SX8733
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Precision Diode Digital Temperature
For Up To 3 External Sensors
SX8733
P1
1
AL1 AL2
6
P2
5
VDD
ALARM
2 D2+
SMBDAT
VDD
1
P3
2
+ ADC
-
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
D2-
+
+
-
MUX
VSS
D1+
D1-
SX8743
3
4
SMBUS
8
SMBCLK
VDD
1
7
SMBDAT
P1
2
SMBCLK
SX8744
SX
AL1 AL2
P1
4
+++-
+ ADC
-
SMBUS
SMBCLK
7
SMBDAT
6
P4
5
VSS
AL1 AL2
6
P4
P2
3
5
VSS
NC
4
ALARM
D1+
D1-
+-
D2+
D2-
+
-
MUX
X
3
D1+
D1D2+
D2D3+
D3-
MUX
P2
ALARM
8
+ ADC
-
SMBUS
Key
ey
y Product
Produc Features
The SX8733, SX8743 and SX8744 are digital
gitall temperature
temperatu
temperat
sensors with a 2-wire SMBus interface. It provides a lowcost solution to monitor the temperature
ture
e of remot
remote diodes
es
as well as its own temperature with
h an on-chip PN
P junction
nct
sensor.
Depending on the device version,
rsion, 2, 3 or 4 programmable
ogrammable
ammable
ports are included. They offer
to trig underer the possibility
possi
poss
under /
over- temperature alarms
mss which
w h can
ca be
b used
ed as an interrupt
int
inter
or to connect up to 3 external
in single-ended mode
erna sensors
s
or 2 external sensors
differential mode.
ors in differen
N
ot
General Description
The parasitic resistances
esistances iin series with the
he temperature
monitoring diode
ode can be cancelled by an algorithmic, a 3point or a Kelvin
(4-wire) method.
n (4-wir
(4-wire
The SX8744 is pin-to-pin compatible with the LM86 part.
The SX8733 (2 programmable ports) is available in MLPD-6
package. The SX8743 (4 programmable ports) and SX8744
(3 programmable ports) are available in MSOP-8 package.
Applications
Set Top Box
Remo Diode Temp. Accuracy of ±0.5°C on the Temp.
Remote
Range 25°C to 100°C
R
2 Temp.
T
Output Formats: 0°C to 127°C and -40°C to
140°C With 0.125°C Resolution
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
SMBus v2.0 Interface Supports TIMEOUT
Pb-Free, Halogen Free, RoHS/WEEE Compliant
Product
Ordering Information
Printer
Server
1 Internal and
an Up To 3 External Sensors
Part Number
Feature
Package
SX8733EWLTRT
2 Programmable ports
MLPD-6
SX8743EMSTRT
4 Programmable ports
MSOP-8
SX8744EMSTRT
3 Programmable ports
MSOP-8
Projector
Batteries charger monitoring
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 1
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SX8733
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Table of contents
Section
2.
3.
4.
Electrical Characteristics ......................................................................................................................................... 3
Sensor Temperature Definition ........................................................................................................................ 3
Absolute Maximum Ratings .............................................................................................................................
3
.........
...
1.3.
Electrical Specification .....................................................................................................................................
4
...................
......
1.4.
SMBus Timing Characteristics.........................................................................................................................
5
......................
.....................
1.5.
SMBus Timing Waveforms ..............................................................................................................................
5
.................
...............
Pin Configuration .....................................................................................................................................................
6
............
....... ......
2.1.
Pinout...............................................................................................................................................................
6
....................
...........
2.2.
Pin Description.................................................................................................................................................
6
......................
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
.....................
................
.........................
....................
3.5.1.
Algorithmic Track Resistance Cancellation
10
ncellation
lation ............................................................................................
.......
......
..........................
......................
3.5.2.
3-Point Track Resistance Cancellation
...................................................................................................
10
cellation
ation ........
..........................
..............
3.5.3.
The Kelvin (4-wire) Track Resistance
Cancellation.................................................................................
11
stance Ca
ation...........
ation...................
3.6.
Temperature Acquisition Sequence...............................................................................................................
11
quence..........
ence........
....................
.........................
3.7.
Alarm..............................................................................................................................................................
12
.....................
..........
.... ................
...........
3.8.
Temperature Data Format
12
ormat .............................................................................................................................
.............
................
.........
.....
3.9.
Continuous Time Vs. Single Sh
Shot ..................................................................................................................
13
......................
...............
Application Note.....................................................................................................................................................
13
... ..............
.....................
4.1.
5.
6.
7.
8.
r
1.1.
1.2.
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
1.
Page
Typical Temperature
System With A SX8743.................................................................................. 13
mperatur
eratu Sensing
Se
Sen
Power-Up Sequence
.............................................................................................................. 14
equence
ence and Standby Mode .....
Serial Interface.......................................................................................................................................................
15
erface............
face..........
6.1.
Register
gister Write
Writ - Combined Format ................................................................................................................ 15
6.2.
Register
- Direct Format ....................................................................................................................... 15
er Write
W
6.3.
Register Read - Combined Format ................................................................................................................ 15
6.4.
Register Read - Direct Format ....................................................................................................................... 16
6.5.
Soft Reset ...................................................................................................................................................... 16
Register / Memory Map ......................................................................................................................................... 17
7.1.
Memory Map .................................................................................................................................................. 17
7.2.
Registers Description..................................................................................................................................... 17
Packaging Information ........................................................................................................................................... 21
8.1.
MLPD-W6-EP2 Package Outline Drawing..................................................................................................... 21
8.2.
MLPD-W6-EP2 Land Pattern Drawing........................................................................................................... 22
8.3.
Package Outline Drawing: MSOP-8............................................................................................................... 23
8.4.
Land Pattern Drawing: MSOP-8 .................................................................................................................... 24
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
1. Electrical Characteristics
1.1. Sensor Temperature Definition
Parameter
Symbol
TJ
External diode temperature (remote diode junction temperature)
TD
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
Local sensor diode temperature (chip junction temperature)
1.2. Absolute Maximum Ratings
Stresses above the values listed below may cause permanent device failure. Exposure
Exposu
xpos e to absolute
a
ab
maximum ratings for
extended periods may affect device reliability. Operation outside the parameters
ters specified
specifi
specifie in the Electrical Characteristics
section is not implied.
Parameter
Symbol
Conditions
s
Min
in
Max
Unit
Power supply to VSS
VDD,ABSMAX
-0.5
5.75
V
Storage temperature
TJ,STORE
-5
-50
150
°C
Ambient operating temperature
TJ,ABSMAX
--40
-4
140
°C
Input voltage on programmable
pin
VPIN,ABSMAX
AX
P1, P2, P
P3, P4
-0.5
VDD + 0.25
V
Input voltage on SMBUS pin
VPIN,SMBUS
N,SMBUS
MBUS
SMBCLK, SMBDAT
S
-0.5
5.75
V
Input current on any pin
IPIN,ABSMAX
PIN,ABSM
-10
10
mA
Peak reflow temperature
TP
PKG
260
°C
Latchup
ILUP
P
100
mA
2
kV
ESD
Revision V3.0/May 2011
©2011 Semtech Corp.
-100
HBM
Human Body Model
MM
Machine Model
200
V
CDM
Charged Device Model
500
V
Page 3
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SX8733
Precision Digital Temperature Sensor
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
1
ms
Operating Conditions
Power supply
VDD
trise25
TJ = 25°C
Power supply rise time1
trise125
TJ = 125°C
Operating temperature
TJ
Operating temperature =
Junction temperature
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
Power supply rise time1
0.5
0
0.
-40
-4
ms
125
°C
250
400
uA
40
uA
Current Consumption
10 Hz sampling
ing rate
ellation
on mode
No track cancellation
Active current
IVDD,ACTIV
Current in standby mode
IVDD,STDBY
10
TRESOL
0.125
E
Temperature to Digital Converter
Temperature resolution
°C
TD,ERR1
RR1
TJ = 25°C to 85°C
TD = 25°
5°C to 100°C
-1.5
±0.5
1.5
°C
TD,ERR2
TJ = 25°C to 85
85°C
TD = - 40°C to 125°
125 C
-3
±1.5
3
°C
TJ,E
J,ERR1
TJ = 25
25°C to
t 85°C
-2
±0.75
2
°C
TJ,ERR2
RR2
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
ow voltag
VOL,AL
IOL< 4mA
Leakage current
ID,LEAK
Standby mode
Remote temperature error2
Local temperature error2
Conversion time
Remote-diode source
ource current
curren
-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. See Figure 10
2. Specification with VDD=3.0V to 3.6V and track resistance cancellation disabled.
Revision V3.0/May 2011
©2011 Semtech Corp.
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SX8733
Precision Digital Temperature Sensor
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
SMBus fall time
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
SMBus clock frequency
SMBDAT and SMBCLK time low
for reset of serial interface
tR,SMB
300
ns
tF,SMB
300
ns
35
ms
tTIMEOUT
25
tSU,DAT
100
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
0
us
Repeated start-condition setup
time
(SMBCLK high to SMBDAT low)
tSU,STA
A
0.6
us
tBUF
1.3
us
Data setup time
Data hold time1
SMBus free time between stop
and start conditions
1. The device provides a hold time
me of at least 300ns
3
for
or the
he SMBDAT ssignal to bridge the undefined region of the falling edge of SMBCLK.
N
ot
1.5. SMBus Timing
Waveforms
ing
g Wav
f
fo
SMBDAT
SMBCLK
tSU,STA
tHD,STA
tLOW
tHIGH
tHD,DAT
Start
tSU,DAT
tSU,STO
tBUF
Stop
Figure 1. SMBUS Timing
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
2. Pin Configuration
2.1. Pinout
SX8743
SX87331
P1
VSS
SMBDAT
SMBCLK
VDD
P2
-
Pin #
SX8744
VDD
P1
P2
NC
C
VSS
P4
SMBDAT
S
SM
DAT
AT
SMBCLK
SMB
SMBC
VDD
P3
P2
P1
VSS
P4
SMBDAT
SMBCLK
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
1
2
3
4
5
6
7
8
1. MLPD exposed pad is not connected internally. It is connected
ected to ground plane for
thermal dissipation
Table 1 Pinout
out
2.2. Pin Description
Pin
Type
SMBCLK
SMBDAT
VDD
VSS
DIGITAL
TAL
L
IGITAL
TAL
DIGITAL
POWER
OWER
POWER
Description
SM
SMB
SMBus serial
erial clock input, open
op drain
S
s serial
erial data input/
in
SMBus
input/output, open drain
sitive power ssupply
Positive
supply
Negative powe
power su
Table 2 Power
P
r and
nd SMBus
MBus P
Pin Description
Pin
P1
P2
P3
P4
VSS
Type
Descrip
Description
ANALOG
DIGITAL
AL
ANALOG
ALOG
diode current
Ext. di
nt source
output, pseudo-open
drain
Alarm ou
open d
Ext. diode current source
E
ANALOG
LOG
Ext. diode return current sink
DIGITAL
L
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-
D1-
AL2
D1-
D1-
AL1
D2+ D2+
D3+ D3+ D1+
D1D2-
AL1 AL1
D2-
Alarm output, pseudo-open drain
Ext. diode return current sink
D1-
D2+ D2+ D2+
AL2 AL2
D1-
D1D2-
D1-
D1-
D1D1AL1 AL1 D2D3D1- D1D1- D1D2- D2D2- D2D3- D3-
Table 3 Programmable Pin Description
Revision V3.0/May 2011
©2011 Semtech Corp.
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SX8733
Precision Digital Temperature Sensor
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
3
6
P1
P2
P3
2
6
P4
D1+
D1-
D2+
+
-
D2-
+
-
D3+
D3-
+
-
+
ADC
-
SMBUS
SX8733
SX8744
SX8743
The device
vice has a 2-level
2
current source
and an
n ADC to measure each diode’s
forward
voltage
to
compute
the
rwa
volta
temperature.
tempera
mper re
e The input multiplexer allows 3
external
xternal and 1 internal sensors to be
connected to the ADC.
connec
connect
ALARM
MUX
6
1
DECODER
3
2
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
4
SMBCLK
4
8
SMBDAT
BDAT
3
7
VDD
VD
5
1
VSS
VS
2
5
Two alarms can provide to the system the
information
in
atio that a sensor temperature has
reached
ched
d the programmable threshold.
The
e chip is configured with a 2-wire
SMBUS se
serial line.
The functional
ffunct
2.
Figure 2
Figur
diagram
is
shown in
Figure 2. Functional Diagram
3.2. Modes
The mode set in RegConfig allows
ws numerous circuit
it configurations
configur
onfigu ons described in Figure 3 and Figure 4.
Up to 3 external sensors can
connected. Theses
configured with differential or single-ended connections.
n be connecte
connected
eses
s are con
conf
N
ot
Some modes provide a track
feature to decrease temperature inaccuracy linked to long PCB traces
a resistance
resistanc cancellation
cellation featu
connecting the external
al sensor
senso
sens to
o the
th chip.
p. This is set in
i RegControl (bits Point3 or Algo). Table 4 presents the mode for the
SX8743.
Mode
External sensor
or
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.
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
P1
P1
TD1
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
P2
TD1
P2
Mode 0, Mode 1
Mode 2
VDD
P1
P2
P1
P2
ALARM1
TD2
VSS
V
ALARM2
Mode 3
Mode 4, Mode
Mo 5
P1
P1
TDD1
VSS
TD1
P2
TD1
VDD
VDD
P2
P3
ALARM1
P4
ALARM2
ALARM1
ALA
Mode 8, Mode 9
Mode 6, Mode 7
P1
P1
TD1
P2
P2
VDD
TD1
P3
P3
ALARM1
P4
ALARM2
P4
Mode 10
TD2
Mode 11, Mode 12
Figure 3. Mode Connection Diagrams (Modes 0 to 12)
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
P1
P1
TD1
P2
VDD
TD2
TD2
P3
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
VSS
TD1
P2
VDD
P3
ALARM1
P4
P4
ALARM2
Mode 13, Mode 14
Mode
de 15
P1
P1
P
P2
P3
TD1
P2
TD2
P3
TD3
VSS
P4
ALARM1
P4
VDD
TD1
TD2
TD3
ALARM1
A
LAR
Mode 18
N
ot
1
Mode 16, Mode 17
P1
P2
TD1
P3
P4
Mode 20
Figure 4. Mode Connection Diagrams (Modes 13 to 18 and 20)
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
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
ne 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
develo
eve
anode which will be measured as temperature noise.
A filtering capacitor is recommended to decrease measurement noise especially if the
sensor is connected to the
e external sen
chip by a long trace. A capacitor with a value of 100 pF should be placed as close as possible
ossible to the chip pins.
ec
N o
ew m
m
D e
es n
ig de
ns d
3.4. Measurement Principle
The circuit uses the intrinsic thermal property of a diode to measure temperature.
erature.
ture. Temperature
Temp
is calculated by measuring
the base-emitter voltage of a transistor. Two different currents are sourced
ourced
urced to the
th 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
curately
ately calcu
base-emitter voltage at the two currents.
The excitation current I2 of 100uA is passed through the diode first.. The base-emitter
ba
bas mitter voltage of the transistor is measured
by the ADC. The measurement is then repeated using the excitation
divided
tation current
curr
cur
ded by a fixed
fix value. This current I1 has a
value of 10uA. The following equation relates the VBE difference
fference
ence volta
voltag
voltage with
th current and te
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.
s. (T
Tabs=273.1
=273.15 + T
where T is the temperature in Celsius).
R
n is the pn junction ideality factor (1.00
.00
0 for an ideal
idea
ide diode)
de)
For a current ratio I2/I1=10 and an ideality
deality
ty factor
facto n=1.010,
010 this
his gives
give a
and
nd
temper
temperature
e
of
f
200
200uV
200uV/ºC.
C. The
C
T
fixed relationship between ΔVBE
E
voltage is then converted to digital with an ADC.
kT abs I 2
ΔVBE = V BE2 – V BE1 = n ⋅ ------------- ln § ----·
Δ
© I 1¹
q
3.5. Parasitic Track
k Resistance
R sistanc
sista
Cancellation
ancellati
N
ot
The temperature measurement
easurement
urement method described previously
p
pr
assumes
a very low seriess impedance in
a typical ΔVBE
i the sensor
sor
or path.With
path
around 200uV/ºC
ºC
C and the ΔI=I
ΔI 2-I1=90uA, 1 ohm
hm of parasitic resistance
give approximately 0.45ºC of temperature error.
in the sensorr path gives
This may result in a ssignificant 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
ΔT 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.
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 10
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SX8733
Precision Digital Temperature Sensor
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:
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
V1
V2
I
P2
Assume sensor Q1 is being measured
sured
ed in mode 2 with 3-point
track resistance cancellation enabled.
PCB trace linking the
abled. The P
device to the external sensor must be matc
matched which means the
PCB track resistance are the
The same current is forced
e same. Th
out of P1 and P2.
r
I
P1
V1
2I
VSS
The voltages developed
P2 traces are the same
ped
d on P1
P and
a
therefore the differential
on P1-P2 is not impacted by
ential
al voltage seen
s
the track resistance.
nc
nce.
Figure 5. 3-Point Track Resistance Cancellation
3.5.3. The Kelvin (4-wire) Track Resistance Cancellation
llation
on
P1
P2
P3
The
e sensor is
i connected
nnected
cted to the chip
ch via 4 wires. Two comes from
P3, P4) and two are used for the
the current
curre
curren source
urce (force : P3
voltage measurement
surement
ement (sense
(sens : P1, P2).
Sense (+)
Sense (-)
Force (+)
avoids the measurement error caused by
The Kelvin
vin connection
onnection av
the voltage
th
ltage
e drop in the
t force path.
I
I
P4
Sense
directly accross the external sensor.
nse leads are
ar attached
a
The
he P1 an
and P2 connections must be as close as possible to
ssensor
sor anode
ano and cathode respectively.
Force (-)
Figure 6. Kelvin (4-wire)
wire)
ire) Track
ack Re
Resistance
tance
nce Canc
Cancel
Cancellation
N
ot
3.6. Temperature
ure
e Acquisition
Acquis
Sequence
equenc
equence
The SX8743 monitors
onitors up to 4 sensors (3 re
remote and 1 internal). Theses can be scanned in sequence to make an
automatic reading
one after the other. The result of each conversion is stored in the temperature registers
ading of the sensors
s
(see Table 6). The register
RegSensor defines which sensors are scanned in the sequence. When all the sensors are
reg
selected, the sequence
en is the following: Int→ Ext1→ Ext2→ Ext3→Int→etc.
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
3.7. Alarm
VDD
VSS
R
ec
N o
ew m
m
D e
es n
ig de
ns d
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
ture sensing cycle.
Therefore, if TempOffsetMode bit or alarm values are changed,
sensor
nged,
d, a temperature
te
measurement must be run to update the alarm outputs.
ave
ve two alar
ala
Depending on the selected mode, the chip can have
alarm outputs: Alarm1 and
Alarm2. If the external or internal temperature exceeds
under a programmed
e eeds
ex
eds or goes
g
temperature threshold, the alarm is activated.
or local sensor may be
ed. Any
An remote
emo
m
selected to trigger Alarm1 and Alarm2.
Figure 7. Alarm Output Internal Simplified Schematics
The pseudo-open drain output shown in Figure 7 requires a pull-up
p resistor
sistor connected
conn
d to VDD. It allows connection to a
GPIO, a system shutdown or other thermal management circuitry.
Temperature
Alarm threshold
The
Th alarm
rm polarity can
ca be set active low or high
and,
the over or under
a
u
unde temperature can also be
set with
register.
h RegAlarmSet
RegAlar
RegAlarmS
Hysteresis
ysteresis
Remote or local
temperature
Alarm(1 or 2)
To prevent alarm
outputs to trig constantly when
a
the
temperature
is
reached,
the
he
limit
RegAlarmHyst
register holds a hysteresis value.
RegAlarmH
The alarm
alar remains active while the temperature is
superior
to the alarm threshold minus the value
supe
programmed
in the RegAlarmHyst register (for a
pro
trig on over-temperature) as described on
Figure 8.
Over-temperature
Over-tem
Time
N
ot
Figure 8. Alarm Output
tput
ut
3.8. Temperature
ture Data F
Format
Temperature output code from
f
the internal and external sensors are made of 2 bytes. The temperature high byte has an
ng 1ºC and
a contains the integer part of the temperature while the low byte contains the fractional value with
LSB representing
25
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.
Revision V3.0/May 2011
©2011 Semtech Corp.
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
Temperature High Byte
Temperature (ºC)
Offset Binary
0001 1000
1
Binary or
Offset Binary
Temperature (ºC)
0
0000 00002
0000 0000
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
100
0110 0100
1010 0100
0111 1111
1011 1111
0111 11113
1100 1100
Diode fault
1111 11114
1111 11114
x.500
0
0000 0100
x.625
625
25
0000 0101
x 0
x.750
0000 0110
x.87
x.875
0000 0111
R
ec
N o
ew m
m
D e
es n
ig de
ns d
127
140 or more
0000 0011
fo
r
-40 or less
1.
2.
3.
4.
Temperature Low Byte
Binary
Offset binary scale temperature values are offset by 64ºC
Binary scale returns 0ºC for all temperatures 127ºC
A diode fault is detected when the temperature ADC hard limits at 0% or 100% pulse
ulse density
3.9. Continuous Time Vs. Single Shot
The chip can be operated in 2 distinct modes: continuous time
me or one-shot.
one-sh
The one-shot mode performs one temperature measurement
After completion, it
rement
ent of all sensors
orss selected in RegSensor.
R
returns to standby.
In continuous temperature sampling, temperature
are
intervals and the result held in
re measurements
measurem
e taken at regular
reg
re
internal registers accessible by SMBUS. The RegADCRate
sampling time period.
ADCRate rregister
ter controls
ontrols th
the sa
4. Application Note
4.1. Typical Temperature Sensing
ensing
sing Sys
Sy
System
mW
With
h A SX
SX87
SX8743
VBUS
10k
0k
3.3V
1
10k
7
N
ot
SMBus
SMBu
Interface
Interfac
8
SMBDAT
SMBCLK
P1
4
SX8743
HOST
HO
GPIO
100nF
VDD
10k
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.
Revision V3.0/May 2011
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Page 13
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
A different ideality factor causes a change in the slope of the linear
equation ΔVBE=f(T).
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.
n nom
ΔT nfact = § --------------- – 1· ⋅ ( T D + 273.15 )
© n actual ¹
Manufacturer
Package
MMBT3906
Fairchild
SOT23-3
Table 5 Recommended device
ec
N o
ew m
m
D e
es n
ig de
ns d
5. Power-Up Sequence and Standby Mode
fo
r
Part Number
A fast rise of the power supply at power-up is required to
ensure a safe start. The rise time must meet the timing
described in Figure 10
At power-up, the device is in one-shot mode waiting for an
SMBUS command to start conversion.
VDD
2.7V
2
V
2V
The measurement interval and the alarm thresholds will default
fault
to a set value at power-up but may be reconfigured to different
rent
values with SMBUS command.
Between temperature measurements, to decrease
rease
se power
consumption, the chip will shut down into its low-power
w-power
ower standby
stand
state with most functions disabled.
0
t rise
t
Valid rise time
N
ot
R
Figure 10. Power supply rise time
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
6. Serial Interface
6.1. Register Write - Combined Format
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
Write to single register (combined format)
SA SA SA
2
1
0
WD WD WD WD WD WD WD WD
7
6
5
4
3
2
1
0
R/
W
Slave address 0x4C
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
Slav ACK driven
Slave
riven
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
SA0
RA7
R/W
Slave address 0x4C
RA6
RA5
RA4
A4
RA3
RA2
RA1
RA0
RA
WD7
W
D7 WD6 WD5 WD4 WD3 WD2 WD1 WD0
Register Address
Re
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
6.3. Register Read - Combined Format
mat
at
Read from single register
egister (combined
(com
format)
mat)
Revision V3.0/May 2011
©2011 Semtech Corp.
Register Address
Page 15
SA
4
SA
3
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
R/
W
SA SA
6
5
NACK driven by
master
RA RA RA RA RA RA RA RA
7
6
5
4
3
2
1
0
Slave ACK driven
by SX8733
Slave address 0x4C
SA
0
Restart by Master
SA S
SA
2
1
Slave ACK driven
by SX8733
SA SA
3
4
Slave ACK driven
by SX8733
Start by Master
SA SA
6
5
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
6.4. Register Read - Direct Format
Read from single register (short format)
RD RD RD RD RD RD RD RD
7
6
5
4
3
2
1
0
Read data driven by SX8733
Stop by Master
Slave address 0x4C
NACK
K driven by
master
er
Start by Master
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
R/
W
Slave ACK driven
by SX8733
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
a slave
ve address
addres 0x00 followed by the reset
command 0x06. In other words, as illustrated in the figure below,
ow,, a soft reset
res can
n be generated
generat by sending a command at
slave address 0x00 (rather than the regular 0x4C slave address)
dress)
s) to IC register
re
er address
ddress 0x06
0x with
w any data (0xXX).
The soft reset command sets the circuit and registers in
state ass after
n the
e same sta
fter a power-up.
power-u
pow
Reset
Slave address
0x00
Revision V3.0/May 2011
©2011 Semtech Corp.
SA2
SA1
SA0
RA7
R/W
RA6
RA
RA5
RA4
A4
RA3
R
RA2
Register Address
Regis
0x06
0
Page 16
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
e ACK driven
733
by SX8733
Start by Master
SA6
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SX8733
Precision Digital Temperature Sensor
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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
0x22
0x23
0x24
0x25
0x26
0x27
0x28
0x29
0x2A
0x2B
0x2C
0x2D
0x2E
0x2F
0x30
0x31
RegIntTempMSB
RegIntTempLSB
TJ temperature reading
ding for inte
internal sensor,
ensor,
r, fractional
fractiona part,
pa LSB = 0.125ºC
RegConfig
RegExtGain
RegExtOffset
RegDeviceID
RegDeviceVersion
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
0x00
0x06
0x07
0x20
0x21
Identification Registers
Determines the chip variant and the communication interface (I2C
C or SMBus)
SMBu
SM
nt
Sets the calibration gain for remote temperature measurement
Sets the calibration offset for remote temperature measurement
ment
Read-only ID = 0x33
Read-only circuit revision
Configuration Registers
Defines which sensors are scanned in sequence
nce
Alarm1 threshold
Alarm2 threshold
ms 1 and 2, and whether
therr over-/underoverDefines which sensors control alarms
temperature triggers for
each alarm
Alarm hysteresis
ate
Temperature conversion rate
Temperature
mperature
erature Registers
Re
Reg
s
TJ temperature reading
ding
g for internal
interna sensor,
or, integer
nteger part, LSB
LS = 1ºC
RegSensor
RegAlarm1
RegAlarm2
RegAlarmSet
RegAlarmHyst
RegADCRate
RegExtTemp1MSB
TD1 temperature
ature
e reading for
fo external
rnal sensor 1, integer
iinte
part, LSB = 1ºC
RegExtTemp1LSB
TD1 temperature
perature
ure reading
readin for external sensor
senso 1, fractional part, LSB = 0.125ºC
RegExtTemp2MSB
TD2 temperature
emperature
perature rea
reading for external ssensor 2, integer part, LSB = 1ºC
RegExtTemp2LSB
TD2 temperature reading
ing for external
e rna
rnal sensor
se
2, fractional part, LSB = 0.125ºC
RegExtTemp3MSB
TD3 tempera
temperature reading
temper
eading
ding for external
exte
ex
sensor 3, integer part, LSB = 1ºC
B
RegExtTemp3LSB
temperature
tem
re reading for e
external sensor 3, fractional part, LSB = 0.125ºC
TD3 temp
RegControl
Control
rol
RegStatus
General Registers
G
Ge
General Control regist
register
tatus register
reg
General Status
Table 6 Memory map
7.2. Registers
sD
Description
De
Addr: 0x00 RegConfig
Bits
Name
Mode
Reset
7:6
Reserved
rw
00
5
SetInterface
rw
1
4:0
Mode
rw
00000
Revision V3.0/May 2011
©2011 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 17
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SX8733
Precision Digital Temperature Sensor
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
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
Description
Write to 00
Gain adjustement for external temperature measurement
Do not write to avoid production calibration altering
Addr: 0x07 RegExtOffset
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
Description
Offset adjustement for external temperature measurement.
surement.
emen
Do not write to avoid production calibration altering
ering
g
Addr: 0x22 RegSensor
Bits
7:4
3
2
1
0
Name
Mode
Reset
Reserved
rw
0000
SelExt3
rw
0
SelExt2
rw
0
SelExt1
rw
0
SelInt
rw
1
Name
Mode
Reset
Threshold1
rw
01000000
Name
Mode
Reset
eset
Threshold2
rw
01000000
Name
Mode
R
Reset
Reserved
rw
w
0
AlarmPolarity
rw
0
Direction2
2
rw
0
Direction1
ection1
rw
0
Description
Write to 0000
0: External sensor 3 not in temp.
sequence
p. scan
an seque
sequen
1: Enable external sensor 3 to be
scan sequence
e in temp. sc
0: External sensor 2 not in
sequence
n temp. scan seq
1: Enable external sensor
temp. scan sequence
sor 2 to be in tem
te
n temp. ssc
uen
0: External sensor 1 not in
scan sequence
nal sensor
ensor 1 to b
be in temp.
mp. scan sequence
1: Enable external
ensor not in temp.
temp
tem scan sequence
ence
0: Internal sensor
rnal sensor tto be in temp.
p. scan seq
sequen
1: Enable internal
sequence
Addr: 0x23
23 RegAlarm
RegAlarm1
Bits
7:0
Description
escription
cription
temperature threshold.
Alarm1
m1 tempe
temper
hreshold.
hold. The data is coherent with the binary and offset format.
1LSB=1ºC
Addr: 0x
0x24 RegAlarm2
egAlarm2
larm2
Bits
7:0
Description
Des
De
on
Alarm2 temperature thresho
threshold. The data is coherent with the binary and offset format.
A
thre
1LSB=1ºC
Addr:
ddr: 0x25
0x
0x2 RegAlarmSet
egAlarm
egA
Bits
7
6
5
4
Descriptio
escript
Description
Write to 0
0: Alarm1,
Ala
Alarm2 outputs active high
1: Alarm1,
A
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
2
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
1:0
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
Addr: 0x26 RegAlarmHyst
Revision V3.0/May 2011
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SX8733
Precision Digital Temperature Sensor
ADVANCED COMMUNICATIONS & SENSING
DATASHEET
Addr: 0x27 RegADCRate
Bits
Name
Mode
Reset
7:5
Reserved
rw
000
OneShot
rw
0
3
Regular
rw
0
2:0
Write to 000
0: Standby
1: Perform one temperature measurement
0: Disable continuous temperature sampling
1: Enable continuous temperature sampling
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
N
ot
R
ec
N o
ew m
m
D e
es n
i g de
ns d
fo
r
4
Description
Rate
rw
000
Addr: 0x28 RegIntTempMSB
pMSB
B
Bits
7:0
Name
Mode
Reset
IntTempMSB
r
00000000
Name
Mode
Reset
Reserved
r
00000
IntTempLSB
r
000
Name
Mode
Reset
et
ExtTemp1MSB
r
00000000
00000
Name
Mode
e
Reset
Res
Rese
Reserved
r
0
00000
ExtTemp1LSB
r
000
Name
Mode
M
Reset
ExtTemp2MSB
2MSB
B
r
00000000
Description
al Temperature
emperatur TJ. LSB=1ºC
B=1ºC
C
MSB of Internal
Addr: 0x29 RegIntTempLSB
RegIntTempLS
ntTempLS
Bits
7:3
2:0
Description
cription
ion
Internal Temperature
LSB
SB of Interna
perature
re TJ. LSB=0.
LSB=0.1
LSB=0.125ºC
Addr:
ddr: 0x2A RegExtTemp1MSB
R
Temp1MSB
1MSB
Bits
7:0
Description
Desc
MSB of External Temperature
M
MS
Temper
TD1. LSB=1ºC
Addr: 0x2B RegExtTemp1LSB
A
RegExtTem
RegExtTemp1L
Bits
7:3
2:0
Description
Descrip
cri
LSB of Ex
External Temperature TD1. LSB=0.125ºC
Addr: 0x
0x2C
0
RegExtTemp2MSB
Bits
7:0
Description
D
MSB of External Temperature TD2. LSB=1ºC
Addr: 0x2D RegExtTemp2LSB
Bits
Name
Mode
Reset
Reserved
rved
r
00000
2:0
ExtTemp2LSB
r
000
Bits
Name
Mode
Reset
7:0
ExtTemp3MSB
r
00000000
Bits
Name
Mode
Reset
7:3
Reserved
r
00000
2:0
ExtTemp3LSB
r
000
7:3
Description
LSB of External Temperature TD2. LSB=0.125ºC
Addr: 0x2E RegExtTemp3MSB
Description
MSB of External Temperature TD3. LSB=1ºC
Addr: 0x2F RegExtTemp3LSB
Revision V3.0/May 2011
©2011 Semtech Corp.
Description
LSB of External Temperature TD3. LSB=0.125ºC
Page 19
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SX8733
Precision Digital Temperature Sensor
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
7:4
Reserved
3
ExtTemp3End
2
ExtTemp2End
1
ExtTemp1End
0
IntTempEnd
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
ec
N o
ew m
m
D e
es n
ig de
ns d
Addr: 0x31 RegStatus
Mode
Reset
w
0000
1
Description
Write to 0000
w
1
0
1: External temperature
ature 3 conversion
conversio
convers
complete
ple
0
1: External temperature
perature
ture 2 conversion
conve
complete
omplete
plete
1
0
1: External temperature
emperature
rature 1 co
conversion
on complete
plete
1
0
1: Internal
al temperature
mperature conversion
co
c
on complete
w
w
w
N
ot
R
1. write logic 1 to register bit to clear
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 20
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
8. Packaging Information
N
ot
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
8.1. MLPD-W6-EP2 Package Outline Drawing
A
D
DIMENSIONS
DIMENS
B
DIM
A
A
A1
A2
b
D
E
D1
E1
e
L
N
aaa
bbb
E
PIN 1
INDICATOR
(LASER MARK)
A
aaa C
A1
1
SEATING
EATING
PLANE
C
A2
D1
MIL
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.
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 21
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
8.2. MLPD-W6-EP2 Land Pattern Drawing
R
K
DIMENSIONS
DIMEN
DIM
(C)
G
H
C
G
H
K
P
R
X
Y
Z
Z
Y
X
P
NOTES:
MILLIMETERS
(
(2.95)
2.2
2.20
1.6
1.65
2.38
0.95
0.225
0.45
0.75
3.70
ARE
(ANGLES IN DEGREES).
G DIMENSIONS
DIMENSI
E IN MILLIMETERS
LI
1. CONTROLLING
R
AND PATTERN IS FOR REFERENCE
REFERE
PURPOSES ONLY.
2. THIS LAND
CONSULT
MANUFACTURING
ULT YOUR M
CTURING GROUP TO ENSURE YOUR
COMPANY'S
MANUFACTURING
GUIDELINES ARE MET.
MP Y'S M
CTURING G
N
ot
3. THERMAL
HERMAL VIAS IN THE LAND PATTERN OF THE EXPOSED PAD
SHALL B
BE CONNECTED
TO A SYSTEM GROUND PLANE.
ED T
FAILURE
TO DO SO MAY
FAILU
Y COMPROMISE THE THERMAL AND/OR
FUNCTIONAL
PERFORMANCE OF THE DEVICE.
FU
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 22
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
8.3. Package Outline Drawing: MSOP-8
DIMENSIONS
INCHES
MILLIMETERS
ILL
DIM
MIN NOM MAX MIN NOM
NO MAX
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
e/2
A
A
A1
A2
b
c
D
E1
E
e
L
1
L1
N
01
aaa
b
bbb
ccc
D
N
2X E/2
E1
E
PIN 1
INDICATOR
ccc C
2X N/2 TIPS
1 2
e
B
aaa C
D
N
ot
C
1.10
0.15
0.00
0.95
0.75
0.22
0.38
0.23
0.08
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
H
A2
SEATING
PLANE
.043
.04
.006
.000
.037
.030
37
.015
.009
.009
.003
.0
4 .118 .122
.114
.11
.122
.114 .118
.193 BSC
.026 BSC
.0
.016 .024 .032
(.037)
8
8°
0°
8
.004
.005
.010
A
G
GAGE
PLANE
A1
A
b
bxN
bbb
C A-B D
0.25
L
01
(L1)
DETAIL
SIDE VIEW
c
SEE DETAIL
A
A
NOTES:
1.
CONTROLLING DIMENSIONS ARE IN MILLIMETERS (ANGLES IN DEGREES).
2. DATUMS -A- AND -B- TO BE DETERMINED AT DATUM PLANE -H3. DIMENSIONS "E1" AND "D" DO NOT INCLUDE MOLD FLASH, PROTRUSIONS
OR GATE BURRS.
4. REFERENCE JEDEC STD MO-187, VARIATION AA.
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 23
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SX8733
Precision Digital Temperature Sensor
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
fo
r
8.4. Land Pattern Drawing: MSOP-8
ec
N o
ew m
m
D e
es n
ig de
ns d
X
DIM
(C)
G
Y
P
NOTES:
(.161)
.098
.026
.0
.016
.063
.224
4
(4.10)
2.50
0.65
0.40
1.60
5.70
THIS LAND PATTERN IS FOR REFERENCE
RE
PURPOSES
POSES ONLY.
NUFACTUR
PT
NSU
CONSULT YOUR MANUFACTURING
GROUP
TO ENSURE
YOUR
ANUFACTUR
INES ARE
A
COMPANY'S MANUFACTURING
GUIDELINES
MET.
N
ot
R
1.
Z
C
G
P
X
Y
Z
MENSIO
DIMENSIONS
INCHES
CHES
MILLIMETERS
Revision V3.0/May 2011
©2011 Semtech Corp.
Page 24
www.semtech.com
SX8733
DATASHEET
ADVANCED COMMUNICATIONS & SENSING
R
ec
N o
ew m
m
D e
es n
ig de
ns d
fo
r
© S e m te c h 2 0 1 1
A ll rig h ts re s e rv e d . R e p ro d u c tio n in w h o le o r in p a rt is p ro h ib ite d w ith o u t th e p rio r w ritte n c o n s e n t o f th e c o p y rig h t o w n e r. T h e
in fo rm a tio n p re s e n te d in th is d o c u m e n t d o e s n o t fo rm p a rt o f a n y q u o ta tio n o r c o n tra c t, is b e lie v e d to b e a c c u ra te a n d re lia b le
it u s e . P u b lic a tio n
a n d m a y b e c h a n g e d w ith o u t n o tic e . N o lia b ility w ill b e a c c e p te d b y th e p u b lis h e r fo r a n y c o n s e q u e n c e o f its
o p e rty rig h ts
t . S e m te c h a s s u m e s
th e re o f d o e s n o t c o n v e y n o r im p ly a n y lic e n s e u n d e r p a te n t o r o th e r in d u s tria l o r in te lle c tu a l p ro
n o re s p o n s ib ility o r lia b ility w h a ts o e v e r fo r a n y fa ilu re o r u n e x p e c te d o p e ra tio n re s u ltin g fro m m is u s e , n e g le c t im p ro p e r
in s ta lla tio n , re p a ir o r im p ro p e r h a n d lin g o r u n u s u a l p h y s ic a l o r e le c tric a l s tre s s in c lu d in g , b u t n o t lim ite d to , e x p o s u re to
p a ra m e te rs b e y o n d th e s p e c ifie d m a x im u m ra tin g s o r o p e ra tio n o u ts id e th e s p e c ifie d ra n g e .
S E M T E C H P R O D U C T S A R E N O T D E S IG N E D , IN T E N D E D , A U T H O R IZ E D O R W A R R A N T E D T O B E S U IT A B L E F O R U S E IN
T IC A L A P P L IC A T IO N S . IN C L U S IO N O F
L IF E -S U P P O R T A P P L IC A T IO N S , D E V IC E S O R S Y S T E M S O R O T H E R C R IT
S E M T E C H P R O D U C T S IN S U C H A P P L IC A T IO N S IS U N D E R S T O O D T O B E U N D E R T A K E N S O L E L Y A T T H E C U S T O M E R ’S
O W N R IS K . S h o u ld a c u s to m e r p u rc h a s e o r u s e S e m te c h p ro d u c ts fo r a n y s u c h u n a u th o riz e d a p p lic a tio n , th e c u s to m e r s h a ll
e s , a n d d is trib u to rs h a rm le s s a g a in s t a ll c la im s ,
in d e m n ify a n d h o ld S e m te c h a n d its o ffic e rs , e m p lo y e e s , s u b s id ia rie s , a ffilia te
c o s ts d a m a g e s a n d a tto rn e y fe e s w h ic h c o u ld a ris e .
A ll re fe re n c e d b ra n d s , p ro d u c t n a m e s , s e rv ic e n a m e s a n d tra d e m a rk s a re th e p ro p e rty o f th e ir re s p e c tiv
t e o w n e rs .
Contact information
N
ot
Semtech Corporation Advanced
Adv ced Communications
Adva
C
munications
nications & Sensing Products
E-mail: sale
sales@
sales@semtech.comacsupport@semtech.comInternet:
macs
macsup
http://www.semtech.com
USA
200 Flynn
Fly Road, Camarillo, CA 93012-8790.
+1 805 498 2111 Fax: +1 805 498 3804
Tel: +
Te
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
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