BMP585 datasheet(29/71 Pages) BOSCH

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Bosch Sensortec

| BST-BMP585-DS003-02

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Document number: BST-BMP585-DS003-02

as well as in the event of applications for industrial property rights

4.8 NVM Programmability

The BMP585 contains a non-volatile memory (NVM) that contains trimming and configuration parameters that are used

internally by the sensor. In addition, there is a user range.

4.8.1 NVM User Range

The host can write and read the memory of the user range. The range is located at addresses 0x20-0x22. Each address

holds 2 bytes. This memory area may be used for an end-of-line trim at OEM or ODM sites. The maximum number of

writes during the lifetime of BMP585 is specified by NNVM_WRITE. During the write procedure, the power supply to the

BMP585 must be stable, and no soft-reset must be issued. Otherwise, permanent damage to the device may occur.

4.8.1.1

NVM Read procedure



Switch to STANDBY mode by writing ODR_CONFIG.pwr_mode and ensuring that DEEP STANDBY is disabled 3



Wait until STATUS.nvm_rdy is equal to 1



Write the NVM register, with nvm_row_address containing the address to read, and nvm_prog_en set to 0



Write the USR_READ sequence (0x5D, 0xA5) into to CMD register. This must be done with a dedicated write

transaction, and not in the same burst write as the write to NVM_ADDR



Wait until STATUS.nvm_rdy is equal to 1. This takes approximately 200 μs



Read the data from the NVM_DATA_1 and NVM_DATA_0 registers



Check for errors in STATUS.nvm_err, STATUS.nvm_cmd_err. Read data will not be valid if one of the error flags is

set

4.8.1.2

NVM Write procedure



Switch to STANDBY mode by writing ODR_CONFIG.pwr_mode and ensuring that DEEP STANDBY is disabled 4



Wait until STATUS.nvm_rdy is equal to 1



Write the NVM register, with nvm_row_address containing the address to write, and nvm_prog_en set to 1



Write the data to be programmed to NVM_DATA_1 and NVM_DATA_0



Write the USR_PROG sequence (0x5D, 0xA0) into the CMD register. This must be done with a dedicated write

transaction, and not in the same burst write as the write to NVM_ADDR, NVM_DATA_1 and NVM_DATA_0



Wait untill STATUS.nvm_rdy is equal to 1.This takes approximately 10 ms



Check for errors in STATUS.nvm_err, STATUS.nvm_cmd_err. The write was not successfully performed if one of the

error flags is set



Reset NVM_ADDR.nvm_prog_en to 0

Writes to other NVM addresses than the user range will be ignored.

DEEP STANDBY is disabled when at least one of the conditions described in section 4.3.2 is not fulfilled

DEEP STANDBY is disabled when at least one of the conditions described in Chapter 4.3.2 is not fulfilled

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