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PDF DS2435 Data sheet ( Hoja de datos )
| Número de pieza | DS2435 | |
| Descripción | Battery Identification Chip with Time/Temperature Histogram | |
| Fabricantes | Dallas Semiconducotr | |
| Logotipo |  |
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www.dalsemi.com
PRELIMINARY
DS2435
Battery Identification Chip
with Time/Temperature Histogram
FEATURES
Provides unique ID number to battery packs
Eliminates thermistors by sensing battery
temperature on-chip
Elapsed time counter provides indication of
battery usage/storage time
Time/temperature histogram function
provides essential information for
determining battery self-discharge
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.
PACKAGE OUTLINE
PR-35 PACKAGE
DALLAS
DS2435
1 23
BOTTOM VIEW
DQ 1
16 VDD
NC 2
15 NC
NC 3
14 NC
NC 4
13 NC
NC 5
12 NC
NC 6
11 NC
NC 7
10 NC
GND
8
9 GND
123
See Mech. Drawings Section
DS2435S 16-Pin SSOP
See Mech. Drawings Section
PIN DESCRIPTION
GND
- Ground
DQ - Data In/Out
VDD - Supply Voltage
NC - No Connect
DESCRIPTION
The DS2435 Battery Identification Chip with Time/Temperature Histogram provides a convenient
method of tagging and identifying battery packs by manufacturer, chemistry, or other identifying
parameters. The DS2435 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 DS2435 performs the essential function of monitoring battery temperature without the need for a
thermistor in the battery pack. A time/temperature histogram function stores the amount of time that the
battery has been in one of its eight user definable temperature bands, allowing more accurate self-
discharge calculations to be carried out by the user for determining remaining battery capacity. The on-
board elapsed time counter provides a method that can even determine the amount of time that a battery
pack has been in storage, allowing for a more accurate self-discharge determination.
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1 page  
DS2435
The second register, at address 61h, provides 1°C resolution over the -40°C to +85°C range, formatted as
follows in the binary two’s complement coding as shown in Table 1:
TEMPERATURE/DATA RELATIONSHIPS Table 1
TEMPERATURE DIGITAL OUTPUT (Binary)
+85°C
01010101
+25°C
00011001
1°C 00000001
0°C 00000000
-1°C 11111111
-25°C
11100111
-40°C
11011000
DIGITAL OUTPUT (Hex)
55h
19h
01h
00h
FFh
E7h
D8h
STATUS/CONTROL REGISTER (62h-63h)
The status register is a 2-byte register at addresses 62h and 63h (consisting of SRAM). Address 62h is the
least significant byte of the status register, and is currently the only address with defined status bits; the
other byte at address 63h is reserved for future use. The status register is formatted as follows:
where
X=
TB =
NVB =
LOCK =
Don’t Care
Temperature Busy flag. 1 = temperature conversion in progress; 0 = temperature
conversion complete, valid data in temperature register.
Nonvolatile memory busy flag. 1 = Copy from scratchpad to NVRAM in progress, 0 =
nonvolatile memory is not busy. A copy to NVRAM may take from 2 ms to 10 ms (taking
longer at lower supply voltages).
1 indicates that NV1 is locked; 0 indicates that NV1 is unlocked.
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5 Page 
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
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet DS2435.PDF ] | |
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