EMC1813 datasheet(18/102 Pages) MICROCHIP

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The ALERT/THERM2 pin is used as an interrupt signal or as an I2C Alert signal that allows an SMBus/I2C

slave to communicate an error condition to the master. One or more ALERT/THERM2 outputs can be

hard-wired together.

5.5.2

ALERT/THERM2 Pin in Therm Mode

When the ALERT/THERM2 pin is configured to operate in Therm mode, it becomes asserted if any of the

measured temperatures exceed the respective high limit. The ALERT/THERM2 pin remains asserted until

all temperatures drop below the corresponding high limit, minus the Therm Hysteresis value.

When the ALERT/THERM2 pin is asserted in Therm mode, the corresponding high limit Status bits are

set. Reading these bits do not clear them until the ALERT/THERM2 pin is deasserted. Once the ALERT/

THERM2 pin is deasserted, the Status bits are automatically cleared.

The MASK_ALL bit does not block the ALERT/THERM2 pin in this mode; however, the individual channel

masks prevent the respective channel from asserting the ALERT/THERM2 pin.

5.6

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

remains 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 are likewise set. Reading these bits does not

clear them until the THERM pin is deasserted. Once the THERM pin is deasserted, the THERM Status

bits are automatically cleared.

5.7

THERM Pin Address Decoding

The address decode is performed by pulling known currents from the VDD pin through the external

resistor, causing the pin voltage to drop based on the respective current/resistor relationship. This pin

voltage is compared against a threshold that determines the value of the pull-up resistor.

The EMC1812/13/14/15/33-A SMBus slave address is determined by the pull-up resistor on the

THERMADDR pin, as shown in the following table.

Table 5-2. I2C/SMBus Address Decode

Pull-Up Resistor on THERM pin (±5%)

SMBus Address

4.7 kΩ

1111_100 (r/w)b

6.8 kΩ

1011_100 (r/w)b

10 kΩ

1001_100 (r/w)b

15 kΩ

1101_100 (r/w)b

22 kΩ

0011_100 (r/w)b

33 kΩ

0111_100 (r/w)b

Multi-Channel Low-Voltage Remote Di...

System Block Diagram

Datasheet

DS20005751A-page 18

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