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BQ2022DBZRG4 Datasheet(PDF) 4 Page - Texas Instruments |
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BQ2022DBZRG4 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 19 page bq2022 SLUS526B − OCTOBER 2002 − REVISED OCTOBER 2003 www.ti.com 4 complement of the page address indicated by the hex value stored in the associated page address redirection byte. A value of FDh in the redirection byte for page 1, for example, indicates that the updated data are now in page 2. The details for reading and programming the EPROM status memory portion of the bq2022 are given in the Memory Function Commands section. Table 2. EPROM Status Bytes ADDRESS (HEX) PAGE 00h Write protection bits BIT0 − write protect page 0 BIT1 − write protect page 1 BIT2 − write protect page 2 BIT3 − write protect page 3 BIT4 to 7 − bitmap of used pages 01h Redirection byte for page 0 02h Redirection byte for page 1 03h Redirection byte for page 2 04h Redirection byte for page 3 05h Reserved 06h Reserved 07h Factory programmed 00h Error Checking To validate the data transmitted from the bq2022, the host generates a CRC value from the data as they are received. This generated value is compared to the CRC value transmitted by the bq2022. If the two CRC values match, the transmission is error-free. The equivalent polynomial function of this CRC is X8 + X5 + X4 + 1. Details are found in the CRC Generation Section of this data sheet. Customizing the bq2022 The 64-bit ID identifies each bq2022. The 48-bit serial number is unique and programmed by Texas Instruments. The default 8-bit family code is 09h; however, a different value can be reserved on an individual customer basis. Contact your Texas Instruments sales representative for more information. Bus Termination Because the drive output of the bq2022 is an open-drain N-channel MOSFET, the host must provide a source current or a 5-k Ω external pullup, as shown in the typical application circuit in Figure 1. HOST bq2022 VPU CPU 1 Communications Controller 2 SDQ 3 VSS VSS UDG−02055 Figure 1. Typical Applications Circuit |
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Similar Description - BQ2022DBZRG4 |
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