Thread: DR1000 Batteries for DR1000
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Old 12-19-2012, 06:20 PM   #31
MrWarper
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Posts: 120
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Join Date: Oct 2011
Location: Spain
Device: I'm an iRex man: 8x DR1000S, 4x DR800SG, 4x DR800S
Quote:
Originally Posted by Mackx View Post
I googled a little bit and U59 seems to be a bq27500 from TI.
From the data sheet found at TI, their bq27500 looks a lot like U59 indeed (for the interested readers, NOT the little black square I pointed at, but the other one that is to the left and a bit below the power plug socket) with its 12 pins and all -- seems you didn't need the pictures after all, did you?

Quote:
Originally Posted by Mackx
I had a quick look at the datasheet at it seems to be a very complex device that can (must?) be tuned to a specific battery by programming a lot of registers via I2C.
From the data sheet, I'd guess factory battery information goes into Manufacturer Info Block A (assuming you're right about U59), and we also know:

Quote:
Originally Posted by Texas instruments
4.3 MANUFACTURER INFORMATION BLOCKS
The bq27500/1 contains 96 bytes of user programmable data flash storage: Manufacturer Info Block A, Manufacturer Info Block B, Manufacturer Info Block C. The method for accessing these memory locations is slightly different, depending on whether the device is in UNSEALED or SEALED modes.
[...]
Note: Manufacturer Info Block A is read-only when in SEALED mode.

4.4 ACCESS MODES
The bq27500/1 provides three security modes (FULL ACCESS, UNSEALED, and SEALED) that control data flash access permissions, according to Table 4-6.
[...]

4.5 SEALING/UNSEALING DATA FLASH
The bq27500/1 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 [...]
So, wanna try and destroy one of my spare motherboards?
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