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参数资料
| 型号： | DS2775G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 41/46页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE LI+ 2CELL 14-TDFN |
| 产品培训模块： | 1-Wire Communications Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 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： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
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-one and write-zero. All write time slots must be
t SLOT in duration with a 1μs minimum recovery time,
t REC , between cycles. The DS2775/DS2776 sample the
1-Wire bus line between t LOW1_MAX and t LOW0_MIN
after the line falls. If the line is high when sampled, a
write-one occurs. If the line is low when sampled, a
write-zero occurs. Figure 30 illustrates the sample win-
dow. For the bus master to generate a write-one time
slot, the bus line must be pulled low and then released,
allowing the line to be pulled high less than t RDV after
the start of the write time slot. For the host to generate a
write-zero 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 1μs and then release it to allow the DS2775/
DS2776 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 DS2775/DS2776
release the bus line and allow it to be pulled high by the
external pullup resistor. All read time slots must be t SLOT
in duration with a 1μs minimum recovery time, t REC ,
between cycles. See Figure 30 and the timing specifica-
tions in the Electrical Characteristics: 1-Wire Interface,
Standard/Overdrive tables for more information.
2-Wire Bus System
The 2-wire bus system supports operation as a slave-
only device in a single or multislave and single or multi-
master system. Up to 128 slave devices can share the
bus by uniquely setting the 7-bit slave address. The
2-wire interface consists of a serial data line (SDA) and
serial clock line (SCL). SDA and SCL provide bidirec-
tional communication between the DS2777/DS2778
slave device and a master device at speeds up to
400kHz. The DS2777/DS2778’s SDA pin operates bidi-
rectionally, that is, when the DS2777/DS2778 receive
data, SDA operates as an input, and when the
DS2777/DS2778 return data, SDA operates as an open-
drain output with the host system providing a resistive
pullup. The DS2777/DS2778 always operate as a slave
device, receiving and transmitting data under the con-
trol of a master device. The master initiates all transac-
tions on the bus and generates the SCL signal as well
as the START and STOP bits which begin and end
each transaction.
Bit Transfer
One data bit is transferred during each SCL clock cycle
with the cycle defined by SCL transitioning low-to-high
and then high-to-low. The SDA logic level must remain
stable during the high period of the SCL clock pulse.
Any change in SDA when SCL is high is interpreted as
a START (S) or STOP (P) control signal.
Bus Idle
The bus is defined to be idle, or not busy, when no
master device has control. Both SDA and SCL remain
high when the bus is idle. The STOP condition is the
proper method to return the bus to the idle state.
START and STOP Conditions
The master initiates transactions with a START condi-
tion by forcing a high-to-low transition on SDA while
SCL is high. The master terminates a transaction with a
STOP condition, a low-to-high transition on SDA while
SCL is high. A repeated START condition (Sr) can be
used in place of a STOP then START sequence to ter-
minate one transaction and begin another without
returning the bus to the idle state. In multimaster sys-
tems, a repeated START allows the master to retain
control of the bus. The START and STOP conditions are
the only bus activities in which the SDA transitions
when SCL is high.
Acknowledge Bits
Each byte of a data transfer is acknowledged with an
acknowledge bit (A) or a not acknowledge bit (N). Both
the master and the DS2777/DS2778 slave generate
acknowledge bits. To generate an acknowledge, the
receiving device must pull SDA low before the rising
edge of the acknowledge-related clock pulse (9th
pulse) and keep it low until SCL returns low. To gener-
ate a not acknowledge (also called NACK), the receiver
releases SDA before the rising edge of the acknowl-
edge-related clock pulse and leaves SDA high until
SCL returns low. Monitoring the acknowledge bits
allows for detection of unsuccessful data transfers. An
unsuccessful data transfer can occur if a receiving
device is busy or if a system fault has occurred. In the
event of an unsuccessful data transfer, the bus master
should reattempt communication.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2775G+ | 功能描述:电池管理 2-Cell Stand-Alone Li+ 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 |
| DS2775G+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:2S FG PROT 1W 14L 3X5 TDFN T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC FUEL GAUGE LI+ 2CELL 14-TDFN 制造商:Maxim Integrated Products 功能描述:Battery Management 2-Cell Stand-Alone Li+ Fuel-Gauge |
| DS2775G+T&R | 功能描述:电池管理 2-Cell Stand-Alone Li+ 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 |
| DS2775G+TR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication |
| DS2775GR | 制造商:MAXIM 制造商全称:Maxim Integrated Products 功能描述:2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with Protector and Optional SHA-1 Authentication |
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