BQ2024 Datasheet, PDF (3/19 Pages) Texas Instruments – 1.5K-BIT SERIAL EPROM WITH SDQ INTERFACE

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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
bq2024
SLUS770 – MAY 2007
MIN TYP MAX UNIT
5 µs
5 µs
480
µs
TERMINAL
I/O
NAME
NO.
bq2024DBZR
SDQ
1
I
VSS
2, 3
-
bq2024LPR, bq2024LPFR
VSS
1
-
SDQ
2
I
NC
3
-
Terminal Functions
DESCRIPTION
Data
Ground
GND
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
bq2024. The bq2024 has three main data components: a 1536-bit factory-programmed ROM, including 8-bit
family code, 48-bit identification number and 8-bit CRC value, 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.
1536-BIT EPROM
Table 1 is a memory map of the 1536-bit EPROM section of the bq2024, configured as six 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 bq2024 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 1536-bit EPROM portion of the bq2024 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
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