DFE252012F-R47M datasheet(53/122 Pages) AD

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MFIO Functions

The user-selectable functions of the MFIOs are shown in Table 14 and the function of each MFIO is selected by the

MFIOx_FUNC[3:0] bits.

Table 14. MFIO Functions

MFIOx_FUNC[3:0]

FUNCTION

LOGIC

POLARITY

OUTPUT

DRIVER

INTERNAL

RESISTOR

DEBOUNCE TIMER

AND INTERRUPT

0x0

Output Enable

(EN)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x1

Low-Power Mode

(LPM)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x2

Forced-PWM Mode

(FPWM)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x3

External Clock Detection

(CLKDET)

Active-High

N/A

Disabled*

Enabled

0x4

Clock Output

(CLKOUT)

Active-High

Push-Pull*

N/A

Disabled

0x5

Output-Voltage Selection

(VSEL)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x6

Boot (Default) Output-

Voltage Selection (VB)

Active-Low

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x7

Power-OK Output

(POK)

Active-High

Open Drain or

Push-Pull

N/A

Disabled

0x8

FPS Input

(FPSI)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0x9

FPS Output

(FPSO)

Active-High

Open Drain or

Push-Pull

N/A

Disabled

0xA

System Reset Input

(RSTINB)

Active-Low

N/A

100kΩ Pull-Up to

VIO*

Enabled

0xB

System Reset Output

(RSTOB)

Active-Low

Open Drain*

N/A

Disabled

0xC

Thermal-Warning Output

(TWARNB)

Active-Low

Open Drain*

N/A

Disabled

0xD

General-Purpose Input

(GPI)

Active-High

N/A

Programmable Pull-

Up/Pull-Down

Enabled

0xE

General-Purpose Output

(GPO)

Active-High

Open Drain or

Push-Pull

N/A

Disabled

0xF

ADC MUX Input

(ADCMUX) for MFIO8

N/A

*Settings by RCFG1 override the MFIOx_PDPU[1:0] and the MFIOx_DRV_MODE bits.

The I/O signal of each function is selected by the MFIOx_SEL[2:0] bits as shown in Table 15.

Table 15. MFIO I/O Selection

MFIOx_SEL[2:0]*

EN, LPM, FPWM,

CLKDET, VSEL, VB

CLKOUT

POK

GPO

0x0

0 Clock Shifts

High Impedance

0x1

1 Clock Shift

High Impedance

0x2

2 Clock Shifts

High Impedance

0x3

3 Clock Shifts

High Impedance

0x4

GLB (M1, M2, M3, M4)

Low

POK_M1, POK_M2, POK_M3, and POK_M4

High Impedance

MAX77542

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

Converter

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