DS2435 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS2435

Battery Identification Chip with Time/Temperature Histogram

Dallas Semiconductor -> Maxim Integrated 

EXAMPLE CODES FOR 771 HOURS, 22.5 MINUTES

WITH DIFFERENT SAMPLE RATES Table 2

SAMPLE RATE

1/8

tX BYTE 1

00011000

1/4

00001100

1/2

00000110

1

00000011

DS2435

tX BYTE 2

00011011

00001101

00000110

00000011

MEMORY FUNCTION COMMANDS

The protocols necessary for accessing the DS2435 are described in this section. These are summarized in

Table 3, and examples of memory functions are provided in Tables 4 and 5.

PAGE 1 THROUGH PAGE 3 COMMANDS

Read Scratchpad [11h]

This command reads the contents of the scratchpad RAM on the DS2435. 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 scratchpad space (address 5Fh), with any reserved

data bits reading all logic 1s. Once the end of the scratchpad is reached the data in address 5Fh will be

read repeatedly until termination of the read scratchpad command.

Write Scratchpad [17h]

This command writes to the scratchpad RAM on the DS2435. This command is followed by a start byte

address. After issuing this command and providing the start address, the user may begin writing data to

the DS2435 scratchpad at the starting byte address.

Copy SP1 to NV1 [22h]

This command copies the entire contents (24 bytes) of Scratchpad 1 (SP1) to its corresponding

nonvolatile memory (NV1). The nonvolatile RAM memory of the DS2435 cannot be written to directly

by the bus master; however, the scratchpad RAM may be copied to the nonvolatile RAM. This prevents

accidental overwriting of the nonvolatile RAM and allows for the data to be written first to the

scratchpad, where it can be read back and verified before copying to the nonvolatile RAM. This

command does not use a start address; the entire contents of the scratchpad will be copied to the

nonvolatile RAM. The NVB bit will be set when the copy is in progress. NV1 is made with E2 type

memory cells that will accept at least 50000 changes.

Copy SP2 to NV2 [25h]

This command copies the entire contents (8 bytes) of SP2 (user bytes) to its corresponding nonvolatile

memory (NV2). This command does not use a start address; the entire contents of SP2 will be copied to

NV2. The NVB bit will be set when the copy is in progress. NV2 is made with E2 type memory cells that

will accept at least 50000 changes.

Copy SP3 to SRAM [28h]

This command copies the entire contents (32 bytes) of SP3 to its corresponding SRAM. This command

does not use a start address; the entire contents of SP3 will be copied to the SRAM.

11 of 24

Share Link: