DS2436
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ORDERING INFORMATION
PART MARKING PACKAGE INFORMATION
DS2436B+ DS2436 TO-92
DS2436B+T&R DS2436 DS2436B+ on Tape-and-Reel
DS2436Z+ DS2436 SOIC
DS2436Z+T&R DS2436 DS2436Z+ on Tape-and-Reel
DS2436B DS2436 TO-92
DS2436B/T&R DS2436 DS2436B on Tape-and-Reel
DS2436Z DS2436 SOIC
DS2436Z/T&R DS2436 DS2436Z on Tape-and-Reel
+ denotes lead-free package.
DETAILED PIN DESCRIPTION
SYMBOL DESCRIPTION
GND
Ground pin
DQ Data input/output pin for 1-Wire communication port
V
DD
Supply Pin- input power supply (battery connection)
NC
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”).
