L9963E datasheet(14/184 Pages) STMICROELECTRONICS

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Functional description

In the following paragraphs, the functionalities of the device are listed and described in detail.

4.1

Device functional state

Figure 6. Device functional states

4.1.1

Reset and Sleep states

Reset state: when stand-by logic is reset, all registers on device are reset. The battery voltage is still under

threshold.

From here, as soon as the POR_STBY goes high the Stby Logic gets its supply power and the Sleep state is

reached.

4.1.1.1

Operations in Reset state

No operation is possible in Reset state

Sleep state:

This state is reached:

•

coming from Reset state on POR_STBY rising

•

from other states in case a Go2SLP cmd is sent by uP or no communication is received for t > t_SLEEP

•

from Init State in case the device address is still 0b0000 after t > t_SHUT

•

from Cyclic_Wup state once the Cyclic Wup job is done and a silent balancing is not to be resumed.

In this state the device is sensitive to External Sources in order to wake up the Main Logic. External sources are:

ISO lines, Fault line, SPI_CS (SPI_CLK) pins, also a GPIO pin for “Master” units.

In this state a slow oscillator is working allowing the device to wake itself up every t = tCYCLIC_SLEEP +

tCYCLIC_WUP and move to Cyclic Wup state.

L9963E

Functional description

DS13636 - Rev 12

page 14/184

L9963E 数据表(PDF) 14 Page - STMicroelectronics