參數(shù)資料
型號(hào)： DS2770BE
英文描述： Battery Monitor and Charge Controller
中文描述： 電池充電控制器監(jiān)控
文件頁數(shù)： 6/27頁
文件大?。?/td> 272K
代理商： DS2770BE
DS2770
6 of 27
POWER MODES
The DS2770 has two possible power modes: Active Mode and Sleep Mode. While in Active Mode, the
DS2770 continually measures current, voltage, temperature, and time. Also, current flow is accumulated,
charge control is provided, and data is available to the host system. In Sleep Mode, the DS2770 ceases
these activities. The DS2770 can enter Sleep Mode only when the PMOD bit in the Status Register is set
to 1 and the following other conditions occur:
The CINI bit is set to 0 and the DQ line is held low for longer than two seconds. If a charge is in
progress, charging will immediately stop and the device will begin transition to Sleep Mode.
The CINI bit is set to 1 and the DQ line is held low for longer than two seconds. If a charge is in
progress, the DS2770 will not go into Sleep Mode until the charge operation is completed.
The DS2770 returns to Active Mode when any of the following occurs:
The DQ line is pulled high.
The voltage on VCH becomes greater than VDD (charger connection) with the CINI bit set to 1.
Once the DS2770 identifies the 2 second DQ low condition, a transition to Sleep Mode begins. This
process will take up to an additional 11 seconds before the supply current drops to I
SLEEP
levels.
The DS2770 defaults to Active Mode when power is first applied to VDD.
CHARGER FUNCTION
The DS2770 operates as a standalone charge controller supporting rechargeable lithium and NiMH
battery technologies. The battery type to be charged is selectable through the CTYPE bit of the Status
Register (0 for rechargeable lithium and 1 for NiMH). Charge control of both battery types is performed
by on/off gating of an external constant current or current-limited charge source. If the battery voltage is
less than V
LB
and a charge source is present, pin UV is driven low, signifying the need to recover the
battery at a reduced rate before fast charging can begin. In Figure 2’s application circuit, UV gates a
trickle-charge current limited by a 360 series resistor. Selection of this resistor depends on the
characteristics of the charge source. UV is driven low independent of any other state of the pack,
including pack temperature and the status of the CINI bit. UV is driven high when the battery voltage
reaches V
LB
. While trickle charging, a “charge in progress” status is indicated with (0, 1) values,
respectively, in the CSTAT1 and CSTAT0 bits of the Status Register assuming any previous charge
sequence completed status has been cleared.
Fast charging can be initiated by one of two methods:
1) Issuing a Start Charge command [B5h].
2) Introducing a charge supply on the VCH pin when the CINI bit in the Status Register is a 1.
Note that if VDD is below approximately 1.8V prior to using either initiation method, fast charge will not
start after the battery is trickle charged to V
LB
.
After initiation, the start of fast charge may be postponed if any of the following conditions exist:
The temperature is outside the valid charge window specified by T
CL
(0°C) and T
CH
(40°C).
Charge source is not present (VCH < VDD).
Conversion data is not valid (data becomes valid 110ms after waking from Sleep Mode).
Battery voltage is less than the low-battery-voltage threshold, V
LB
, (3.0V).
相關(guān)PDF資料
PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
DS2770BE/R 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Battery Monitor and Charge Controller
DS2770BE/T 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Battery Monitor and Charge Controller
DS2770BE/T&R 制造商:DALLAS 制造商全稱:Dallas Semiconductor 功能描述:Battery Monitor and Charge Controller
DS2770BE/TR 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC
DS2770BE+ 功能描述:IC BATTERY MONITOR 16-TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 功能:充電管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:3.75 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SC-74A，SOT-753 供應(yīng)商設(shè)備封裝:SOT-23-5 包裝:剪切帶 (CT) 產(chǎn)品目錄頁面:669 (CN2011-ZH PDF) 其它名稱:MCP73831T-2ACI/OTCT
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