ASL1507SHN datasheet(36/56 Pages) NXP

36 / 56 page

NXP Semiconductors

ASL1507SHN; ASL2507SHN

Single-phase and two-phase boost converter with limp-home mode

ASL1507_ASL2507

All information provided in this document is subject to legal disclaimers.

Product data sheet

Rev. 1 — 26 April 2018

36 / 56

8.14 Autonomous mode

Autonomous mode enables the chip to load the configuration from NVM and start

conversion as soon as EN is HIGH without waiting for SPI configuration from MCU or

detection of SPI communication timeout.

aaa-029702

operation

reset

operation mode

enable

LOW

HIGH

VO1 and VO2

VO1 and VO2 as set in NVM

Figure 12. Autonomous mode operation

Table 49. Comparison of limp-home mode and autonomous mode

Mode

Condition

IC operation

SPI

Exit

Limp-home

the watchdog

timer detects

an SPI

communication

error

the state machine goes through

power-down sequence and then

copies the NVM configuration to

the SPI registers to resume the

operation but with the NVM setting

only access to the

limp‑home

mode control register

microcontroller

has to write the

unlock pattern to

the register

Autonomous if bit AUTO is set

to logic 1 in NVM

the state machine copies the

required settings from NVM into

the SPI registers along with the

CFG_DN bit to start the converter

microcontroller less operation,

default no SPI communication

needed, if auto and

limp‑home

are enabled at the same time,

startup in autonomous mode

power down,

reset the bit

AUTO

8.14.1 Limp-home mode/autonomous mode NVM

Table 50 summarizes the NVM programming options for both limp-home and

autonomous modes.

Table 50. NVM programming options

NVM address 00h

Feature

LIMP_DIS = 1; AUTO = 0

no limp-home and no autonomous

LIMP_DIS = 0; AUTO = 0

limp-home mode enabled (in case of

limp‑home timeout, the system applies settings

from NVM)

LIMP_DIS = 1; AUTO = 1

autonomous mode enabled

LIMP_DIS = 0; AUTO = 1

startup immediately with autonomous mode; limp-home mode enabled

ASL1507SHN Datasheet(PDF) 36 Page - NXP Semiconductors

ASL1507SHN Datasheet(HTML) 36 Page - NXP Semiconductors

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56

Datasheet Download

Link URL