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参数资料
| 型号： | DS2777G+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 43/46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： | 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
Data Order
A byte of data consists of 8 bits ordered MSb first. The
LSb of each byte is followed by the acknowledge bit.
The DS2777/DS2778 registers composed of multibyte
values are ordered MSB first. The MSB of multibyte reg-
isters is stored on even data memory addresses.
Slave Address
A bus master initiates communication with a slave
device by issuing a START condition followed by a
slave address (SAddr) and the read/write (R/ W ) bit.
When the bus is idle, the DS2777/DS2778 continuously
monitor for a START condition followed by its slave
address. When the DS2777/DS2778 receive a slave
address that matches the value in its Programmable
Slave Address register, they respond with an acknowl-
edge bit during the clock period following the R/ W bit.
The 7-bit Programmable Slave Address register is fac-
tory programmed to 1011001. The slave address can
be reprogrammed. See the Programmable Slave
Address section for details.
Programmable Slave Address
The 2-wire slave address of the DS2777/DS2778 is
stored in the parameter EEPROM block, address 80h.
Programming the slave address requires a write to 80h
with the desired slave address. The new slave address
value is effective following the write to 80h and must be
used to address the DS2777/DS2778 on subsequent
bus transactions. The slave address value is not stored
to EEPROM until a Copy EEPROM Block 1 command is
executed. Prior to executing the Copy Data command,
selects a read transaction, with the subsequent bytes
being read from the slave by the master.
Bus Timing
The DS2777/DS2778 are compatible with any bus tim-
ing up to 400kHz. No special configuration is required
to operate at any speed.
2-Wire Command Protocols
The command protocols involve several transaction for-
mats. The simplest format consists of the master writing
the START bit, slave address, R/ W bit, and then moni-
toring the acknowledge bit for presence of the
DS2777/DS2778. More complex formats such as the
Write Data, Read Data, and function command proto-
cols write data, read data, and execute device-specific
operations. All bytes in each command format require
the slave or host to return an acknowledge bit before
continuing with the next byte. Each function command
definition outlines the required transaction format. Table
14 applies to the transaction formats.
Basic Transaction Formats
Write: S SAddr W A MAddr A Data0 A P
A write transaction transfers one or more data bytes to
the DS2777/DS2778. The data transfer begins at the
memory address supplied in the MAddr byte. Control of
the SDA signal is retained by the master throughout the
transaction, except for the acknowledge cycles.
Read: S SAddr W A MAddr A Sr SAddr R A Data0 N P
power cycling the DS2777/DS2778 restores the original
Write Portion
Read Portion
slave address value. The data format of the slave
address value in address 80h is shown in the Slave
Address Format (80h) section.
Read/Write Bit
The R/ W bit following the slave address determines the
data direction of subsequent bytes in the transfer. R/ W
= 0 selects a write transaction, with the subsequent
bytes being written by the master to the slave. R/ W = 1
A read transaction transfers one or more bytes from the
DS2777/DS2778. Read transactions are composed of
two parts with a write portion followed by a read portion
and are, therefore, inherently longer than a write trans-
action. The write portion communicates the starting
point for the read operation. The read portion follows
immediately, beginning with a repeated START, and
slave address with R/ W set to a 1. Control of SDA is
Slave Address Format (80h)
BIT 7
A6
BIT 6
A5
BIT 5
A4
BIT 4
A3
BIT 3
A2
BIT 2
A1
BIT 1
A0
BIT 0
X
Bits 7 to 1: Slave Address (A[6:0]). A[6:0] contains the 7-bit slave address of the DS2777/DS2778. The factory
default is 1011001b.
Bit 0: Reserved.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS2777G+ | 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 |
| DS2777G+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 2W 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 |
| DS2777G+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 |
| DS2777G+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 |
| DS2777GR | 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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