Rev 21 Jan 2014 15:09 | Page 22

internal unmasked PWRGD signal.

With the ADP5051 only, each immediate PWRGD signal in each buck can be read back by the

PWRGDx bit in the ADP5051 GUI software. The only desirable channels from Channel 1 to Channel 4

MASK_CHx in Register 0x08 to obtain a desirable PWRGD output signal.

Changing the Interrupt Output Options

With the ADP5051 only, use the

pin for the fault condition warning. During normal operation, the

interrupt output is pulled high. When any fault occurs, the ADP5050 pulls the

pin low to raise the

Table 6.

Table 6. Interrupt Options in ADP5051

Name

Description

PWRG1_INT Power-good failure detected on Channel 1

PWRG2_INT Power-good failure detected on Channel 2

PWRG3_INT Power-good failure detected on Channel 3

PWRG4_INT Power-good failure detected on Channel 4

LVIN_INT

PVIN1 voltage drops below the specified threshold (adjustable in Register 7)

TEMP_INT

Junction temperature rises above the specified threshold (adjustable in Register 7)

MR_INT

The

button has been pressed

The interrupt (if any) that appears on the

pin is determined by the mask bits mapped in Register

INT_MASK. To clear an interrupt, write 1b to the detected bit in INT_STATUS, or reset the device using

UVLO.

Reading the interrupt or writing a 0b has no effect.

Enabling the Overheat Detection (ADP5051 Only)

In addition to the thermal shutdown protection, the ADP5051 has another overheat warning function,

which compares the junction temperature against the specified overheat threshold: 105°C, 115°C, or

125°(adjustable in Register 8, TEMP_TH).

Unlike thermal shutdown, the overheat warning function only sends out a warning signal without any

shutdown. When the junction temperature rises above the threshold, the status bit, TEMP_INT, goes

high. To clear the TEMP_INT status bit, write 1b to the status bit. The TEMP_INT bit status is latched

until the bit is cleared.

Use the ADP5051 GUI software to set the TEMP_TH register to enable the overheat feature. Configure

TEMP_INT to source this overheat fault into the

pin.