EMC1072-1-ACZL-TR SMSC, EMC1072-1-ACZL-TR Datasheet - Page 17

• Manufacturer Part Number: EMC1072-1-ACZL-TR
• Description: Board Mount Temperature Sensors SMBus Temp Sensor Selectable Address
• Manufacturer: SMSC

Specifications of EMC1072-1-ACZL-TR

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

1°C Temperature Sensor with Selectable Address
Datasheet
SMSC EMC1072
5.2.1
5.3
5.3.1
5.3.2
Shared THERM
THERM Pin Considerations
Because of the decode method used to determine the SMBus Address it is important that the pull-up
resistance on THERM pin be within ±10% tolerance. Additionally, the pull-up resistor on the THERM
pin must be connected to the same 3.3V supply that drives the VDD pin.
For 15ms after power up, the THERM pin must not be pulled low or the SMBus Address will not be
decoded properly. If the system requirements do not permit these conditions, then the THERM pin must
be isolated from their respective busses during this time.
One method of isolating this pin is shown in
The ALERT pin is an open drain output and requires a pull-up resistor to V
operation: interrupt mode and comparator Mode. The mode of the ALERT output is selected via the
ALERT / COMP bit in the Configuration Register (see
ALERT Pin Interrupt Mode
When configured to operate in interrupt mode, the ALERT pin asserts low when an out of limit
measurement (> high limit or < low limit) is detected on any diode or when a diode fault is detected.
The ALERT pin will remain asserted as long as an out-of-limit condition remains. Once the out-of-limit
condition has been removed, the ALERT pin will remain asserted until the appropriate status bits are
cleared.
The ALERT pin can be masked by setting the MASK bit. Once the ALERT pin has been masked, it
will be de-asserted and remain de-asserted until the MASK bit is cleared by the user. Any interrupt
conditions that occur while the ALERT pin is masked will update the Status Register normally.
The ALERT pin is used as an interrupt signal or as an Smbus Alert signal that allows an SMBus slave
to communicate an error condition to the master. One or more ALERT outputs can be hard-wired
together.
ALERT Pin Comparator Mode
When the ALERT pin is configured to operate in comparator mode it will be asserted if any of the
measured temperatures exceeds the respective high limit. The ALERT pin will remain asserted until
all temperatures drop below the corresponding high limit minus the THERM Hysteresis value.
ALERT Output
22K
+2.5 - 5V
Figure 5.2 Isolating THERM Pin
4.7K -
33K
+3.3V
DATASHEET
THERM /
17
ADDR
Figure
VDD
DN1
DP1
5.2.
Section
1
2
3
4
EMC1072
6.4).
7
6
5
8
DD
SMCLK
SMDATA
and has two modes of
GND
ALERT
Revision 1.39 (10-11-10)