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參數(shù)資料
| 型號： | M61047FP |
| 廠商： | Renesas Technology Corp. |
| 英文描述： | Battery Protection Analog Front End (AFE) IC |
| 中文描述： | 電池保護模擬前端（AFE）芯片 |
| 文件頁數(shù)： | 9/24頁 |
| 文件大?。?/td> | 305K |
| 代理商： | M61047FP |
M61047FP
Rev.2.00 Mar 04, 2005 page 9 of 23
Operation Description
M61047FP is developed for intelligent Li-ion battery pack such as SB in SBS. M61047FP is suitable for Smart Battery.
Pair using with Microcomputer such as M37517 and small additional parts will give various functions such as battery
remaining capacity detection. All functions are described as follows.
Note: SBS: Smart Battery System introduced by Intel and Duracell
SB: Smart Battery, which contains 3 or 4 series Li-ion battery cells.
Voltage Detection Circuit of Each Li-ion Battery Cell
M61047FP can output each battery cell's voltage of 3 or 4 series connection. Built-in buffer amplifier is monitoring
each battery voltage.
Series Regulator
M61047FP contains low drop out series regulator. Microcomputer in SB does not need any additional voltage regulator.
Usually, although series regulator is 3.3 V output, it is possible to change to 5 V output by register setup at the time of
flash memory rewriting of microcomputer.
Reset Circuit
Vreg output voltage is checked by Reset circuit of M61047FP. 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.
Conditioning Circuit
M61047FP have a discharge circuit of each cells. It is available for drop of cell voltage for safety purpose. And to
shorten the difference voltage among the cells. It can extend the battery pack life.
Power Save Function
M61047FP contains power save function to control several supply current. It can operate in the three state, usual mode,
power save mode, and power down mode. These three modes can be changed by the command from a microcomputer,
and can control the consumption current in each mode.
1. Usual mode
It is in the state where all circuits are operating.
2. Power save mode
In power save mode, consumption current is reduced by stopping voltage detection circuit, and outputting ALALOG
output with GND level. If ANALOG output is changed to the battery voltage output or offset voltage output of each
cell by the command from a microcomputer, it will change to usual mode. In addition, the regulator circuit is
operating in a power save mode.
3. Power down mode
In power down mode, all circuits will be stopped.
The shift to power down mode and operation at the time of resume from power down mode are explained below using
Figure 2.
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