AS8506 datasheet(29/89 Pages) AMSCO

29 / 89 page

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

AS8506 – 29

Detaile d Desc rip t ion

Operating Modes

The AS8506 has two main operating modes NORMAL and SLEEP,

and has two transition modes WAIT and WAKE. The transition

modes are intermediate modes for switching from SLEEP to

NORMAL and vice versa. The detailed operation of each mode

is explained in subsequent sections. The initialization phase is

explained in“Initialization Sequence” on page 36.

NORMAL Mode

The device enters into NORMAL from WAKE when it receives a

short or long trigger. The NORMAL mode is a full functional

mode, where all the power supply and analog blocks are in

ON-state and the digital is fully functional.

The NORMAL mode has two phases of operation:

• Diagnosis phase

• Balance phase

Diagnosis Phase

In Diagnosis phase AS8506 detects the number of cells

connected to the device. The connected cell voltages are then

compared with upper & lower thresholds and target cell voltage

of all cells connected. Upper and lower cell voltage thresholds

as well as target cell voltages are provided from external in

analog or digital format. The Diagnosis phase sequence of

operation is explained below.

• Detects number of cells connected to the device by

comparing each cell terminals to cell detect threshold

voltage.

• Simultaneously compares each connected cell voltage

with set lower operating voltage threshold Vlimit_L. If any

of the cell voltages is less than the set lower operating

threshold, then an indication is given on CVT_NOK_OUT

pin stating that one/more cell voltages are not within the

operating voltage threshold range. Each cell status is

stored in cel_low_thsld_stat_reg register.

• Simultaneously compares each connected cell voltage

with set higher operating voltage threshold Vlimit_H. If

any of the cell voltages is greater than the set higher

operating threshold, then an indication is given on

CVT_NOK_OUT pin stating that one/more cell voltages

are not within the operating voltage threshold range. Each

cell status is stored in cel_high_thsld_stat_reg register.

• Simultaneously compares each connected cell voltage

with reference value. This result is stored in

cel_ref_stat_reg register and used in balance phase. Cell

reference can be provided by microcontroller by writing

into register or by providing input at external pin

VREF_IN.

• Enables the SAR ADC and measures each cell voltage and

two temperature inputs sequentially. The 12 bits cell

voltage and temperature inputs information is stored in

respective registers.

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