900844 datasheet(85/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

POWER SUPPLIES

VRFAULT

Every supply is equipped with a fault reporting signal called xxxFAULT, where xxx is the name of the power supply. This

FAULT signal is an OR function of all of the following possible faults, or just a subset of them depending on the power supply:

• Output under-voltage

• Output over-voltage

• Over-current

• Short-circuit

Reference each power supply’s section for more information on what faults are included, and how the supply protects itself

and the load in response to the fault.

All of the xxxFAULT signals from all power supplies are ORed together into the BATOCP interrupt signal, which if unmasked,

sets the VRFAULT 1st level interrupt that causes the PMICINT pin to assert, notifying the SC of a system event. The SC can

service the VRFAULT register and access the FAULTx registers for more information on which supply caused the fault. The SC

can then take different measures, depending on the supply in question.

The xxxFAULT signals are stored in the Freescale defined registers section (Addr 0x180 - 0x1FF), which is meant for extended

functionality.

Table 50. FSLFAULT1 Fault Status Register Structure and

Bit Description

Name

Bits

Description

FSLFAULT1 (ADDR 0X1CC - R/W - DEFAULT VALUE: 0X00)

VCCFAULT

VCC Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VNNFAULT

VNN Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VDDQFAULT

VDDQ Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

V21FAULT

V21 Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

V15FAULT

V15 Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

RSVD

7:5

Reserved

Table 51. FSLFAULT2 Fault Status Register Structure and

Bit Description

Name

Bits

Description

FSLFAULT2 (ADDR 0X1CD - R/W - DEFAULT VALUE: 0X00)

RSVD

2:0

Reserved

VBGFAULT

VBG Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VCCAFAULT

VCCA Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VCC180FAULT

VCC180 Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VPNL18FAULT

VPNL18 Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

VPMICFAULT

VPMIC Regulator Fault Signal

x0 = No Fault Exists

x1 = Fault Exists

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