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PDF TC77 Data sheet ( Hoja de datos )
| Número de pieza | TC77 | |
| Descripción | Thermal Sensor with SPI Interface | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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M
TC77
Thermal Sensor with SPI™ Interface
Features
• 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
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
Block Diagram
VDD
Internal
Diode
Temperature
Sensor
TC77
13-Bit
Sigma Delta
A/D Converter
Temperature
Register
VSS
Manufacturer
ID Register
Serial
Port
Interface
Configuration
Register
CS
SI/O
SCK
Description
The TC77 is a serially accessible digital temperature
sensor particularly suited for low cost and small form-
factor applications. Temperature data is converted from
the internal thermal sensing element and made avail-
able 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 tem-
perature accuracy of ±1.0°C (max.) over the tempera-
ture range of +25°C to +65°C. When operating, the
TC77 consumes only 250 µA (typ.). The TC77’s Con-
figuration register can be used to activate the low
power Shutdown mode, which has a current consump-
tion 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.
Package Types
SOT-23-5
CS
VSS
SCK
1
TC77
VDD
SI/O
SI/O
SCK
NC
VSS
SOIC
1
TC77
VDD
CS
NC
NC
Typical Application
VDD
0.1µF
VDD
TC77
PICmicro®
MCU
CS
SCK
SI/O
VSS
AN0
SCK
SDI
2002 Microchip Technology Inc.
DS20092A-page 1
1 page  
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.
Note: Unless otherwise indicated, all parameters apply at VDD = 3.3V for the TC77-3.3MXX and VDD = 5.0V for the TC77-
5.0MXX, 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 oper-
ating voltages of 3.3V and 5.0V, respectively.
3.5
3
2.5
Upper Specification Limit
2
1.5 Mean
1 Mean + 3V
0.5
0
-0.5
-1
-1.5 Mean - 3V
-2
-2.5
-3
Lower Specification Limit
-3.5
-55 -35 -15 5 25 45 65 85 105
125
Reference Temperature (°C)
FIGURE 2-1:
Accuracy vs. Temperature
(TC77-XXMXX).
0.3
0.2
TC77-5.0MXX
TC77-3.3MXX
VDD = 5.0 V
0.1 VDD = 3.3 V
0.0
-55
-25
FIGURE 2-4:
Temperature.
5 35 65
Temperature (°C)
95 125
Shutdown Current vs.
250
240 TA = +25°C
230
220
210
200
2.7
TA = -55°C
TA = +125°C
3.1 3.5 3.9 4.3 4.7 5.1
Supply Voltage (V)
5.5
FIGURE 2-2:
Supply Current vs. Supply
Voltage (TC77-XXMXX).
400
350 TC77-5.0MXX
300 VDD = 5.0 V
250
200
TC77-3.3MXX
150 VDD = 3.3 V
100
50
0
-55 -25 5 35 65 95 125
Temperature (°C)
FIGURE 2-3:
Temperature.
Supply Current vs.
2.5
2.0
1.5
1.0
0.5
0.0
-55
-25
5 35 65
Temperature (°C)
95 125
FIGURE 2-5:
Power-On Reset Voltage vs.
Temperature (TC77-XXMXX).
0.4
0.3 TC77-3.3MXX
0.2
0.1 TA = +85°C
0
TA = +25°C
-0.1
-0.2 TA = -25°C
-0.3
-0.4
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).
2002 Microchip Technology Inc.
DS20092A-page 5
5 Page 
TC77
4.0 INTERNAL REGISTER
STRUCTURE
The TC77 Internal register structure consists of three
registers. The Temperature and Manufacturer’s Identi-
fication 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 Configura-
tion 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.
4.2 Temperature Register (TEMP)
The Temperature register is read only and holds the
temperature conversion data. Bits 0 and 1 are unde-
fined 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 indi-
cate that the TC77 has completed the first temperature
conversion. Bits 15:3 contain the 13 bit two’s comple-
ment 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 con-
tained in bits 15:8 and is equal to 54 hex to indicate a
Microchip device. Bits 1:0 are undefined and will be tri-
state outputs during a read sequence, while bits 7:2 are
set to ‘0’.
2002 Microchip Technology Inc.
DS20092A-page 11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet TC77.PDF ] | |
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