BQ2022_13 Datasheet, PDF (3/20 Pages) Texas Instruments – 1K-BIT SERIAL EPROM WITH SDQ INTERFACE

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bq2022
SLUS526F – OCTOBER 2002 – REVISED DECEMBER 2006
AC electrical characteristics (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
MIN TYP MAX UNIT
5 µs
5 µs
480
µs
TERMINAL
NAME
NO.
bq2022DBZR
SDQ
1
VSS
2, 3
bq2022LPR,
bq2022LPFR
VSS
1
SDQ
2
NC
3
Terminal Functions
I/O
DESCRIPTION
I
Data
-
Ground
-
GND
I
Data
-
No connection
FUNCTIONAL DESCRIPTION
General Operation
The block diagram on page 1 shows the relationships among the major control and memory sections of the
bq2022. The bq2022 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, 1024-bit EPROM, and EPROM STATUS bytes. Power
for read and write operations is derived from the DATA pin. An internal capacitor stores energy while the signal
line is high and releases energy during the low times of the DATA pin, until the pin returns high to replenish the
charge on the capacitor. A special manufacturer's PROGRAM PROFILE BYTE can be read to determine the
programming profile required to program the part.
1024-Bit EPROM
Table 1 is a memory map of the 1024-bit EPROM section of the bq2022, configured as four pages of 32 bytes
each. The 8-byte RAM buffers are additional registers used when programming the memory. Data are first
written to the RAM buffer and then verified by reading an 8-bit CRC from the bq2022 that confirms proper
receipt of the data. If the buffer contents are correct, a programming command is issued and an 8-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 1024-bit EPROM portion of the bq2022 are in the
Memory Function Commands section of this data sheet.
Table 1. 1024-Bit EPROM Data Memory Map
ADDRESS(HEX)
0060-007F
0040-005F
0020-003F
0000-001F
PAGE
Page 3
Page 2
Page 1
Page 0
EPROM STATUS Memory
In addition to the programmable 1024-bits of memory are 64 bits of status information contained in the EPROM
STATUS memory. The STATUS memory is accessible with separate commands. The STATUS bits are EPROM
and are read or programmed to indicate various conditions to the software interrogating the bq2022. The first
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