AS8506 datasheet(33/89 Pages) AMSCO

33 / 89 page

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

AS8506 – 33

Detaile d Desc rip t ion

Trigger Event

The AS8506 device enters into NORMAL mode only when a valid

command is present on the TRIG_IN pin. There are two

commands in the device.

• Diagnosis command

• Cell balance command

When a high pulse of width Tdiag_cmd as shown in Figure 27, is

given on TRIG_IN pin, the device performs the following

operations.

• Compares all connected cell voltages with the set lower

operating voltage threshold, and if any of the cell voltage

is less than lower threshold, then sets a corresponding flag

in the cel_low_thsld_stat_reg register. This is indicated by

high pulse on CVT_NOK_OUT pin.

• Compares all connected cell voltages with the set higher

operating voltage threshold, and if any of the cell voltage

is more than higher threshold, then sets a corresponding

flag in the cel_high_thsld_stat_reg register. This is

indicated by high pulse on CVT_NOK_OUT pin.

• Sets a corresponding flag in the temp_stat_reg register if

ambient temperature or internal chip temperature is

higher than respective thresholds. This is indicated by

high pulse on CVT_NOK_OUT pin.

• It will enable SAR ADC and starts measuring each cell

voltage, and then measures temperature channel

measurement. The 12 bits digital value will be stored in

corresponding registers.

Thus, on diagnosis command the device gives the cell operating

voltage, ambient temperature and internal temperature status

with respect to its safe operating range.

When the TRIG_IN pin is ‘High’ for longer than the status

command, the device enters into Balance phase. Depending

upon cell voltage status, the device starts balancing the cell

voltages. The cell voltage balancing is continued till the high

voltage on the TRIG_IN pin. As soon as TRIG_IN goes ‘Low’, the

device stops balancing and enters into WAIT mode. Thus, the

microcontroller has full control over the balancing time and

stop balancing whenever required.

AS8506 Datasheet(PDF) 33 Page - ams AG