MFS5600AMBAFES datasheet(43/118 Pages) NXP

43 / 118 page

NXP Semiconductors

FS5600

Automotive buck regulator and controller with voltage monitors and watchdog timer

OTP_GPIO3_CFG[1:0]

GPIO3 configuration

GPO (output)

FCCU2 (input)

ERRMON2 (input)

VMON4

Table 36. GPIO3 function selection

17.2 OV/UV monitors

The VMON1, VMON2, VMON3, and VMON4 pins are monitored for under and over voltage faults and can

be used to monitor critical voltages in the system. Status of the VMON1-4 monitored voltages can be routed

to PGOOD1 and/or PGOOD2 and can be polled by I2C. See Section 17.6 for details on selecting desired

PGOOD1/2 reactions.

OTP_VMONx_UVTH[3:0] bits control the under voltage threshold and OTP_VMONx_OVTH[3:0] set the over

voltage threshold for VMON1, VMON2, VMON3, and VMON4.

Debounce timing on the under and over voltage thresholds is also programmable between 5 μs and 125 µs

using the OTP_VMONx_UV_DB[1:0] and OTP_VMONx_UV_DB[1:0] bits.

An external resistor divider must be used to set the mid-point of the resistor divider to 0.6 V nominally.

The OV and UV thresholds shown below are with respect to 0.6 V.

The VMONx_OV_I and VMONx_UV_I bits are set upon detection of an over or under voltage on VMONx and

can be cleared in by writing a logic 1 to them. The VMONx_OV_RT and VMONx_UV_RT indicate real-time

status of the faults.

17.2.1 VMON1-4 electrical specifications

All parameters are specified at TA = –40 °C to 125 °C, VIN = 12 V, ENx = 12 V, VCC = 5.0 V, no load on

regulators, Fsw = 2.2 MHz, and typical external component values, unless otherwise noted. Typical values are

specified at 25 °C, unless otherwise noted.

Parameter

Symbol

Min

Typ

Max

Unit

Nominal voltage at VMON1/2/3/4 (no fault)

VMONx_NOM

0.6