MPF7100BVMA2ES datasheet(25/125 Pages) NXP

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NXP Semiconductors

PF7100

7-channel power management integrated circuit for high performance applications

PF7100

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Product data sheet

Rev. 4 — 9 March 2021

25 / 125

14.5 Power up

14.5.1 Power up events

Upon a power cycle (VIN > UVDET), the LPM_OFF bit is reset to 0, therefore the device

moves to the LP_Off state by default. The actual value of the LPM_OFF bit can be

changed during the run mode and is maintained until VIN crosses the UVDET threshold.

In either one of the Off modes, the PF7100 can be enabled by the following power up

events:

1. When OTP_PWRON_MODE = 0, PWRON pin is pulled high.

2. When OTP_PWRON_MODE = 1, PWRON pin experiences a high to low transition

and remains low for as long as the PWRON_DBNC timer.

A power up event is valid only if:

• VIN > UVDET

• VIN < VIN_OVLO (unless the OVLO is disabled or OTP_VIN_OVLO_SDWN = 0)

• Tj < thermal shutdown threshold

• TRIM_NOK = 0 && OTP_NOK = 0 && STEST_NOK = 0

14.5.2 Power up sequencing

The power up sequencer controls the time and order in which the voltage regulators and

other controlling I/O are enabled when going from the OFF mode into the run state.

The OTP_SEQ_TBASE[1:0] bits set the default timebase for the power up and power

down sequencer.

The SEQ_TBASE[1:0] bits can be modified during the system-on states in order to

change the sequencer timing during run/standby transitions as well as the power down

sequence.

Table 18. Power up timebase register

OTP bits

OTP_SEQ_TBASE[1:0]

Functional bits

SEQ_TBASE[1:0]

Sequencer timebase

(µs)

120

250

500

The power up sequence may include any of the following:

• Switching regulators

• LDO regulators

• PGOOD pin if programmed as a GPO

• RESETBMCU

The default sequence slot for each one of these signals is programmed via the OTP

configuration registers. And they can be modified in the functional I2C register map to

change the order in which the sequencer behaves during the run/standby transitions as

well as the power down sequence.

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