L6460 datasheet(39/139 Pages) STMICROELECTRONICS

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L6460

Start-up configurations

Doc ID 17713 Rev 1

39/139

Start-up configurations

L6460 start-up configuration is selected by setting in different states the GPIO[0], GPIO[3]

and GPIO[4] pins. Each of these is a three state input pin and is able to distinguish among

the following situations:

Note:

“Shorted” means: R

≤1KOhm; “Z” means: R≥10KOhm, C≤200pF

8.1

Operation modes

When VSupply voltage is applied to L6460, the internal regulator V3v3, used to supply the

logic circuits inside the device, starts its functionality. When it reaches its final value, L6460

enables the GPIO[0] pin state read circuitry, and, after a time TpinSample, it will sample the

GPIO[0] state. If it is found to be in high impedance, L6460 does not consider GPIO[3] and

GPIO[4] pins state and starts its “Basic device” mode sequence. If GPIO[0] is found to be

connected to ground or to V3v3, L6460 checks the state of GPIO[3] and GPIO[4] pins to

select its start-up configuration.

The possible configurations can be classified in four “Major” modes:

Basic device.

Slave device.

Master device.

Single device.

Hereafter is reported the correspondence table between GPIO[X] state and L6460

configurations.

Table 8.

Possible start-up pins state symbol

Pin condition

State symbol

Shorted to ground

Shorted to V3v3 pin

Floating

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