DS2436
Battery ID/Monitor Chip
www.maxim-ic.com
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-of-
discharge 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
DS2436
1 2 3
BOTTOM
NC
NC
DQ
GND
GND
DQ
VDD
1
2
3
4
8
7
6
5
V
DD
NC
NC
NC
DS2436B+
TO-92 PACKAGE
DS2436Z+
150-mil, 8-Pin SOIC
PIN DESCRIPTION
GND
DQ
V
DD
- Ground
- Data In/Out
- Supply/Battery Connection
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.
1-Wire is a registered trademark of Dallas Semiconductor.
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071607
DS2436
ORDERING INFORMATION
PART
DS2436B+
DS2436B+T&R
DS2436Z+
DS2436Z+T&R
DS2436B
DS2436B/T&R
DS2436Z
DS2436Z/T&R
MARKING
DS2436
DS2436
DS2436
DS2436
DS2436
DS2436
DS2436
DS2436
PACKAGE INFORMATION
TO-92
DS2436B+ on Tape-and-Reel
SOIC
DS2436Z+ on Tape-and-Reel
TO-92
DS2436B on Tape-and-Reel
SOIC
DS2436Z on Tape-and-Reel
+ denotes lead-free package.
DETAILED PIN DESCRIPTION
SYMBOL
GND
DQ
V
DD
NC
DESCRIPTION
Ground pin
Data input/output pin
for 1-Wire communication port
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
DS2436 BLOCK DIAGRAM Figure 1
TEMPERATURE
MEASURING
CIRCUITRY
TEMPERATURE REGISTER
STATUS REGISTER
CONTROL LOGIC AND
MEMORY FUNCTION
CONTROL
VOLTAGE REGISTER
V
DD
A/D CONVERTER
CYCLE COUNTER
MANUFACTURER ID
DQ
64-BIT ROM ID AND
1-WIRE PORT
GDD
256-BIT SCRATCHPAD
256-BIT
NONVOLATILE RAM
64-BIT SCRATCHPAD
64-BIT
RAM
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DS2436
DS2436 MEMORY PARTITIONING
Figure 2
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
LSB
MSB
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DS2436
DS2436 MEMORY MAP
Figure 3
PAGE 1
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
USER BYTE
USER BYTE
USER BYTE
RESERVED
ADDRESS
SPACE
31
1Fh
BYTE
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
ADDRESS
00h
01h
02h
03h
04h
05h
06h
07h
08h
09h
0Ah
0Bh
0Ch
0Dh
0Eh
0Fh
10h
11h
12h
13h
14h
15h
16h
17h
18h
SP1
OR
NV1
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