BQ28Z560-R1 datasheet(39/60 Pages) TI1

39 / 60 page

bq28z560-R1

www.ti.com

SLUSBD3 – APRIL 2013

As an example, the data flash location for Manufacturer Info Block B is defined as having a Subclass = 58 and

an Offset = 32 through 63 (32 byte block). The specification of Class = System Data is not needed to address

Manufacturer Info Block B, but is used instead for grouping purposes when viewing data flash info in the

bq28z560-R1 evaluation software.

When in SEALED mode or when 0x01 BlockDataControl() does not contain 0x00, data flash is no longer

available in the manner used in UNSEALED mode. Rather than issuing subclass information, a designated

Manufacturer Information Block is selected with the DataFlashBlock() command. Issuing a 0x01, 0x02, or 0x03

with this command causes the corresponding information block (A, B, or C, respectively) to be transferred to the

command space 0x40…0x5F for editing or reading by the system. Upon successful writing of checksum

information to BlockDataChecksum(), the modified block is returned to data flash.

NOTE

Manufacturer Info Block A is read-only when in SEALED mode.

ACCESS MODES

The bq28z560-R1 provides three security modes (FULL ACCESS, UNSEALED, and SEALED) that control data

flash access permissions according to Table 19. Data flash refers to those data flash locations specified in

Table 20, that are accessible to the user. Manufacturer Information refers to the three 32-byte blocks.

Table 19. Data Flash Access

SECURITY MODE

DATA FLASH

MANUFACTURER INFORMATION

FULL ACCESS

R/W

UNSEALED

R/W

SEALED

None

R (A); R/W (B,C)

Although FULL ACCESS and UNSEALED modes appear identical, only FULL ACCESS mode allows the

bq28z560-R1 to write access-mode transition keys.

SEALING/UNSEALING DATA FLASH

The bq28z560-R1 implements a key-access scheme to transition between SEALED, UNSEALED, and FULL

ACCESS modes. Each transition requires that a unique set of two keys be sent to the bq28z560-R1 via the

Control() command. The keys must be sent consecutively, with no other data being written to the Control register

in between. Note that to avoid conflict, the keys must be different from the codes presented in the CNTL DATA

column of Table 4 subcommands.

When in SEALED mode, the [SS] bit of CONTROL_STATUS is set; but when the UNSEAL keys are correctly

received by the bq28z560-R1, the [SS] bit is cleared. When the full-access keys are correctly received, the

CONTROL_STATUS [FAS] bit is cleared.

Both Unseal Key and Full-Access Key have two words and are stored in data flash. The first word is Key 0 and

the second word is Key 1. The order of the keys sent to bq28z560-R1 are Key 1 followed by Key 0. The order of

the bytes for each key entered through the Control() command is the reverse of what is read from the part. For

an example, if the Unseal Key is 0x56781234, key 1 is 0x1234 and key 0 is 0x5678. Then Control() should

supply 0x3412 and 0x7856 to unseal the part. The Unseal Key and the Full-Access Key can only be updated

when in FULL ACCESS mode.

Submit Documentation Feedback

Product Folder Links: bq28z560-R1

BQ28Z560-R1 数据表(PDF) 39 Page - Texas Instruments

BQ28Z560-R1 数据表(HTML) 39 Page - Texas Instruments

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 57 58 59 60

数据表下载