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参数资料
| 型号： | DS2784G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/43页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE STND-ALONE 14-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 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 ~ 4.6 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-WFDFN 裸露焊盘 |
| 供应商设备封装： | 14-TDFN-EP（3x5） |
| 包装： | 带卷 (TR) |
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DS2784: 1-Cell Stand-Alone Fuel Gauge IC with Li+ Protector and SHA-1 Authentication
ACR Housekeeping
The ACR value is adjusted occasionally to maintain the coulomb count within the model curve boundaries. When
the battery is charged to full (CHGTF set), the ACR is set equal to the age scaled full lookup value at the present
temperature. If a learn cycle is in progress, correction of the ACR value occurs after the age scalar (AS) is updated.
When an empty condition is detected (LEARNF and/or AEF set), the ACR adjustment is conditional:
? If the AEF is set and the LEARNF is not set, then the active-empty point was not detected. The battery is likely
below the active-empty capacity of the model. The ACR is set to the active-empty model value at present temp
only if it is greater than the active-empty model value at present temp.
? If the AEF is set, the LEARNF is not set, and the ACR is below the active-empty model value at present temp
the ACR is NOT updated.
? If the LEARNF is set, then the battery is at the active-empty point and the ACR is set to the active-empty model
value.
Full Detect
Full detection occurs when the voltage (V) readings remain continuously above the charge voltage (VCHG)
threshold for the duration of two average current (IAVG) readings, and both IAVG readings are below terminating
current (IMIN). The two consecutive IAVG readings must also be positive and nonzero (> 16 LSB). This ensures
that removing the battery from the charger does not result in a false detection of full. Full detect sets the charge to
full (CHGTF) bit in the status register.
Active-Empty Point Detect
Active-empty point detection occurs when the voltage register drops below the VAE threshold AND the two
previous current readings are above IAE. This captures the event of the battery reaching the active-empty point.
Note that the two previous current readings must be negative and greater in magnitude than IAE, that is, a larger
discharge current than specified by the IAE threshold. Qualifying the voltage level with the discharge rate ensures
that the active-empty point is not detected at loads much lighter than those used to construct the model. Also, the
active-empty point must not be detected when a deep discharge at a very light load is followed by a load greater
than IAE. Either case would cause a learn cycle on the following charge to include part of the standby capacity in
the measurement of the active capacity. Active-empty point detection sets the learn flag (LEARNF) bit in the status
register. Do not confuse the active-empty point with the active-empty flag. The active-empty flag is set only when
the VAE threshold is passed.
STATUS REGISTER FORMAT
The status register contains bits that report the device status. All bits are set internally. The CHGTF, AEF, SEF, and
LEARNF bits are read only. The UVF and PORF bits can be cleared by writing a zero to the bit locations.
ADDRESS 01h
BIT 7
CHGTF
BIT 6
AEF
BIT 5
SEF
BIT 4
LEARNF
BIT 3
X
BIT 2
UVF
BIT 1
PORF
BIT 0
X
CHGTF —Charge-Termination Flag. CHGTF is set to indicate that the voltage and average current register values
have persisted above the VCHG and below the IMIN thresholds sufficiently long to detect a fully charged condition.
CHGTF is cleared when RARC is less than 90%. CHGTF is read only.
AEF —Active-Empty Flag. AEF is set to indicate that the battery is at or below the active-empty point. AEF is set
when the voltage register value is less than the VAE threshold. AEF is cleared when RARC is greater than 5%.
AEF is read only.
SEF —Standby-Empty Flag. SEF is set to indicate RSRC is less than 10%. SEF is cleared when RSRC is greater
than 15%. SEF is read only.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2784K | 功能描述:电源管理IC开发工具 RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| DS2786 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Standalone OCV-Based Fuel Gauge |
| DS2786_09 | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786B | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:Stand-Alone OCV-Based Fuel Gauge |
| DS2786BEVKIT+ | 制造商:Maxim Integrated Products 功能描述:STANDALONE OCV-BASED FUEL GAUGE - Boxed Product (Development Kits) |
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