BQ26100_15 Datasheet, PDF (17/29 Pages) Texas Instruments – Based Security and Authentication IC

www.ti.com
bq26100
SLUS696B – JUNE 2006 – REVISED AUGUST 2015
Master TX:
Reset &
Write Message Command
Master writes up to
160-bit message
Master TX:
Reset &
Write Control Command
Master sets
PROGK1/PROGK0
in CONTROL reg
Master RX:
CRC of Write Control Cmd,
Address, and Data
Master pulls SDQ line to
V_PROG for 3 ms
Master TX:
Reset &
Write Status command
Master sets
LOCKK1/LOCKK0 at Status
address 0x0000
Figure 18. Key Programming Flow
This flow is run twice, for KEY0 and KEY1. An external power source is required on the PWR pin during key
programming. Figure 20 shows a typical connection for the external power source.
Since there is no key pre-appended to the message, the key message is padded with a 1, followed by 287 0’s,
followed by the 64-bit value for 160 (00..01010000), see Figure 19.
287 bits
64 bits
1 000 . . . 000 000 . . . 0010100000
Figure 19. Key Programming Message Format Example
Communication and
Programming Pulse
Control
100 W
SDQ
PWR
VSS
0.1 mF
+
3.3V Power Supply
-
Figure 20. External Power Source Connection
Copyright © 2006–2015, Texas Instruments Incorporated
Product Folder Links: bq26100
Submit Documentation Feedback
17