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| 型号： | DS2756E-5+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 25/27页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE BATT 3V 8-TSSOP |
| 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： | 3 V ~ 5.5 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： | 带卷 (TR) |
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DS2756: High-Accuracy Battery Fuel Gauge with Programmable Suspend Mode
I/O SIGNALING
The 1-Wire bus requires strict signaling protocols to ensure data integrity. The four protocols or signaling types
used are:
1)
2)
3)
4)
Initialization sequence (Reset Pulse followed by Presence Pulse)
Write 0
Write 1
Read Data
All signaling is initiated by the bus master. Except for the Presence Pulse, all falling edges are created by the bus
master. The initialization sequence required to begin communication with the DS2756 is shown in Figure 22. A
presence pulse following a reset pulse indicates the DS2756 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 DS2756 waits for t PDH and then transmits the Presence Pulse for t PDL .
Figure 22. 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
DS2756 ACTIVE LOW
RESISTOR PULLUP
DS2756 ACTIVE LOW
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 ? s minimum recovery time, t REC , between cycles.
The bus master generates a write 1 time slot by pulling 1-Wire bus line low for t LOW1 and then releasing it. The bus
must be pulled high within 15 ? s in Standard mode or 2 ? s in Overdrive mode after the start of the write-time slot.
The bus master generates a write 0 time slot by pulling 1-Wire bus line low and then holding it low for t LOW0 , or up to
the end of the write-time slot.
The DS2756 samples the 1-Wire bus after the line falls, sampling occurs between 15 ? s and 60 ? s in Standard
mode and between 2 ? s and 6 ? s in Overdrive mode. If the line is high when sampled by the DS2756, a write 1
occurs, that is, the DS2756 accepts the bit value to be a 1. If the line is low when sampled, a write 0 occurs, that is,
the DS2756 accepts the bit value to be a 0. See Figure 23 for more information.
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 generated read-time slot results in a read 1 and read 0 depending on the data presented by the
DS2756. All read-time slots must be t SLOT in duration with a 1 ? s minimum recovery time, t REC , between cycles.
The bus master initiates a read-time slot by pulling the bus line low for at least 1 ? s and then releasing it to allow the
DS2756 to present valid data. The DS2756 generates a read 0 by holding the line low. The line is held low for at
least the Read Data Valid time (t RDV ) from the start of the read-time slot. The DS2756 releases the bus line and
allows it to be pulled high by the external pullup resistor some time after t RDV but before the end of the read-time
slot. A read 1 is generated by not holding the line low after the time slot is initiated by the master. The line is
allowing it to be pulled high as soon as it is released by the master. The bus master must sample the bus after
initializing the time slot and before t RDV to read the data value transmitted by the DS2756. Sampling should occur
as close to t RDV as possible to allow for the rise time of the passive pullup 1-Wire bus. See Figure 23 for more
information.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2756EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-ACCURACY BATTERY FUEL GAUGE WITH PROGRAMMABLE SUSPEND M - Boxed Product (Development Kits) |
| DS2756K | 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 |
| DS275E | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
| DS275E/T&R | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:IC TXRX LINE-PWR RS232 14-TSSOP |
| DS275E/T&R | 功能描述:RS-232接口集成电路 RoHS:否 制造商:Exar 数据速率:52 Mbps 工作电源电压:5 V 电源电流:300 mA 工作温度范围:- 40 C to + 85 C 安装风格:SMD/SMT 封装 / 箱体:LQFP-100 封装: |
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