L9963E datasheet(16/184 Pages) STMICROELECTRONICS

16 / 184 page

4.1.2.1

Operations in Init state

Here below a list of operations the device can perform during Init State.

Table 8. Operations in Init state

Operation

Timing mode

Functions involved

Communication

Always ON

SPI/isolated SPI Logic and storage

Init Timeout

Always ON

t_SHUT timer

4.1.2.2

Addressing procedure

The following algorithm describes the correct daisy-chain addressing procedure for a stack of NDEVICES:

Figure 7. Daisy chain addressing algorithm

Set X = 1

Send

BROADCAST

command

with

out_res_tx_is

o = XX,

iso_freq_sel =

Send WRITE

command

with

chip_ID =

NDEVICES with

Farthest_Un

it = 1 (if not

in dual ring

system, set

also

isotx_en_h

= 0)

Send

BROADCAST

command

with

Lock_isoh_iso

freq = 1 to

lock the ISOH

port and ISO

frequency

configuration

Switching to high frequency (iso_freq_sel = 11) before initialization procedure has been completed is not

recommended, since it might prevent other units from being initialized.

Once initialization procedure is done, it is possible to lock ISOH port status and ISO frequency configuration by

setting Lock_isoh_isofreq = 1: the lock adds more safety against unwanted write access to iso_freq_sel and

isotx_en_h bit in DEV_GEN_CFG register.

4.1.3

Normal state

All references are powered, and the ADCs and interfaces are ready for measurement and data transmission

respectively. The commands sent by the micro-controller can be read from both ISO lines and SPI pins.

On receiving a valid command, the L9963E executes the corresponding operations, such as voltage, current and

over-temperature measurement.

Some core safety operations (e.g. OV, UV, OT, UV, and VBAT monitoring) are checked in the background

automatically.

In case the communication with MCU is missing for t > t_SLEEP (programmable via CommTimeout, maskable

via comm_timeout_dis) or a GO2SLP command is received, the device moves either to Sleep state or to Silent

Balancing state, depending on slp_bal_conf bit and balancing state.

L9963E

Device functional state

DS13636 - Rev 12

page 16/184

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