AS8506 datasheet(31/89 Pages) AMSCO

31 / 89 page

ams Datasheet, Confidential:2013-Sep [1-00]

AS8506 – 31

Detaile d Desc rip t ion

enters into SLEEP mode. In the WAIT period all power blocks are

ON, all analog blocks are ON and digital is also functional. In

this mode, power consumption is lesser than NORMAL mode

because there are no charge balancing activities being carried

out.

Wake Mode

This is also a transition mode, where the device does

initialization after exiting SLEEP mode. In the SLEEP mode if

AS8506 receives a wake pulse of width TWAKE, the device enters

into WAKE mode. In the WAKE mode device enables the V5V LDO

and waits for V5V_por_n signal. Once V5V_por_n signal

becomes ‘High’, the device enters into WAIT mode.

An example of Compare and Balance (active balance) phase

sequence with respect to time is given in Figure 25. In this

example it is assumed that only 6 cells are connected to AS8506

and comparators’ outputs at Diagnosis phase is “010010X”;

Where:

‘0’ indicates respective cell voltage is less than target voltage

and needs charging.

‘1’ indicates respective cell voltage is more than target voltage

and needs charging.

‘X’ indicates no cell is connected to respective comparator and

output is neglected.

Figure 25:

Diagnosis and Balance Phase with Time Sequence for AS8506

Balance Phase

Compare Phase

PWM

Charging

Cell

Connected

Vcell1 < Vrdiv

Need

Charging

Idle

Time

Idle

Time

Idle

Time

Cell

Connected

Vcell2 > Vrdiv

Don’t Need

Charging

Cell

Connected

Vcell3 < Vrdiv

Need

Charging

Cell

Connected

Vcell4 < Vrdiv

Need

Charging

Cell

Connected

Vcell6 < Vrdiv

Need

Charging

Cell

Connected

Vcell5 > Vrdiv

Don’t Need

Charging

Cell

Not

Connected

Tc_slot

AS8506 Datasheet(PDF) 31 Page - ams AG

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