參數(shù)資料
型號(hào)： M61040FP
廠商： Mitsubishi Electric Corporation
英文描述： Smart battery protection and monitoring IC
中文描述： 智能電池保護(hù)和監(jiān)測(cè)集成電路
文件頁(yè)數(shù)： 3/25頁(yè)
文件大?。?/td> 181K
代理商： M61040FP
Smart battery protection and monitoring IC
M61040FP
Mitsubishi Electric
(3/25)
2. Operation description
M61040 is developed for intelligent Li-ion battery pack such as SB in SBS. M61040 is suitable for Smart
Battery.
*SBS: Smart Battery System introduced by Intel and Duracell
*SB: Smart Battery which contains 3 or 4 series Li-ion battery cells.
All analog circuits are included to M61040. Therefore pair using with Microcomputer such as M37515
and small additional parts will give various functions such as battery remaining capacity detection. All
functions are described as follows:
1)Voltage Detection circuit of each Li-ion battery cells
M61040 can output each battery cell’s voltage of 3 or 4 series connection. Built-in buffer amplifier is
monitoring each battery voltage. Microcomputer can adjust the offset voltage.
2)Charge / discharge current detection circuit
In SBS, remaining capacity check function (Gas-gage function ) is necessary. To calculate accurate
remaining capacity, microcomputer must get charge / discharge current periodically. Accurate charge /
discharge current of external sense register is monitored by built-in amp. The charger/ discharge
current is converted to Voltage value through the accurate sense resistor.
Output gain can be controlled by Microcomputer. Off-set voltage can be set lower by external parts,
therefore dynamic range of Microcomputer’s A to D converter will widen.
3) Over current detection circuit
M61040 contains over current detection circuit. The discharging FET is turned off to stop discharging
and it continues for the over current detection delay time (tIOV1) or longer, if the discharging current
becomes equal to or higher than a specified value. It is necessary for safety of Li-ion battery pack.
Delay time is set by external capacity connected to CIN. Also the voltage of CIN shows detection or
NOT detection of over current. Over current detection is controlled independently by this M61040’s
built-in hardware NOT by Microcomputer’s software control.
4) Series regulator, reference voltage
M61040 contains Low drop out series regulator. Microcomputer in SB does not need any additional
voltage regulator, MAX 20mA/5V. Also M61040 gives very accurate reference voltage as 4.85V for Vref
voltage for Microcomputer’s A to D converter.
5) Reset circuit for Microcomputer
Vreg output voltage is checked by Reset circuit of M61040. Therefore, lower voltage of Vreg issues
RESET signal to stop mull-function of Microcomputer. Also, lower voltage after long time’s left issues
RESET signal to stop mull-function of Microcomputer. This function is useful for safety of long time’s
left battery.
When charger is connected to SB, this circuit will check Vreg voltage, so if Vreg voltage is NOT
enough high, this circuit remains Low as for RESET signal to Microcomputer.
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