参数资料
| 型号： | SC810ULTRT |
| 厂商： | Semtech |
| 文件页数： | 13/20页 |
| 文件大小： | 0K |
| 描述： | IC BATTERY MANAGEMENT |
| 标准包装： | 1 |
| 系列： | * |
| 其它名称： | SC810ULDKR |
SC810
Applications Information (continued)
1.8V or as high as a fully charged battery. While a con-
nected GPIO port is configured as an output, the proces-
sor writes 0 to select ENB low-range, and 1 to select
high-range. The GPIO port is configured as an input to
is unnecessary to drive ENB low to restore tri-level opera-
tion; simply configure the GPIO as an input. When the ENB
selection changes from high-range to mid- or low-range, a
new charge cycle begins and STATB goes low.
select mid-range.
Note that if a GPIO with a weak pull-up input configura-
ENB can also be permanently grounded to select low-
range or left unconnected to select mid-range if it will not
be necessary to change the level selection.
The equivalent circuit looking into the ENB pin is a vari-
able resistance, minimum 15kΩ, to an approximately 1V
source. The input will float to mid range whenever the
external driver sinks or sources less than 5μA, a common
worst-case characteristic of a high impedance or a weak
pull-up or pull-down GPIO configured as an input. The
driving GPIO must be able to sink at least 25μA or source
at least 50μA to ensure a low or high state, respectively.
(See the Electrical Characteristics table.)
tion is used, its pull-up current will flow from the GPIO into
the ENB pin while it is floating to mid-range. Since the
GPIO is driving a 1V equivalent voltage source through a
resistance (looking into ENB), this current is small — pos-
sibly less than 1 μ A. Nevertheless, this current is drawn
from the GPIO peripheral power supply and, therefore,
from the battery after termination. See the next section,
Monitor State for more information. For this reason, it is
preferable that the GPIO chosen to operate the ENB pin
should provide a true high impedance (CMOS) configura-
tion or a weak pull-down when configured as an input.
When pulled below the float voltage, the ENB pin output
current is sourced from VIN (the charging adapter), not
from the battery.
With the ENB input voltage permitted to float to mid-
range, the charger is enabled but it will turn off its output
following charge termination and will enter the monitor
state. This state is explained in the next section. Mid-
range can be selected either by floating the input (sourc-
ing or sinking less than 5μA) or by being externally forced
such that V ENB falls within the midrange limits specified in
the Electrical Characteristics table.
While driven low (V ENB < Max V IL ), the charger is enabled
and will continue to float-charge the battery following
termination. If the charger is already in monitor state fol-
lowing a previous termination, it will exit the monitor state
and begin float-charging.
While ENB is driven high (V ENB > Min V IH ), the charger is dis-
abled and the ENB input pin enters a high impedance state,
suspending tri-level functionality. The specified high level
input current I IH is required only until a high level is recog-
nized by the SC810 internal logic. The tri-level float circuitry
is then disabled and the ENB input becomes high imped-
ance. Once forced high, the ENB pin will not float to mid
range. To restore tri-level operation, the ENB pin must first
be pulled down to mid or low range (at least to
V ENB < Max V IM ), then, if desired, released (by reconfiguring
the GPIO as an input) to select mid-range. If the ENB GPIO
Monitor State
If the ENB pin is floating, the charger output and STATB pin
will turn off and the device will enter the monitor state
when a charge cycle is complete. If the battery voltage
falls below the re-charge threshold (V CV - V ReQ ) while in the
monitor state, the charger will automatically initiate a re-
charge cycle. The battery leakage current during monitor
state is no more than 1 μ A over temperature and typically
less than 0.1 μ A at room temperature.
While in the monitor state, the ENB tri-level input pin
remains fully active, and although in midrange, is sensitive
to both high and low levels. The SC810 can be forced from
the monitor state (no float-charging) directly to float-
charging operation by driving ENB low. This operation will
turn on the charger output, but will not assert the STATB
output. If the ENB pin is again allowed to float to mid-
range, the charger will remain on only until the output
current becomes less than the termination current, and
charging terminates. The SC810 turns off its charging
output and returns to the monitor state within a millisec-
ond. This forced re-charge behavior is useful for periodi-
cally testing the battery state-of-charge and topping-off
the battery, without float-charging and without requiring
the battery to discharge to the automatic re-charge
has a weak pull-down when configured as an input, then it
13
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相关代理商/技术参数 |
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| SC811 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Adapter/USB Tri-Mode Single-cell Li-ion Charger |
| SC8-11 | 制造商:WM BERG 功能描述: |
| SC811EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:Adapter/USB Tri-Mode Single-cell Li-ion Charger |
| SC811I-260B | 制造商:Supermicro Computer Inc 功能描述:CHASSIS;1U;260W;UP P4;2XFIXED |
| SC811ULTRT | 功能描述:IC BATTERY MANAGEMENT RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:* 其它有关文件:STC3100 View All Specifications 特色产品:STC3100 - Battery Monitor IC 标准包装:4,000 系列:- 功能:燃料，电量检测计/监控器 电池化学:锂离子（Li-Ion） 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商设备封装:8-MiniSO 包装:带卷 (TR) 其它名称:497-10526-2 |
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