參數(shù)資料
型號(hào)： DS2760E-025
英文描述： High Precision Li-Ion Battery Monitor
中文描述： 高精度鋰離子電池監(jiān)視器
文件頁(yè)數(shù)： 6/25頁(yè)
文件大?。?/td> 126K
代理商： DS2760E-025
DS2760
6 of 25
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 V
UV
for t
UVD
(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
Activation
Condition
Name
Threshold
Delay
Overvoltage
V
IN
> V
OV
t
OVD
Undervoltage
V
IN
< V
UV
t
UVD
Response
CC
high
CC
,
DC
high,
Sleep Mode
CC
,
DC
high
DC
high
DC
high
Release
Threshold
V
IN
< V
CE
V
PLS
> VDD
(charger connected)
V
PLS
< VDD - V
TP(2)
V
PLS
> VDD - V
TP(3)
V
PLS
> VDD - V
TP(3)
Overcurrent, Charge
Overcurrent, Discharge
Short Circuit
V
IS
= V
IS1
– V
IS2
. Logic high = V
PLS
for
CC
and VDD for
DC
.
All voltages are with respect to VSS. I
SNS
references current delivered from pin SNS.
V
IS
> V
OC(1)
V
IS
< -V
OC(1)
V
SNS
> V
SC
t
OCD
t
OCD
t
SCD
(1)
for the internal sense resistor configuration, the overcurrent thresholds are expressed in terms of
current: I
SNS
> I
OC
for charge direction and I
SNS
< -I
OC
for discharge direction
(2) with test current I
TST
current flowing from PLS to VSS (pull-down on PLS)
(3) with test current I
TST
current flowing from VDD to PLS (pull-up on PLS)
Overvoltage.
If the voltage of the cell exceeds overvoltage threshold V
OV
for a period longer than
overvoltage delay t
OVD
, 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 V
CE
, the DS2760 turns the
charge FET back on (unless another protection condition prevents it). Discharging remains enabled
during overvoltage.
相關(guān)PDF資料
PDF描述
DS2760XA-025 High Precision Li-Ion Battery Monitor
DS2760 High Precision Li-Ion Battery Monitor
DS2760E High Precision Li-Ion Battery Monitor
DS2760EA High Precision Li-Ion Battery Monitor
DS2760T High Precision Li-Ion Battery Monitor
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2760E8000001/T&R 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
DS2760EA 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High Precision Li-Ion Battery Monitor
DS2760EA-025 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:High Precision Li-Ion Battery Monitor
DS2760K 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Li＜SUP＞+＜/SUP＞ Battery Monitor Evaluation Kit
DS2760PALM 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Fuel Pack Demonstration Software for Palm III and m100 PDAs
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