EMC1702 datasheet(27/60 Pages) MICROCHIP

27 / 60 page

EMC1702



2020 Microchip Technology Inc.

DS20006455A

4.4

ALERT Output

The ALERT pin is an open drain output and requires a pull-up resistor to VPULLUP 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 5.5).

The ALERT pin modes apply to the High Limit only for all channels. The Low Limits and diode faults

will always cause the ALERT pin to behave as if it were in Interrupt mode.

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 SMBus Alert outputs can be hard-wired

together.

4.4.1

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 temperature measurement and the

consecutive alert queue has been filled. The ALERT pin will also be asserted if a diode fault is

detected.

Additionally, the ALERT pin may be asserted if the measured current or the source voltage are out of

limit (> high limit or < low limit).

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 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.

When the ALERT pin is configured to operate in Interrupt mode, the Peak Detector circuitry will not

generate interrupts when a current peak is detected.

4.4.2

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 meets or exceeds the respective high limit. The ALERT pin will remain

asserted until all temperatures drop below the corresponding high limit minus the Tcrit Hysteresis

value.

Additionally, the ALERT pin may be asserted if the measured current or the source voltage meet or

exceed their respective high limit. The ALERT pin will remain asserted until the measured values drop

below the corresponding high limit minus the Vcrit Hysteresis value (see Section 5.27).

When the ALERT pin is asserted in Comparator mode, the corresponding high limit status bits will be

set. Reading these bits will not clear them until the ALERT pin is deasserted. Once the ALERT pin is

deasserted, the status bits will be automatically cleared.

The MASK_ALL (see Section 5.5) bit will not block the ALERT pin in this mode; however, individual

mask bits (see Section 5.11) will control the respective events that will assert the ALERT pin.

When the ALERT pin is configured to operate in Comparator mode and the Peak Detector circuitry is

linked to the ALERT pin, an interrupt will be generated when a current peak is detected (see

Section 5.19).

4.5

THERM Output

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

any of the measured temperatures meets or exceeds the user programmed Tcrit 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 drops below the Tcrit Limit minus the

Tcrit Hysteresis (also programmable).

Additionally, the THERM pin will be asserted if the current sense Peak Detection circuitry has detected

a current spike (see Section 4.1.4). The THERM pin will remain asserted so long as the Peak Detection

circuitry continues to detect excessive instantaneous current (greater than the programmed threshold).

EMC1702 데이터시트(PDF) 27 Page - Microchip Technology

EMC1702 데이터시트(HTML) 27 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60

데이터시트 다운로드

링크 URL