BQ2026 Datasheet, PDF (6/22 Pages) Texas Instruments – 1.5K-Bit Serial EPROM With SDQ Interface

bq2026
SLUS938 – DECEMBER 2011
www.ti.com
MEMORY/STATUS FUNCTION COMMANDS
Four memory/status function commands allow read and modification of the 1536-bit EPROM data memory or the
7-byte EPROM status memory. There is a READ MEMORY/Field CRC command, plus the WRITE MEMORY,
READ STATUS, and WRITE STATUS commands. The bq2026 responds to memory/status function commands
only after a part is selected by a ROM command.
READ MEMORY/Field CRC
To read the memory, the ROM command is followed by the READ MEMORY command, F0h, followed by the
address low byte and then the address high byte.
NOTE
As shown in Figure 6, individual bytes of address and data are transmitted LSB first.
The host then issues read time slots and receives data from the bq2026 starting at the initial address and
continuing until the end of the 1536-bit data field is reached or until a reset pulse is issued. If reading occurs
through the end of memory space, the host may issue sixteen additional read time slots and the bq2026
responds with a 16-bit CRC of all data bytes read from the initial starting byte through the last byte of memory.
After the CRC is received by the host, any subsequent read time slots appears as logical 1s until a reset pulse is
issued. Any reads ended by a reset pulse prior to reaching the end of memory does not have the 16-bit CRC
available.
Initialization and ROM
Command Sequence
READ MEMORY Command
F0h
Address Low Address High Read EPROM Memory Until
Byte
Byte
End of EPROM Memory
A0
A7 A8
A15
Read and
Verify 16-bit
CRC
Figure 6. READ MEMORY/Field CRC
6
Submit Documentation Feedback
Product Folder Link(s) :bq2026
Copyright © 2011, Texas Instruments Incorporated