SX8743 Datasheet

SX8733/SX8743/SX8744
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Precision Diode Digital Temperature
For Up To 3 External Sensors
SX8733
P1
1
AL1 AL2
6
P2
5
VDD
4
SMBCLK
D2-
SMBDAT
VDD
SX8743
1
3
8
+ ADC
-
SMBUS
SMBCLK
VDD
SX8744
1
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
AL1 AL2
ed
2 D2+
MUX
VSS
+
+
-
P3
2
P1
4
+-
+ ADC
-
SMBUS
7
SMBDAT
P1
2
6
P4
P2
3
5
VSS
NC
4
+-
D2+
D2-
+
-
8
SMBCLK
7
SMBDAT
6
P4
5
VSS
AL1 AL2
ALARM
D1+
D1-
MUX
3
++-
MUX
P2
ALARM
D1+
D1D2+
D2D3+
D3-
fo
r
ALARM
D1+
D1-
+ ADC
-
SMBUS
General Description
Key Product Features
The SX8733, SX8743 and SX8744 are digital temperature
sensors with a 2-wire SMBus interface. It provides a lowcost solution to monitor the temperature of remote diodes
as well as its own temperature with an on-chip PN junction
sensor.
2 Temp. Output Formats: 0°C to 127°C and -40°C to
140°C With 0.125°C Resolution
Depending on the device version, 2, 3 or 4 programmable
ports are included. They offer the possibility to trig under- /
over- temperature alarms which can be used as an interrupt
or to connect up to 3 external sensors in single-ended
mode or 2 external sensors in differential mode.
Parasitic Series Resistance Cancellation: Algorithmic, 3point and Kelvin (4-wire)
Under-/ Over- Temp. Alarms With Programmable
Thresholds
Programmable Conversion Rate For Optimal Power
Consumption
250 uA Active Current @ 10Hz Sampling Rate
V
The parasitic resistances in series with the temperature
monitoring diode can be cancelled by an algorithmic, a 3point or a Kelvin (4-wire) method.
The SX8744 is pin-to-pin compatible with the LM86 part.
The SX8733 (2 programmable ports) is available in MLPD6 package. The SX8743 (4 programmable ports) and
SX8744 (3 programmable ports) are available in MSOP-8
package.
Applications
Printer
Server
Set Top Box
Projector
1 Internal and Up To 3 External Sensors
Remote Diode Temp. Accuracy of ±0.5°C on the Temp.
Range 25°C to 100°C
SMBus v2.0 Interface Supports TIMEOUT
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Product
Ordering Information
Part Number
Feature
Package
SX8733EWLTRT
2 Programmable ports
MLPD-6
SX8743EMSTRT
4 Programmable ports
MSOP-8
SX8744EMSTRT
3 Programmable ports
MSOP-8
Batteries charger monitoring
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 1
www.semtech.com
SX8733/SX8743/SX8744
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
Page
1.
Electrical Characteristics ......................................................................................................................................... 3
4.
Absolute Maximum Ratings ............................................................................................................................. 3
1.3.
Electrical Specification ..................................................................................................................................... 4
1.4.
SMBus Timing Characteristics......................................................................................................................... 5
1.5.
SMBus Timing Waveforms .............................................................................................................................. 5
fo
r
1.2.
Pin Configuration ..................................................................................................................................................... 6
2.1.
Pinout............................................................................................................................................................... 6
2.2.
Pin Description................................................................................................................................................. 6
ed
3.
Sensor Temperature Definition ........................................................................................................................ 3
Configuration ........................................................................................................................................................... 7
3.1.
General Presentation ....................................................................................................................................... 7
3.2.
Modes .............................................................................................................................................................. 7
3.3.
Differential and Single-Ended External Sensor.............................................................................................. 10
3.4.
Measurement Principle .................................................................................................................................. 10
3.5.
Parasitic Track Resistance Cancellation........................................................................................................ 10
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
2.
1.1.
3.5.1.
Algorithmic Track Resistance Cancellation............................................................................................ 10
3.5.2.
3-Point Track Resistance Cancellation ................................................................................................... 10
3.5.3.
The Kelvin (4-wire) Track Resistance Cancellation ................................................................................ 11
3.6.
Temperature Acquisition Sequence............................................................................................................... 11
3.7.
Alarm.............................................................................................................................................................. 12
3.8.
Temperature Data Format ............................................................................................................................. 12
3.9.
Continuous Time Vs. Single Shot .................................................................................................................. 13
Application Note .................................................................................................................................................... 13
4.1.
Typical Temperature Sensing System With A SX8743.................................................................................. 13
5.
Power-Up Sequence and Standby Mode .............................................................................................................. 14
6.
Serial Interface ...................................................................................................................................................... 14
7.
8.
6.1.
Register Write - Combined Format ................................................................................................................ 14
6.2.
Register Write - Direct Format ....................................................................................................................... 14
6.3.
Register Read - Combined Format ................................................................................................................ 15
6.4.
Register Read - Direct Format ....................................................................................................................... 15
6.5.
Soft Reset ...................................................................................................................................................... 15
Register / Memory Map ......................................................................................................................................... 16
7.1.
Memory Map .................................................................................................................................................. 16
7.2.
Registers Description..................................................................................................................................... 16
Packaging Information ........................................................................................................................................... 20
8.1.
MLPD-W6-EP2 Package Outline Drawing..................................................................................................... 20
8.2.
MLPD-W6-EP2 Land Pattern Drawing........................................................................................................... 21
8.3.
Package Outline Drawing: MSOP-8............................................................................................................... 22
8.4.
Land Pattern Drawing: MSOP-8 .................................................................................................................... 23
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 2
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
1. Electrical Characteristics
1.1. Sensor Temperature Definition
Parameter
Symbol
TJ
External diode temperature (remote diode junction temperature)
TD
fo
r
Local sensor diode temperature (chip junction temperature)
1.2. Absolute Maximum Ratings
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
ed
Stresses above the values listed below may cause permanent device failure. Exposure to absolute maximum ratings for
extended periods may affect device reliability. Operation outside the parameters specified in the Electrical Characteristics
section is not implied.
Parameter
Symbol
Conditions
Min
Max
Unit
Power supply to VSS
VDD,ABSMAX
-0.5
5.75
V
Storage temperature
TJ,STORE
-50
150
°C
Ambient operating temperature
TJ,ABSMAX
-40
140
°C
Input voltage on programmable
pin
VPIN,ABSMAX
P1, P2, P3, P4
-0.5
VDD + 0.25
V
Input voltage on SMBUS pin
VPIN,SMBUS
SMBCLK, SMBDAT
-0.5
5.75
V
Input current on any pin
IPIN,ABSMAX
-10
10
mA
Peak reflow temperature
TPKG
260
°C
Latchup
ILUP
100
mA
2
kV
ESD
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
-100
HBM
Human Body Model
MM
Machine Model
200
V
CDM
Charged Device Model
500
V
Page 3
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
1.3. Electrical Specification
All values valid within the operating conditions unless otherwise specified.
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
2.7
3.3
5.5
V
125
°C
250
400
uA
10
40
uA
Power supply
VDD
TJ
Operating temperature =
Junction temperature
Active current
IVDD,ACTIVE
10 Hz sampling rate
No track cancellation mode
Current in standby mode
IVDD,STDBY
Operating temperature
-40
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
ed
Current Consumption
fo
r
Operating Conditions
Temperature to Digital Converter
Temperature resolution
TRESOL
0.125
°C
TD,ERR1
TJ = 25°C to 85°C
TD = 25°C to 100°C
-1.5
±0.5
1.5
°C
TD,ERR2
TJ = 25°C to 85°C
TD = - 40°C to 125°C
-3
±1.5
3
°C
TJ,ERR1
TJ = 25°C to 85°C
-2
±0.75
2
°C
TJ,ERR2
TJ = - 40°C to 125°C
±1.5
°C
tCONV
10Hz sampling rate
100
ms
I2
High level
100
uA
I1
Low level
10
uA
Alarm output low voltage
VOL,AL
IOL< 4mA
Leakage current
ID,LEAK
Standby mode
Remote temperature error1
Local temperature error1
Conversion time
Remote-diode source current
-1
0.4
V
1
uA
SMBus - Compatible Interface SMBCLK & SMBDAT
Input logic high
VIH
Input logic low
VIL
Output logic low
VOL
Current leakage on SMBCLK/
SMBDAT
ILEAK,SMB
Capacitive load on SMBCLK/
SMBDAT
CBUS
2.1
V
IOL< 4mA
-1
5
0.8
V
0.4
V
1
uA
pF
1. Specification with VDD=3.0V to 3.6V and track resistance cancellation disabled.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 4
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
1.4. SMBus Timing Characteristics
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
400
kHz
fSMB
10
SMBus clock low time
tLOW
1.3
us
SMBus clock high time
tHIGH
0.6
us
SMBus rise time
tR,SMB
SMBus fall time
tF,SMB
ed
SMBDAT and SMBCLK time low
for reset of serial interface
fo
r
SMBus clock frequency
tTIMEOUT
Data setup time
tSU,DAT
Data hold time1
25
300
ns
300
ns
35
ms
ns
tHD,DAT
0
ns
Start condition hold time
(SMBDAT low to SMBCLK low)
tHD,STA
0.6
us
Stop condition hold time
(SMBCLK high to SMBDAT high)
tSU,STO
0.6
us
Repeated start-condition setup
time
(SMBCLK high to SMBDAT low)
tSU,STA
0.6
us
tBUF
1.3
us
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
100
SMBus free time between stop
and start conditions
1. The device provides a hold time of at least 300ns for the SMBDAT signal to bridge the undefined region of the falling edge of SMBCLK.
1.5. SMBus Timing Waveforms
SMBDAT
SMBCLK
tSU,STA
tHD,STA
tLOW
tHIGH
tHD,DAT
Start
tSU,DAT
tSU,STO
tBUF
Stop
Figure 1. SMBUS Timing
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 5
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
2. Pin Configuration
2.1. Pinout
SX8744
VDD
P3
P2
P1
VSS
P4
SMBDAT
SMBCLK
VDD
P1
P2
NC
VSS
P4
SMBDAT
SMBCLK
fo
r
1
2
3
4
5
6
7
8
SX8743
ed
SX87331
P1
VSS
SMBDAT
SMBCLK
VDD
P2
-
Pin #
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
1. MLPD exposed pad is not connected internally. It is connected to ground plane for
thermal dissipation
Table 1 Pinout
2.2. Pin Description
Pin
Type
SMBCLK
SMBDAT
VDD
VSS
DIGITAL
DIGITAL
POWER
POWER
Description
SMBus serial clock input, open drain
SMBus serial data input/output, open drain
Positive power supply
Negative power supply
Table 2 Power and SMBus Pin Description
Pin
P1
P2
P3
P4
VSS
Type
Description
ANALOG
DIGITAL
ANALOG
Ext. diode current source
Alarm output, pseudo-open drain
Ext. diode current source
ANALOG
Ext. diode return current sink
DIGITAL
ANALOG
Alarm output, pseudo-open drain
Ext. diode current source
ANALOG
Ext. diode return current sink
DIGITAL
ANALOG
Alarm output, pseudo-open drain
Ext. diode return current sink
DIGITAL
POWER
0
2
1
D1+ D1+
3
Mode
4
6
8
11
13
16
10
15
18
20
5
7
9
12
14
17
D1+ D1+ D1+ D1+ D1+ D1+ D1+ D1+ D1+ D1+
AL1
D2+
D1- D1-
AL2
D1-
D1-
D1-
D1-
AL1
D2+ D2+
D3+ D3+ D1+
D1D2-
AL1 AL1
D2-
Alarm output, pseudo-open drain
Ext. diode return current sink
D2+ D2+ D2+
AL2 AL2
D1-
D1D2-
D1-
D1-
D1D1AL1 AL1 D2D3D1- D1D1- D1D2- D2D2- D2D3- D3-
Table 3 Programmable Pin Description
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 6
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
3. Configuration
3.1. General Presentation
SX8733 / SX8743 / SX8744 include an onchip PN junction to measure local temperaAL1
ture TJ.
AL2
6
P1
P2
P3
2
D1+
D1D2+
+
+
-
P4
+
ADC
-
+
-
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
D3+
D3-
MUX
6
The device has a 2-level current source
and an ADC to measure each diode’s
forward
voltage
to
compute
the
temperature. The input multiplexer allows 3
external and 1 internal sensors to be
connected to the ADC.
ALARM
D2-
6
fo
r
3
1
DECODER
3
2
ed
4
SMBUS
SMBCLK
4
8
SMBDAT
3
7
VDD
5
1
VSS
2
5
SX8733
SX8744
SX8743
Two alarms can provide to the system the
information that a sensor temperature has
reached the programmable threshold.
The chip is configured with a 2-wire
SMBUS serial line.
The functional
Figure 2.
diagram
is
shown in
Figure 2. Functional Diagram
3.2. Modes
The mode set in RegConfig allows numerous circuit configurations described in Figure 3 and Figure 4.
Up to 3 external sensors can be connected. Theses are configured with differential or single-ended connections.
Some modes provide a track resistance cancellation feature to decrease temperature inaccuracy linked to long PCB traces
connecting the external sensor to the chip. This is set in RegControl (bits Point3 or Algo). Table 4 presents the mode for the
SX8743.
Mode
External sensor
Differential
Single-ended
Algorithmic track resistance cancellation
3-point track resistance cancellation
Kelvin (4-wire) track resistance cancellation
Alarm #
0
1
x
1
1
x
2
1
3
0
x
4
2
5
2
6
1
7
1
x
x
x
x
x
x
0
1
x
8
1
x
9
1
x
x
x
0
0
0
2
0
1
2
2
10 11 12 13 14 15 16 17 18 20
1 2 2 2 2 2 3 3 3 1
x x
x
x
x x x x x x
x
x
x
x
x
x
x
2 0 0 2 2 1 1 1 0 0
Table 4 Features Available With SX8743
Due to their limited number of ports, SX8733 and SX8744 do not offer all theses features. SX8733 does not provide ports
P3 and P4 so modes 8 to 20 should not be used. Also port P3 is not available on SX8744 and this typically reduces the
number of alarm or the number of external sensors.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 7
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
P1
P1
Mode 0, Mode 1
Mode 2
ed
VDD
P1
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
P1
P2
TD1
P2
ALARM1
TD2
VSS
ALARM2
Mode 3
Mode 4, Mode 5
P1
P1
TD1
VSS
fo
r
TD1
P2
TD1
P2
P2
TD1
VDD
VDD
P2
P3
ALARM1
P4
ALARM2
ALARM1
Mode 8, Mode 9
Mode 6, Mode 7
P1
P1
TD1
P2
P2
VDD
TD1
P3
P3
ALARM1
P4
ALARM2
P4
TD2
Mode 11, Mode 12
Mode 10
Figure 3. Mode Connection Diagrams (Modes 0 to 12)
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 8
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
P1
P1
TD1
P2
TD1
P2
VDD
TD2
TD2
fo
r
P3
VSS
VDD
P3
ALARM1
P4
ALARM1
ed
P4
ALARM2
Mode 15
P1
P1
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
Mode 13, Mode 14
TD1
P2
P2
TD2
P3
P3
TD3
VSS
P4
VDD
P4
TD1
TD2
TD3
ALARM1
Mode 18
Mode 16, Mode 17
P1
TD1
P2
P3
P4
Mode 20
Figure 4. Mode Connection Diagrams (Modes 13 to 18 and 20)
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 9
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
3.3. Differential and Single-Ended External Sensor
Table 4 indicates whether the external sensors are connected differentially or in single-ended configuration with grounded
cathode.
Differential modes have better common-mode rejection of external noise pickup. The external noise pickup is present
equally on the anode and the cathode therefore differential noise is minimized.
fo
r
Single-ended modes allow more sensors to be connected to the chip but they are more prone to noise pickup since the
cathode is connected to a common VSS and, therefore, any external noise pickup tends to be developed mainly across the
anode which will be measured as temperature noise.
A filtering capacitor is recommended to decrease measurement noise especially if the external sensor is connected to the
chip by a long trace. A capacitor with a value of 100 pF should be placed as close as possible to the chip pins.
ed
3.4. Measurement Principle
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
The circuit uses the intrinsic thermal property of a diode to measure temperature. Temperature is calculated by measuring
the base-emitter voltage of a transistor. Two different currents are sourced to the diodes. The base-emitter voltage is
measured in each case. With a fixed current ratio, temperature is accurately calculated by measuring the difference in the
base-emitter voltage at the two currents.
The excitation current I2 of 100uA is passed through the diode first. The base-emitter voltage of the transistor is measured
by the ADC. The measurement is then repeated using the excitation current divided by a fixed value. This current I1 has a
value of 10uA. The following equation relates the VBE difference voltage with current and temperature T where:
k is the Boltzmann’s constant (1.381 x 10-23 J/K)
q is the charge on the electron (1.602 x 10-19 Cb).
Tabs is the absolute temperature in Kelvins. (Tabs=273.15 + T
where T is the temperature in Celsius).
n is the pn junction ideality factor (1.00 for an ideal diode)
For a current ratio I2/I1=10 and an ideality factor n=1.010, this gives a
fixed relationship between ∆VBE and temperature of 200uV/ºC. The
voltage is then converted to digital with an ADC.
kT abs I 2
∆V BE = V BE2 – V BE1 = n ⋅ ------------- ln  ----
q
I1
3.5. Parasitic Track Resistance Cancellation
The temperature measurement method described previously assumes
a very low series impedance in the sensor path.With a typical ∆VBE
around 200uV/ºC and the ∆I=I2-I1=90uA, 1 ohm of parasitic resistance
in the sensor path gives approximately 0.45ºC of temperature error.
This may result in a significant error if the external sensor is located
some distance away from the chip. Track resistance cancellation
schemes decrease temperature error due to high resistance in the
tracks from the device to the sensors.
I2 – I1
∆T Rtrack = R Track ⋅ -----------------------200uV ⁄ C
3.5.1. Algorithmic Track Resistance Cancellation
The use of the algorithmic track resistance cancellation allows automatic cancellation of resistances in series with the
temperature diode by using current modulation to bias the external diode. This is done transparently to the user. This
method may cancel up to 1 kOhm of series resistance. The best accuracy is in the TD range 20ºC to 70ºC.
3.5.2. 3-Point Track Resistance Cancellation
The 3-point track resistance cancellation requires one additional connection to the external PN junction so that an
additional current source can be used to cancel out the error voltage due to the track resistance.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 10
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Track resistances up to 1 kOhm may be cancelled. It is important that the track resistance values in the cathode or anode
path of the external sensor are made equal. Care must be taken during PCB layout to match track resistances between the
device and the sensor. Any resistance difference will lead to cancellation errors.
In this mode, VSS is used for the current return path from the cathode. This connection must be placed close to the diode’s
cathode. One port supply the current modulation to the anode and another port supply the cancellation current to the
cathode. The resulting junction voltage modulation is measured between the 2 used ports. Figure 5 explains the method:
V2
I
P2
V1
2I
The voltages developed on P1 and P2 traces are the same
therefore the differential voltage seen on P1-P2 is not impacted by
the track resistance.
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
VSS
fo
r
V1
Assume sensor Q1 is being measured in mode 2 with 3-point
track resistance cancellation enabled. The PCB trace linking the
device to the external sensor must be matched which means the
PCB track resistance are the same. The same current is forced
out of P1 and P2.
ed
I
P1
Figure 5. 3-Point Track Resistance Cancellation
3.5.3. The Kelvin (4-wire) Track Resistance Cancellation
P1
P2
P3
The sensor is connected to the chip via 4 wires. Two comes from
the current source (force : P3, P4) and two are used for the
voltage measurement (sense : P1, P2).
Sense (+)
Sense (-)
Force (+)
The Kelvin connection avoids the measurement error caused by
the voltage drop in the force path.
I
I
P4
Sense leads are attached directly accross the external sensor.
The P1 and P2 connections must be as close as possible to
sensor anode and cathode respectively.
Force (-)
Figure 6. Kelvin (4-wire) Track Resistance Cancellation
3.6. Temperature Acquisition Sequence
The SX8743 monitors up to 4 sensors (3 remote and 1 internal). Theses can be scanned in sequence to make an
automatic reading of the sensors one after the other. The result of each conversion is stored in the temperature registers
(see Table 6). The register RegSensor defines which sensors are scanned in the sequence. When all the sensors are
selected, the sequence is the following: Int→ Ext1→ Ext2→ Ext3→Int→etc.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 11
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
3.7. Alarm
VDD
fo
r
ALARM
Alarm threshold registers (RegAlarm1 and RegAlarm2) contain the value the user wishes
the alarms to trip on. The alarm data format is the same as the temperature data format
which is set in RegControl (bit TempOffsetMode). In other words, in binary mode alarm
value is set in degree; in offset binary mode alarm is set in with an offset of 64.
The alarm calculation is performed at the end of the temperature sensing cycle.
Therefore, if TempOffsetMode bit or alarm values are changed, a temperature sensor
measurement must be run to update the alarm outputs.
ed
VSS
Depending on the selected mode, the chip can have two alarm outputs: Alarm1 and
Alarm2. If the external or internal temperature exceeds or goes under a programmed
temperature threshold, the alarm is activated. Any remote or local sensor may be
selected to trigger Alarm1 and Alarm2.
Figure 7. Alarm Output Internal Simplified Schematics
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
The pseudo-open drain output shown in Figure 7 requires a pull-up resistor connected to VDD. It allows connection to a
GPIO, a system shutdown or other thermal management circuitry.
The alarm polarity can be set active low or high
and, the over or under temperature can also be
set with RegAlarmSet register.
Temperature
Alarm threshold
Hysteresis
Remote or local
temperature
Alarm(1 or 2)
To prevent alarm outputs to trig constantly when
the
limit
temperature
is
reached,
the
RegAlarmHyst register holds a hysteresis value.
The alarm remains active while the temperature is
superior to the alarm threshold minus the value
programmed in the RegAlarmHyst register (for a
trig on over-temperature) as described on
Figure 8.
Over-temperature
Time
Figure 8. Alarm Output
3.8. Temperature Data Format
Temperature output code from the internal and external sensors are made of 2 bytes. The temperature high byte has an
LSB representing 1ºC and contains the integer part of the temperature while the low byte contains the fractional value with
a resolution of 0.125ºC.
The SX8733 has 2 temperature data formats. By default, the format is binary and the measurement range is from 0ºC to
127ºC. To extend the measurement range to -40ºC to +140ºC, an offset of 64ºC is added to the binary code.
When a conversion is complete, the main temperature register and the extended temperature register are updated
simultaneously. Ensure that no conversions are completed between reading the main register and the extended register,
so that both registers contain the result of the same conversion.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 12
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Temperature High Byte
Temperature (ºC)
Offset Binary
0001 1000
1
Binary or
Offset Binary
Temperature (ºC)
0100 0000
x.000
0000 0000
1
0000 0001
0100 0001
x.125
0000 0001
50
0011 0010
0111 0010
x.250
0000 0010
64
0100 0000
0000 0000
x.375
0000 0011
100
0110 0100
1010 0100
127
0111 1111
1011 1111
140 or more
0111 11113
1100 1100
Diode fault
1111 11114
1111 11114
fo
r
0
0000 00002
0000 0000
x.500
0000 0100
x.625
0000 0101
x.750
0000 0110
x.875
0000 0111
ed
-40 or less
Offset binary scale temperature values are offset by 64ºC
Binary scale returns 0ºC for all temperatures <0ºC
Binary scale returns 127ºC for all temperatures >127ºC
A diode fault is detected when the temperature ADC hard limits at 0% or 100% pulse density
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
1.
2.
3.
4.
Temperature Low Byte
Binary
3.9. Continuous Time Vs. Single Shot
The chip can be operated in 2 distinct modes: continuous time or one-shot.
The one-shot mode performs one temperature measurement of all sensors selected in RegSensor. After completion, it
returns to standby.
In continuous temperature sampling, temperature measurements are taken at regular intervals and the result held in
internal registers accessible by SMBUS. The RegADCRate register controls the sampling time period.
4. Application Note
4.1. Typical Temperature Sensing System With A SX8743
VBUS
10k
3.3V
1
10k
7
SMBus
Interface
8
100nF
VDD
SMBDAT
SMBCLK
P1
4
SX8743
HOST
10k
GPIO
100pF
P2 3
10k
ALARM1
2
ALARM2
6
MMBT3906
P3
P4
VSS
5
VSS
Figure 9. SX8743 Performs Remote Temperature Measurement In Mode 8
When the remote-sensing diode is a discrete transistor, its collector and base should be connected together. An external
capacitor of 100pF across the PN junction smoothes out external noise interference. The capacitor must be located very
close to the pins.
The ideality factor is a measure of the deviation of the thermal diode from ideal behavior. The chips are trimmed for the
PNP device described in Table 5.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 13
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
A different ideality factor causes a change in the slope of the linear
equation ∆VBE=f(T).
n nom
∆T nfact =  --------------- – 1 ⋅ ( T D + 273.15 )
 n actual 
Gain and offset can be adjusted with the registers RegExtGain and
RegExtOffset to compensate for small variations in n. Large power
transistors must not be used.
Manufacturer
Package
MMBT3906
Fairchild
SOT23-3
Table 5 Recommended device
ed
5. Power-Up Sequence and Standby Mode
fo
r
Part Number
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
At power-up, the device is in one-shot mode waiting for an SMBUS command to start conversion. The measurement
interval and the alarm thresholds will default to a set value at power-up but may be reconfigured to different values with
SMBUS command.
Between temperature measurements, to decrease power consumption, the chip will shut down into its low-power standby
state with most functions disabled.
6. Serial Interface
6.1. Register Write - Combined Format
Write to single register (combined format)
SA SA SA
2
1
0
Slave address 0x4C
WD WD WD WD WD WD WD WD
7
6
5
4
3
2
1
0
R/
W
Write Data
Stop by Master
Register Address
SA SA
4
3
Slave ACK driven
by SX8733
R/
W
Slave address 0x4C
SA SA
6
5
Slave ACK driven
by SX8733
RA RA RA RA RA RA RA RA
7
6
5
4
3
2
1
0
Restart by Master
SA SA
1
0
Slave ACK driven
by SX8733
SA SA
3
2
Slave ACK driven
by SX8733
Start by Master
SA SA SA
6
5
4
6.2. Register Write - Direct Format
Write to single register (direct format)
SA2
SA1
Slave address 0x4C
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
SA0
RA7
R/W
RA6
RA5
RA4
RA3
RA2
Register Address
Page 14
RA1
RA0
WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0
Write Data
Stop by Master
SA3
Slave ACK driven
by SX8733
SA4
Slave ACK driven
by SX8733
SA5
Slave ACK driven
by SX8733
Start by Master
SA6
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
6.3. Register Read - Combined Format
Read from single register (combined format)
SA
2
SA
1
Slave address 0x4C
SA
0
RD RD RD RD RD RD RD RD
7
6
5
4
3
2
1
0
R/
W
Read data driven by SX8733
Stop by Master
SA
3
NACK driven by
master
Register Address
SA
4
Slave ACK driven
by SX8733
R/
W
Slave address 0x4C
SA SA
6
5
fo
r
RA RA RA RA RA RA RA RA
7
6
5
4
3
2
1
0
ed
SA
0
Restart by Master
SA SA
2
1
Slave ACK driven
by SX8733
SA SA
4
3
Slave ACK driven
by SX8733
Start by Master
SA SA
6
5
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
6.4. Register Read - Direct Format
Read from single register (short format)
Read data driven by SX8733
Stop by Master
R/
W
Slave address 0x4C
NACK driven by
master
RD RD RD RD RD RD RD RD
7
6
5
4
3
2
1
0
Slave ACK driven
by SX8733
Start by Master
SA SA SA SA SA SA SA
6
5
4
3
2
1
0
6.5. Soft Reset
The user may reset the circuit via SMBus by sending a general call address at slave address 0x00 followed by the reset
command 0x06. In other words, as illustrated in the figure below, a soft reset can be generated by sending a command at
slave address 0x00 (rather than the regular 0x4C slave address) to IC register address 0x06 with any data (0xXX).
The soft reset command sets the circuit and registers in the same state as after a power-up.
Reset
SA2
SA1
Slave address
0x00
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
SA0
RA7
R/W
RA6
RA5
RA4
RA3
RA2
Register Address
0x06
Page 15
RA1
RA0
WD7 WD6 WD5 WD4 WD3 WD2 WD1 WD0
Write Data
0xXX
Stop by Master
SA3
Slave ACK driven
by SX8733
SA4
Slave ACK driven
by SX8733
SA5
Slave ACK driven
by SX8733
Start by Master
SA6
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
7. Register / Memory Map
Each register is described in the following register memory map. These are identified by a Register Name and
corresponding hexadecimal register address.
7.1. Memory Map
RegIntTempLSB
TJ temperature reading for internal sensor, fractional part, LSB = 0.125ºC
0x22
0x23
0x24
RegSensor
RegAlarm1
RegAlarm2
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
ed
RegConfig
RegExtGain
RegExtOffset
RegDeviceID
RegDeviceVersion
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
0x00
0x06
0x07
0x20
0x21
fo
r
RegIntTempMSB
Identification Registers
Determines the chip variant and the communication interface (I2C or SMBus)
Sets the calibration gain for remote temperature measurement
Sets the calibration offset for remote temperature measurement
Read-only ID = 0x33
Read-only circuit revision
Configuration Registers
Defines which sensors are scanned in sequence
Alarm1 threshold
Alarm2 threshold
Defines which sensors control alarms 1 and 2, and whether over-/under- temperature triggers for
each alarm
Alarm hysteresis
Temperature conversion rate
Temperature Registers
TJ temperature reading for internal sensor, integer part, LSB = 1ºC
RegAlarmSet
RegAlarmHyst
RegADCRate
RegExtTemp1MSB
TD1 temperature reading for external sensor 1, integer part, LSB = 1ºC
RegExtTemp1LSB
TD1 temperature reading for external sensor 1, fractional part, LSB = 0.125ºC
RegExtTemp2MSB
TD2 temperature reading for external sensor 2, integer part, LSB = 1ºC
RegExtTemp2LSB
TD2 temperature reading for external sensor 2, fractional part, LSB = 0.125ºC
RegExtTemp3MSB
TD3 temperature reading for external sensor 3, integer part, LSB = 1ºC
RegExtTemp3LSB
TD3 temperature reading for external sensor 3, fractional part, LSB = 0.125ºC
General Registers
General Control register
General Status register
RegControl
RegStatus
Table 6 Memory map
7.2. Registers Description
Addr: 0x00 RegConfig
Bits
Name
Mode
Reset
Reserved
rw
00
5
SetInterface
rw
1
4:0
Mode
rw
00000
7:6
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Description
Write to 00
Select between I2C or SMBus interface
0: I2C (Time Out Disabled)
1: SMBUS
Select the configuration mode
00000: Mode 0
00001: Mode 1
...
10010: Mode 18
10100: Mode 20
Page 16
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Addr: 0x06 RegExtGain
Bits
Name
Mode
Reset
7:6
Reserved
rw
00
5:0
ExtGain
rw
xxxxxx
Bits
Name
Mode
Reset
7:0
ExtOffset
rw
xxxxxxxx
Bits
Name
Mode
Reset
7:4
Reserved
rw
0000
Description
Write to 00
Gain adjustement for external temperature measurement
Do not write to avoid production calibration altering
Addr: 0x07 RegExtOffset
Addr: 0x22 RegSensor
rw
0
2
SelExt2
rw
0
1
0
ed
SelExt3
Write to 0000
0: External sensor 3 not in temp. scan sequence
1: Enable external sensor 3 to be in temp. scan sequence
0: External sensor 2 not in temp. scan sequence
1: Enable external sensor 2 to be in temp. scan sequence
0: External sensor 1 not in temp. scan sequence
1: Enable external sensor 1 to be in temp. scan sequence
0: Internal sensor not in temp. scan sequence
1: Enable internal sensor to be in temp. scan sequence
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
3
Description
fo
r
Description
Offset adjustement for external temperature measurement.
Do not write to avoid production calibration altering
SelExt1
rw
0
SelInt
rw
1
Name
Mode
Reset
Threshold1
rw
01000000
Name
Mode
Reset
Threshold2
rw
01000000
Name
Mode
Reset
Reserved
rw
0
AlarmPolarity
rw
0
Direction2
rw
0
Direction1
rw
0
Addr: 0x23 RegAlarm1
Bits
7:0
Description
Alarm1 temperature threshold. The data is coherent with the binary and offset format.
1LSB=1ºC
Addr: 0x24 RegAlarm2
Bits
7:0
Description
Alarm2 temperature threshold. The data is coherent with the binary and offset format.
1LSB=1ºC
Addr: 0x25 RegAlarmSet
Bits
7
6
5
4
Description
Write to 0
0: Alarm1, Alarm2 outputs active high
1: Alarm1, Alarm2 outputs active low
0: Trigger on over-temperature for Alarm2
1: Trigger on under-temperature for Alarm2
0: Trigger on over-temperature for Alarm1
1: Trigger on under-temperature for Alarm1
Select2
rw
00
00: External 1 sensor controls Alarm2
01: External 2 sensor controls Alarm2
10: External 3 sensor controls Alarm2
11: Internal sensor controls Alarm2
Select1
rw
11
00: External 1 sensor controls Alarm1
01: External 2 sensor controls Alarm1
10: External 3 sensor controls Alarm1
11: Internal sensor controls Alarm1
Bits
Name
Mode
Reset
Description
7:4
Hysteresis2
rw
0100
Defines Alarm2 hysteresis with 1ºC resolution. (0 to 15ºC)
3:0
Hysteresis1
rw
0100
Defines Alarm1 hysteresis with 1ºC resolution. (0 to 15ºC)
3:2
1:0
Addr: 0x26 RegAlarmHyst
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 17
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Addr: 0x27 RegADCRate
Bits
Name
Mode
Reset
7:5
Reserved
rw
000
OneShot
rw
0
3
Regular
rw
0
Rate
rw
Temperature sampling rate
000: 0.1 second (continuous sampling)
001: 0.25 second
010: 0.50 second
011: 1 second
100: 2 seconds
101: 4 seconds
110: 8 seconds
111: 16 seconds
000
ed
2:0
Write to 000
0: Standby
1: Perform one temperature measurement
0: Disable continuous temperature sampling
1: Enable continuous temperature sampling
fo
r
4
Description
Bits
7:0
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
Addr: 0x28 RegIntTempMSB
Name
Mode
Reset
IntTempMSB
r
00000000
Name
Mode
Reset
Reserved
r
00000
IntTempLSB
r
000
Name
Mode
Reset
ExtTemp1MSB
r
00000000
Name
Mode
Reset
Reserved
r
00000
ExtTemp1LSB
r
000
Name
Mode
Reset
ExtTemp2MSB
r
00000000
Description
MSB of Internal Temperature TJ. LSB=1ºC
Addr: 0x29 RegIntTempLSB
Bits
7:3
2:0
Description
LSB of Internal Temperature TJ. LSB=0.125ºC
Addr: 0x2A RegExtTemp1MSB
Bits
7:0
Description
MSB of External Temperature TD1. LSB=1ºC
Addr: 0x2B RegExtTemp1LSB
Bits
7:3
2:0
Description
LSB of External Temperature TD1. LSB=0.125ºC
Addr: 0x2C RegExtTemp2MSB
Bits
7:0
Description
MSB of External Temperature TD2. LSB=1ºC
Addr: 0x2D RegExtTemp2LSB
Bits
Name
Mode
Reset
Reserved
r
00000
ExtTemp2LSB
r
000
Name
Mode
Reset
7:0
ExtTemp3MSB
r
00000000
Bits
Name
Mode
Reset
7:3
Reserved
r
00000
2:0
ExtTemp3LSB
r
000
7:3
2:0
Description
LSB of External Temperature TD2. LSB=0.125ºC
Addr: 0x2E RegExtTemp3MSB
Bits
Description
MSB of External Temperature TD3. LSB=1ºC
Addr: 0x2F RegExtTemp3LSB
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Description
LSB of External Temperature TD3. LSB=0.125ºC
Page 18
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Addr: 0x30 RegControl
Name
Mode
Reset
7:5
Reserved
rw
000
4
ClockStretching
rw
1
3
TempOffsetMode
rw
0
2
Point3
rw
0
1
Algo
rw
0
0
Bit0
rw
1
Bits
Name
Mode
Reset
7:4
Reserved
w
0000
3
ExtTemp3End
Description
Write to 000
0: No clock stretching
1: Enable clock stretching
0: Binary mode
1: Offset binary mode
0: Disable 3-point track resistance cancellation
1: Enable 3-point track resistance cancellation
0: Disable algorithmic track cancellation
1: Enable algorithmic track cancellation
This bit must be set to 1
fo
r
Bits
1
0
Write to 0000
w
1
0
1: External temperature 3 conversion complete
0
1: External temperature 2 conversion complete
1
0
1: External temperature 1 conversion complete
1
0
1: Internal temperature conversion complete
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
2
1
Description
ed
Addr: 0x31 RegStatus
ExtTemp2End
w
ExtTemp1End
w
IntTempEnd
w
1. write logic 1 to register bit to clear
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 19
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
8. Packaging Information
A
D
fo
r
8.1. MLPD-W6-EP2 Package Outline Drawing
DIMENSIONS
B
DIM
ed
E
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
PIN 1
INDICATOR
(LASER MARK)
A
aaa C
A1
1
SEATING
PLANE
C
A2
D1
A
A1
A2
b
D
E
D1
E1
e
L
N
aaa
bbb
MILLIMETERS
MIN NOM MAX
0.70 0.75 0.80
0.00 0.02 0.05
(0.20)
0.30 0.40 0.45
2.90 3.00 3.10
2.90 3.00 3.10
2.23 2.38 2.48
1.50 1.65 1.75
0.95 BSC
0.30 0.40 0.50
6
0.08
0.10
2
LxN
E/2
E1
N
bxN
e
bbb
C A B
D/2
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. COPLANARITY APPLIES TO THE EXPOSED PAD AS WELL AS TERMINALS.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 20
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
R
K
ed
fo
r
8.2. MLPD-W6-EP2 Land Pattern Drawing
DIMENSIONS
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
DIM
(C)
G
H
C
G
H
K
P
R
X
Y
Z
Z
Y
X
P
MILLIMETERS
(2.95)
2.20
1.65
2.38
0.95
0.225
0.45
0.75
3.70
NOTES:
1. CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
3. THERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD
SHALL BE CONNECTED TO A SYSTEM GROUND PLANE.
FAILURE TO DO SO MAY COMPROMISE THE THERMAL AND/OR
FUNCTIONAL PERFORMANCE OF THE DEVICE.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 21
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
8.3. Package Outline Drawing: MSOP-8
A
A
A1
A2
b
c
D
E1
E
e
L
L1
N
01
aaa
bbb
ccc
D
2X E/2
E1
.043
.000
.006
.030
.037
.009
.015
.003
.009
.114 .118 .122
.114 .118 .122
.193 BSC
.026 BSC
.016 .024 .032
(.037)
8
0°
8°
.004
.005
.010
ed
N
fo
r
DIMENSIONS
INCHES
MILLIMETERS
DIM
MIN NOM MAX MIN NOM MAX
e/2
E
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
PIN 1
INDICATOR
ccc C
2X N/2 TIPS
1 2
e
B
aaa C
D
H
A2
SEATING
PLANE
C
1.10
0.00
0.15
0.75
0.95
0.22
0.38
0.08
0.23
2.90 3.00 3.10
2.90 3.00 3.10
4.90 BSC
0.65 BSC
0.40 0.60 0.80
(.95)
8
0°
8°
0.10
0.13
0.25
A
A1
bxN
bbb
C A-B D
SIDE VIEW
c
GAGE
PLANE
0.25
SEE DETAIL
L
01
(L1)
DETAIL
A
A
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H-
3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MO-187, VARIATION AA.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 22
www.semtech.com
SX8733/SX8743/SX8744
Precision Diode Digital Temperature
For Up To 3 External Sensors
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
fo
r
8.4. Land Pattern Drawing: MSOP-8
DIM
DIMENSIONS
MILLIMETERS
INCHES
(.161)
.098
.026
.016
.063
.224
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
C
G
P
X
Y
Z
ed
X
(C)
G
Y
Z
(4.10)
2.50
0.65
0.40
1.60
5.70
P
NOTES:
1.
THIS LAND PATTERN IS FOR REFERENCE PURPOSES ONLY.
CONSULT YOUR MANUFACTURING GROUP TO ENSURE YOUR
COMPANY'S MANUFACTURING GUIDELINES ARE MET.
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 23
www.semtech.com
SX8733/SX8743/SX8744
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
ed
fo
r
© Semtech 2010
All rights reserved. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The
information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable
and may be changed without notice. No liability will be accepted by the publisher for any consequence of its use. Publication
thereof does not convey nor imply any license under patent or other industrial or intellectual property rights. Semtech assumes
no responsibility or liability whatsoever for any failure or unexpected operation resulting from misuse, neglect improper
installation, repair or improper handling or unusual physical or electrical stress including, but not limited to, exposure to
parameters beyond the specified maximum ratings or operation outside the specified range.
N
o
N t
ew R
ec
D o
es m
ig m
ns en
d
SEMTECH PRODUCTS ARE NOT DESIGNED, INTENDED, AUTHORIZED OR WARRANTED TO BE SUITABLE FOR USE IN
LIFE-SUPPORT APPLICATIONS, DEVICES OR SYSTEMS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF
SEMTECH PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE UNDERTAKEN SOLELY AT THE CUSTOMER’S
OWN RISK. Should a customer purchase or use Semtech products for any such unauthorized application, the customer shall
indemnify and hold Semtech and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims,
costs damages and attorney fees which could arise.
Contact information
Semtech Corporation Advanced Communications & Sensing Products
E-mail: [email protected]@semtech.comInternet: http://www.semtech.com
USA
200 Flynn Road, Camarillo, CA 93012-8790.
Tel: +1 805 498 2111 Fax: +1 805 498 3804
FAR EAST
12F, No. 89 Sec. 5, Nanking E. Road, Taipei, 105, TWN, R.O.C.
Tel: +886 2 2748 3380 Fax: +886 2 2748 3390
EUROPE
Semtech Ltd., Units 2 & 3, Park Court, Premier Way, Abbey Park Industrial Estate, Romsey, Hampshire, SO51 9DN.
Tel: +44 (0)1794 527 600 Fax: +44 (0)1794 527 601
ISO9001
CERTIFIED
ACS Revision 2.91/February 2010
©2010 Semtech Corp.
Page 24
www.semtech.com