Features

1 series lithium -ion battery fuel meter application

Format or detachable battery pack

Use PACK+, PACK-, and T battery

terminal

Micro controller peripherals provided:

-Cytecid battery fuel meter

-The temperature report of the internal temperature sensor of the system

- Low battery power interruption warning

- Battery insertion indicator [123 ]

-96 bytes of non -easy -to -miss notes of notes

Patented battery -based fuel meter impedance track #8482; Technology

- Simulation battery discharge curve curve The accurate time of air prediction

- Automatic adjustment of battery aging, self -discharge of batteries, and low temperature/rate of temperature

-The low -value sensing resistor (10 m or below) [ 123]

I2C #8482; interface microcontroller port connected to the system

#8226 12 stitches 2.5 mm × 4 mm package

Application

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smartphone

PDA system

digital camera and camera

Handheld terminal [123 ]

MP3 or multimedia player

Instructions

Texas instrument BQ27500 system side lithium ion battery fuel meter is a microcontroller peripheral equipment, which is a single battery lithium ion battery battery The group provides fuel measurement. The device does not require system microcontroller firmware development. BQ27500 is located on the system motherboard, managing embedded batteries (non -moving) or mobile battery packs.

BQ27500 uses a patented impedance orbit #8482; fuel metering algorithm, and provides information such as the remaining battery capacity (mia), the charging status (%), the operation to the air (minute), the battery voltage (MV) And temperature (℃).

Use BQ27500 to measure the battery fuel meter with only components+(P+), component- (P-), and thermistor (T) to connect to the mobile battery pack or embedded battery.

General description

BQ27500 accurately predicts the battery capacity and other operating characteristics of a single lithium -based rechargeable battery. It can be asked by the system processor to provide community information, such as charging status (SOC), Clear time (TTE) and full time (TTF).

Access information through a series of commands called standard commands. Other extended command sets provide more features. The two sets of commands indicated by the general format command () are used to read and write the information contained in the BQ27500 control and status register and its data flash memory position. The command uses the BQ27500 I2C serial communication engine to send from the system to the instrument, and can be executed during application development, component manufacturing or terminal device operation.

Unit information is stored in BQ27500, which is not susceptible flash memory. During application development, many of the data flashing positions can be accessed. During the running of the terminal device, you cannot access them directly. Visit these positions can be implemented by using BQ27500 supporting assessment software, through a single command or through a series of data flash memory access commands. To access the required data flash memory position, you must know the correct data flashing subclasses and offset.

BQ27500 provides a 96 -byte user programming data flash memory, divided into three 32 -byte blocks: manufacturer information block A, manufacturer information block B, and manufacturer information block C. This data space is accessible through the data flash memory interface.

The key to BQ27500 high -precision fuel measurement prediction is the proprietary impedance trajectory of Texas instruments #8482; algorithm. This algorithm uses battery measurement, characteristics and attributes to create charging state predictions. Under various operating conditions and the entire service life of the battery, the prediction can achieve an error of less than 1%.

BQ27500 Monitizes a small value series sensor (5 MΩ to 20 MΩ, typical values) between a small value series sensor (5 MΩ to 20 MΩ, typical values) located between the system vehicle speed sensor and the battery group terminal. When the battery is connected to the BQ27500, the battery voltage is calculated according to the battery current, the battery opening voltage (OCV) and the battery voltage under the load conditions.

BQ27500's external temperature sensing uses a high -precision negative temperature coefficient (NTC) thermistor (R25 10.0K ± 1%, B25/85 3435K ± 1%) for optimization (such as SemiteC NTC 103AT). BQ27500 can also be configured to use its internal temperature sensor. When using an external transistor, you need to install a 18.2k -pull -up resistor between the BT/TOUT and the TS pin. BQ27500 uses the temperature monitoring battery group environment for fuel measurement and battery protection function.

In order to minimize power consumption, BQ27500 has different power modes: normal, sleep+, sleep, sleep, and BAT insertion inspection. BQ27500 is automatically passed between these modes according to the occurrence of specific events, although the system processor can directly start some of the modes. For more details, see Section 5.7, power mode.

Data command

[12]3] Standard data command

BQ27500 uses a series of 2 -byte standard commands to support system reading and writing battery information. Each standard command has a related command code pair, as shown in Table 4-1. Because each command consists of two bytes of data, two continuous I2C transmission must be performed to start the command function and read or write the corresponding two bytes of data. Section 7 I2C interface describes other options used to transmit data, such as fake offing. The standard commands can be accessed in normal operations.

Data flash memory interface

Access data flash memory

BQ27500 Data flash memory is a non -easy -to -loss memory, including BQ27500 initialization, default default , Unit state, calibration, configuration and user information. According to the working mode and access of the BQ27500, you can access data flash memory in several different ways.

The data flash memory position read by the system can be easily accessible by specific instructions, as described in Section 4.1 Data Command ". These commands are available when BQ27500 is in non -seal or seal mode.

However