L6470PD datasheet(30/70 Pages) STMICROELECTRONICS

30 / 70 page

Functional description

L6470

30/70

Doc ID16737 Rev 5

6.12

Reset and standby

The device can be reset and put into Standby mode through a dedicated pin. When the

STBY\RST pin is driven low, the bridges are left open (High Z state), the internal charge

pump is stopped, the SPI interface and control logic are disabled and the internal 3 V

voltage regulator maximum output current is reduced to IREG,STBY; as a result, the L6470

heavily reduces the power consumption. At the same time the register values are reset to

default and all protection functions are disabled. STBY\RST 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 of up to tlogicwu must be given

before applying a new command to allow proper oscillator and logic startup and a delay of

up to tcpwu must be given to allow the charge pump startup.

On exiting Standby mode, the bridges are disabled (HiZ flag high) and any motion command

makes the device exit High Z state (HardStop and SoftStop included).

Attention:

It is not recommended to reset the device when outputs are

active. The device should be switched to high impedance

state before being reset.

6.13

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’) (see

Section 9.1.22); 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 (see Section 9.1.22). A GetStatus command releases the SW_EVN flag

(see Section 9.2.20).

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

events do not cause interrupts and the switch status information is at the user’s disposal

(see Table 34, Section 9.1.22).

The switch input may be used by the GoUntil and ReleaseSW commands as described in

Section 9.2.10 and 9.2.11.

If the SW input is not used, it should be connected to VDD.

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