Dallas Semiconductor DS2436Z, DS2436B, DS2436 Datasheet

DS2436

Battery ID/Monitor Chip

P

RELIMINARY

www.dalsemi.com

DS2436

GNDDQVDD

TO-92 PACKAGE

BOTTOM

2

3

DD

NC

NC

NC

NC

NC

DQ

GND

1234876

5

FEATURES

§ Unique 1-Wire™ interface requires only one

port pin for communication

§ Provides unique 64-bit identification number

to battery packs

§ On-board A/D converter monitors battery

voltage for end-of-charge and end-of­discharge determination

§ Eliminates thermistors by sensing battery

temperature on-chip

§ 256-bit nonvolatile user memory available

for storage of data such as fuel gauge and
manufacturing information

§ 2-byte cycle counter

§ Operating range of -40°C to +85°C

§ Applications include portable computers,

portable/ cellular phones, consumer
electronics, and handheld instrumentation

PACKAGE OUTLINE

DALLAS

DS2436Z

DS2436B

150-mil, 8-Pin SOIC

PIN DESCRIPTION

GND - Ground
DQ - Data In/Out
V

- Supply/Battery Connection

DD

V

DESCRIPTION

The DS2436 Battery Identification/Monitor Chip provides a convenient method of tagging and
identifying battery packs, by manufacturer, chemistry, or other identifying parameters. The DS2436
allows the battery pack to be coded with a unique 64-Bit ROM ID and a 16-Bit Manufacturer ID, and also
store information regarding the battery life and charge/ discharge characteristics in its nonvolatile
memory.

The DS2436 also performs the essential function of monitoring battery temperature, without the need for
a thermistor in the battery pack.

A cycle counter assists to determine the remaining cycle life of the battery.
Finally, the DS2436 measures battery voltage and sends that measured value to a host CPU for use in

end-of-charge or end-of-discharge determination or basic fuel gauge operation.

Information is sent to/from the DS2436 over a 1-Wire interface, so that battery packs need only have
three output connectors: power, ground, and the 1-Wire interface.

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DS2436

DETAILED PIN DESCRIPTION

SYMBOL DESCRIPTION

GND

DQ Data input/output pin for 1-Wire communication port

V

DD

NC

Ground pin

Supply Pin- input power supply (battery connection)
No Connect

OVERVIEW

The block diagram of Figure 1 shows the major components of the DS2436. The DS2436 has seven
major data components: 1) 64-bit lasered ROM ID, 2) Scratchpad Memory, 3) Nonvolatile Memory, 4)
On-board SRAM, 5) Temperature sensor, 6) Battery voltage A/D converter, and 7)16-bit Manufacturer
ID Register.

Communication to the DS2436 is via a 1-Wire port. With the 1-Wire port, the memory and control
functions will not be available until the ROM function protocol has been established. The master must
first provide one of four ROM function commands: 1) Read ROM, 2) Match ROM, 3) Search ROM, or 4)
Skip ROM. These commands operate on the 64-bit ROM ID portion of each device and can identify a
specific device if many are present on the 1-Wire line as well as indicate to the bus master how many and
what types of devices are present. After a ROM function sequence has been successfully executed, the
memory and control functions are accessible. The master may then provide any one of the fifteen memory
and control function commands.

Access to the DS2436 memory is through the 1-Wire interface and scratchpad memory. Charging
parameters and other data such as battery chemistry, fuel gauge information, and other user data may be
stored in the DS2436, allowing this information to be permanently stored in the battery pack.

PARASITE POWER

The ID ROM registers and memory of the DS2436 can be read even when the battery is completely
discharged by using parasite-powered operation. When parasite powered, the DS2436 “steals” power
from the DQ line whenever it is high. DQ will provide sufficient power for read operations as long as
specified timing and voltage requirements are met (see the section titled “1-Wire Bus System”).

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DS2436 BLOCK DIAGRAM Figure 1

64-BIT ROM ID AND

CONTROL LOGIC AND

256-BIT

64

-BIT

TEMPERA

TU

RE

DS2436

V

DQ

DD

GDD

MEASURING

CIRCUITRY

A/D CONVERTER

1-WIRE PORT

MEMORY FUNCTION

CONTROL

256-BIT SCRATCHPAD

TEMPERATURE REGISTER

STATUS REGISTER

VOLTAGE REGISTER

CYCLE COUNTER

MANUFACTURER ID

NONVOLATILE RAM

64-BIT SCRATCHPAD

RAM

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DS2436 MEMORY PARTITIONING Figure 2

LSB

LSB

LSB

LSB

MSB

MSB

MSB

MSB

LSB

MSB

DS2436

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DS2436 MEMORY MAP Figure 3

BYTE ADDRESS

PAGE 1 USER BYTE 0 00h

USER BYTE 1 01h
USER BYTE 2 02h
USER BYTE 3 03h

SP1 USER BYTE 4 04h

OR USER BYTE 5 05h

NV1 USER BYTE 6 06h

USER BYTE 7 07h
USER BYTE 8 08h
USER BYTE 9 09h
USER BYTE 10 0Ah
USER BYTE 11 0Bh
USER BYTE 12 0Ch
USER BYTE 13 0Dh
USER BYTE 14 0Eh
USER BYTE 15 0Fh
USER BYTE 16 10h
USER BYTE 17 11h
USER BYTE 18 12h
USER BYTE 19 13h
USER BYTE 20 14h
USER BYTE 21 15h
USER BYTE 22 16h
USER BYTE 23 17h

24 18h

DS2436

RESERVED

ADDRESS

SPACE

31 1Fh

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DS2436 MEMORY MAP (cont’d) Figure 3

BYTE ADDRESS

PAGE 2 USER BYTE 0 20h

USER BYTE 1 21h
USER BYTE 2 22h
USER BYTE 3 23h

SP2 USER BYTE 4 24h

OR USER BYTE 5 25h

NV2 USER BYTE 6 26h

USER BYTE 7 27h

8 28h

RESERVED

ADDRESS

SPACE

DS2436

31 3Fh

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DS2436 MEMORY MAP (cont’d) Figure 3

BYTE ADDRESS

PAGE 3 USER BYTE 0 40h

USER BYTE 1 41h
USER BYTE 2 42h
USER BYTE 3 43h

SP3 USER BYTE 4 44h

OR USER BYTE 5 45h

SRAM USER BYTE 6 46h

USER BYTE 7 47h

RESERVED

ADDRESS

SPACE

DS2436

31 5Fh

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DS2436 MEMORY MAP (cont’d) Figure 3

BYTE ADDRESS

PAGE 4 TEMPERATURE LSB 0 60h

TEMPERATURE MSB 1 61h

STATUS LSB 2 62h

REGISTERS STATUS LSB 3 63h

4 64h
5 65h
6 66h
7 67h
8 68h

9 69h
10 6Ah
11 6Bh

RESERVED

ADDRESS

SPACE

VOLTAGE LSB 23 77h

VOLTAGE MSB 24 78h

12 6Ch
13 6Dh
14 6Eh
15 6Fh
16 70h
17 71h
18 72h
19 73h
20 74h
21 75h
22 76h

DS2436

RESERVED

ADDRESS

SPACE

31 7Fh

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DS2436 MEMORY MAP (cont’d) Figure 3

BYTE ADDRESS

PAGE 5 MFG ID LSB 0 80h

MFG ID MSB 1 81h

CYCLE CTR LSB 2 82h

REGISTERS CYCLE CTR LSB 3 83h

RESERVED

ADDRESS

SPACE

DS2436

31 9Fh

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