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DS2436 Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS2436
Beschreibung Battery ID/Monitor Chip
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 29 Seiten
DS2436 Datasheet, Funktion
www.maxim-ic.com
FEATURES
ƒ Unique 1-Wire® interface requires only one
port pin for communication
ƒ Provides unique 64-bit identification number
to battery packs
ƒ On-board A/D converter monitors battery
voltage for end-of-charge and end-of-
discharge determination
ƒ Eliminates thermistors by sensing battery
temperature on-chip
ƒ 256-bit nonvolatile user memory available
for storage of data such as fuel gauge and
manufacturing information
ƒ 2-byte cycle counter
ƒ Operating range of -40°C to +85°C
ƒ Applications include portable computers,
portable/ cellular phones, consumer
electronics, and handheld instrumentation
DS2436
Battery ID/Monitor Chip
PACKAGE OUTLINE
DALLAS
DS2436
123
BOTTOM
NC
NC
DQ
GND
1
2
3
4
8 VDD
7 NC
6 NC
5 NC
DS2436B+
TO-92 PACKAGE
DS2436Z+
150-mil, 8-Pin SOIC
PIN DESCRIPTION
GND
- Ground
DQ - Data In/Out
VDD - 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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DS2436 Datasheet, Funktion
DS2436 MEMORY MAP (cont’d) Figure 3
PAGE 2
SP2
OR
NV2
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
USER BYTE
BYTE
0
1
2
3
4
5
6
7
8
ADDRESS
20h
21h
22h
23h
24h
25h
26h
27h
28h
RESERVED
ADDRESS
SPACE
31 3Fh
DS2436
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DS2436 pdf, datenblatt
DS2436
STATUS REGISTER (62h-63h)
The Status Register is a two-byte read only register at addresses 62h and 63h. 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:
MSB
LSB
0 0 0 0 ADB LOCK NVB TB 62h
1 1 1 1 1 1 1 1 63h
where
TB =
NVB =
LOCK =
ADB =
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 EEPROM in progress, “0”
= nonvolatile memory is not busy. A copy to EEPROM 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. This status bit is
implemented in EEPROM in order to preserve its state even when the battery is
completely discharged.
A/D converter busy flag. “1” = analog-to-digital conversion in progress on battery voltage;
“0” = conversion complete, no measurement being made. An A/D conversion takes
approximately 10 ms.
VOLTAGE REGISTER (77h-78h)
The onboard analog-to-digital converter (ADC) has 10 bits of resolution and will perform a conversion
when the DS2436 receives the command protocol (Convert V) [B4h]. The result of this measurement is
placed in the 2-byte Voltage Register (see Memory Map). The range for the DS2436 ADC is 0V to 10V;
this range is suitable for NiCd or NiMH battery packs up to six cells, and for lithium ion battery packs of
two cells. The full-scale range of the ADC is scaled to 10.24V, resulting in a resolution of 10 mV.
While the ADC has a range that extends to 0V, it is important to note that the battery voltage is also the
supply voltage to the DS2436. As such, the accuracy of the ADC begins to degrade below battery
voltages of 2.4 volts, and the ability to make conversions is limited by the operating voltage range of the
DS2436.
Voltage is expressed in this register in straight binary format, as outlined in Table 2. Note that while
codes exits for values below 2.4 volts, accuracy of the ADC and the limitation on the DS2436’s supply
voltage make it unlikely that these values would be used in actual practice.
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