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参数资料
| 型号： | DS2784G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 13/43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
PMOD —Power Mode Enable. A value of 1 allows the DS2784 to enter Sleep mode when DQ is low for t SLEEP . A
value of 0 disables DQ related transitions to Sleep mode.
RNAOP —Read Net Address Op Code. A value of 0 selects 33h as the op code value for the Read Net Address
command. A value of 1 selects 39h as the Read Net Address opcode value.
0 —Reserved bit, must be programmed to 0 for proper operation.
PSPIO —Power-Switch PIO Enable. A value of 1 enables the PIO pin as a power-switch input. A value of 0 disables
the power-switch input function on PIO pin. This control is independent of the PSDQ state.
PSDQ —Power-Switch DQ Enable. A value of 1 enables the DQ pin as a power-switch input. A value of 0 disables
the power-switch input function on DQ pin. This control is independent of the PSPIO state.
X —Reserved Bit.
Li+ PROTECTION CIRCUITRY
During Active mode, the DS2784 constantly monitors SNS, V IN , and V PLS to protect the battery from overvoltage
(overcharge), undervoltage (overdischarge), and excessive charge and discharge currents (overcurrent, short
circuit). Table 1 summarizes the conditions that activate the protection circuit, the response of the DS2784, and the
thresholds that release the DS2784 from a protection state.
Table 1. Li+ Protection Conditions and DS2784 Responses
CONDITION
Overvoltage
Undervoltage
Overcurrent, Charge
Overcurrent, Discharge
Short Circuit
THRESHOLD
V IN > V OV
V IN < V UV
V SNS < V COC
V SNS > V DOC
V SNS > V SC
ACTIVATION
DELAY
t OVD
t UVD
t OCD
t OCD
t SCD
RESPONSE (2)
CC Off
CC Off, DC Off,
Sleep Mode
CC Off, DC Off
DC Off
DC Off
RELEASE THRESHOLD
V IN < V CE or (V SNS > 1.2mV
and V IN < V OV )
V PLS > V IN (3)
(charger connected)
V PLS < V DD - V TP (4)
(charger removed)
V PLS > V DD - V TP (5)
(load removed)
V PLS > V DD - V TP (5)
(load removed)
With test current I flowing from PLS to V SS (pulldown on PLS) enabled.
With test current I flowing from V DD to PLS (pullup on PLS).
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
All voltages are with respect to V SS .
CC pin driven to V OLCC (V DD ) for CC off response. DC pin driven to V OLDC (V SS ) for DC off response.
If V IN < V UV when charger connection is detected, release is delayed until V IN ≥ V UV . The recovery charge path provides an internal
current limit (I RC ) to safely charge the battery. If the device does not enter sleep mode for an UV condition (UVEN=0) then the
FETs will turn on once V IN > V UV .
TST
TST
Overvoltage. If the voltage on V IN exceeds the overvoltage threshold (V OV ) for a period longer than overvoltage
delay (t OVD ), the CC pin is driven low to shut off the external-charge FET, and the OV flag in the protection register
is set. The DC output remains high during overvoltage to allow discharging. When V IN falls below the charge enable
threshold, V CE , the DS2784 turns the charge FET on by driving CC high. The DS2784 drives CC high before
V IN < V CE if a discharge condition persists with V SNS ≥ 1. 2mV and V IN < V OV .
Undervoltage. If V IN drops below the undervoltage threshold (V UV ) for a period longer than undervoltage delay
(t UVD ), the DS2784 shuts off the charge and discharge FETs and sets the UV flag in the protection register. If UVEN
is set, the DS2784 also enters Sleep mode. The DS2784 provides a current-limited recovery charge path (I RC ) from
PLS to V DD to gently charge severely depleted cells. The recovery charge path is enabled when
0 ≤ V IN < (V OV - 100mV). Once V IN reaches 2.45V (typ), the DS2784 returns to normal operation. The DS2784
transitions from Sleep to Active mode and the CC and DC outputs are driven high to turn on the charge and
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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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