DS2434 Dallas Semiconducotr, DS2434 Datasheet - Page 9

• Manufacturer Part Number: DS2434
• Description: Battery Identification Chip
• Manufacturer: Dallas Semiconducotr

DS2434
Copy NV1 to SP1 [71h]
This command copies the entire contents (24 bytes) of NV1 to its corresponding scratchpad RAM (SP1).
This command does not use a start address; the entire contents of NV1 will be copied to SP1. The
nonvolatile RAM memory of the DS2434 cannot be read directly by the bus master; however, the
nonvolatile RAM may be copied to the scratchpad RAM.
Copy NV2 to SP2 [77h]
This command copies the entire contents (8 bytes) of NV2 (user bytes) to its corresponding scratchpad
RAM (SP2). This command does not use a start address; the entire contents of NV2 will be copied to
SP2. The nonvolatile RAM memory of the DS2434 cannot be read directly by the bus master; however,
the nonvolatile RAM may be copied to the scratchpad RAM.
Copy SRAM to SP3 [7Ah]
This command copies the entire contents (32 bytes) of SRAM to its corresponding scratchpad RAM
(SP3). This command does not use a start address; the entire contents of SRAM will be copied to SP3.
The SRAM memory of the DS2434 cannot be read directly by the bus master; however, the SRAM may
be copied to the scratchpad RAM.
Lock NV1 [43h]
This command prevents copying SP1 to NV1. This is done as an added measure of data security,
preventing data from being changed inadvertently. NV1 may be copied up into SP1 while the part is
locked. This allows NV1 to be read at any time. However, NV1 cannot be written to through a Copy SP1
to NV1 command without first unlocking the DS2434.
Unlock NV1 [44h]
This command unlocks NV1 to allow copying SP1 into NV1. This is done as an added measure of data
security, preventing data from being changed inadvertently.
PAGE 4 AND 5 COMMANDS
Convert T [D2h]
This command instructs the DS2434 to initiate a temperature conversion cycle. This sets the TB flag.
When the temperature conversion is done, the TB flag is reset and the current temperature value is placed
in the temperature register. While a temperature conversion is taking place, all other memory functions
are still available for use.
Read Registers [B2h]
This command reads the contents of the registers in Page 4 and 5. This command is followed by a start
byte address. After issuing this command and providing the start address, the user may begin reading the
data. The user may read data through the end of the register space (through address 63h in Page 4, address
83h in Page 5), after which the data read will be all logic 1s.
Increment Cycle [B5h]
This command increments the value in the cycle counter register. This command does not use a start
address; no further data is required.
Reset Cycle Counter [B8h]
This command is used to reset the cycle counter register to 0, if desired.
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