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| 型号： | DS2781E+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 29/31页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 8TSSOP |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 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 ~ 10 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 8-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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DS2781
1-Wire SIGNALING
The 1-Wire bus requires strict signaling protocols to ensure data integrity. The four protocols used by the DS2781
are as follows: the initialization sequence (reset pulse followed by presence pulse), write 0, write 1, and read data.
All of these types of signaling except the presence pulse are initiated by the bus master.
The initialization sequence required to begin any communication with the DS2781 is shown in Figure 26. A
presence pulse following a reset pulse indicates that the DS2781 is ready to accept a net address command. The
bus master transmits (Tx) a reset pulse for t RSTL . The bus master then releases the line and goes into receive mode
(Rx). The 1-Wire bus line is then pulled high by the pullup resistor. After detecting the rising edge on the DQ pin,
the DS2781 waits for t PDH and then transmits the presence pulse for t PDL .
Figure 26. 1-Wire Initialization Sequence
t RSTL
t PDH
t PDL
t RSTH
PACK+
DQ
PACK-
LINE TYPE LEGEND:
BUS MASTER ACTIVE LOW
BOTH BUS MASTER AND
DS2781 ACTIVE LOW
DS2781 ACTIVE LOW
RESISTOR PULLUP
WRITE-TIME SLOTS
A write-time slot is initiated when the bus master pulls the 1-Wire bus from a logic-high (inactive) level to a logic-low
level. There are two types of write-time slots: write 1 and write 0. All write-time slots must be t SLOT in duration with a
1 μ s minimum recovery time, t REC , between cycles. The DS2781 samples the 1-Wire bus line between 15 μ s and
60 μ s (between 2 μ s and 6 μ s for overdrive speed) after the line falls. If the line is high when sampled, a write 1
occurs. If the line is low when sampled, a write 0 occurs (see Figure 27). For the bus master to generate a write 1
time slot, the bus line must be pulled low and then released, allowing the line to be pulled high within 15 μ s (2 μ s for
overdrive speed) after the start of the write-time slot. For the host to generate a write 0 time slot, the bus line must
be pulled low and held low for the duration of the write-time slot.
READ-TIME SLOTS
A read-time slot is initiated when the bus master pulls the 1-Wire bus line from a logic-high level to a logic-low level.
The bus master must keep the bus line low for at least 1 μ s and then release it to allow the DS2781 to present valid
data. The bus master can then sample the data t RDV from the start of the read-time slot. By the end of the read-time
slot, the DS2781 releases the bus line and allows it to be pulled high by the external pullup resistor. All read-time
slots must be t SLOT in duration with a 1 μ s minimum recovery time, t REC , between cycles. See Figure 27 for more
information.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2781E+ | 功能描述:电池管理 1-2 Cell Stand-Alone 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 |
| DS2781E+T&R | 制造商:Maxim Integrated Products 功能描述:FUEL GAUGE 制造商:Maxim Integrated Products 功能描述:STANDALONE FUEL GAUGE IC 8TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE BATT 8TSSOP |
| DS2781E+T&R | 功能描述:电池管理 1-2 Cell Stand-Alone 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 |
| DS2781E+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:1-Cell or 2-Cell Standalone Fuel Gauge IC |
| DS2781E-C1+T&R | 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 |
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