L6480 datasheet(30/73 Pages) STMICROELECTRONICS

30 / 73 page

Functional description

L6480

30/73

Doc ID 023278 Rev 3

6.13

Reset and standby

The device can be reset and put into Standby mode through the STBY/RESET pin. When it

is forced low, all the gates are turned off (High Z state), the charge pump is stopped, the SPI

interface and control logic are disabled and the internal VREG voltage regulator maximum

output current is limited; as a result, the L6480 heavily reduces the power consumption. At

the same time the register values are reset to their default and all the protection functions

are disabled. The STBY/RESET input must be forced low at least for tSTBY,min in order to

ensure the complete switch to Standby mode.

On exiting Standby mode, as well as for IC power-up, a delay must be given before applying

a new command to allow proper oscillator and charge pump startup. Actual delay could vary

according to the values of the charge pump external components.

On exiting Standby mode all the gates are off and the HiZ flag is high.

The registers can be reset to the default values without putting the device into Standby

mode through the ResetDevice command (Section 9.2.14).

6.14

External switch (SW pin)

The SW input is internally pulled up to VDD and detects if the pin is open or connected to

ground (see Figure 13).

The SW_F bit of the STATUS register indicates if the switch is open (‘0’) or closed (‘1’)

(Section 9.1.24); the bit value is refreshed at every system clock cycle (125 ns). The

SW_EVN flag of the STATUS register is raised when a switch turn-on event (SW input falling

edge) is detected (Section 9.1.24). A GetStatus command releases the SW_EVN flag

(Section 9.2.20).

By default, a switch turn-on event causes a HardStop interrupt (SW_MODE bit of CONFIG

Table 10.

Thermal protection summarizing table

State

Set condition

Release condition

Description

TH_STATUS

Normal

Normal operation state

Warning

Tj > Tj(WRN)Set

Tj > Tj(WRN)Rel

Temperature warning: operation is

not limited

Bridge shutdown

Tj > Tj(OFF)Set

Tj > Tj(OFF)Rel

High temperature protection: the

gates are turned off and the gate

drivers are disabled

Device shutdown

Tj > Tj(SD)Set

Tj > Tj(SD)Rel

Overtemperature protection: the

gates are turned off, the gate

drivers are disabled, the internal

VCC voltage regulator is disabled,

the current capability of the

internal VREG voltage regulator is

limited, and the charge pump is

disabled

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