EMC1428-1-AP-TR SMSC, EMC1428-1-AP-TR Datasheet - Page 19

• Manufacturer Part Number: EMC1428-1-AP-TR
• Description: Board Mount Temperature Sensors Octal Temp Sensor
• Manufacturer: SMSC

Specifications of EMC1428-1-AP-TR

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

1°C Multiple Temperature Sensor with HW Thermal Shutdown & Hottest of Thermal Zones
Datasheet
APPLICATION NOTE: When measuring a 45nm CPU diode, the reported temperature has an error of approximately
SMSC EMC1428
4.4
4.5
4.5.1
TEMP (°C)
Consecutive Alerts
Temperature Monitoring
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
The EMC1428 contains multiple consecutive alert counters. One set of counters applies to the ALERT
pin and the second set of counters applies to the SYS_SHDN pin. Each temperature measurement
channel has a separate consecutive alert counter for each of the interrupt conditions (High, Low, Diode
fault). All counters are user programmable and determine the number of consecutive measurements
that a temperature channel(s) must be out-of-limit or reporting a diode fault before the corresponding
status bit is set or pin is asserted.
See
The EMC1428 can monitor the temperature of up to seven (7) externally connected diodes as well as
the internal or ambient temperature. Each channel is configured with the following features enabled or
disabled based on user settings and system requirements.
Resistance Error Correction
The EMC1428 includes active Resistance Error Correction to remove the effect of up to 100 ohms of
series resistance. Without this automatic feature, voltage developed across the parasitic resistance in
the remote diode path causes the temperature to read higher than the true temperature is. The error
induced by parasitic resistance is approximately +0.7°C per ohm. Sources of series resistance include
bulk resistance in the remote temperature transistor junctions, series resistance in the CPU, and
resistance in the printed circuit board traces and package leads. Resistance error correction in the
Section 5.14
+1.5C at 100°C. This error is related to non-perfect ideality in the CPU diode.
for more details on the consecutive alert function.
Table 4.1 V
RSET (Ω)
1020.0
1100.0
1150.0
453.0
487.0
523.0
562.0
604.0
649.0
698.0
750.0
787.0
845.0
909.0
953.0
TRIP
DATASHEET
Resistor Settings (continued)
19
TEMP (°C)
114
115
116
117
118
119
120
121
122
123
124
125
126
127
65
Revision 0.69 (06-29-09)
RSET (Ω)
10700.0
12700.0
15800.0
20500.0
29400.0
49900.0
4120.0
4530.0
4990.0
5490.0
6040.0
6810.0
7870.0
9090.0
Open