EMC1428 Reference Design Schematic, PDF

5
4
3
2
1
Rev. Change Details
EMC1428 Temperature Sensor Reference Design
16 pin 4mm x 4mm QFN
Date
.1
Initial Release
08-Aug-07
1.0
Added title page for publication. Added units to
TRIP_SET table, added anti-parallel diodes 5 and
7, and made pin 13 N/C to match the data sheet.
09-Feb-09
D
D
C
C
Schematic Page Description
B
Page #
Title Page
1
EMC1428 Reference Design
2
Circuit diagrams utilizing SMSC products are included as a
means of illustrating typical semiconductor applications;
consequently, complete information sufficient for
construction purposes is not necessarily given. The
information has been carefully checked and is believed to
be entirely reliable; however, no responsibility is assumed
for inaccuracies. Furthermore, such information does not
convey to the purchaser of the semiconductor devices
described any license under the patent rights of SMSC or
others. SMSC reserves the right to make changes at any
time in order to improve design and supply the best product
possible.
B
A
A
Title
EMC1428 Reference Design
Size
B
Date:
5
4
3
2
Document Number
Rev
SCH-8001
Monday, February 09, 2009
1.0
Sheet
1
1
of
2
5
4
3
2
1
3
Anti-Parallel Diode
1
EXT Diode 7
2
C7
22pF
D
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
NOTE:
Place this capacitor
near pins of EMC1428
3
Q6
MMBT3904
40V / 0.1A
NOTE:
Place these capacitors
near pins of EMC1428
C16
2200pF
1
C6
22pF
EXT Diode 6
2
+3.3V
D
Q7
MMBT3904
40V / 0.1A
C8
0.1uF
C9
1.0uF
+3.3V
Anti-Parallel Diode
Q3
MMBT3904
40V / 0.1A
Q4
MMBT3904
40V / 0.1A
9
3
14
16
15
13
DN6/DP7
SHDN_SEL
SDA
10
C14
2200pF
C4
22pF
1
EXT Diode 4
2
EMC1428
R7
10K
2
C3
22pF
11
NOTE:
Place this capacitor
near pins of EMC1428
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
B
Anti-Parallel Diode
+3.3V
Example set points:
TTrip (°C)
RSet (ohm)
65
0
75
237
85
562
100
1.500k
121
9.090k
3
1
EXT Diode 3
R5
1.5K
1%
SCL
3
TRIP_SET Function
DN4/DP5
12
C5
22pF
R6
10K
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
ALERT#
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
1
EXT Diode 5
2
NOTE:
Place this capacitor
near pins of EMC1428
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
DP4/DN5
5
Q2
MMBT3904
40V / 0.1A
B
DP6/DN7
17
DN2/DP3
C12
2200pF
2
EXT Diode 2
C2
22pF
SMBus ADDR = 1001_100xb
SCL
SDA
DP2/DN3
R11
10K
GND
3
4
1
R12
10K
DN1
ALERT#
3
8
2
DP1
7
2
1
SYS_SHDN#
C11
2200pF
C1
22pF
6
1
VDD
3
U1
EXT Diode 1
C
NOTE:
Place this capacitor
near pins of EMC1428
GNDSLUG
Q1
MMBT3904
40V / 0.1A
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
TRIP_SET
C
NOTE:
Optional capacitor
Place this capacitor near
pins of remote diode
SYS_SHDN#
Q5
MMBT3904
40V / 0.1A
A
A
Title
EMC1428 Reference Design
Size
B
Date:
5
4
3
2
Document Number
Rev
SCH-8001
Monday, February 09, 2009
1.0
Sheet
1
2
of
2
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