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参数资料
| 型号： | MAX17040X+U |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/13页 |
| 文件大小： | 0K |
| 描述： | IC 2-WIRE FG W/MODEL GAUGE 9USCP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 系列： | ModelGauge™ |
| 功能： | 燃料，电量检测计/监控器 |
| 电池化学： | 锂离子（Li-Ion）、锂聚合物（Li-Pol） |
| 电源电压： | 2.5 V ~ 4.5 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 9-WFBGA，WLCSP |
| 供应商设备封装： | 9-uCSP（1.61x1.43） |
| 包装： | 管件 |
MAX17040/MAX17041
Compact, Low-Cost 1S/2S Fuel Gauges
compared to traditional coulomb counters, which suffer
from SOC drift caused by current-sense offset and cell
self-discharge. This model provides good performance
for many Li+ chemistry variants across temperature
and age. To achieve optimum performance, the
MAX17040/MAX17041 must be programmed with con-
figuration data custom to the application. Contact the
factory for details.
Fuel-Gauge Performance
The classical coulomb-counter-based fuel gauges suf-
fer from accuracy drift due to the accumulation of the
offset error in the current-sense measurement. Although
the error is often very small, the error increases over
time in such systems, cannot be eliminated, and
requires periodic corrections. The corrections are usu-
ally performed on a predefined SOC level near full or
empty. Some other systems use the relaxed battery
voltage to perform corrections. These systems deter-
mine the true SOC based on the battery voltage after a
long time of no activity. Both have the same limitation: if
the correction condition is not observed over time in the
actual application, the error in the system is boundless.
In some systems, a full charge/discharge cycle is
required to eliminate the drift error. To determine the
true accuracy of a fuel gauge, as experienced by end
users, the battery should be exercised in a dynamic
manner. The end-user accuracy cannot be understood
with only simple cycles. The MAX17040/MAX17041 do
not suffer from the drift problem since they do not rely
on the current information.
IC Power-Up
When the battery is first inserted into the system, there is
no previous knowledge about the battery’s SOC. The IC
assumes that the battery has been in a relaxed state for
the previous 30min. The first A/D voltage measurement is
translated into a best “first guess” for the SOC. Initial error
caused by the battery not being in a relaxed state fades
over time, regardless of cell loading following this initial
conversion. Because the SOC determination is conver-
gent rather than divergent (as in a coulomb counter), this
initial error does not have a long-lasting impact.
6
Quick-Start
A quick-start allows the MAX17040/MAX17041 to restart
fuel-gauge calculations in the same manner as initial
power-up of the IC. For example, if an application’s
power-up sequence is exceedingly noisy such that
excess error is introduced into the IC’s “first guess” of
SOC, the host can issue a quick-start to reduce the
error. A quick-start is initiated by a rising edge on the
EO pin when SEO is logic-low, or through software by
writing 4000h to the MODE register.
External Oscillator Control
When the SEO pin is logic-high, the MAX17040/
MAX17041 disable the 32kHz internal oscillator and rely
on external clocking from the EO pin. A precision exter-
nal clock source reduces current consumption during
normal operation.
When the SEO pin is logic-low, the EO pin becomes an
interrupt input. Any rising edge detected on EO causes
the MAX17040/MAX17041 to initiate a quick-start.
Sleep Mode
Holding both SDA and SCL logic-low forces the
MAX17040/MAX17041 into Sleep mode. While in Sleep
mode, all IC operations are halted and power drain of
the IC is greatly reduced. After exiting Sleep mode,
fuel-gauge operation continues from the point it was
halted. SDA and SCL must be held low for at least 2.5s
to guarantee transition into Sleep mode. Afterwards, a
rising edge on either SDA or SCL immediately transi-
tions the IC out of Sleep mode.
Power-On Reset (POR)
Writing a value of 0054h to the COMMAND register caus-
es the MAX17040/MAX17041 to completely reset as if
power had been removed. The reset occurs when the last
bit has been clocked in. The IC does not respond with an
I 2 C ACK after this command sequence.
Registers
All host interaction with the MAX17040/MAX17041 is
handled by writing to and reading from register loca-
tions. The MAX17040/MAX17041 have six 16-bit regis-
ters: SOC , VCELL , MODE , VERSION , RCOMP , and
COMMAND . Register reads and writes are only valid if
all 16 bits are transferred. Any write command that is
terminated early is ignored. The function of each regis-
ter is described as follows. All remaining address loca-
tions not listed in Table 1 are reserved. Data read from
reserved locations is undefined.
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17041EVKIT+ | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17041G+T | 功能描述:电池管理 1S/2S Fuel Gauge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17041G+U | 功能描述:电池管理 1S/2S Fuel Cell RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17041K | 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX17041X+ | 功能描述:电池管理 1S/2S Fuel Gauge RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
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