DS2434
Battery Identification Chip
www.dalsemi.com
FEATURES
Provides unique ID number to battery packs
Eliminates thermistors by sensing battery
temperature on-chip
256-bit nonvolatile user memory available
for storage of user data such as gas gauge
and manufacturing information
Operating range of -40°C to +85°C
Applications include portable computers,
portable/cellular
phones,
consumer
electronics, and handheld instrumentation.
Surface-mount package (209-mil SSOP16)
available
PACKAGE OUTLINE
_
_
_
BOTTOM VIEW
DQ
NC
NC
NC
NC
NC
NC
GND
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
VDD
NC
NC
NC
NC
NC
NC
GND
PIN DESCRIPTION
GND
DQ
VDD
GND
DQ
V
DD
NC
- Ground
- Data In/Out
- Supply Voltage
- No Connect
DS2434
PR-35 PACKAGE
See Mech. Drawings
Section
DS2434 16-Pin SSOP
See Mech. Drawings
Section
DESCRIPTION
The DS2434 Battery Identification Chip provides a convenient method of tagging and identifying battery
packs by manufacturer, chemistry, or other identifying parameters. The DS2434 allows the battery pack
to be coded with a unique identification number, and also store information regarding the battery life and
charge/discharge characteristics in its nonvolatile memory.
The DS2434 also performs the essential function of monitoring battery temperature, without the need for
a thermistor in the battery pack.
Information is sent to/from the DS2434 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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110800
DS2434
DETAILED PIN DESCRIPTION
PIN
14-PIN SOIC
1
14
13
PIN
PR35
1
2
3
SYMBOL
DESCRIPTION
GND
Ground pin
DQ
Data Input/Output pin-
for 1Wire communication port
VDD
Supply pin-
input power supply
OVERVIEW
The DS2434 has five major components: 1) Scratchpad Memory, 2) Nonvolatile Memory, 3) On-board
SRAM, 4) Temperature Sensor, and 5) ID Register. All data is read and written least significant bit first.
Access to the DS2434 is over a 1-Wire interface. Charging parameters and other data such as battery
chemistry, gas gauge information, and other user data would be stored in the DS2434, allowing this
information to be permanently stored in the battery pack. Nonvolatile (E
2
) RAM holds information even
if the battery goes dead; as long as the battery remains within typical charge/discharge operating range,
the SRAM provides battery-backed storage of information.
DS2434 BLOCK DIAGRAM
Figure 1
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DS2434
DS2434 MEMORY PARTITIONING
Figure 2
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DS2434
DS2434 ADDRESSABLE RAM MEMORY MAP
Figure 3
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DS2434
DS2434 ADDRESSABLE RAM MEMORY MAP
(cont’d) Figure 3
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