900844 Datasheet, PDF (85/118 Pages) Freescale Semiconductor, Inc – Integrated Power Management IC for Ultra-mobile and Embedded Applications

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
0 VCC Regulator Fault Signal
x0 = No Fault Exists
x1 = Fault Exists
VNNFAULT
1 ^{VNN Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
VDDQFAULT
2 ^{VDDQ Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
V21FAULT
V15FAULT
RSVD
3 V21 Regulator Fault Signal
x0 = No Fault Exists
x1 = Fault Exists
4 ^{V15 Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
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
VBGFAULT
2:0 Reserved
3 ^{VBG Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
VCCAFAULT
4 ^{VCCA Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
VCC180FAULT 5 VCC180 Regulator Fault Signal
x0 = No Fault Exists
x1 = Fault Exists
VPNL18FAULT 6 ^{VPNL18 Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
VPMICFAULT 7 ^{VPMIC Regulator Fault Signal}
x0 = No Fault Exists
x1 = Fault Exists
Analog Integrated Circuit Device Data
Freescale Semiconductor
900844
85