BQ26100_15 Datasheet, PDF (10/29 Pages) Texas Instruments – Based Security and Authentication IC

bq26100
SLUS696B – JUNE 2006 – REVISED AUGUST 2015
Programming (continued)
ROM
Function
Flow
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Host Transmits Reset?
YES
NO
bq26100 Transmits 1 For
Each Bit Start
bq26100 Transmits
Presence
Host Transmits
R/F
R/F = 0x55?
Match ID
NO
YES
Host Transmits ID
(LSB to MSB)
R/F = 0xCC?
Skip ID
NO
R/F = 0x33?
Read ID
NO
YES
YES
bq26100 Transmits ID
(LSB to MSB)
R/F = 0xF0?
Search ID
NO
YES
n=0
bq26100 Transmits ID
Bit n
NO
ID Match?
YES
Memory
Function
Flow
n=n+1
bq26100 Transmits ID
Bit n
Host Transmits ID
Bit n
Bit n Match?
NO
YES
NO
n = 63?
YES
Figure 8. ROM Function Flow Chart
The 64-bit device ID is made up of an 8-bit family code, 48-bit random value, and a final 8-bit CRC (see Table 1).
ID MSB
CRC (8 bits)
Table 1. Format of 64-bit Device ID
Random Data (48 bits)
ID LSB
Family Code (8 bits, defaults to 0x09)
Contact Texas Instruments if specific data should be programmed into the ID.
After the ROM function command is issued and the bq26100 device is selected, a Memory Function command
can be issued. The Memory Function commands are Read Memory, Read EEPROM, Read Status, Read Page,
Read Page 4, Read Digest, Read Control, Write Memory, Write Page 4, Write EEPROM, Write Status, Write
Message, Write Control, and Profile.
Figure 9 shows the flow for the Memory Function selection. Figure 12 through Figure 15 illustrate the flow for
each memory function.
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