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| 型号： | DS2764AE+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/20页 |
| 文件大小： | 0K |
| 描述： | IC MON BATT LI-ION HP 16-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 功能： | 电池监控器 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 2.5 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 带卷 (TR) |
DS2764 High-Precision Li+ Battery Monitor With 2-Wire Interface
POWER MODES
The DS2764 has two power modes: active and sleep. While in active mode, the DS2764 continually measures
current, voltage, and temperature to provide data to the host system and to support current accumulation and Li+
safety monitoring. In sleep mode, the DS2764 ceases these activities. The DS2764 enters sleep mode when any of
the following conditions occurs:
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The PMOD bit in the Status Register has been set to 1 and both SCL and SDA are low for longer
than 2.1s (pack disconnection).
The voltage on V IN drops below undervoltage threshold V UV for t UVD (cell depletion).
The DS2764 returns to active mode when any of the following occurs:
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The PMOD bit has been set to 1 and either the SDA or SCL line is pulled high (pack connection).
The PS pin is pulled low (power switch).
The voltage on PLS becomes greater than the voltage on V DD (charger connection).
The DS2764 defaults to active mode when power is first applied.
Li+ PROTECTION CIRCUITRY
During active mode, the DS2764 constantly monitors cell voltage and current to protect the battery from overcharge
(overvoltage), overdischarge (undervoltage), and excessive charge and discharge currents (overcurrent, short
circuit). Conditions and DS2764 responses are described in the following sections and summarized in Table 1 and
Figure 4.
Table 1. Li+ Protection Conditions and DS2764 Responses
ACTIVATION
CONDITION
Overvoltage
Undervoltage
THRESHOLD
V IN > V OV
V IN < V UV
DELAY
t OVD
t UVD
RESPONSE
CC high
CC, DC high,
Sleep Mode
RELEASE THRESHOLD
V IN < V CE , or
V IS ≤ -2mV
V PLS > V DD (1)
(charger connected)
Overcurrent, Charge
Overcurrent, Discharge
Short Circuit
V IS > V OC(2)
V IS < -V OC(2)
V SNS > V SC
t OCD
t OCD
t SCD
CC, DC high
DC high
DC high
V PLS < V DD - V TP
V PLS > V DD - V TP
V PLS > V DD - V TP
(3)
(4)
(4)
V IS = V IS1 - V IS2 . Logic high = V PLS for CC and V DD for DC . All voltages are with respect to V SS . I SNS references current delivered from pin SNS.
Note 1:
Note 2:
Note 3:
Note 4:
If V DD < 2.2V, release is delayed until the recovery charge current passed from PLS to V DD charges the battery and allows V DD to
exceed 2.2V.
For the internal sense resistor configuration, the overcurrent thresholds are expressed in terms of current: I SNS > I OC for charge
direction and I SNS < -I OC for discharge direction.
With test current I TST flowing from PLS to V SS (pulldown on PLS).
With test current I TST flowing from V DD to PLS (pullup on PLS).
Overvoltage. If the cell voltage on V IN exceeds the overvoltage threshold, V OV , for a period longer than overvoltage
delay, t OVD , the DS2764 shuts off the external charge FET and sets the OV flag in the protection register. When the
cell voltage falls below charge enable threshold V CE , the DS2764 turns the charge FET back on (unless another
protection condition prevents it). Discharging remains enabled during overvoltage, and the DS2764 re-enables the
charge FET before V IN < V CE if a discharge current of -80mA (V IS ≤ -2mV) or less is detected.
Undervoltage. If the voltage of the cell drops below undervoltage threshold, V UV , for a period longer than
undervoltage delay, t UVD , the DS2764 shuts off the charge and discharge FETs, sets the UV flag in the protection
register, and enters sleep mode. The DS2764 provides a recovery charge path from PLS to V DD to power the
DS2764 by the charger when the cell is severely depleted. Once the DS2764 regains power it will enter active
mode of operation and allow full charging of the cell. The recovery charge path is disabled when the cell voltage is
above 3.0V to prevent cell overcharge through the PLS pin.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2764AR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Precision Li+ Battery Monitor with 2-Wire Interface |
| DS2764AX/R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Precision Li+ Battery Monitor with 2-Wire Interface |
| DS2764AX/T | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Precision Li+ Battery Monitor with 2-Wire Interface |
| DS2764AX/T&R | 制造商:Maxim Integrated Products 功能描述:LI+BATT MNTR 2WIRE 4.275OV BUMP - Tape and Reel |
| DS2764AX/T&R | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:High-Precision Li+ Battery Monitor with 2-Wire Interface |
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