Accuracy at -40 Degrees C (TC77-XXMXX).
DS20092A-page 6
0.75
1
35
30
25
20
15
10
5
0
-1
-0.75
-0.5
-0.25
0
0.25
0.5
0.75
1
FIGURE 2-11:
Histogram of Temperature
Accuracy at +65 Degrees C (TC77-XXMXX).
Percentage of Occurances (%)
Percentage of Occurances (%)
Sample Size = 108
TA = -40°C
-2
0.5
Temperature Error (°C)
FIGURE 2-8:
Histogram of Temperature
Accuracy at -55 Degrees C (TC77-XXMXX).
35
0.25
Sample Size = 108
TA = +65°C
Temperature Error (°C)
40
0
FIGURE 2-10:
Histogram of Temperature
Accuracy at +25 Degrees C (TC77-XXMXX).
Percentage of Occurances (%)
Percentage of Occurances (%)
FIGURE 2-7:
Temperature Accuracy vs.
Supply Voltage (TC77-5.0MXX).
35
-0.25
Temperature Error (°C)
90
80
Sample Size = 108
TA = +85°C
70
60
50
40
30
20
10
0
-2
-1.5
-1
-0.5
0
0.5
1
1.5
2
Temperature Error (°C)
FIGURE 2-12:
Histogram of Temperature
Accuracy at +85 Degrees C (TC77-XXMXX).
 2002 Microchip Technology Inc.
Percentage of Occurances (%)
TC77
60
50
Sample Size = 108
TA = +125°C
40
30
20
10
0
-3 -2.5 -2 -1.5 -1 -0.5 0
0.5
1
1.5
2
2.5
3
Temperature Error (°C)
FIGURE 2-13:
Histogram of Temperature
Accuracy at +125 Degrees C (TC77-XXMXX).
 2002 Microchip Technology Inc.
DS20092A-page 7
TC77
3.0
FUNCTIONAL DESCRIPTION
The TC77 consists of a band-gap type temperature
sensor, a 12-bit plus sign (13-bit) Sigma-Delta Analogto-Digital Converter (ADC), an internal conversion
oscillator (~30 kHz) and a serial input/output port.
These devices feature a three-wire serial interface that
is fully compatible with SPI and MICROWIRE specifications and, therefore, allows simple communications
with common microcontrollers and processors. The
Shutdown mode can be used to reduce supply current
for power sensitive applications. A Manufacturer’s ID
register identifies the TC77 as a Microchip Technology
product.
Output
Code
0+0111 1101 0000
+25°C
+0.0625°C
0+0001 1001 0000
0+0000 0000 0001
Temp
0°C
0+0000 0000 0000
Temp
1+1111 1111 1111
-55°C
+125°C
1+1110 0111 0000
-0.0625°C
-25°C
1+1100 1001 0000
FIGURE 3-1:
DS20092A-page 8
Temperature To Digital Transfer Function (Non-linear Scale).
 2002 Microchip Technology Inc.
TC77
3.1
Temperature Data Format
3.3
A 13-bit two’s complement digital word is used to represent the temperature. The Least Significant Bit (LSb)
is equal to 0.0625°C. Note that the last two LSb bits (Bit
0 and 1) are tri-stated and are represented as a logic ‘1’
in the table. Bit 2 is set to logic ‘1’ after the completion
of the first temperature conversion following a powerup or voltage reset event.
TABLE 3-1:
Temperature
TC77 OUTPUT
Binary
MSB / LSB
Hex
+125°C
0011 1110 1000 0111 3E 87h
+25°C
0000 1100 1000 0111 0B 87h
+0.0625°C
0000 0000 0000 1111 00 0Fh
0°C
0000 0000 0000 0111 00 07h
-0.0625°C
1111 1111 1111 1111 FF FFh
-25°C
1111 0011 1000 0111 F3 87h
-55°C
1110 0100 1000 0111 E4 87h
An over-temperature condition can be determined by
reading only the first few Most Significant Bits (MSb) of
the temperature data. For example, the microprocessor could read only the first four bits of the Temperature
register in order to determine that an over-temperature
condition exists.
3.2
Power-Up And Power-Down
The TC77 is in the Continuous Temperature Conversion mode at power-up. The first valid temperature conversion will be available approximately 300 ms (refer to
“Temperature to Bits Converter” section listed in the DC
characteristics table) after power-up. Bit 2 of the Temperature register is set to a logic ‘1’ after the completion
of the first temperature conversion following a powerup or voltage reset event. Bit 2 is set to logic ‘0’ during
the time needed to complete the first temperature conversion. Thus, the status of bit 2 can be monitored to
indicate the completion of the first temperature conversion.
A supply voltage lower than 1.6V (typ.) is considered a
power-down state for the TC77. The device will reset
itself and continue its normal Continuous Conversion
mode of operation when the supply voltage rises above
the nominal 1.6V. A minimal supply voltage of 2.7V is
required in order to ensure proper operation of the
device.
 2002 Microchip Technology Inc.
Serial Bus Interface
The serial interface consists of the Chip Select (CS),
Serial Clock (SCK) and Serial Data (SI/O) signals. The
TC77 meets the SPI and MICROWIRE bus specifications, with the serial interface designed to be compatible with the Microchip PICmicro® family of
microcontrollers.
The CS input is used to select the TC77 when multiple
devices are connected to the serial clock and data
lines. The CS line is also used to synchronize the data,
which is written to, or read from, the device when CS is
equal to a logic ‘0’ voltage. The SCK input is disabled
when CS is a logic ‘1’. The falling edge of the CS line
initiates communication, while the rising edge of CS
completes the communication.
The SCK input is provided by the external microcontroller and is used to synchronize the data on the SI/O line.
The Temperature and Manufacturer ID registers are
read only while the Configuration register is a read/
write register.
Figure 3-2 provides a timing diagram of a read operation of the Temperature register. Communication with
the TC77 is initiated when the CS goes to a logic ‘0’.
The Serial I/O signal (SI/O) then transmits the first bit of
data. The microcontroller serial I/O bus master clocks
the data in on the rising edge of SCK. The falling edge
of SCK is then used to clock out the rest of the data.
After 14 bits of data (thirteen temperature bits and Bit 2)
have been transmitted, the SI/O line is then tri-stated.
Note that CS can be taken to a logic ‘1’ at any time during the data transmission if only a portion of the temperature data information is required. The TC77 will
complete the conversion, and the output shift register
will be updated, if CS goes to the inactive state while in
the middle of a conversion.
Figure 3-3 provides a timing diagram of a multi-byte
communication operation consisting of a read of the
Temperature Data register, followed by a write to the
Configuration register. The first 16 SCK pulses are
used to transmit the TC77's temperature data to the
microcontroller. The second group of 16 SCK pulses
are used to receive the microcontroller command to
place the TC77 either in Shutdown or Continuous Temperature Conversion mode. Note that the TC77 is in the
Continuous Temperature Conversion mode at powerup.
The data written to the TC77’s Configuration register
should be either all 0’s or all 1’s, corresponding to
either the Continuous Temperature Conversion or
Shutdown mode, respectively. The TC77 is in Shutdown mode when Bits C0 to C7 are all equal to 1’s. The
TC77 will be in the Continuous Conversion mode if a ‘0’
in any bit location from C0 to C7 is written to the
Configuration register.
DS20092A-page 9
TC77
CS
tCS-SCK
CLK
1
SI/O
HI-Z
8
T
12
T
11
T
9
T
10
T
8
T
7
T
6
13
T
5
T
4
T
3
T
2
T
1
HI-Z
T
0
FIGURE 3-2:
Temperature Read Timing Diagram - (Reading only the first 13 Bits of the
Temperature Register).
CS
tCS-SCK
CLK
1
SI/O HI-Z
T
12
8
T T
11 10
T
9
T
8
T
7
T
6
T
5
1
T
4
8
T
3
T
2
T
1
T BIT
0 2
HI-Z
8
1
C C C C C C
15 14 13 12 11 10
C
9
C
8
C
7
C
6
TEMPERATURE REGISTER
Notes:
CONFIGURATION REGISTER
Notes:
1.
1.
2.
2.
3.
Bit 2 = 0 during power-up for the first
temperature conversion.
Bit 2 =1 after the completion of the first temperature conversion following power-up or a
reset event.
Bits 1 and 0 are “DON”T CARES”.
FIGURE 3-3:
Diagram.
8
1
C
5
C
4
C
3
C
2
C
1
C
0
HI-Z
XX00 = Continuous Conversion Mode
XXFF = Shutdown Mode
Temperature Read Followed By A Write To The Configuration Register Timing.
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.
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.
00 hex
01 hex
03 hex
07 hex
0F hex
1F hex
3F hex
7F hex
FF hex
3.
4.
5.
6.
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 Configuration register to enter Shutdown mode.
Read the 16 bits from the Manufacturer's ID register (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.
The time between a complete temperature conversion
and data transmission is approximately 300 msec.
DS20092A-page 10
 2002 Microchip Technology Inc.
TC77
4.0
INTERNAL REGISTER
STRUCTURE
The TC77 Internal register structure consists of three
registers. The Temperature and Manufacturer’s Identification registers are read only, while the Configuration
register is write only.
TABLE 4-1:
REGISTERS FOR TC77
Name
Bit
15
Bit
14
Bit
13
Bit
12
Bit
11
Bit
10
Bit
9
Bit
8
Bit
7
Bit
6
Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
Value at Powerup/Reset
CONFIG
C15
C14
C13
C12
C11
C10
C9
C8
C7
C6
C5
C4
C3
C2
C1
C0
XXXX/XXXX 0000/0000
TEMP
T12
T11
T10
T9
T8
T7
T6
T5
T4
T3
T2
T1
T0
*
x
x
1111/1111 0000/0*XX
M_ID
0
1
0
1
0
1
0
0
0
0
0
0
0
0
x
x
0101/0100 0000/00XX
* Bit 2 = 0 during power-up; otherwise, bit 2 =1
4.1
Configuration Register (CONFIG)
The Configuration register is write only. This register
selects either Shutdown, Continuous Conversion or
Test modes:
• C15:C0 = XXXX/XXXX 1111/1111 (Shutdown
mode)
• C15:C0 = XXXX/XXXX 0000/0000 (Continuous
Conversion mode)
• The TC77 is in Shutdown mode when bits C0 to
C7 are all equal to ‘1’s. The TC77 will be in the
Continuous Conversion mode if a ‘0’ in any bit
location from C0 to C7 is written to the Configuration register. The TC77 is in the Continuous
Conversion mode at power-up.
It is recommended that the user write all ‘0’s or all ‘1’s
to the Configuration register because other bit codes
may put the TC77 in a test mode used for calibration
and production verification tests. Section 3.3 lists the
Configuration register bit codes that can be written to
the TC77 without having the device enter a production
test mode.
During Shutdown mode, the serial bus is still active.
The current consumption of the TC77 will be less than
1 µA during the time between serial communication.
 2002 Microchip Technology Inc.
4.2
Temperature Register (TEMP)
The Temperature register is read only and holds the
temperature conversion data. Bits 0 and 1 are undefined and will be tri-state outputs during a read
sequence. Bit 2 is set to a logic ‘1’ after completion of
the first temperature conversion following a power-up
or reset event. Bit 2 is set to a logic ‘0’ during the time
needed to complete the first temperature conversion.
Therefore, the status of bit 2 can be monitored to indicate that the TC77 has completed the first temperature
conversion. Bits 15:3 contain the 13 bit two’s complement data from the temperature conversion.
4.3
Manufacturer’s ID Register (M_ID)
The Manufacturer’s Identification code is contained in
this read only register. The Manufacturer ID register is
only available for a read operation when the TC77 is in
Shutdown mode. The Manufacturer’s ID code is contained in bits 15:8 and is equal to 54 hex to indicate a
Microchip device. Bits 1:0 are undefined and will be tristate outputs during a read sequence, while bits 7:2 are
set to ‘0’.
DS20092A-page 11
TC77
5.0
APPLICATION INFORMATION
The TC77 does not require any additional components
in order to measure temperature. However, it is recommended that a decoupling capacitor of 0.1 µF to 1 µF
be provided between the VDD and VSS (Ground) pins (a
high frequency ceramic capacitor should be used). It is
necessary for the capacitor to be located as close as
possible to the integrated circuit (IC) power pins in
order to provide effective noise protection to the TC77.
The TC77 measures temperature by monitoring the
voltage of a diode located on the IC die. A low-impedance thermal path between the die and the printed circuit board (PCB) is provided by the IC pins of the TC77.
Therefore, the TC77 effectively monitors the temperature of the PCB board. The thermal path between the
ambient air is not as efficient because the plastic IC
housing package functions as a thermal insulator.
Thus, the ambient air temperature (assuming that a
large temperature gradient exists between the air and
PCB) has only a small effect on the temperature
measured by the TC77.
A potential for self-heating errors can exist if the TC77
SPI communication lines are heavily loaded. Typically,
the self-heating error is negligible because of the relatively small current consumption of the TC77. A temperature accuracy error of approximately 0.5°C will
result from self-heating if the SPI communication pins
sink/source the maximum current specified for the
TC77. Therefore, to maximize the temperature accuracy, the output loading of the SPI signals should be
minimized.
DS20092A-page 12
 2002 Microchip Technology Inc.
TC77
6.0
PACKAGING INFORMATION
6.1
Package Marking Information
Example:
5-Lead SOT-23
TC77-3.3MCTTR = CN
XXNN
TC77-5.0MCTTR = CP
8-Lead SOIC (150 mil)
XXXXXXXX
XXXXYYWW
NNN
Legend:
Note:
*
XX...X
Y
YY
WW
NNN
CP57
Example:
TC77-33
I/SN0222
057
Customer specific information*
Year code (last digit of calendar year)
Year code (last 2 digits of calendar year)
Week code (week of January 1 is week ‘01’)
Alphanumeric traceability code
In the event the full Microchip part number cannot be marked on one line, it will
be carried over to the next line thus limiting the number of available characters
for customer specific information.
Standard marking consists of Microchip part number, year code, week code, and traceability code.
Please check with your Microchip Sales Office.
 2002 Microchip Technology Inc.
DS20092A-page 13
TC77
5-Lead Plastic Small Outline Transistor (OT) (SOT23)
E
E1
p
B
p1
n
D
1
α
c
A
Units
Dimension Limits
n
Number of Pins
p
Pitch
p1
Outside lead pitch (basic)
Overall Height
Molded Package Thickness
Standoff §
Overall Width
Molded Package Width
Overall Length
Foot Length
Foot Angle
Lead Thickness
Lead Width
Mold Draft Angle Top
Mold Draft Angle Bottom
* Controlling Parameter
§ Significant Characteristic
φ
L
β
A
A2
A1
E
E1
D
L
φ
c
B
α
β
MIN
.035
.035
.000
.102
.059
.110
.014
0
.004
.014
0
0
A2
A1
INCHES*
NOM
5
.038
.075
.046
.043
.003
.110
.064
.116
.018
5
.006
.017
5
5
MAX
.057
.051
.006
.118
.069
.122
.022
10
.008
.020
10
10
MILLIMETERS
NOM
5
0.95
1.90
0.90
1.18
0.90
1.10
0.00
0.08
2.60
2.80
1.50
1.63
2.80
2.95
0.35
0.45
0
5
0.09
0.15
0.35
0.43
0
5
0
5
MIN
MAX
1.45
1.30
0.15
3.00
1.75
3.10
0.55
10
0.20
0.50
10
10
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MO-178
Drawing No. C04-091
DS20092A-page 14
 2002 Microchip Technology Inc.
TC77
8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC)
E
E1
p
D
2
B
n
1
h
α
45°
c
A2
A
φ
β
L
Units
Dimension Limits
n
p
Number of Pins
Pitch
Overall Height
Molded Package Thickness
Standoff §
Overall Width
Molded Package Width
Overall Length
Chamfer Distance
Foot Length
Foot Angle
Lead Thickness
Lead Width
Mold Draft Angle Top
Mold Draft Angle Bottom
* Controlling Parameter
§ Significant Characteristic
A
A2
A1
E
E1
D
h
L
φ
c
B
α
β
MIN
.053
.052
.004
.228
.146
.189
.010
.019
0
.008
.013
0
0
A1
INCHES*
NOM
8
.050
.061
.056
.007
.237
.154
.193
.015
.025
4
.009
.017
12
12
MAX
.069
.061
.010
.244
.157
.197
.020
.030
8
.010
.020
15
15
MILLIMETERS
NOM
8
1.27
1.35
1.55
1.32
1.42
0.10
0.18
5.79
6.02
3.71
3.91
4.80
4.90
0.25
0.38
0.48
0.62
0
4
0.20
0.23
0.33
0.42
0
12
0
12
MIN
MAX
1.75
1.55
0.25
6.20
3.99
5.00
0.51
0.76
8
0.25
0.51
15
15
Notes:
Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions shall not exceed
.010” (0.254mm) per side.
JEDEC Equivalent: MS-012
Drawing No. C04-057
 2002 Microchip Technology Inc.
DS20092A-page 15
TC77
NOTES:
DS20092A-page 16
 2002 Microchip Technology Inc.
TC77
ON-LINE SUPPORT
Microchip provides on-line support on the Microchip
World Wide Web site.
The web site is used by Microchip as a means to make
files and information easily available to customers. To
view the site, the user must have access to the Internet
and a web browser, such as Netscape® or Microsoft®
Internet Explorer. Files are also available for FTP
download from our FTP site.
Connecting to the Microchip Internet Web Site
The Microchip web site is available at the following
URL:
www.microchip.com
SYSTEMS INFORMATION AND
UPGRADE HOT LINE
The Systems Information and Upgrade Line provides
system users a listing of the latest versions of all of
Microchip's development systems software products.
Plus, this line provides information on how customers
can receive the most current upgrade kits.The Hot Line
Numbers are:
1-800-755-2345 for U.S. and most of Canada, and
1-480-792-7302 for the rest of the world.
092002
The file transfer site is available by using an FTP service to connect to:
ftp://ftp.microchip.com
The web site and file transfer site provide a variety of
services. Users may download files for the latest
Development Tools, Data Sheets, Application Notes,
User's Guides, Articles and Sample Programs. A variety of Microchip specific business information is also
available, including listings of Microchip sales offices,
distributors and factory representatives. Other data
available for consideration is:
• Latest Microchip Press Releases
• Technical Support Section with Frequently Asked
Questions
• Design Tips
• Device Errata
• Job Postings
• Microchip Consultant Program Member Listing
• Links to other useful web sites related to
Microchip Products
• Conferences for products, Development Systems,
technical information and more
• Listing of seminars and events
 2002 Microchip Technology Inc.
DS20092A-page 17
TC77
READER RESPONSE
It is our intention to provide you with the best documentation possible to ensure successful use of your Microchip product. If you wish to provide your comments on organization, clarity, subject matter, and ways in which our documentation
can better serve you, please FAX your comments to the Technical Publications Manager at (480) 792-4150.
Please list the following information, and use this outline to provide us with your comments about this document.
To:
Technical Publications Manager
RE:
Reader Response
Total Pages Sent ________
From: Name
Company
Address
City / State / ZIP / Country
Telephone: (_______) _________ - _________
FAX: (______) _________ - _________
Application (optional):
Would you like a reply?
Device: TC77
Y
N
Literature Number: DS20092A
Questions:
1. What are the best features of this document?
2. How does this document meet your hardware and software development needs?
3. Do you find the organization of this document easy to follow? If not, why?
4. What additions to the document do you think would enhance the structure and subject?
5. What deletions from the document could be made without affecting the overall usefulness?
6. Is there any incorrect or misleading information (what and where)?
7. How would you improve this document?
DS20092A-page 18
 2002 Microchip Technology Inc.
TC77
PRODUCT IDENTIFICATION SYSTEM
To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office.
PART NO.
-X.X
X
XX
Device
Supply
Voltage
Temperature
Range
Package
Device:
TC77:
Supply Voltage:
3.3 = VDD = Accuracy optimized for 3.3V
5.0 = VDD = Accuracy optimized for 5.0V
=
Thermal Sensor with SPI Interface
Temperature Range:
M
-55°C to +125°C
Package:
CTTR = Plastic Small Outline Transistor (SOT-23),
5-lead (Tape and Reel only)
OA
= Plastic SOIC, (150 mil Body), 8-lead
Examples:
a)
TC77-3.3MOA: 3.3V Thermal Sensor in
SOIC package.
b)
TC77-5.0MOA: 5.0V Thermal Sensor in
SOIC package.
c)
TC77-3.3MOATR: 3.3V Thermal Sensor in
SOIC package, Tape and Reel.
d)
TC77-5.0MOATR: 5.0V Thermal Sensor in
SOIC package, Tape and Reel.
e)
TC77-3.3MCTTR: 3.3V Thermal Sensor in
SOT-23 package, Tape and Reel.
f)
TC77-5.0MCTTR: 5.0V Thermal Sensor in
SOT-23 package, Tape and Reel.
Sales and Support
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recommended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1.
2.
3.
Your local Microchip sales office
The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
 2002 Microchip Technology Inc.
DS20092A-page19
TC77
NOTES:
DS20092A-page 20
 2002 Microchip Technology Inc.
Information contained in this publication regarding device
applications and the like is intended through suggestion only
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
No representation or warranty is given and no liability is
assumed by Microchip Technology Incorporated with respect
to the accuracy or use of such information, or infringement of
patents or other intellectual property rights arising from such
use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with
express written approval by Microchip. No licenses are conveyed, implicitly or otherwise, under any intellectual property
rights.
Trademarks
The Microchip name and logo, the Microchip logo, K EELOQ,
MPLAB, PIC, PICmicro, PICSTART and PRO MATE are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
FilterLab, microID, MXDEV, MXLAB, PICMASTER, SEEVAL
and The Embedded Control Solutions Company are
registered trademarks of Microchip Technology Incorporated
in the U.S.A.
dsPIC, dsPICDEM.net, ECONOMONITOR, FanSense,
FlexROM, fuzzyLAB, In-Circuit Serial Programming, ICSP,
ICEPIC, microPort, Migratable Memory, MPASM, MPLIB,
MPLINK, MPSIM, PICC, PICDEM, PICDEM.net, rfPIC, Select
Mode and Total Endurance are trademarks of Microchip
Technology Incorporated in the U.S.A. and other countries.
Serialized Quick Turn Programming (SQTP) is a service mark
of Microchip Technology Incorporated in the U.S.A.
All other trademarks mentioned herein are property of their
respective companies.
© 2002, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received QS-9000 quality system
certification for its worldwide headquarters,
design and wafer fabrication facilities in
Chandler and Tempe, Arizona in July 1999
and Mountain View, California in March 2002.
The Company’s quality system processes and
procedures are QS-9000 compliant for its
PICmicro® 8-bit MCUs, KEELOQ® code hopping
devices, Serial EEPROMs, microperipherals,
non-volatile memory and analog products. In
addition, Microchip’s quality system for the
design and manufacture of development
systems is ISO 9001 certified.
 2002 Microchip Technology Inc.
DS20092A - page 21
M
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
Corporate Office
Australia
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200 Fax: 480-792-7277
Technical Support: 480-792-7627
Web Address: http://www.microchip.com
Microchip Technology Australia Pty Ltd
Suite 22, 41 Rawson Street
Epping 2121, NSW
Australia
Tel: 61-2-9868-6733 Fax: 61-2-9868-6755
Rocky Mountain
China - Beijing
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7966 Fax: 480-792-4338
Microchip Technology Consulting (Shanghai)
Co., Ltd., Beijing Liaison Office
Unit 915
Bei Hai Wan Tai Bldg.
No. 6 Chaoyangmen Beidajie
Beijing, 100027, No. China
Tel: 86-10-85282100 Fax: 86-10-85282104
Atlanta
500 Sugar Mill Road, Suite 200B
Atlanta, GA 30350
Tel: 770-640-0034 Fax: 770-640-0307
Boston
2 Lan Drive, Suite 120
Westford, MA 01886
Tel: 978-692-3848 Fax: 978-692-3821
Chicago
333 Pierce Road, Suite 180
Itasca, IL 60143
Tel: 630-285-0071 Fax: 630-285-0075
Dallas
4570 Westgrove Drive, Suite 160
Addison, TX 75001
Tel: 972-818-7423 Fax: 972-818-2924
Detroit
Tri-Atria Office Building
32255 Northwestern Highway, Suite 190
Farmington Hills, MI 48334
Tel: 248-538-2250 Fax: 248-538-2260
Kokomo
2767 S. Albright Road
Kokomo, Indiana 46902
Tel: 765-864-8360 Fax: 765-864-8387
Los Angeles
18201 Von Karman, Suite 1090
Irvine, CA 92612
Tel: 949-263-1888 Fax: 949-263-1338
China - Chengdu
Microchip Technology Consulting (Shanghai)
Co., Ltd., Chengdu Liaison Office
Rm. 2401, 24th Floor,
Ming Xing Financial Tower
No. 88 TIDU Street
Chengdu 610016, China
Tel: 86-28-86766200 Fax: 86-28-86766599
China - Fuzhou
Microchip Technology Consulting (Shanghai)
Co., Ltd., Fuzhou Liaison Office
Unit 28F, World Trade Plaza
No. 71 Wusi Road
Fuzhou 350001, China
Tel: 86-591-7503506 Fax: 86-591-7503521
China - Shanghai
Microchip Technology Consulting (Shanghai)
Co., Ltd.
Room 701, Bldg. B
Far East International Plaza
No. 317 Xian Xia Road
Shanghai, 200051
Tel: 86-21-6275-5700 Fax: 86-21-6275-5060
China - Shenzhen
150 Motor Parkway, Suite 202
Hauppauge, NY 11788
Tel: 631-273-5305 Fax: 631-273-5335
Microchip Technology Consulting (Shanghai)
Co., Ltd., Shenzhen Liaison Office
Rm. 1315, 13/F, Shenzhen Kerry Centre,
Renminnan Lu
Shenzhen 518001, China
Tel: 86-755-2350361 Fax: 86-755-2366086
San Jose
China - Hong Kong SAR
Microchip Technology Inc.
2107 North First Street, Suite 590
San Jose, CA 95131
Tel: 408-436-7950 Fax: 408-436-7955
Microchip Technology Hongkong Ltd.
Unit 901-6, Tower 2, Metroplaza
223 Hing Fong Road
Kwai Fong, N.T., Hong Kong
Tel: 852-2401-1200 Fax: 852-2401-3431
New York
Toronto
6285 Northam Drive, Suite 108
Mississauga, Ontario L4V 1X5, Canada
Tel: 905-673-0699 Fax: 905-673-6509
India
Microchip Technology Inc.
India Liaison Office
Divyasree Chambers
1 Floor, Wing A (A3/A4)
No. 11, O’Shaugnessey Road
Bangalore, 560 025, India
Tel: 91-80-2290061 Fax: 91-80-2290062
Japan
Microchip Technology Japan K.K.
Benex S-1 6F
3-18-20, Shinyokohama
Kohoku-Ku, Yokohama-shi
Kanagawa, 222-0033, Japan
Tel: 81-45-471- 6166 Fax: 81-45-471-6122
Korea
Microchip Technology Korea
168-1, Youngbo Bldg. 3 Floor
Samsung-Dong, Kangnam-Ku
Seoul, Korea 135-882
Tel: 82-2-554-7200 Fax: 82-2-558-5934
Singapore
Microchip Technology Singapore Pte Ltd.
200 Middle Road
#07-02 Prime Centre
Singapore, 188980
Tel: 65-6334-8870 Fax: 65-6334-8850
Taiwan
Microchip Technology (Barbados) Inc.,
Taiwan Branch
11F-3, No. 207
Tung Hua North Road
Taipei, 105, Taiwan
Tel: 886-2-2717-7175 Fax: 886-2-2545-0139
EUROPE
Austria
Microchip Technology Austria GmbH
Durisolstrasse 2
A-4600 Wels
Austria
Tel: 43-7242-2244-399
Fax: 43-7242-2244-393
Denmark
Microchip Technology Nordic ApS
Regus Business Centre
Lautrup hoj 1-3
Ballerup DK-2750 Denmark
Tel: 45 4420 9895 Fax: 45 4420 9910
France
Microchip Technology SARL
Parc d’Activite du Moulin de Massy
43 Rue du Saule Trapu
Batiment A - ler Etage
91300 Massy, France
Tel: 33-1-69-53-63-20 Fax: 33-1-69-30-90-79
Germany
Microchip Technology GmbH
Steinheilstrasse 10
D-85737 Ismaning, Germany
Tel: 49-89-627-144 0 Fax: 49-89-627-144-44
Italy
Microchip Technology SRL
Centro Direzionale Colleoni
Palazzo Taurus 1 V. Le Colleoni 1
20041 Agrate Brianza
Milan, Italy
Tel: 39-039-65791-1 Fax: 39-039-6899883
United Kingdom
Microchip Ltd.
505 Eskdale Road
Winnersh Triangle
Wokingham
Berkshire, England RG41 5TU
Tel: 44 118 921 5869 Fax: 44-118 921-5820
08/01/02
DS20092A-page 22
 2002 Microchip Technology Inc.