MICROCHIP TC72 Technical data

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M
Digital Temperature Sensor with SPI™ Interfa
Features
• Temperature-to-Digital Converter
• SPI™ Compatible Interface
• 10-Bit Resolution (0.25°C/Bit)
• ±2°C (max.) Accuracy from -40°C to +85°C
• 2.65V to 5.5V Operating Range
• Low Power Consumption:
- 250 µA (typ.) Continuous Temperature Conversion Mode
- 1 µA (max.) Shutdown Mode
• Power Saving One-Shot Temperature Measurement
• Industry Standard 8-Pin MSOP Package
• Space Saving 8-Pin DFN (3x3 mm) Package
Typical Applications
• Personal Computers and Servers
• Hard Disk Drives and Other PC Peripherals
• Entertainment Systems
• Office Equipment
• Datacom Equipment
• Mobile Phones
• General Purpose Temperature Monitoring
Package Types
MSOP
1
DFN
NC
SCK
CE
GND
NC
CE
SCK
GND
1
2
3
4
TC72
2
3
4
TC72
8
7
6
5
V
DD
NC
SDI
SDO
8
7
6
5SDI
V
DD
NC
SDO
TC72
ce
General Description
The TC72 is a digital temperature sensor capable of reading temperatures from -55°C to +125°C. This sen­sor features a serial interface that allows communica­tion with a host controller or other peripherals. The TC72 interface is compatible with the SPI protocol. The TC72 does not require any additional external compo­nents. However, it is recommended that a decoupling capacitor of 0.01 µF to 0.1 µF be provided between the V
and GND pins.
DD
The TC72 can be used either in a Continuous Temper­ature Conversion mode or a One-Shot Conversion mode. The Continuous Conversion mode measures the temperature approximately every 150 ms and stores the data in the temperature registers. In con­trast, the One-Shot mode performs a single tempera­ture measurement and returns to the power saving shutdown mode.
The TC72 features high temperature accuracy, ease­of-use and is the ideal solution for implementing ther­mal management in a variety of systems. The device is available in both 8-pin MSOP and 8-pin DFN space­saving packages. The TC72 also features a shutdown mode for low power operation.
Block Diagram
V
DD
Internal
Diode
Temperature
Sensor
10-Bit
Sigma Delta
A/D Converter
Temperature
Register
GND
TC72
Manufacturer ID Register
Serial
Port
Interface
Control
Register
CE SCK
SDO SDI
2002 Microchip Technology Inc. DS21743A-page 1
TC72
Typical Application
V
DD
0.1µF
V
DD
TC72
PICmicro
MCU
®
SDO
GND
CE
SCK
AN0
SCK
SDI
SDOSDI
DS21743A-page 2 2002 Microchip Technology Inc.
TC72
1.0 ELECTRICAL
CHARACTERISTICS
1.1 Maximum Ratings
VDD........................................................................ 6.0V
All inputs and outputs w.r.t. GND ...-0.3V to V
Storage temperature .......................... -65°C to +150°C
Ambient temp. with power applied ..... -55°C to +125°C
Junction Temperature ........................................ 150°C
ESD protection on all pins:
Human Body Model (HBM)............................. > 4 kV
Man Machine Model (MM).............................> 400V
Latch-Up Current at each pin ........................ ±200 mA
Maximum Power Dissipation........................... 250 mW
Notice: Stresses above t hose 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.
+0.3V
DD
DC CHARACTERISTICS
PIN FUNCTION TABLE
Name Function
NC No Internal Connection
CE Chip Enable Input, the device is selected
when this input is high
SCK Serial Clock Input
GND Ground
SDO Serial Data Output
SDI Serial Data Input
NC No Internal Connection
V
DD
Power Supply
Electrical Specifications: Unless otherwise noted, all parameters apply at VDD = 2.65V to 5.5V, TA = -55°C to +125 °C.
Parameters Sym Min Typ Max Units Conditions
Power Supply
Operating Voltage Range V
Operating Current:
Normal Mode, ADC Active
Shut-Down Supply Current I
Temperature Sensor and Analog-to-Digital Converter
Temperature Accuracy (Note 1)
Resolution 10 Bits Note 4
ADC Conversion Time t
Digital Input / Output
High Level Input Voltage V
Low Level Input Voltage V
High Level Output Voltage V
Low Level Output Voltage V
Input Resist ance R
Pin Capacitance C
Note 1: The TC72-2.8MXX, TC72-3.3MXX and TC72-5.0MXX will operate from a supply voltage of 2.65V to 5.5V. However, the
TC72-2.8MXX, TC72-3.3MXX and TC72-5.0MXX are tested and specified at the nominal operating voltages of 2.8V,
3.3V and 5.0V respectively. As V Figure 2-5 and Figure 2-6.
2: Measured with a load of C 3: All time measurements are measured with respect to the 50% point of the signal, except for the SCK rise and fall times.
The rise and fall times are defined as the 10% to 90% transition time.
4: Resolution = Temperature Range/No. of Bits = (+127°C – -128°C) / (2
DD
I
DD-CON
SHD
T
ACY
CONV
IH
IL
OH
OL
IN
IN
C
OUT
= 50 pF on the SDO output pin of the TC72.
L
2.65 5.5 V Note 1
250 400 µA Continuous temp. conversion mode
(Shutdown Bit = ‘0’)
0.1 1.0 µA Shutdown Mode (Shutdown Bit = ‘1’)
-2.0 +2.0 °C -40°C < TA < +85°C
-3.0 +3.0 -55°C < T
—150200ms
0.7 V
0.2 V
0.7 V
0.2 V
1.0 M
—15—pF
—50—
varies from the nominal operating value, the accuracy may be degraded. Refer to
DD
——V
DD
DD
——VIOH = 1 mA
DD
DD
10
) = 256/1024 = 0.25°C/Bit
V
VIOL = 4 mA
< +125°C
A
2002 Microchip Technology Inc. DS21743A-page 3
TC72
DC CHARACTERISTICS (CONTINUED)
Electrical Specifications: Unless otherwise noted, all parameters apply at VDD = 2.65V to 5.5V, TA = -55°C to +125 °C.
Parameters Sym Min Typ Max Units Conditions
Serial Port AC Timing (Note 2, 3)
Clock Frequency f
SCK Low Time t
SCK High Time t
CE to SCK Setup t
SCK to Data Out Valid t
CE to Output Tri-state t
SCK to Data Hold Time t
Data to SCK Set-up Time t
SCK to CE Hold Time t
SCK Rise Time t
SCK Fall Time t
CE Inactive Time t
CLK
CL
CH
CC
CDD
CDZ
CDH
DC
CCH
R
F
CWH
Thermal Package Resistance
Thermal Resistance, MSOP-8 θ Thermal Resistance, DFN-8 θ
JA
JA
Note 1: The TC72-2.8MXX, TC72-3.3MXX and TC72-5.0MXX will operate from a supply voltage of 2.65V to 5.5V. However, the
TC72-2.8MXX, TC72-3.3MXX and TC72-5.0MXX are tested and specified at the nominal operating voltages of 2.8V,
3.3V and 5.0V respectively. As V Figure 2-5 and Figure 2-6.
2: Measured with a load of C 3: All time measurements are measured with respect to the 50% point of the signal, except for the SCK rise and fall times.
= 50 pF on the SDO output pin of the TC72.
L
The rise and fall times are defined as the 10% to 90% transition time.
4: Resolution = Temperature Range/No. of Bits = (+127°C – -128°C) / (2
DC 7.5 MHz
65 ns
65 ns
400 ns
55 ns
40 ns
35 ns
35 ns
100 ns
——200ns
——200ns
400 ns
—206—°C/W
—60.5—°C/W
varies from the nominal operating value, the accuracy may be degraded. Refer to
DD
10
) = 256/1024 = 0.25°C/Bit
DS21743A-page 4 2002 Microchip Technology Inc.
SPI READ DATA TRANSFER
(CP = 0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7 = 0)
CE
1/f
t
CC
CLK
SCK
t
CCH
t
CWH
TC72
SDI
SDO
t
DC
A7
HIGH Z
t
CDH
MSb
t
t
R
F
A0
LSb
t
t
CH
CDD
D7
t
CL
MSb
SPI WRITE DATA TRANSFER
(CP = 0, data shifted on rising edge of SCK, data clocked on falling edge of SCK, A7 = 1)
CE
1/f
t
CC
CLK
SCK
t
t
R
F
t
t
DC
CDH
t
t
CL
CH
t
CCH
D0
t
CWH
LSb
t
CDZ
HIGH Z
SDI
A7 = 1
Note:
MSb LSb MSb LSb
The timing diagram is drawn with CP = 0. The
A0
D7 D0
TC72
also functions with CP = 1;
however, the edges of SCK are reversed as defined in Table 3-3 and Figure 3-2.
FIGURE 1-1: Serial Port Timing Diagrams.
2002 Microchip Technology Inc. DS21743A-page 5
TC72
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 V
3.5 3
2.5 2
1.5
Mean
1
0.5 0
-0.5
-1
-1.5
-2
-2.5
Temperature Error (°C)
-3
-3.5
-55 -25 5 35 65 95 125
Upper Specification Limit
Mean + 3V
Mean - 3V
Lower Specification Limit
Reference Temperature (°C)
FIGURE 2-1: Accuracy vs. Temperature (TC72-X.XMXX).
260
TC72-X.XMXX
250
TA = +25°C
240
230
220
210
Supply Current (µA)
200
2.5 3.0 3.5 4.0 4.5 5.0 5.5
TA = +125°C
TA = -55°C
Supply Voltage (V)
= 2.65V to 5.5V, TA = -55°C to +125°C.
DD
0.20
0.15 TC72-5.0MXX
= 5.0V
V
DD
0.10
0.05
Shutdown Current (µA)
0.00
-55 -25 5 35 65 95 125
TC72-5.0MXX V
DD
Temperature (°C)
= 2.8V
TC72-3.3MXX
= 3.3V
V
DD
FIGURE 2-4: Shutdown Current vs. Temperature.
0.4 TC72-2.8MXX
0.3
0.2
0.1
0.0
-0.1
-0.2
-0.3
Temperature Change (°C)
-0.4
2.6 2.7 2.8 2.9 3.0
T
A
TA = +25°C
= +85°C
TA = -25°C
Supply Voltage (V)
FIGURE 2-2: Supply Current vs. Supply Voltage.
400
350
TC72-5.0MXX
= 5.0V
V
DD
300
250
200
150
100
Supply Current (uA)
50
0
-55-255 356595125
TC72-2.8MXX
= 2.8V
V
DD
Temperature (°C)
TC72-3.3MXX
= 3.3V
V
DD
FIGURE 2-3: Supply Current vs. Temperature.
FIGURE 2-5: Temperature Accuracy vs. Supply Voltage (TC72-2.8MXX).
1.0 TC72-5.0MXX
0.8
0.6
0.4
0.2
TA = +85°C
0.0
-0.2
-0.4
-0.6
-0.8
Temperature Change (°C)
-1.0
4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5
TA = +25°C
TA = -25°C
Supply Voltage (V)
FIGURE 2-6: Temperature Accuracy vs. Supply Voltage (TC72-5.0MXX).
DS21743A-page 6 2002 Microchip Technology Inc.
TC72
Note: Unless otherwise indicated, all parameters apply at V
50 45 40 35 30 25 20 15 10
5 0
Percentage of Occurances (%)
-3
-2.5-2-1.5-1-0.5
Temperature Error (°C)
TC72-X.XMXX Sample Size = 166
= -55°C
T
A
0
0.511.522.5
3
FIGURE 2-7: Histogram of Temperature Accuracy at -55 Degrees C.
60
TC72-X.XMXX Sample Size = 166
50
= -40°C
T
A
40
30
20
10
0
Percentage of Occurances (%)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
Temperature Error (°C)
= 2.65V to 5.5V, TA = -55°C to +125°C.
DD
60
50
40
30
20
10
0
Percentage of Occurances (%)
-1.50
-1.25
-1.00
-0.75
-0.50
Temperature Error (°C)
TC72-X.XMXX Sample Size = 166 T
A
0.00
0.25
-0.25
= +65°C
0.50
0.75
FIGURE 2-10: Histogram of Temperature Accuracy at +65 Degrees C.
50 45 40 35 30 25 20 15 10
5 0
Percentage of Occurances (%)
-2 -1.5 -1 -0.5 0 0.5 1 1.5 2
Temperature Error (°C)
TC72-X.XMXX Sample Size = 166
= +85°C
T
A
1.00
1.25
1.50
FIGURE 2-8: Histogram of Temperature Accuracy at -40 Degrees C.
60
TC72-X.XMXX
50
Sample Size = 166
= +25°C
T
A
40
30
20
10
0
Percentage of Occurances (%)
0.00
0.25
0.50
0.75
1.00
1.25
-1.50
-1.25
-1.00
-0.75
-0.50
Temperature Error (°C)
-0.25
1.50
FIGURE 2-9: Histogram of Temperature Accuracy at +25 Degrees C.
FIGURE 2-11: Histogram of Temperature Accuracy at +85 Degrees C.
40
35
30
25
20
15
10
5
0
Percentage of Occurances (%)
-3
-2.5-2-1.5-1-0.5
Temperature Error (°C)
TC72-X.XMXX Sample Size = 166
= +125°C
T
A
0
0.511.522.5
3
FIGURE 2-12: Histogram of Temperature Accuracy at +125 Degrees C.
2002 Microchip Technology Inc. DS21743A-page 7
TC72
3.0 FUNCTIONAL DESCRIPTION
The TC72 consists of a band-gap type temperature sensor, a 10-bit Sigma Delta Analog-to-Digital Con­verter (ADC), an internal conversion oscillator and a double buffer digital output port. The 10-bit ADC is scaled from -128°C to +127°C; therefore, the resolution is 0.25°C per bit. The ambient temperature operating range of the TC72 is specified from -55°C to +125°C.
This device features a four-wire serial interface that is fully compatible with the SPI specification and, there­fore, allows simple communications with common microcontrollers and processors. The TC72 can be used either in a Continuous Temperature Conversion mode or a One-Shot Conversion mode. The TC72 tem­perature measurements are performed in the back­ground and, therefore, reading the temperature via the serial I/O lines does not affect the measurement in progress.
MSB LSB
0111 1101 / 0000 0000
The Continuous Conversion mode measures the tem­perature approximately every 150 ms and stores the data in the temperature registers. The TC72 has an internal clock generator that controls the automatic temperature conversion sequence. The automatic tem­perature sampling operation is repeated indefinitely until the TC72 is placed in a shutdown mode by a write operation to the Control register. The TC72 will remain in the shutdown mode until the shutdown bit in the Control register is reset.
In contrast, the One-Shot mode performs a single tem­perature measurement and returns to the power-sav­ing shut down mode. This mode is especially useful for low power applications.
Output
Code
Te m p
+25°C
+0.25°C
MSB LSB
0001 1001 / 0000 0000
MSB LSB
0000 0000 / 0100 0000
MSB LSB
0000 00 00 / 0000 0000
-55°C
-25°C
Note: The ADC converter is scaled from -128°C to -127°C, but the operating range of the
TC72 is specified from -55°C to +125°C.
0°C
-0.125°C
MSB LSB
1111 1111 / 1100 0000
MSB LSB
1110 0111 / 0000 0000
MSB LSB
1100 1001 / 0000 0000
Tem p
+125°C
FIGURE 3-1: Temperature-To-Digital Transfer Function (Non-linear Scale).
DS21743A-page 8 2002 Microchip Technology Inc.
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