MMPF0100 datasheet(84/136 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

PF0100

Functional Block Requirements and Behaviors

Power Generation

7.4.6.2

Short-circuit Protection

All general purpose LDOs have short-circuit protection capability. The Short-circuit Protection (SCP) system includes debounced

fault condition detection, regulator shutdown, and processor interrupt generation, to contain failures and minimize the chance of

product damage. If a short-circuit condition is detected, the LDO will be disabled by resetting its VGENxEN bit, while at the same

time, an interrupt VGENxFAULTI will be generated to flag the fault to the system processor. The VGENxFAULTI interrupt is

maskable through the VGENxFAULTM mask bit.

The SCP feature is enabled by setting the REGSCPEN bit. If this bit is not set, the regulators will not automatically be disabled

upon a short-circuit detection. However, the current limiter will continue to limit the output current of the regulator. By default, the

REGSCPEN is not set; therefore, at start-up none of the regulators will be disabled if an overloaded condition occurs. A fault

interrupt, VGENxFAULTI, will be generated in an overload condition regardless of the state of the REGSCPEN bit. See Table 90

for SCP behavior configuration.

7.4.6.3

LDO Regulator Control

Each LDO is fully controlled through its respective VGENxCTL register. This register enables the user to set the LDO output

voltage according to Table 91 for VGEN1 and VGEN2; and uses the voltage set point on Table 92 for VGEN3 through VGEN6.

Table 90. Short-circuit Behavior

REGSCPEN[0]

Short-circuit Behavior

Current limit

Shutdown

Table 91. VGEN1, VGEN2 Output Voltage Configuration

Set Point

VGENx[3:0]

VGENx Output (V)

0000

0.800

0001

0.850

0010

0.900

0011

0.950

0100

1.000

0101

1.050

0110

1.100

0111

1.150

1000

1.200

1001

1.250

1010

1.300

1011

1.350

1100

1.400

1101

1.450

1110

1.500

1111

1.550

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