The other two can be pin-round feature set, the control cell repetition rate and number of batteries connected. All batteries 12, and temperature can be input at intervals of 15ms, 130ms, 500ms and check again. A series of small extracts having to drive the supply current of less battery. The amount of batteries can be among the 4-12 set. This ensures that only the actual connection diagnostic battery. XPS M140 battery A1175
The LTC6801 can be any number of stacked with each other to monitor systems with very high voltage in hundreds of individual cells, shown in Figure 4. Enable buffering the clock, the output of two signal lines connected to the battery in the nearest range of devices for input. Enable the clock winds in and out of each device, until the top of the battery. Similarly, each device is very important to the state of the output clock to send the battery to the lower end of the next state of the pin input device. State clock speed of the clock with the opening of the same may be located between 2kHz to 50kHz. If at any time any place, any battery to detect any anomaly will be responsible for damage to the battery from the device to monitor the condition of the clock will stop processing level. The static spread along the battery down to the bottom of the unit. Using a form of edge detection, any device (eg, watchdog timer or cons Capture / compare features) can be used to monitor the battery in the state of the output line at the bottom of the device. When conversion was stopped clock, the device can generate signals to the general failure of the repair. MacBook Pro 15 inch battery A1078
Provide a clock continues to line state is an important feature. Using a static logic level to indicate the total system failure is still likely to occur in the logic state failure, such failure would be responsible for the system incorrectly as usual. This will lead to failure to follow the circuit useless. When you use a synchronization program, and monitor to perform certain operations must be continuous to keep the clock running, and the system must be in the correct state, otherwise it will cease to function. Under normal (OK) status, the fault signal will not be “blocked”. To enhance protection against noise of the logic required to pack up and along the way to the LTC6801 differential synchronization. For packages of high-voltage battery, and often need to provide isolated power for the controller. When using the differential clock signals, the introduction of isolation transformer is relatively simple. Such is the design of another device to strengthen the FT / security considerations. “- 2010/2/24 19:27:11 -” A1045 PowerBook G4 15 battery
What happens if the monitoring device in question?
There is no doubt that with the redundancy to improve the monitoring of system reliability, but how can we ensure that the monitoring device itself to run it correctly? To prevent non-detection of failure modes, which is very important. To meet this requirement, LTC6801 offers Built-in self-test feature. This self-test can start the application, or 1024 cells for each completed automatically after the cycle test, automatic test 17ms time can end. Figure 2 shows the circuit and it can connect LTC6802-1 devices to enable the On-Demand to run auto-test. A single output pin provides a signal indicating that the unit whether to implement all the auto-test, and does not interrupt the battery status of the output clock. Self-test verifies four main functions. Sony VGP-BPS2 Sony VGP-BPS2A
One of the test content, tests the ADC, voltage reference and comparator work properly. To perform the test, the second internal reference voltage measured at 3 occasions. The first step the window, in a strict comparison of the baseline and the two thresholds, and does not produce distance learning. Then, the higher threshold has fallen to slightly less than the desired voltage, a second measurement reference voltage, then the comparison would result in exceeding the guidelines of tension. Finally, the threshold is lower than the desired tension, and instructions should result in an under-voltage. This can be determined with certainty, the ADC analog part works correctly, and relatively threshold can be modified and is accurate.
ADC has also tested the number of parts. Application of two test signals will result from the end of “1″ and “0″ to form a digital output reading. Code to 12 bit output will be 0xAA or 0×555. This confirms that there is no fixed ADC output bit over the top or bottom. Sony VGP-BPS2B Sony VGP-BPS2C
Connect the battery should test high voltage multiplexer. If address decoder switch fails, then one or more batteries May is omitted, while the other battery was repeated measure. Skip the battery will result in a defective battery may not be detected. Standard multiplexer others (for example, both more and more choices between the battery or switch input circuit short) is the least one of the input cell to generate more voltage or under-voltage directives. This self-test to ensure that each cell was measured, or to ensure that errors are reported.
The fourth is very important for the auto-test to determine if the battery is open. On this test run, each cell is connected to the battery with a 100uA for each side of the low absorption measured current. If the son connected to the battery open circuit, then the battery used in this part of the ADC input voltage is being absorbed down. Paired son opened on top of the next section of the measurement battery, up more tension and instructions are marked. Sony VGP-BPL8 Sony VGP-BPL8A
These courses self-test to improve system reliability. In examining the implementation of the monitoring device can be identified with greater confidence that all things are in good working condition.
Around the entrance temperature
To understand the state of battery charge of each section, the lithium-ion working temperature is an important factor. Temperature by the LTC6802-1 devices for battery management etc with accuracy. There are two pieces of fault LTC6801 monitor the temperature of the gross inflow. The reason why these views are harsh, because the temperature of the input voltage pin VREF with only / 2 or 1.5V threshold were compared. If the input voltage exceeds 1.5V, then it is considered in good condition, if you enter less than the threshold, it was considered that there is a fault. Divider of Figure 5, the form of resettlement such as temperature sensing thermistor and resistors, can form a high temperature single / Monitoring low. If the temperature or the temperature exceeds a specific predetermined range, then the state of the output clock on interrupt, the method used and the occurrence of the failure of the battery voltage is used in the same way. Sony VGP-BPS9 Sony VGP-BPS9/B
Conclusion
In the system to keep all batteries have the correct battery will extend the use life of expensive batteries. Such as electric cars and other automotive systems and uninterrupted power system emergency, the right to obtain customer satisfaction is extremely important. Using LTC6801 is a cost effective, it may be redundant fault system lithium-ion monitoring of management to improve long term reliability. LTC6801 with a more accurate battery management with the descent, can provide a review function, examination of all components of the system is functioning normally. If malfunctioning, it will provide a marker to start the procedure to solve the problem. This helps increase the reliability of the safety of the final product, never a bad thing to do Sony VGP-BPS9A