TCN75A
2-Wire Serial Temperature Sensor
Features:
Description:
• Temperature-to-Digital Converter
• Accuracy:
- ±1 (typ.) from -40°C to +125°C
- ±2°C (max.) from +40°C to +125°C
• User-selectable Resolution: 0.5°C to 0.0625°C
• Operating Voltage Range: 2.7V to 5.5V
• 2-wire Interface: I2C™ Compatible
• Operating Current: 200 μA (typ.)
• Shutdown Current: 2 μA (max.)
• Power-saving One-shot Temperature
Measurement
• Available Packages: MSOP-8, SOIC-8
Microchip Technology Inc.’s TCN75A digital temperature sensor converts temperatures between -40°C and
+125°C to a digital word, with ±1°C (typ.) accuracy.
Typical Applications:
•
•
•
•
•
•
Personal Computers and Servers
Hard Disk Drives and Other PC Peripherals
Entertainment Systems
Office Equipment
Data Communication Equipment
General Purpose Temperature Monitoring
The TCN75A product comes with user-programmable
registers that provide flexibility for temperature-sensing
applications. The register settings allow user-selectable, 0.5°C to 0.0625°C temperature measurement
resolution, configuration of the power-saving Shutdown
and One-shot (single conversion on command while in
Shutdown) modes and the specification of both
temperature alert output and hysteresis limits. When
the temperature changes beyond the specified limits,
the TCN75A outputs an alert signal. The user has the
option of setting the alert output signal polarity as an
active-low or active-high comparator output for thermostat operation, or as temperature event interrupt output
for microprocessor-based systems.
This sensor has an industry standard 2-wire, I2C™
compatible serial interface, allowing up to eight devices
to be controlled in a single serial bus. These features
make the TCN75A ideal for low-cost, sophisticated
multi-zone temperature-monitoring applications.
Package Types
Typical Application
PIC®
SCL 2
R
Microcontroller
SDA
I/O Ports
SDA 1
SCL
ALERT
RPULL-UP
VDD
1 SDA
VDD 8
2 SCL
A0 7
ALERT 3
GND 4
TCN75A
8-Pin SOIC, MSOP
VDD
8 VDD
7 A0
6 A1
5 A2
3 ALERT A1 6
4 GND
A2 5
TCN75A
© 2006 Microchip Technology Inc.
DS21935C-page 1
TCN75A
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings †
VDD ....................................................................... 6.0V
Voltage at all Input/Output pins .... GND – 0.3V to 5.5V
†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
operational listings of this specification is not implied.
Exposure to maximum rating conditions for extended periods
may affect device reliability.
Storage temperature ..........................-65°C to +150°C
Ambient temp. with power applied .....-55°C to +125°C
Junction Temperature (TJ).................................. 150°C
ESD protection on all pins (HBM:MM)....... (4 kV:400V)
Latch-up current at each pin ......................... ±200 mA
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, and
TA = -40°C to +125°C.
Parameters
Sym
Min
Typ
Max
Unit
VDD
2.7
—
5.5
V
Conditions
Power Supply
Operating Voltage Range
Operating Current
IDD
—
200
500
μA
Continuous operation
Shutdown Current
ISHDN
—
0.1
2
μA
Shutdown mode
Power-On Reset (POR) Threshold
VPOR
—
1.7
—
V
VDD falling edge
Δ°C/ΔVDD
—
0.2
—
°C/V
TACY
-2
±1
+2
°C
0.5°C Resolution
tCONV
—
30
—
ms
33 samples/sec (typ.)
0.25°C Resolution
tCONV
—
60
—
ms
17 samples/sec (typ.)
0.125°C Resolution
tCONV
—
120
—
ms
8 samples/sec (typ.)
0.0625°C Resolution
tCONV
—
240
—
ms
4 samples/sec (typ.)
High-level Current
IOH
—
—
1
μA
VOH = 5V
Low-level Voltage
VOL
—
—
0.4
V
IOL= 3 mA
tRES
—
1.4
—
s
Time to 63% (89°C)
27°C (air) to 125°C (oil
bath)
Power Supply Rejection
VDD = 2.7V to 5.5V
Temperature Sensor Accuracy
TA = -40°C to +125°C
VDD = 3.3V
Internal ΣΔ ADC
Conversion Time:
Alert Output (Open-drain)
Thermal Response
Response Time
DS21935C-page 2
© 2006 Microchip Technology Inc.
TCN75A
DIGITAL INPUT/OUTPUT PIN CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground and
TA = -40°C to +125°C.
Parameters
Sym
Min
Typ
Max
Units
Conditions
Serial Input/Output (SCL, SDA, A0, A1, A2)
Input
High-level Voltage
VIH
0.7 VDD
—
—
V
Low-level Voltage
VIL
—
—
0.3 VDD
V
Input Current
IIN
-1
—
+1
μA
Low-level Voltage
VOL
—
—
0.4
V
IOL= 3 mA
High-level Current
IOH
—
—
1
μA
VOH = 5V
VOL = 0.6V
Output (SDA)
Low-level Current
Capacitance
IOL
6
—
—
mA
CIN
—
10
—
pF
VHYST
0.05 VDD
—
—
V
SDA and SCL Inputs
Hysteresis
Graphical Symbol Description
INPUT
OUTPUT
Voltage
Voltage
VDD
VDD
VIH
VOL
VIL
time
time
Current
Current
IOL
IIN
IOH
time
time
TEMPERATURE CHARACTERISTICS
Electrical Specifications: Unless otherwise indicated, VDD = +2.7V to +5.5V and GND = Ground.
Parameters
Sym
Min
Typ
Max
Units
Specified Temperature Range
TA
-40
—
+125
°C
Operating Temperature Range
TA
-40
—
+125
°C
Storage Temperature Range
TA
-65
—
+150
°C
Thermal Resistance, 8L-SOIC
θJA
—
163
—
°C/W
Thermal Resistance, 8L-MSOP
θJA
—
206
—
°C/W
Conditions
Temperature Ranges
Note 1
Thermal Package Resistances
Note 1:
Operation in this range must not cause TJ to exceed Maximum Junction Temperature (+150°C).
© 2006 Microchip Technology Inc.
DS21935C-page 3
TCN75A
SERIAL INTERFACE TIMING SPECIFICATIONS (NOTE 1)
Electrical Specifications: Unless otherwise indicated, VDD = 2.7V to 5.5V, GND = Ground, TA = -40°C to +125°C,
CL = 80 pF and all limits measured to 50% point.
Parameters
Sym
Min
Typ
Max
Units
fSC
0
—
400
kHz
Conditions
2
2-Wire I C™ Compatible Interface
Serial Port Frequency
tSC
2.5
—
—
μs
Low Clock
tLOW
1.3
—
—
μs
High Clock
tHIGH
0.6
—
—
μs
Rise Time
tR
20
—
300
ns
10% to 90% of VDD (SCL, SDA)
90% to 10% of VDD (SCL, SDA)
Clock Period
tF
20
—
300
ns
Data Setup Before SCL High
tSU-DATA
0.1
—
—
μs
Data Hold After SCL Low
tH-DATA
0
—
—
μs
tSU-START
0.6
—
—
μs
Start Condition Hold Time
tH-START
0.6
—
—
μs
Stop Condition Setup Time
tSU-STOP
0.6
—
—
μs
tB-FREE
1.3
—
—
μs
Fall Time
Start Condition Setup Time
Bus Idle
Note 1:
Specification limits are characterized but not product tested.
EE
-F
R
-S
TO
tB
U
tS
O
W
tL
tH
tH
Start Condition
DS21935C-page 4
AT
A
-D
tH
tS
U
-D
AT
A
tR
,t
F
SD
A
SC
L
tS
U
IG
H
P
-S
TA
R
T
-S
TA
R
T
Timing Diagram
Data Transmission
Stop Condition
© 2006 Microchip Technology Inc.
TCN75A
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 noted: VDD = 2.7V to 5.5V.
85
105 125
Temperature Accuracy (°C)
FIGURE 2-1:
Average Temperature
Accuracy vs. Ambient Temperature, VDD = 3.3V.
1.0
350
-1.0
VDD = 5.0V
VDD = 5.5V
250
200
150
-2.0
100
-3.0
50
-35
-15
5
25 45
TA (°C)
65
85
105 125
FIGURE 2-2:
Average Temperature
Accuracy vs. Ambient Temperature.
3.0
VDD = 2.7V
VDD = 3.3V
300
0.0
-55
Resolution
-15
5
25 45
TA (°C)
65
85
105 125
Supply Current vs. Ambient
1
0.8
0.125°C
0.0625°C
0.0
-1.0
0.5°C
0.25°C
-2.0
-35
FIGURE 2-5:
Temperature.
VDD = 3.3V
160 Devices
2.0
1.0
-55
ISHDN (µA)
Temperature Accuracy (°C)
400
0.0625°C Resolution
160 Devices
VDD = 2.7V
VDD = 3.3V
VDD = 5.0V
VDD = 5.5V
2.0
FIGURE 2-4:
Temperature Accuracy
Histogram, TA = +25°C.
IDD (µA)
Temperature Accuracy (°C)
3.0
3.0
65
2.5
25 45
TA (°C)
2.0
5
1.5
-15
1.0
-55 -35
-3.0
-3.0
0.5
-2.0
0.0
-1.0
-0.5
0.0
-1.0
0.0625°C Resolution
160 Devices
Specification
Limits
5 lots
32 Samples/lot
160 Devices
-1.5
1.0
TA = +25°C
VDD = 3.3V
-2.0
2.0
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
-2.5
VDD = 3.3V
Occurrences
Temperature Accuracy (°C)
3.0
0.6
0.4
0.2
-3.0
0
-55
-35
-15
5
25 45
TA (°C)
65
85
105 125
FIGURE 2-3:
Average Temperature
Accuracy vs. Ambient Temperature, VDD = 3.3V.
© 2006 Microchip Technology Inc.
-55
-35 -15
5
25 45
TA (°C )
65
85
105 125
FIGURE 2-6:
Shutdown Current vs.
Ambient Temperature.
DS21935C-page 5
TCN75A
Note: Unless otherwise noted: VDD = 2.7V to 5.5V.
ALERT and SDA I OL (mA)
VOL = 0.6V
42
VDD = 5.5V
VDD = 3.3V
VDD = 2.7V
36
30
24
18
12
6
Average of 10 samples per package
125
105
85
65
SOIC
45
MSOP
25
27°C (Air) to 125°C (Oil bath)
5
-55
-35
-15
5
25 45
TA (°C)
65
85
105 125
FIGURE 2-7:
ALERT and SDA IOL vs.
Ambient Temperature.
0.4
ALERT and SDA V OL (V)
Temperature Data (°C)
145
48
-2
0
FIGURE 2-9:
vs. Time.
2
4
6
8 10 12 14 16 18 20
Time (s)
TCN75A Thermal Response
IOL = 3 mA
0.3
VDD = 5.5V
VDD = 3.3V
VDD = 2.7V
0.2
0.1
0
-55 -35 -15
5
25 45
TA (°C)
65
85
105 125
FIGURE 2-8:
ALERT and SDA Output
VOL vs. Ambient Temperature.
DS21935C-page 6
© 2006 Microchip Technology Inc.
TCN75A
3.0
PIN DESCRIPTION
The descriptions of the pins are listed in Table 3-1.
TABLE 3-1:
3.1
PIN FUNCTION TABLE
MSOP, SOIC
Symbol
Function
1
SDA
Bidirectional Serial Data
2
SCL
Serial Clock Input
3
ALERT
4
GND
5
A2
Address Select Pin (bit 2)
6
A1
Address Select Pin (bit 1)
7
A0
Address Select Pin (bit 0)
8
VDD
Power Supply Input
Temperature Alert Output
Ground
Serial Data Pin (SDA)
SDA is a bidirectional input/output pin, used to serially
transmit data to and from the host controller. This pin
requires a pull-up resistor to output data.
3.2
Serial Clock Pin (SCL)
SCL is a clock input pin. All communication and timing
is relative to the signal on this pin. The clock is
generated by the host controller on the bus.
3.3
Power Supply Input (VDD)
VDD is the power pin. The operating voltage, as
specified in the DC electrical specification table, is
applied on this pin.
3.4
Ground (GND)
GND is the system ground pin.
© 2006 Microchip Technology Inc.
3.5
ALERT Output
The TCN75A’s ALERT pin is an open-drain output. The
device outputs an alert signal when the ambient
temperature goes beyond the user-programmed
temperature limit.
3.6
Address Pins (A2, A1, A0)
A2, A1 and A0 are device or slave address input pins.
The address pins are the Least Significant bits (LSb) of
the device address bits. The Most Significant bits
(MSb) (A6, A5, A4, A3) are factory-set to . This
is illustrated in Table 3-2.
TABLE 3-2:
Device
TCN75A
Note:
SLAVE ADDRESS
A6
A5
A4
A3
A2
A1
A0
1
0
0
1
X
X
X
User-selectable address is shown by X.
DS21935C-page 7
TCN75A
4.0
SERIAL COMMUNICATION
4.1.1
4.1
2-Wire SMBus/Standard Mode
I2C™ Protocol-Compatible
Interface
Data transfers are initiated by a Start condition
(START), followed by a 7-bit device address and a
read/write bit. An Acknowledge (ACK) from the slave
confirms the reception of each byte. Each access must
be terminated by a Stop condition (STOP).
The TCN75A serial clock input (SCL) and the
bidirectional serial data line (SDA) form a 2-wire
bidirectional SMBus/Standard mode I2C compatible
communication port (refer to the Digital Input/output
Pin Characteristics Table and Serial Interface Timing Specifications (Note 1) Table).
The following bus protocol has been defined:
TABLE 4-1:
TCN75A SERIAL BUS
PROTOCOL DESCRIPTIONS
Term
Description
Master
The device that controls the serial bus,
typically a microcontroller.
Slave
The device addressed by the master,
such as the TCN75A.
Transmitter Device sending data to the bus.
Receiver
Device receiving data from the bus.
START
A unique signal from master to initiate
serial interface with a slave.
STOP
A unique signal from the master to
terminate serial interface from a slave.
Read/Write A read or write to the TCN75A
registers.
ACK
A receiver Acknowledges (ACK) the
reception of each byte by polling the
bus.
NAK
A receiver Not-Acknowledges (NAK) or
releases the bus to show End-of-Data
(EOD).
Busy
Communication is not possible
because the bus is in use.
Not Busy
The bus is in the idle state, both SDA
and SCL remain high.
Data Valid
SDA must remain stable before SCL
becomes high in order for a data bit to
be considered valid. During normal
data transfers, SDA only changes state
while SCL is low.
DS21935C-page 8
DATA TRANSFER
Repeated communication is initiated after tB-FREE.
This device does not support sequential register read/
write. Each register needs to be addressed using the
Register Pointer.
This device supports the Receive Protocol. The
register can be specified using the pointer for the initial
read. Each repeated read or receive begins with a Start
condition and address byte. The TCN75A retains the
previously selected register. Therefore, it outputs data
from the previously-specified register (repeated pointer
specification is not necessary).
4.1.2
MASTER/SLAVE
The bus is controlled by a master device (typically a
microcontroller) that controls the bus access and
generates the Start and Stop conditions. The TCN75A
is a slave device and does not control other devices in
the bus. Both master and slave devices can operate as
either transmitter or receiver. However, the master
device determines which mode is activated.
4.1.3
START/STOP CONDITION
A high-to-low transition of the SDA line (while SCL is
high) is the Start condition. All data transfers must be
preceded by a Start condition from the master. If a Start
condition is generated during data transfer, the
TCN75A resets and accepts the new Start condition.
A low-to-high transition of the SDA line (while SCL is
high) signifies a Stop condition. If a Stop condition is
introduced during data transmission, the TCN75A
releases the bus. All data transfers are ended by a Stop
condition from the master.
4.1.4
ADDRESS BYTE
Following the Start condition, the host must transmit an
8-bit address byte to the TCN75A. The address for the
TCN75A Temperature Sensor is ‘1001,A2,A1,A0’ in
binary, where the A2, A1 and A0 bits are set externally
by connecting the corresponding pins to VDD ‘1’ or
GND ‘0’. The 7-bit address transmitted in the serial bit
stream must match the selected address for the
TCN75A to respond with an ACK. Bit 8 in the address
byte is a read/write bit. Setting this bit to ‘1’ commands
a read operation, while ‘0’ commands a write operation
(see Figure 4-1).
© 2006 Microchip Technology Inc.
TCN75A
4.1.6
Address Byte
SCL
1
2
3
4
5
6
7
SDA
1
0
0
1 A2 A1 A0
8
9
A
C
K
Start
Address
Code
Slave
Address
R/W
TCN75A Response
FIGURE 4-1:
4.1.5
Device Addressing.
DATA VALID
After the Start condition, each bit of data in
transmission needs to be settled for a time specified by
tSU-DATA before SCL toggles from low-to-high (see
“Sensor And EEPROM Serial Interface Timing
Specifications” on Page 4).
© 2006 Microchip Technology Inc.
ACKNOWLEDGE (ACK)
Each receiving device, when addressed, is obliged to
generate an ACK bit after the reception of each byte.
The master device must generate an extra clock pulse
for ACK to be recognized.
The acknowledging device pulls down the SDA line for
tSU-DATA before the low-to-high transition of SCL from
the master. SDA also needs to remain pulled down for
tH-DATA after a high-to-low transition of SCL.
During read, the master must signal an End-of-Data
(EOD) to the slave by not generating an ACK bit (NAK)
once the last bit has been clocked out of the slave. In
this case, the slave will leave the data line released to
enable the master to generate the Stop condition.
DS21935C-page 9
TCN75A
5.0
FUNCTIONAL DESCRIPTION
The TCN75A temperature sensor consists of a bandgap type temperature sensor, a ΣΔ Analog-to-Digital
Converter (ADC), user-programmable registers and a
2-wire I2C protocol-compatible serial interface.
5.1
The TCN75A uses the difference in the base-emitter
voltage of a transistor while its collector current is
changed from IC1 to IC2. With this method, the ΔVBE
depends only on the ratio of the two currents and the
ambient temperature, as shown in Equation 5-1.
EQUATION 5-1:
Resolution
kT
One-Shot
Shutdown
Fault Queue
Alert Polarity
Δ V BE = ⎛⎝ ------⎞⎠ × ln ( IC 1 ⁄ IC 2 )
q
0.5°C
0.25°C
0.125°C
0.0625°C
Where:
T = temperature in kelvin
ΔVBE = change in diode base-emitter
voltage
Alert Comp/Int
Configuration
Register
ΣΔ ADC
THYST
Register
Band-Gap
Temperature
Sensor
TSET
Register
FIGURE 5-1:
DS21935C-page 10
k = Boltzmann's constant
q = electron charge
Temperature
Register
Register
Pointer
Temperature Sensor
I2C™
Interface
Functional Block Diagram.
IC1 and IC2 = currents with n:1 ratio
5.2
ΣΔ Analog-to-Digital Converter
A Sigma-Delta ADC is used to convert ΔVBE to a digital
word that corresponds to the transistor temperature.
The converter has an adjustable resolution from 0.5°C
(at 30 ms conversion time) to 0.0625°C (at 240 ms
conversion time). Thus, it allows the user to make tradeoffs between resolution and conversion time. Refer to
Section 5.3.2 “Sensor Configuration Register
(CONFIG)” and Section 5.3.4.7 “ΣΔ ADC Resolution”
for details.
© 2006 Microchip Technology Inc.
TCN75A
5.3
Registers
Resolution
The TCN75A has four registers that are user-accessible. These registers are specified as the Ambient
Temperature (TA) register, the Temperature Limit-set
(TSET) register, the Temperature Hysteresis (THYST)
register and device Configuration (CONFIG) register.
One-Shot
Shutdown
Fault Queue
The Ambient Temperature register is a read-only
register and is used to access the ambient temperature
data. The data from the ADC is loaded in parallel in the
register. The Temperature Limit-set and Temperature
Hysteresis registers are read/write registers that
provide user-programmable temperature limits. If the
ambient temperature drifts beyond the programmed
limits, the TCN75A outputs an alert signal using the
ALERT pin (refer to Section 5.3.4.3 “ALERT Output
Configuration”). The device Configuration register
provides access for the user to configure the TCN75A’s
various features. These registers are described in
further detail in the following sections.
Alert Polarity
Alert Comp/Int
Configuration
Register
THYST
Register
ALERT Output
Control Logic
TSET
Register
The registers are accessed by sending register
pointers to the TCN75A using the serial interface. This
is an 8-bit pointer. However, the two Least Significant
bits (LSbs) are used as pointers and all other bits need
to be cleared . This device has additional registers
that are reserved for test and calibration. If these
registers are accessed, the device may not perform
according to the specification. The pointer description
is shown below.
REGISTER 5-1:
ALERT
Output
Temperature
Register
FIGURE 4-2:
Register Block Diagram.
REGISTER POINTER
U-0
U-0
U-0
U-0
U-0
U-0
R/W-0
R/W-0
0
0
0
0
0
0
P1
P0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 7-3
Unimplemented: Read as ‘0’
bit 2-0
Pointer bits
00 = Temperature register (TA)
01 = Configuration register (CONFIG)
10 = Temperature Hysteresis register (THYST)
11 = Temperature Limit-set register (TSET)
x = Bit is unknown
.
© 2006 Microchip Technology Inc.
DS21935C-page 11
TCN75A
TABLE 5-1:
Register
Pointer
P1 P0
MSB/
LSB
BIT ASSIGNMENT SUMMARY FOR ALL REGISTERS
Bit Assignment
7
Ambient Temperature Register (TA)
00
6
5
4
3
2
1
0
MSB
Sign
26°C
25°C
24°C
23°C
22°C
21°C
20°C
LSB
2-1°C
2-2°C
2-3°C
2-4°C
0
0
0
0
ALERT
Polarity
COMP/INT
Shutdown
Sensor Configuration Register (CONFIG)
01
LSB
One-Shot
Resolution
Temperature Hysteresis Register (THYST)
10
MSB
LSB
Sign
26°C
25°C
24°C
23°C
22°C
21°C
20°C
0
0
0
0
0
0
0
26°C
25°C
24°C
23°C
22°C
21°C
20°C
0
0
0
0
0
0
0
-1
2 °C
Temperature Limit-Set Register (TSET)
11
MSB
LSB
DS21935C-page 12
Sign
-1
2 °C
Fault Queue
© 2006 Microchip Technology Inc.
TCN75A
5.3.1
AMBIENT TEMPERATURE
REGISTER (TA)
The TCN75A has a 16-bit read-only Ambient
Temperature register that contains 9-bit to 12-bit
temperature data. (0.5°C to 0.0625°C resolutions,
respecively). This data is formatted in two’s
complement. The bit assignments, as well as the
corresponding resolution, is shown in the register
assignment below.
conversion in the background. The decimal code to
ambient temperature conversion is shown in
Equation 5-2:
EQUATION 5-2:
T A = Code × 2
Where:
TA = Ambient Temperature (°C)
The refresh rate of this register depends on the
selected ADC resolution. It takes 30 ms (typ.) for 9-bit
data and 240 ms (typ.) for 12-bit data. Since this
register is double-buffered, the user can read the
register while the TCN75A performs Analog-to-Digital
REGISTER 5-2:
–4
Code = TCN75A output in decimal
AMBIENT TEMPERATURE REGISTER (TA) - ADDRESS b
Upper Half:
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
Sign
26 °C
25 °C
24 °C
23 °C
22 °C
21 °C
20 °C
bit 15
bit 8
Lower Half:
R-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2-1 °C/bit
2-2 °C
2-3 °C
2-4 °C
0
0
0
0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
Note 1:
x = Bit is unknown
When the 0.5°C, 0.25°C or 0.125°C resolutions are selected, bit 6, bit 7 or bit 8 will remain clear ,
respectively.
© 2006 Microchip Technology Inc.
DS21935C-page 13
TCN75A
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Note:
SCL
SDA
S
1
0
0
A
2
1
A
1
A
A
0
W C
K
0
0
0
Address Byte
0
0
0
0
It is not necessary to
select the register
pointer if it was set from
the previous read/write.
(see Section 4.1.1)
A
C
K
0
TA Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
0
0
1
1
0
0
1
1
2
3
4
5
6
7
8
0
1
0
0
0
0
0
0
SCL
SDA
S
A
K
Address Byte
A
C
K
P
LSB Data
MSB Data
TCN75A
N
A
K
Master
Master
FIGURE 5-2:
Timing Diagram for Reading +25.25°C Temperature from the TA Register (See
Section 4.0 “Serial Communication”).
DS21935C-page 14
© 2006 Microchip Technology Inc.
TCN75A
5.3.2
SENSOR CONFIGURATION
REGISTER (CONFIG)
The TCN75A has an 8-bit read/write Configuration
register that allows the user to select the different
features. These features include shutdown, ALERT
output select as comparator or interrupt output, ALERT
output polarity, fault queue cycle, temperature
measurement resolution and One-shot mode (single
conversion while in shutdown). These functions are
described in detail in the following sections.
REGISTER 5-3:
R/W-0
CONFIGURATION REGISTER (CONFIG) - ADDRESS b
R/W-0
One-Shot
R/W-0
R/W-0
Resolution
R/W-0
Fault Queue
R/W-0
R/W-0
R/W-0
ALERT
Polarity
COMP/INT
Shutdown
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 7
ONE-SHOT bit
1 = Enabled
0 = Disabled (Power-up default)
bit 5-6
ΣΔ ADC RESOLUTION bits
00 = 9 bit or 0.5°C (Power-up default)
01 = 10 bit or 0.25°C
10 = 11 bit or 0.125°C
11 = 12 bit or 0.0625°C
bit 3-4
FAULT QUEUE bits
00 = 1 (Power-up default)
01 = 2
10 = 4
11 = 6
bit 2
ALERT POLARITY bit
1 = Active-high
0 = Active-low (Power-up default)
bit 1
COMP/INT bit
1 = Interrupt mode
0 = Comparator mode (Power-up default)
bit 0
SHUTDOWN bit
1 = Enable
0 = Disable (Power-up default)
© 2006 Microchip Technology Inc.
x = Bit is unknown
DS21935C-page 15
TCN75A
• Writing to the CONFIG Register to change the resolution to 0.0625°C b.
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
W C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
1
SCL
SDA
S
A
K
Address Byte
A
C
K
CONFIG Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
0
1
1
0
0
0
0
0
1
A
C
K
P
MSB Data
TCN75A
• Reading the CONFIG Register.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Note:
SCL
SDA
S
1
0
0
A
2
1
A
1
A
A
0
W C
K
0
0
Address Byte
0
0
0
0
0
A
C
K
1
It is not necessary to
select the register
pointer if it was set from
the previous read/write
(see Section 4.1.1).
CONFIG Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
1
1
0
0
0
0
0
SCL
SDA
S
A
K
Address Byte
N
A
K
P
Data
TCN75A
FIGURE 5-3:
Timing Diagram for Writing and Reading from the Configuration Register (See
Section 4.0 “Serial Communication”).
DS21935C-page 16
© 2006 Microchip Technology Inc.
TCN75A
5.3.3
TEMPERATURE HYSTERESIS
REGISTER (THYST)
The TCN75A has a 16-bit read/write Temperature
Hysteresis register that contains a 9-bit data in two’s
compliment format. This register is used to set a
hysteresis for the TSET limit. Therefore, the data
represents a minimum temperature limit. If the ambient
temperature drifts below the specified limit, the
TCN75A asserts an alert output (refer to
Section 5.3.4.3 “ALERT Output Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are don’t cares.
The power-up default value of THYST register is 75°C,
or b in binary.
REGISTER 5-4:
TEMPERATURE HYSTERESIS REGISTER (THYST) - ADDRESS b
Upper Half:
R/W-0
R/W-1
R/W-0
R/W-0
R/W-1
R/W-0
R/W-1
R/W-1
Sign
26 °C
25 °C
24 °C
23 °C
22 °C
21 °C
20 °C
bit 15
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2-1 °C
0
0
0
0
0
0
0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2006 Microchip Technology Inc.
x = Bit is unknown
DS21935C-page 17
TCN75A
• Writing to the THYST Register to set the temperature hysteresis to 95°C b.
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
W C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
1
0
SCL
SDA
S
A
K
Address Byte
A
C
K
THYST Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
0
1
0
1
1
1
1
1
A
C
K
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
MSB Data
A
C
K
P
LSB Data
TCN75A
TCN75A
• Reading the THYST Register.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Note:
SCL
SDA
S
1
0
0
A
2
1
A
1
A
A
0
W C
K
0
0
0
Address Byte
0
0
0
1
It is not necessary to
select the register
pointer if it was set from
the previous read/write
(see Section 4.1.1).
A
C
K
0
THYST Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
1
0
1
1
1
1
1
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
SCL
SDA
S
A
K
Address Byte
A
C
K
P
LSB Data
MSB Data
TCN75A
N
A
K
Master
Master
FIGURE 5-4:
Timing Diagram for Writing and Reading from the Temperature Hysteresis Register
(See Section 4.0 “Serial Communication”).
DS21935C-page 18
© 2006 Microchip Technology Inc.
TCN75A
5.3.4
TEMPERATURE LIMIT-SET
REGISTER (TSET)
The TCN75A has a 16-bit read/write Temperature
Limit-Set register (TSET) which contains a 9-bit data in
two’s compliment format. This data represents a maximum temperature limit. If the ambient temperature
exceeds this specified limit, the TCN75A asserts an
alert output. (Refer to Section 5.3.4.3 “ALERT Output
Configuration”).
This register uses the nine Most Significant bits (MSbs)
and all other bits are “don’t cares”.
The power-up default value of the TSET register is
80°C, or b in binary.
REGISTER 5-5:
TEMPERATURE LIMIT-SET REGISTER (TSET) - ADDRESS b
Upper Half:
R/W-0
R/W-1
R/W-0
R/W-1
R/W-0
R/W-0
R/W-0
R/W-0
Sign
26 °C
25 °C
24 °C
23 °C
22 °C
21 °C
20 °C
bit 15
bit 8
Lower Half:
R/W-0
R-0
R-0
R-0
R-0
R-0
R-0
R-0
2-1 °C
0
0
0
0
0
0
0
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
-n = Value at POR
‘1’ = Bit is set
‘0’ = Bit is cleared
© 2006 Microchip Technology Inc.
x = Bit is unknown
DS21935C-page 19
TCN75A
• Writing to the TSET Register to set the temperature limit to 90°C, b
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
W C
1
2
3
4
5
6
7
8
0
0
0
0
0
0
1
1
SCL
SDA
S
A
K
Address Byte
A
C
K
TSET Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
0
1
0
1
1
0
1
0
A
C
K
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
MSB Data
A
C
K
P
LSB Data
TCN75A
TCN75A
• Reading the TSET Register.
1
2
3
4
5
6
7
8
1
2
3
4
5
6
7
8
Note:
SCL
SDA
S
1
0
0
A
2
1
A
1
A
A
0
W C
K
0
0
0
Address Byte
0
0
0
1
It is not necessary to
select the register
pointer if it was set from
the previous read/write.
(see Section 4.1.1)
A
C
K
1
TSET Pointer
TCN75A
TCN75A
1
2
3
4
5
6
7
8
1
0
0
1
A
2
A
1
A
0
R C
1
2
3
4
5
6
7
8
0
1
0
1
1
0
1
0
1
2
3
4
5
6
7
8
0
0
0
0
0
0
0
0
SCL
SDA
S
A
K
Address Byte
A
C
K
P
LSB Data
MSB Data
TCN75A
N
A
K
Master
Master
FIGURE 5-5:
Timing Diagram for Writing and Reading from the Temperature Limit-set Register
(See Section 4.0 “Serial Communication”).
DS21935C-page 20
© 2006 Microchip Technology Inc.
TCN75A
5.3.4.1
5.3.4.3
Shutdown Mode
The Shutdown mode disables all power-consuming
activities (including temperature sampling operations)
while leaving the serial interface active. The device
consumes 2 μA (max.) in this mode. It remains in this
mode until the Configuration register is updated to
enable continuous conversion or until power is
recycled.
In Shutdown mode, the CONFIG, TA, TSET and THYST
registers can be read or written to; however, the serial
bus activity will increase the shutdown current.
5.3.4.2
One-Shot Mode
The TCN75A can also be used in a One-shot mode that
can be selected using bit 7 of the CONFIG register. The
One-shot mode performs a single temperature
measurement and returns to Shutdown mode. This
mode is especially useful for low-power applications
where temperature is measured upon command from a
controller. For example, a 9-bit TA in One-shot mode
consumes 200 μA (typ.) for 30 ms and 0.1 μA (typ.)
during shutdown.
To access this feature, the device needs to initially be
in Shutdown mode. This is done by sending a byte to
the CONFIG register with bit 0 set and bit 7 cleared
. Once the device is in Shutdown mode, the
CONFIG register needs to be written to again, with bit
0 and bit 7 set . This begins the single conversion
cycle of tCONV, 30ms for 9-bit data. Once the
conversion is completed, TA is updated and bit 7 of
CONFIG becomes cleared by the TCN75A.
TABLE 5-6:
SHUTDOWN AND ONE-SHOT
MODE DESCRIPTION
Operational Mode
One-Shot
(Bit 7)
Shutdown
(Bit 0)
Continuous Conversion
0
0
Shutdown
0
1
Continuous Conversion
1
0
(One-shot is ignored)
One-shot (Note 1)
1
1
Note 1: The shutdown command needs to
be programmed before sending a oneshot command .
ALERT Output Configuration
The ALERT output can be configured as either a
comparator output or as Interrupt Output mode using
bit 1 of CONFIG. The polarity can also be specified as
an active-high or active-low using bit 2 of CONFIG.
The following sections describe each output mode,
while Figure 5-6 gives a graphical description.
5.3.4.4
Comparator Mode
In Comparator mode, the ALERT output is asserted
when TA is greater than TSET. The pin remains active
until TA is lower than THYST. The Comparator mode is
useful for thermostat-type applications, such as turning
on a cooling fan or triggering a system shutdown when
the temperature exceeds a safe operating range.
In Comparator mode, if the device enters the Shutdown
mode with asserted ALERT output, the output remains
active during shutdown. The device must be operating
in continuous conversion, with TA below THYST, for the
ALERT output to be deasserted.
5.3.4.5
Interrupt Mode
In Interrupt mode, the ALERT output is asserted when TA
is greater than TSET. However, the output is deasserted
when the user performs a read from any register. This
mode is designed for interrupt-driven, microcontrollerbased systems. The microcontroller receiving the interrupt will have to acknowledge the interrupt by reading
any register from the TCN75A. This will clear the interrupt
and the ALERT pin will become deasserted. When TA
drifts below THYST, the TCN75A outputs another interrupt
and the controller needs to read a register to deassert the
ALERT output. Shutting down the device will also reset,
or deassert, the ALERT output.
TSET
TA
THYST
ALERT
Comparator mode
Active-low
ALERT
Interrupt mode
Active-low
Register
Read
*
* See Section 5.3.4.5 “Interrupt Mode”
FIGURE 5-6:
© 2006 Microchip Technology Inc.
Alert Output.
DS21935C-page 21
TCN75A
5.3.4.6
5.4
Fault Queue
The fault queue feature can be used as a filter to lessen
the probability of spurious activation of the ALERT pin.
TA must remain above TSET for the consecutive number of conversion cycles selected using the Fault
Queue bits. Bit 3 and bit 4 of CONFIG can be used to
select up to six fault queue cycles. For example, if six
fault queues are selected, TA must be greater than
TSET for six consecutive conversions before ALERT is
asserted as a comparator or an interrupt output.
This queue setting also applies for THYST. If six fault
queues are selected, TA must remain below THYST for
six consecutive conversions before ALERT is deasserted (Comparator mode) or before another interrupt
is asserted (Interrupt mode).
5.3.4.7
Summary of Power-up Condition
The TCN75A has an internal Power-on Reset (POR)
circuit. If the power supply voltage VDD glitches down
to the 1.7V (typ.) threshold, the device resets the
registers to the power-up default settings.
Table 5-2 shows the power-up default summary.
TABLE 5-2:
Register
Data
(Hex)
TA
TSET
THYST
Pointer
0000
A000
9600
00
CONFIG
00
ΣΔ ADC Resolution
The TCN75A provides access to select the ADC
resolution from 9-bit to 12-bit (0.5°C to 0.0625°C
resolution) using bit 6 and bit 5 of the CONFIG register.
The user can gain better insight into the trends and
characteristics of the ambient temperature by using a
finer resolution. Increasing the resolution also reduces
the quantization error. Figure 2-3 shows accuracy
versus resolution.
Table 5-1 shows the TA register conversion time for the
corresponding resolution.
TABLE 5-1:
POWER-UP DEFAULTS
Power-up Defaults
0°C
80°C
75°C
Temperature register
Continuous Conversion
Comparator mode
Active-low Output
Fault Queue 1
9-bit Resolution
At power-up, the TCN75A has an inherent 2 ms (typ.)
power-up delay before updating the registers with
default values and start a conversion cycle. This delay
reduces register corruption due to unsettled power.
After power-up, it takes tCONV for the TCN75A to
update the TA register with valid temperature data.
RESOLUTION AND
CONVERSION TIME
Bits
Resolution
tCONV (typ.)
9
10
11
12
0.5
0.25
0.125
0.0625
30 ms
60 ms
120 ms
240 ms
DS21935C-page 22
© 2006 Microchip Technology Inc.
TCN75A
6.0
APPLICATIONS INFORMATION
6.1
Connecting to the Serial Bus
The SDA and SCL serial interface are open-drain pins
that require pull-up resistors. This configuration is
shown in Figure 6-1.
VDD
R
R
TCN75A
SDA
SCL
PIC®
MCU
The ALERT output can be wire-ORed with a number of
other open-drain devices. In such applications, the
output needs to be programmed as an active-low
output. Most systems will require pull-up resistors for
this configuration.
6.3
The TCN75A does not require any additional components besides the master controller in order to measure
temperature. However, it is recommended that a
decoupling capacitor of 0.1 μF to 1 μF be used
between the VDD and GND pins. A high-frequency
ceramic capacitor is recommended. It is necessary for
the capacitor to be located as close as possible to the
power pins in order to provide effective noise
protection.
6.4
FIGURE 6-1:
Interface.
Pull-up Resistors On Serial
The TCN75A is designed to meet 0.4V (max.) voltage
drop at 3 mA of current. This allows the TCN75A to
drive lower values of pull-up resistors and higher bus
capacitance. In this application, all devices on the bus
must meet the same pull-down current requirements.
6.2
Typical Application
Microchip provides several microcontroller product
lines with Master Synchronous Serial Port Modules
(MSSP) that include the I2C interface mode. This
module implements all master and slave functions and
simplifies the firmware development overhead.
Figure 6-2 shows a typical application using the
PIC16F737 as a master to control other Microchip
slave products, such as EEPROM, fan speed
controllers and the TCN75A temperature sensor
connected to the bus.
Layout Considerations
Thermal Considerations
The TCN75A measures temperature by monitoring the
voltage of a diode located in the die. A low-impedance
thermal path between the die and the Printed Circuit
Board (PCB) is provided by the pins. Therefore, the
TCN75A effectively monitors the temperature of the
PCB. However, the thermal path for the ambient air is
not as efficient because the plastic device package
functions as a thermal insulator.
A potential for self-heating errors can exist if the
TCN75A SDA and SCL communication lines are
heavily loaded with pull-ups. Typically, the self-heating
error is negligible because of the relatively small
current consumption of the TCN75A. However, in order
to maximize the temperature accuracy, the SDA and
SCL pins need to be lightly loaded.
SDA SCL
PIC16F737
Microcontroller
24LC01
EEPROM
TC654
Fan Speed
Controller
TCN75A
Temperature
Sensor
FIGURE 6-2:
Bus.
Multiple Devices on I2C™
© 2006 Microchip Technology Inc.
DS21935C-page 23
TCN75A
7.0
PACKAGING INFORMATION
7.1
Package Marking Information
Example:
8-Lead MSOP
N75A/E
645256
XXXXX
YWWNNN
8-Lead SOIC (150 mil)
XXXXXXXX
XXXXYYWW
NNN
Legend: XX...X
Y
YY
WW
NNN
e3
*
Note:
DS21935C-page 24
Example:
TCN75AV
e3
OA^^0645
256
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
Pb-free JEDEC designator for Matte Tin (Sn)
This package is Pb-free. The Pb-free JEDEC designator ( e3 )
can be found on the outer packaging for this package.
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.
© 2006 Microchip Technology Inc.
TCN75A
8-Lead Plastic Micro Small Outline Package (UA) (MSOP)
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
D
N
E
E1
NOTE 1
1
2
e
b
A2
A
ϕ
c
L1
A1
Number of Pins
Pitch
Overall Height
Molded Package
Standoff
Overall Width
Molded Package
Overall Length
Foot Length
Footprint
Foot Angle
Lead Thickness
Lead Width
Units
Dimension Limits
N
e
A
Thickness
A2
A1
E
Width
E1
D
L
L1
ϕ
c
b
MIN
—
0.75
0.00
0.40
0°
0.08
0.22
MILLIMETERS
NOM
8
0.65 BSC
—
0.85
—
4.90 BSC
3.00 BSC
3.00 BSC
0.60
0.95 REF
—
—
—
L
MAX
1.10
0.95
0.15
0.80
8°
0.23
0.40
Notes:
1. Pin 1 visual index feature may vary, but must be located within the hatched area.
2. Dimensions D and E1 do not include mold flash or protrusions. Mold flash or protrusions
shall not exceed 0.15 mm per side.
3. Dimensioning and tolerancing per ASME Y14.5M
BSC: Basic Dimension. Theoretically exact value shown without tolerances.
REF: Reference Dimension, usually without tolerance, for information purposes only.
Microchip Technology Drawing No. C04–111, Sept. 8, 2006
© 2006 Microchip Technology Inc.
DS21935C-page 25
TCN75A
8-Lead Plastic Small Outline (OA) – Narrow, 150 mil Body (SOIC)
Note:
For the most current package drawings, please see the Microchip Packaging Specification located at
http://www.microchip.com/packaging
E
E1
p
D
2
B
n
1
h
α
45°
c
A2
A
φ
β
L
Units
Dimension Limits
n
p
INCHES*
NOM
8
.050
.061
.056
.007
.237
.154
.193
.015
.025
4
.009
.017
12
12
MAX
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
MAX
Number of Pins
Pitch
Overall Height
A
.053
.069
1.75
Molded Package Thickness
.052
.061
1.55
A2
Standoff
§
A1
.004
.010
0.25
Overall Width
E
.228
.244
6.20
Molded Package Width
E1
.146
.157
3.99
Overall Length
D
.189
.197
5.00
Chamfer Distance
h
.010
.020
0.51
Foot Length
L
.019
.030
0.76
φ
Foot Angle
0
8
8
c
Lead Thickness
.008
.010
0.25
Lead Width
B
.013
.020
0.51
α
Mold Draft Angle Top
0
15
15
β
Mold Draft Angle Bottom
0
15
15
* Controlling Parameter
§ Significant Characteristic
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
DS21935C-page 26
MIN
A1
MIN
© 2006 Microchip Technology Inc.
TCN75A
APPENDIX A:
REVISION HISTORY
Revision C (November 2006)
•
•
•
•
•
Updated accuracy specification limits
Numerous edits throughout data sheet
Updated package outline drawings
Added disclaimers to package outline drawings
Updated package marking information for pb-free
markings.
Revision B (May 2006)
• Revised Product ID System; Added OA713 and
UA713 packages.
Revision A (January 2005)
• Original release of this document.
© 2006 Microchip Technology Inc.
DS21935C-page 27
TCN75A
NOTES:
DS21935C-page 28
© 2006 Microchip Technology Inc.
TCN75A
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
/XX
Device
Temperature
Range
Package
Device:
TCN75A:
Temperature Sensor
Temperature
Range:
V
Package:
OA
OA713
=
=
UA
UA713
=
=
= -40°C to +125°C
Examples:
a)
b)
TCN75AVOA:
TCN75AVOA713:
8LD SOIC package.
Tape and Reel,
8LD SOIC package.
a)
b)
TCN75AVUA:
TCN75AVUA713:
8LD MSOP package.
Tape and Reel,
8LD MSOP package.
Plastic SOIC, (150 mil Body), 8-lead
Plastic SOIC, (150 mil Body), 8-lead,
Tape & Reel
Plastic Micro Small Outline (MSOP), 8-lead
Plastic Micro Small Outline (MSOP), 8-lead
Tape & Reel
© 2006 Microchip Technology Inc.
DS21935C-page 29
TCN75A
NOTES:
DS21935C-page 30
© 2006 Microchip Technology Inc.
Note the following details of the code protection feature on Microchip devices:
•
Microchip products meet the specification contained in their particular Microchip Data Sheet.
•
Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the
intended manner and under normal conditions.
•
There are dishonest and possibly illegal methods used to breach the code protection feature. All of these methods, to our
knowledge, require using the Microchip products in a manner outside the operating specifications contained in Microchip’s Data
Sheets. Most likely, the person doing so is engaged in theft of intellectual property.
•
Microchip is willing to work with the customer who is concerned about the integrity of their code.
•
Neither Microchip nor any other semiconductor manufacturer can guarantee the security of their code. Code protection does not
mean that we are guaranteeing the product as “unbreakable.”
Code protection is constantly evolving. We at Microchip are committed to continuously improving the code protection features of our
products. Attempts to break Microchip’s code protection feature may be a violation of the Digital Millennium Copyright Act. If such acts
allow unauthorized access to your software or other copyrighted work, you may have a right to sue for relief under that Act.
Information contained in this publication regarding device
applications and the like is provided only for your convenience
and may be superseded by updates. It is your responsibility to
ensure that your application meets with your specifications.
MICROCHIP MAKES NO REPRESENTATIONS OR
WARRANTIES OF ANY KIND WHETHER EXPRESS OR
IMPLIED, WRITTEN OR ORAL, STATUTORY OR
OTHERWISE, RELATED TO THE INFORMATION,
INCLUDING BUT NOT LIMITED TO ITS CONDITION,
QUALITY, PERFORMANCE, MERCHANTABILITY OR
FITNESS FOR PURPOSE. Microchip disclaims all liability
arising from this information and its use. Use of Microchip
devices in life support and/or safety applications is entirely at
the buyer’s risk, and the buyer agrees to defend, indemnify and
hold harmless Microchip from any and all damages, claims,
suits, or expenses resulting from such use. No licenses are
conveyed, implicitly or otherwise, under any Microchip
intellectual property rights.
Trademarks
The Microchip name and logo, the Microchip logo, Accuron,
dsPIC, KEELOQ, microID, MPLAB, PIC, PICmicro, PICSTART,
PRO MATE, PowerSmart, rfPIC, and SmartShunt are
registered trademarks of Microchip Technology Incorporated
in the U.S.A. and other countries.
AmpLab, FilterLab, Migratable Memory, MXDEV, MXLAB,
SEEVAL, SmartSensor and The Embedded Control Solutions
Company are registered trademarks of Microchip Technology
Incorporated in the U.S.A.
Analog-for-the-Digital Age, Application Maestro, CodeGuard,
dsPICDEM, dsPICDEM.net, dsPICworks, ECAN,
ECONOMONITOR, FanSense, FlexROM, fuzzyLAB,
In-Circuit Serial Programming, ICSP, ICEPIC, Linear Active
Thermistor, Mindi, MiWi, MPASM, MPLIB, MPLINK, PICkit,
PICDEM, PICDEM.net, PICLAB, PICtail, PowerCal,
PowerInfo, PowerMate, PowerTool, REAL ICE, rfLAB,
rfPICDEM, Select Mode, Smart Serial, SmartTel, Total
Endurance, UNI/O, WiperLock and ZENA are trademarks of
Microchip Technology Incorporated in the U.S.A. and other
countries.
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.
© 2006, Microchip Technology Incorporated, Printed in the
U.S.A., All Rights Reserved.
Printed on recycled paper.
Microchip received ISO/TS-16949:2002 certification for its worldwide
headquarters, design and wafer fabrication facilities in Chandler and
Tempe, Arizona, Gresham, Oregon and Mountain View, California. The
Company’s quality system processes and procedures are for its PIC®
8-bit MCUs, KEELOQ® code hopping devices, Serial EEPROMs,
microperipherals, nonvolatile memory and analog products. In addition,
Microchip’s quality system for the design and manufacture of
development systems is ISO 9001:2000 certified.
© 2006 Microchip Technology Inc.
DS21935C-page 31
WORLDWIDE SALES AND SERVICE
AMERICAS
ASIA/PACIFIC
ASIA/PACIFIC
EUROPE
Corporate Office
2355 West Chandler Blvd.
Chandler, AZ 85224-6199
Tel: 480-792-7200
Fax: 480-792-7277
Technical Support:
http://support.microchip.com
Web Address:
www.microchip.com
Asia Pacific Office
Suites 3707-14, 37th Floor
Tower 6, The Gateway
Habour City, Kowloon
Hong Kong
Tel: 852-2401-1200
Fax: 852-2401-3431
India - Bangalore
Tel: 91-80-4182-8400
Fax: 91-80-4182-8422
India - New Delhi
Tel: 91-11-4160-8631
Fax: 91-11-4160-8632
Austria - Wels
Tel: 43-7242-2244-39
Fax: 43-7242-2244-393
Denmark - Copenhagen
Tel: 45-4450-2828
Fax: 45-4485-2829
India - Pune
Tel: 91-20-2566-1512
Fax: 91-20-2566-1513
France - Paris
Tel: 33-1-69-53-63-20
Fax: 33-1-69-30-90-79
Japan - Yokohama
Tel: 81-45-471- 6166
Fax: 81-45-471-6122
Germany - Munich
Tel: 49-89-627-144-0
Fax: 49-89-627-144-44
Atlanta
Alpharetta, GA
Tel: 770-640-0034
Fax: 770-640-0307
Boston
Westborough, MA
Tel: 774-760-0087
Fax: 774-760-0088
Chicago
Itasca, IL
Tel: 630-285-0071
Fax: 630-285-0075
Dallas
Addison, TX
Tel: 972-818-7423
Fax: 972-818-2924
Detroit
Farmington Hills, MI
Tel: 248-538-2250
Fax: 248-538-2260
Kokomo
Kokomo, IN
Tel: 765-864-8360
Fax: 765-864-8387
Los Angeles
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Tel: 949-462-9523
Fax: 949-462-9608
Santa Clara
Santa Clara, CA
Tel: 408-961-6444
Fax: 408-961-6445
Toronto
Mississauga, Ontario,
Canada
Tel: 905-673-0699
Fax: 905-673-6509
Australia - Sydney
Tel: 61-2-9868-6733
Fax: 61-2-9868-6755
China - Beijing
Tel: 86-10-8528-2100
Fax: 86-10-8528-2104
China - Chengdu
Tel: 86-28-8665-5511
Fax: 86-28-8665-7889
Korea - Gumi
Tel: 82-54-473-4301
Fax: 82-54-473-4302
China - Fuzhou
Tel: 86-591-8750-3506
Fax: 86-591-8750-3521
Korea - Seoul
Tel: 82-2-554-7200
Fax: 82-2-558-5932 or
82-2-558-5934
China - Hong Kong SAR
Tel: 852-2401-1200
Fax: 852-2401-3431
Malaysia - Penang
Tel: 60-4-646-8870
Fax: 60-4-646-5086
China - Qingdao
Tel: 86-532-8502-7355
Fax: 86-532-8502-7205
Philippines - Manila
Tel: 63-2-634-9065
Fax: 63-2-634-9069
China - Shanghai
Tel: 86-21-5407-5533
Fax: 86-21-5407-5066
Singapore
Tel: 65-6334-8870
Fax: 65-6334-8850
China - Shenyang
Tel: 86-24-2334-2829
Fax: 86-24-2334-2393
Taiwan - Hsin Chu
Tel: 886-3-572-9526
Fax: 886-3-572-6459
China - Shenzhen
Tel: 86-755-8203-2660
Fax: 86-755-8203-1760
Taiwan - Kaohsiung
Tel: 886-7-536-4818
Fax: 886-7-536-4803
China - Shunde
Tel: 86-757-2839-5507
Fax: 86-757-2839-5571
Taiwan - Taipei
Tel: 886-2-2500-6610
Fax: 886-2-2508-0102
China - Wuhan
Tel: 86-27-5980-5300
Fax: 86-27-5980-5118
Thailand - Bangkok
Tel: 66-2-694-1351
Fax: 66-2-694-1350
Italy - Milan
Tel: 39-0331-742611
Fax: 39-0331-466781
Netherlands - Drunen
Tel: 31-416-690399
Fax: 31-416-690340
Spain - Madrid
Tel: 34-91-708-08-90
Fax: 34-91-708-08-91
UK - Wokingham
Tel: 44-118-921-5869
Fax: 44-118-921-5820
China - Xian
Tel: 86-29-8833-7250
Fax: 86-29-8833-7256
10/19/06
DS21935C-page 32
© 2006 Microchip Technology Inc.
Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
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