DFE252012F-R47M datasheet(38/122 Pages) AD

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(goes high) when all interrupt bits have been cleared. If an interrupt is captured during the read sequence, the IRQB

output is held low. When the IRQB output is pulled low by an unmasked interrupt event, the IRQB output stays low until

the interrupt bit is cleared by the reading operation of the host processor or the corresponding interrupt mask bit is set

to 1 (masked). All interrupts (except UVLO_I) are masked by default. Masked interrupt bits do not cause the IRQB pin to

assert.

The MAX77542 has two interrupt mask modes. With MASK_MODE = 0 (default), an interrupt bit sets for an interrupt

event regardless of the corresponding mask bit, however the interrupt event does not propagate to the interrupt source

corresponding interrupt event (gated at the interrupt bit).

In addition to interrupt bits, the MAX77542 has read-only status bits. These bits always represent the current status of

the device. It is highly recommended that the host processor read status bits whenever the MAX77542 is initialized by

the host processor. These status bits do not directly affect the state of interrupt bits.

All registers (both Type O and Type F) are reset to the POR default values specified in the Register Map section when

the CE pin is pulled low or the VSYS supply drops below its POR threshold (typ 1.7V). Whenever the CE pin is pulled

high, the MAX77542 updates the default register values based on RCFGx and RSELx detection, and the updated default

values are latched until the CE pin is pulled low or a POR event occurs. A UVLO or a TSHDN event resets all buck

output-voltage setting registers (Type F) to their default values, while a SCP event only resets buck output-voltage setting

registers (Type F) for the corresponding output.

Factory Options

The MAX77542 is factory-configurable with a variety of one-time programmable (OTP) options. See Table 4 for a selector

guide. Contact Analog Devices to request a variant of the device with specialized OTP options.

Table 4. MAX77542 Factory-Programmed Defaults (OTP Options)

MAX77542A

SELx OPTIONS

VOUT1 (V)

0.8

VOUT2 (V)

1.1

VOUT3 (V)

1.8

VOUT4 (V)

3.3

CFG1 OPTIONS

MFIO1

FPSI

MFIO2

POK_M1

MFIO3

FPWM_M1

MFIO4

CLKDET_M1

MFIO5

VB_GLB

MFIO6

RSTINB

MFIO7

TWARNB

MFIO8

RSTOB

CFG2 OPTIONS

M1_ILIM (A)

5.5

M2_ILIM (A)

5.5

M3_ILIM (A)

5.5

M4_ILIM (A)

5.5

Mx_FREQ (MHz)

1.0

MAX77542

16VIN/16A, Quad-Phase High-Efficiency Buck

Converter

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