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参数资料
| 型号： | DS2777G+T&R |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 36/46页 |
| 文件大小： | 0K |
| 描述： | IC FUEL GAUGE LI+ 2CELL 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： | 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： | 带卷 (TR) |
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2-Cell, Stand-Alone, Li+ Fuel-Gauge IC with
Protector and Optional SHA-1 Authentication
also used to provide verification of error-free data trans-
fer as each EEPROM page is sent to the master during
a Read Data/Generate CRC command and for the
8 bytes of information in the status memory field.
In each case where a CRC is used for data transfer val-
idation, the bus master must calculate the CRC value
the low period as a reset pulse, effectively terminating
the transaction.
Transaction Sequence
The protocol for accessing the DS2775/DS2776
through the 1-Wire port is as follows:
using the same polynomial function and compare the
calculated value to the CRC either stored in the
DS2775/DS2776 net address or computed by the
DS2775/DS2776. The comparison of CRC values and
decision to continue with an operation are determined
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Initialization
Net Address Commands
Function Command(s)
Data Transfer (not all commands have data transfer)
entirely by the bus master. There is no circuitry in the
DS2775/DS2776 that prevents a command sequence
from proceeding if the stored or calculated CRC from
the DS2775/DS2776 and the calculated CRC from the
host do not match.
Hardware Configuration
Because the 1-Wire bus has only a single line, it is
important that each device on the bus be able to drive
it at the appropriate time. To facilitate this, each device
attached to the 1-Wire bus must connect to the bus with
open-drain or three-state output drivers. The DS2775/
DS2776 use an open-drain output driver as part of the
bidirectional interface circuitry shown in Figure 24. If a
bidirectional pin is not available on the bus master,
separate output and input pins can be connected
together.
The 1-Wire bus must have a pullup resistor at the bus
master end. A value of between 2k Ω and 5k Ω is recom-
mended. The idle state for the 1-Wire bus is high. If, for
any reason, a bus transaction must be suspended, the
bus must be left in the idle state to properly resume the
transaction later. Note that if the bus is left low for more
than t LOW0 , slave devices on the bus begin to interpret
V PULLUP
(2.0V TO 5.5V)
BUS MASTER
4.7k Ω
Rx
Initialization
All transactions of the 1-Wire bus begin with an initial-
ization sequence consisting of a reset pulse transmitted
by the bus master, followed by a presence pulse simul-
taneously transmitted by the DS2775/DS2776 and any
other slaves on the bus. The presence pulse tells the
bus master that one or more devices are on the bus
and ready to operate. For more details, see the 1-Wire
Signaling section.
Net Address Commands
Once the bus master has detected the presence of one
or more slaves, it can issue one of the net address
commands described in the following sections. The
name of each Net Address command (ROM command)
is followed by the 8-bit op code for that command in
square brackets.
Read Net Address [33h]
This command allows the bus master to read the
DS2775/DS2776’s 1-Wire net address. This command
can only be used if there is a single slave on the bus. If
more than one slave is present, a data collision occurs
when all slaves try to transmit at the same time (open
drain produces a wired-AND result).
DS2775/DS2776 1-Wire PORT (DQ)
Rx
100nA
Tx
Rx = RECEIVE
(TYP)
100 Ω MOSFET
Tx
Tx = TRANSMIT
Figure 24. 1-Wire Bus Interface Circuitry
36
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2777K | 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 |
| DS2778 | 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 |
| DS2778EVKIT+ | 制造商:Maxim Integrated Products 功能描述:DS2778 EVAL KIT - Boxed Product (Development Kits) |
| DS2778G | 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 |
| DS2778G+ | 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 |
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