EMC1413 datasheet(20/52 Pages) SMSC

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Multiple Channel 1°C Temperature Sensors with Beta Compensation

Datasheet

Revision 1.41 (02-23-12)

SMSC EMC1413 / EMC1414

DATASHEET

6.2

THERM Output

The THERM output is asserted independently of the ALERT output and cannot be masked. Whenever

any of the measured temperatures exceed the user programmed Therm Limit values for the

programmed number of consecutive measurements, the THERM output is asserted. Once it has been

asserted, it will remain asserted until all measured temperatures drop below the Therm Limit minus

the Therm Hysteresis (also programmable).

When the THERM pin is asserted, the THERM status bits will likewise be set. Reading these bits will

not clear them until the THERM pin is deasserted. Once the THERM pin is deasserted, the THERM

status bits will be automatically cleared.

6.3

ALERT Output

The ALERT pin is an open drain output and requires a pull-up resistor to VDD and has two modes of

operation: interrupt mode and comparator mode. The mode of the ALERT output is selected via the

ALERT / COMP bit in the Configuration Register (see Section 7.4).

6.3.1

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_ALL bit. Once the ALERT pin has been masked,

it will be de-asserted and remain de-asserted until the MASK_ALL bit is cleared by the user. Any

interrupt conditions that occur while the ALERT pin is masked will update the Status Register normally.

There are also individual channel masks (see Section 7.11).

Table 6.1 Supply Current vs. Conversion Rate for EMC1413 / EMC1414

CONVERSION RATE

AVERAGE SUPPLY CURRENT

AVERAGING FACTOR (BASED ON

11-BIT OPERATION)

ENABLED

(DEFAULT)

DISABLED

ENABLED

(DEFAULT)

DISABLED

1 / 16 sec

660uA

430uA

16x

1 / 8 sec

660uA

430uA

16x

1 / 4 sec

660uA

430uA

16x

1 / 2 sec

660uA

430uA

16x

1 / sec

660uA

430uA

2 / sec

930uA

475uA

4 / sec (default)

950uA

510uA

8 / sec

1010uA

630uA

16 / sec

1020uA

775uA

0.5x

32 / sec

1050uA

0.25x

64 / sec

1100uA

0.125x

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