Texas Instruments BQ28Z610-R2, Technical Reference Manual

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Byte0: Unseal Key LSB
Byte1: Unseal Key MSB
Byte2: Full Access Key LSB
Byte3: Full Access Key MSB
Write block: command through MACSubcmd() starting address 0x3E, data block (hex) = [35 00 23 01 67 45 AB
89 EF CD].
Starting address 0x60, data block(hex) = [0A 0C] (checksum followed by length)
Checksum = 0x0A = ~(0x35 + 0x00 + 0x23 + 0x01 + 0x67 + 0x45 + 0xAB + 0x89 + 0xEF + 0xCD). The
checksum is the 8-bit sum of the MSB and LSB of the command plus the (command length) bytes in the buffer.
The final sum is the bitwise inversion of the result.
12.2.24 MACSubcmd() 0x0037 Authentication Key
This command enters a new authentication key into the device.
Status Condition Action
Initiate
OperationStatus()[SEC1,SEC0] = 0,1 AND
0x0037 to MACSubcmd()
OperationStatus()[AUTH] = 1
160-bit random number available at MACData()
Enter Key
Correct 128-bit Key written to MACData() in the format
0xAABBCCDDEEFFGGHHIIJJKKLLMMNNOOPP,
where AA is LSB. In addition to this information, the
ch length data block is required.
Wait time 250 ms
OperationStatus()[AUTH] = 0
Device returns 160-bit HMAC digest at MACData() in the
format:
0xAABBCCDDEEFFGGHHIIJJKKLLMMNNOOPPQQRRSST
TT, where AA is LSB. The HMAC digest was calculated using
a challenge of all key.
The result can be used to verify the key without allowing a
plain text read back.
12.2.25 MACSubcmd() 0x0041 Device Reset
This command resets the device.
Status Condition Action
Enable 0x0041 to MACSubcmd() Reset the device
Note
Command 0x0012 also resets the device.
12.2.26 MACSubcmd() 0x0050 SafetyAlert
This command returns the SafetyAlert() flags on MACSubcmd() or MACData() .
Status Condition Action
Activate 0x0050 to MACSubcmd() Output SafetyAlert() flags on MACData()
31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 16
RSVD RSVD RSVD RSVD UTD UTC RSVD RSVD RSVD RSVD CTOS RSVD PTOS RSVD RSVD RSVD
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
RSVD RSVD OTD OTC RSVD ASCD RSVD ASCC RSVD AOLD RSVD OCD RSVD OCC COV CUV
UTD (Bit 27) : Undertemperature During Discharge
1 = Detected
I2C Commands www.ti.com
78 BQ28Z610-R2 SLUUCO0 – APRIL 2022
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