DS2438 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
DS2438 Datasheet PDF : 29 Pages
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DS2438
Page 1 (01h)
The second page, Page 1, contains the ICA, elasped time meter, and current offset data. Both the ETM
and ICA are volatile read/write locations so that they may be set, changed, or cleared by the host
software. Bytes 0-3 contain the ETM data, formatted as described in the “Operation - Elapsed Time
Meter” section. Byte 4 contains the 8-bit ICA. Bytes 5 and 6 contain the Offset Register data. Byte 7 is
reserved and will read out as all “1”s.
Page 2 (02h)
The third page of memory (Page 2) contains the Disconnect (first 4 bytes) and End of Charge (remaining
4 bytes) timestamps. This page is volatile and read/write. Refer to the “Operation – Elapsed Time Meter”
section for the formatting of these locations.
Pages 3-7 (03h - 07h)
The remainder of the memory in the DS2438 (Pages 3 through 7) is backed with EEPROM. This memory
provides 40 bytes of user memory which may be used to carry any information the user wishes to store.
Additionally, the CCA/DCA information is stored in bytes 4-7 of page 7 if the DS2438 is configured
appropriately. If the CCA/DCA is used, page 7 should not be written to or current accumulator data will
be overwritten. See “Operation-Current Accumulators” for details.
MEMORY MAP Figure 7
PAGE BYTE
CONTENTS
R/W NV
0
STATUS/
R/W YES
CONFIGURATION
1
TEMPERATURE
R
NO
LSB
2
TEMPERATURE
R
NO
MSB
0
3
VOLTAGE LSB
R
NO
4
VOLTAGE MSB
R
NO
5
CURRENT LSB
R
NO
6
CURRENT MSB
R
NO
7
THRESHOLD
R/W YES
0
ETM BYTE 0
R/W NO
1
ETM BYTE 1
R/W NO
2
ETM BYTE 2
R/W NO
1
3
ETM BYTE 3
R/W NO
4
ICA
R/W NO
5
OFFSET LSB
R/W YES
6
OFFSET MSB
R/W YES
7
RESERVED
R/W NO
0
DISCONNECT
R/W NO
BYTE 0
1
DISCONNECT
R/W NO
BYTE 1
2
DISCONNECT
R/W NO
BYTE 2
2
3
DISCONNECT
R/W NO
BYTE 3
4
END OF CHARGE R/W NO
BYTE 0
5
END OF CHARGE R/W NO
BYTE 1
6
END OF CHARGE R/W NO
BYTE 2
7
END OF CHARGE R/W NO
BYTE 3
PAGE BYTE
0
1
2
3
3
4
5
6
7
0
1
2
3
4
4
5
6
7
·
·
·
·
·
·
0
1
2
7
3
4
5
6
7
16 of 29
CONTENTS
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
·
·
·
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE/
CCA LSB
USER BYTE/
CCA MSB
USER BYTE/
DCA LSB
USER BYTE/
DCA MSB
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
·
·
·
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
NV
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
YES
·
·
·
YES
YES
YES
YES
YES
YES
YES
YES
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