ASL1507SHN datasheet(33/56 Pages) NXP

33 / 56 page

NXP Semiconductors

ASL1507SHN; ASL2507SHN

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

ASL1507_ASL2507

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Product data sheet

Rev. 1 — 26 April 2018

33 / 56

8.13.2 NVM read sequence

To read an NVM register, the device must be in NVM access mode. The following

sequence should be used.

1. Check that the ASL1507SHN; ASL2507SHN is in configuration mode (register 56h

shows binary 0010 0XXXb) and limp-home mode is not active (register 54h shows

binary XXXX X0XXb).

2. Enter NVM access mode by setting register 3Ah to 04h.

3. Confirm that the ASL1507SHN; ASL2507SHN is in NVM access mode (register 56h

shows binary 1101 1XXXb).

4. Write target NVM address to NVM address register (register 36h is target register).

5. Ensure that the NVM is ready (register 55h shows binary XXXX XXX1b).

6. Initiate NVM read:

• Write register 3Ah with XXXX 0100b.

• Write register 3Ah with XXXX 0101b.

7. Wait until NVM access is completed (register 55h shows binary XXXX XXX1b).

8. Data from the NVM is now available in NVM data read register 59h for

NVM_DATA[15:8] and register 5Ah for NVM_DATA[7:0].

9. If further NVM access is required, start at step four of the read or write sequence.

10.Exit NVM access mode by setting register 3Ah to 08h.

11.NVM access complete; for reset set pin EN = LOW.

ASL1507SHN Datasheet(PDF) 33 Page - NXP Semiconductors