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