BQ2023 Datasheet, PDF (17/27 Pages) Texas Instruments – SINGLE-WIRE ADVANCED BATTERY MONITOR IC FOR CELLULAR AND PDA APPLICATIONS

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State
bq2023
SINGLEĆWIRE ADVANCED BATTERY MONITOR IC
FOR CELLULAR AND PDA APPLICATIONS
SLUS480B – MAY 2001
APPLICATION INFORMATION
Write Memory
No
Command?
(0FH)
Yes
Bus Master Transmits LS Byte
AD7 – AD0 (LSB First)
Bus Master Transmits MS Byte
AD15 – AD8 (LSB First)
Selected
State
Bus Master Transmits Data Byte D7 – D0
8-Bit CRC Generated of Command,
Address and Data
No
CRC
Correct?
Yes
For Addresses Less Than E0 or
Equal to 101 Hex, the Bus Master
Issues Program Code 5A Hex
For Flash (00 – DF and 101 Hex) RAM
Buffer Is Logically ANDed With the
Contents of the FLASH Memory
Pointed to by Address Index Register
Program Data Re-transmitted
8-Bit CRC Generated by Loading
Lower Byte of Address and
Then Shifting in Data
Bus Master Transmits Data Byte D7 – D0
Address Counter Increments
Least Significant Byte of Address
Counter Is Loaded Into CRC Generator
Wait for
Reset
Pulse
No
FLASH Byte =
Data Byte?
Yes
Yes
End of
No
Memory?
Figure 11. Write Memory Command Flow
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