BQ2026 Datasheet, PDF (3/22 Pages) Texas Instruments – 1.5K-Bit Serial EPROM With SDQ Interface

www.ti.com
AC SWITCHING CHARACTERISTCS (continued)
T_A = –20°C to 70°C; V_PU(min) = 2.65 V_DC to 5.5 V_DC, all voltages relative to VSS
PARAMETER
TEST CONDITION
t_PRE
t_PFE
t_RSTREC
Program rising-edge time
Program falling-edge time
PIN
NAME
NO.
bq2026DBZR
SDQ
1
VSS
2, 3
bq2026LPR
VSS
1, 3
SDQ
2
Pin Functions
I/O
DESCRIPTION
I/O
Data
-
Ground
-
Ground
I/O
Data
bq2026
SLUS938 – DECEMBER 2011
MIN TYP MAX UNIT
5 μs
5 μs
480
μs
FUNCTIONAL DESCRIPTION
GENERAL OPERATION
The block diagram shows the relationships among the major control and memory sections of the bq2026. The
bq2026 has three main data components: a 64-bit factory-programmed ROM, including 8-bit family code, 48-bit
identification number and 8-bit CRC value, 1536-bit EPROM, and EPROM STATUS bytes. Power for read and
write operations is derived from the SDQ pin. An internal capacitor stores energy while the signal line is high and
releases energy during the low times of the SDQ pin, until the pin returns high to replenish the charge on the
capacitor.
EPROM
Table 1 is a memory map of the 1536-bit EPROM section of the bq2026, configured as six pages of 32 bytes
each. The 1-byte RAM buffer is an additional register used when programming the memory. Data are first written
to the RAM buffer and then verified by reading a 16-bit CRC from the bq2026 that confirms proper receipt of the
data. If the buffer contents are correct, a programming pluse is issued and a 1-byte segment of data is written
into the selected address in memory. This process ensures data integrity when programming the memory. The
details for reading and programming the 1536-bit EPROM portion of the bq2026 are in the Memory Function
Commands section of this data sheet.
Table 1. 1536-Bit EPROM Data Memory Map
ADDRESS (HEX)
00A0-00BF
0080-009F
0060-007F
0040-005F
0020-003F
0000-001F
PAGE
Page 5
Page 4
Page 3
Page 2
Page 1
Page 0
EPROM STATUS MEMORY
In addition to the programmable 1536-bits of memory are 8 bytes of status information, the first 7 bytes are
available to the user, contained in the EPROM STATUS memory. The STATUS memory is accessible with
separate commands. The STATUS bytes are EPROM and are read or programmed to indicate various
conditions to the software interrogating the bq2026. These general purpose bytes can be used by the customer
to store various information.
Copyright © 2011, Texas Instruments Incorporated
Product Folder Link(s) :bq2026
Submit Documentation Feedback
3