Datenblatt-pdf.com


DS2760 Schematic ( PDF Datasheet ) - Dallas Semiconducotr

Teilenummer DS2760
Beschreibung High Precision Li-Ion Battery Monitor
Hersteller Dallas Semiconducotr
Logo Dallas Semiconducotr Logo 




Gesamt 25 Seiten
DS2760 Datasheet, Funktion
www.dalsemi.com
PRELIMINARY
DS2760
High Precision Li-Ion Battery Monitor
FEATURES
Li-Ion safety circuit
- Overvoltage protection
- Overcurrent/short circuit protection
- Undervoltage protection
Available in two configurations:
- Internal 25 msense resistor
- External user-selectable sense resistor
Current measurement
- 12-bit bi-directional measurement
- Internal sense resistor configuration:
0.625 mA LSB and ±1.8A dynamic range
- External sense resistor configuration:
15.625 µV LSB and ±64 mV dynamic range
Current accumulation
- Internal sense resistor: 0.25 mAhr LSB
- External sense resistor: 6.25 µVhr LSB
Voltage measurement with 4.88 mV resolution
Temperature measurement using integrated
sensor with 0.125°C resolution
System power management and control feature
support
32 bytes of lockable EEPROM
16 bytes of general purpose SRAM
Dallas 1-Wire® interface with unique 64-bit
device address
Low power consumption:
- Active current: 80 µA max
- Sleep current: 2 µA max
PIN ASSIGNMENT
CC 1
16 VIN
PLS 2
15 VDD
DC 23
14 PIO
SNS 4
13 VSS
SNS 5
12 VSS
SNS 6
11 VSS
DQ 7
10 PS
IS2 8
9 IS1
DS2760
16-Pin TSSOP Package
PLS CC VIN VDD
DC NC NC NC PIO
SNS
Probe
NC
NC
VSS
Probe
SNS
VSS
DQ IS2 IS1 PS
DS2760
Flip-Chip Packaging
PIN DESCRIPTION
CC - Charge control output
DC - Discharge control output
DQ - Data input/output
PIO - Programmable I/O pin
PLS - Battery pack positive terminal input
PS - Power switch sense input
VIN - Voltage sense input
VDD- Power supply input (2.5V-5.5V)
VSS - Device ground
SNS - Sense resistor connection
IS1 - Current sense input
IS2 - Current sense input
NC - Not connected
SNS Probe – Do not connect
VSS Probe – Do not connect
1 of 25
092000






DS2760 Datasheet, Funktion
DS2760
POWER MODES
The DS2760 has two power modes: Active and Sleep. While in Active Mode, the DS2760 continually
measures current, voltage and temperature to provide data to the host system and to support current
accumulation and Li-ion safety monitoring. In Sleep Mode, the DS2760 ceases these activities. The
DS2760 enters Sleep Mode when either of the following conditions occurs:
the PMOD bit in the Status Register has been set to 1 and the DQ line is low for
longer than 2 seconds (pack disconnection)
the voltage on VIN drops below undervoltage threshold VUV for tUVD (cell depletion)
the pack is disabled through the issuance of a SWAP command (SWEN bit =1)
The DS2760 returns to Active Mode when any of the following occurs:
the PMOD bit has been set to 1 and the SWEN bit is set to 0 and the DQ line is pulled
high (pack connection)
the PS pin is pulled low (power switch)
the voltage on PLS becomes greater than the voltage on VIN (charger connection) with the
SWEN bit set to 0
the pack is enabled through the issuance of a SWAP command (SWEN bit =1)
The DS2760 defaults to Active Mode when power is first applied.
LI-ION PROTECTION CIRCUITRY
During Active Mode, the DS2760 constantly monitors cell voltage and current to protect the battery from
overcharge (overvoltage), overdischarge (undervoltage) and excessive charge and discharge currents
(overcurrent, short circuit). Conditions and DS2760 responses are described in the sections below and
summarized in Table 2 and Figure 3.
LI-ION PROTECTION CONDITIONS AND DS2760 RESPONSES – Table 2
Condition
Activation
Release
Name
Threshold Delay
Response
Threshold
Overvoltage
VIN > VOV
tOVD
CC high
VIN < VCE
Undervoltage
Overcurrent, Charge
Overcurrent, Discharge
Short Circuit
VIN < VUV
VIS > VOC(1)
VIS < -VOC(1)
VSNS > VSC
tUVD
tOCD
tOCD
tSCD
CC , DC high,
Sleep Mode
CC , DC high
DC high
DC high
VPLS > VDD
(charger connected)
VPLS < VDD - VTP(2)
VPLS > VDD - VTP(3)
VPLS > VDD - VTP(3)
VIS = VIS1 – VIS2. Logic high = VPLS for CC and VDD for DC . All voltages are with respect to VSS. ISNS
references current delivered from pin SNS.
(1) for the internal sense resistor configuration, the overcurrent thresholds are expressed in terms of
current: ISNS > IOC for charge direction and ISNS < -IOC for discharge direction
(2) with test current ITST current flowing from PLS to VSS (pull-down on PLS)
(3) with test current ITST current flowing from VDD to PLS (pull-up on PLS)
Overvoltage. If the voltage of the cell exceeds overvoltage threshold VOV for a period longer than
overvoltage delay tOVD, the DS2760 shuts off the external charge FET and sets the OV flag in the
Protection Register. When the cell voltage falls below charge enable threshold VCE, the DS2760 turns the
charge FET back on (unless another protection condition prevents it). Discharging remains enabled
during overvoltage.
6 of 25

6 Page









DS2760 pdf, datenblatt
DS2760
COC – Charge Overcurrent Flag. When set to 1, this bit indicates the battery pack has experienced a
charge-direction overcurrent condition. This bit must be reset by the host system.
DOC – Discharge Overcurrent Flag. When set to 1, this bit indicates the battery pack has experienced a
discharge-direction overcurrent condition. This bit must be reset by the host system.
CC CC Pin Mirror. This read-only bit mirrors the state of the CC output pin.
DC – DC Pin Mirror. This read-only bit mirrors the state of the DC output pin.
CE – Charge Enable. Writing a 0 to this bit disables charging ( CC output high, external charge FET off)
regardless of cell or pack conditions. Writing a 1 to this bit enables charging, subject to override by the
presence of any protection conditions. The DS2760 automatically sets this bit to 1 when it transitions
from Sleep Mode to Active Mode.
DE – Discharge Enable. Writing a 0 to this bit disables discharging ( DC output high, external discharge
FET off) regardless of cell or pack conditions. Writing a 1 to this bit enables discharging, subject to
override by the presence of any protection conditions. The DS2760 automatically sets this bit to 1 when
it transitions from Sleep Mode to Active Mode.
STATUS REGISTER
The default values for the Status Register bits are stored in lockable EEPROM in the corresponding bits
of address 31h. A Recall Data command for EEPROM block 1 recalls the default values into the Status
Register bits. The format of the Status Register is shown in Figure 10. The function of each bit is
described in detail in the following paragraphs.
STATUS REGISTER FORMAT – Figure 10
Address 01
bit 7 bit 6 bit 5 bit 4 bit 3 bit 2 bit 1 bit 0
X X PMOD RNAOP SWEN X X X
PMOD – Sleep Mode Enable. A value of 1 in this bit enables the DS2760 to enter Sleep Mode when the
DQ line goes low for greater than 2 seconds and leave Sleep Mode when the DQ line goes high. A value
of 0 disables DQ-related transitions into and out of Sleep Mode. This bit is read-only. The desired
default value should be set in bit 5 of address 31h.
RNAOP – Read Net Address Opcode. A value of 0 in this bit sets the opcode for the Read Net Address
command to 33h, while a 1 sets the opcode to 39h. This bit is read-only. The desired default value should
be set in bit 4 of address 31h.
SWEN - SWAP Command Enable. A value of 1 in this bit location enables the recognition of a SWAP
command. If set to 0, SWAP commands are ignored. The desired default value should be set in bit 3 of
address 31h. This bit is read-only.
X – Reserved bits.
12 of 25

12 Page





SeitenGesamt 25 Seiten
PDF Download[ DS2760 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
DS276Low Power Transceiver ChipDallas Semiconducotr
Dallas Semiconducotr
DS2760High Precision Li-Ion Battery MonitorDallas Semiconducotr
Dallas Semiconducotr
DS2760EHigh Precision Li-Ion Battery MonitorDallas Semiconducotr
Dallas Semiconducotr
DS2760E-025High Precision Li-Ion Battery MonitorDallas Semiconducotr
Dallas Semiconducotr
DS2760EAHigh Precision Li-Ion Battery MonitorDallas Semiconducotr
Dallas Semiconducotr

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche