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参数资料
| 型号： | DS2778G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/46页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE LI+ 2CELL 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： | 4 V ~ 9.2 V |
| 工作温度： | -20°C ~ 70°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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2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
ACTIVE
PMOD = 0
RISING EDGE ON DQ
SLEEP
PSPIO = 0
ACTIVE
PMOD = 0
UVEN = 0
RISING EDGE ON SDA OR SCL
SLEEP
PSPIO = 0
PSDQ = X
UVEN = 0
PSDQ = 0
CHARGER DETECT
CHARGER DETECT
V IN1 OR V IN2 < V UV
PULL DQ LOW
ACTIVE
PMOD = 0
V IN1 OR V IN2 < V UV
SLEEP
PSPIO = 0
ACTIVE
PMOD = 0
UVEN = 1
RISING EDGE ON SDA OR SCL
SLEEP
PSPIO = 0
PSDQ = X
UVEN = 1
PSDQ = 1
CHARGER DETECT
CHARGER DETECT
PULL PIO LOW
PULL PIO LOW
ACTIVE
PMOD = 1
PULL DQ LOW FOR t SLEEP
SLEEP
PSPIO = 1
ACTIVE
PMOD = 1
UVEN = 0
RISING EDGE ON SDA OR SCL
SLEEP
PSPIO = 1
PSDQ = X
UVEN = 0
PSDQ = 0
CHARGER DETECT
RISING EDGE ON DQ
PULL SDA AND SCL LOW
CHARGER DETECT
PULL PIO LOW
PULL DQ LOW FOR t SLEEP
FOR t SLEEP
V IN1 OR V IN2 < V UV
PULL PIO LOW
ACTIVE
PMOD = 1
UVEN = 1
V IN1 OR V IN2 < V UV
SLEEP
PSPIO = 1
PSDQ = 1
ACTIVE
PMOD = 1
UVEN = 1
RISING EDGE ON SDA OR SCL
SLEEP
PSPIO = 1
PSDQ = X
PULL DQ LOW
CHARGER DETECT
Figure 1. Sleep-Mode State Diagram for DS2775/DS2776
Li+ Protection Circuitry
During active mode, the DS2775–DS2778 constantly
monitor SNS, V IN1 , V IN2 , and PLS to protect the battery
from overvoltage (overcharge), undervoltage (overdis-
charge), and excessive charge and discharge currents
(overcurrent, short circuit). Table 1 summarizes the
conditions that activate the protection circuit, the
response of the DS2775–DS2778, and the thresholds
that release the DS2775 –DS2778 from a protection
state. Figure 3 shows Li+ protection circuitry example
waveforms.
CHARGER DETECT
PULL SDA AND SCL LOW
FOR t SLEEP
Figure 2. Sleep-Mode State Diagram for DS2777/DS2778
Overvoltage (OV)
If either of the voltages on (V IN2 - V IN1 ) or (V IN1 - V SS )
exceeds the overvoltage threshold, V OV , for a period
longer than overvoltage delay, t OVD , the CC pin is dri-
ven low to shut off the external charge FET. The DC out-
put remains high during overvoltage to allow
discharging. When (V IN2 - V IN1 ) and (V IN1 - V SS ) falls
below the charge-enable threshold, V CE , the
DS2775–DS2778 turn the charge FET on by driving CC
high. The DS2775 –DS2778 drive CC high before
[(V IN2 - V IN1 ) and (V IN1 - V SS )] < V CE if a discharge
condition persists with V SNS ≥ 1.2mV and [(V IN2 - V IN1 )
and (V IN1 - V SS )] < V OV .
12
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相关代理商/技术参数 |
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| DS2778K | 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 |
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