BQ2023 Datasheet, PDF (18/27 Pages) Texas Instruments – SINGLE-WIRE ADVANCED BATTERY MONITOR IC FOR CELLULAR AND PDA APPLICATIONS

bq2023
SINGLEĆWIRE ADVANCED BATTERY MONITOR IC
FOR CELLULAR AND PDA APPLICATIONS
SLUS480B – MAY 2001
APPLICATION INFORMATION
program profile byte
The program profile byte provides the user a convenient method to differentiate the programming profile
required by the bq2023 from other similar products. The flowchart in Figure 12 illustrates that when the bq2023
is in the selected state, the program profile byte, 99 hex, directs the bq2023 to transmit the value 55 hex.
Selected
State
Program
No
Profile Command?
(99 Hex)
Yes
bq2023 Transmits 55 Hex
Selected
State
Wait for
Reset
Pulse
Figure 12. PROGRAM PROFILE Command Flow
flash erase command sequence
The flash erase command erases individual pages of flash. The flowchart in Figure 13 illustrates when a ROM
command has selected the bq2023, 40 hex directs the bq2023 into the erase page mode. The host then
transmits the 16-bit page erase codes found in Table 6 for the desired page to be erased.
Table 7. Page Erase Codes
FLASH PAGE
0
1
2
3
4
5
6
CODE (HEX)
0000
0020
0040
0060
0080
00A0
00C0
An 8-bit CRC of the command byte and page code is computed and transmitted by the bq2023. If the CRC is
correct, the host then transmits code 5A hex to begin the erase.
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