TC80310 datasheet(14/31 Pages) NXP

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NXP Semiconductors

80310

5.6.2

Wake-up

This state is reached when a transition is detected on the communication interface.

• The logic is out of reset.

• All the blocks are on.

• There is no regulation. DC = 0%

After a LIN timeout, if no valid instruction is decoded, then the device goes back into Stand-by mode.

5.6.3

Pre-exc

The pre-excitation state is reached as soon as a valid instruction for the regulated value (VREG), different from 10.6 V, is decoded. If B+A

is lower than the expected (VREG), then the duty cycle is equal to DCSTART UP, or else DCMIN. The purpose of pre-excitation is to increase

the magnetization of the alternator, to guarantee a minimum phase voltage for the rotor speed measurement when the engine starts. The

pre-excitation stays active until the detection of phase starts regulating RPM (fSTART).

5.6.4

Regulation with LRC

In this mode, the 80310 regulates the alternator output to the set reference level. The excitation is controlled by LRC if this LRC mode is

active until the detection of phase stop This LRC mode is active until the detection of phase stop regulating RPM (fSTOP). In this case, the

device goes back to the pre-excitation mode. If the phase frequency reaches the LRC disable RPM default (fLRC), the device goes into

regulation without LRC.

5.6.5

Regulation without LRC

This mode is active when the phase frequency is above the LRC disable RPM default (fLRC), the first VREG was reached with LRC. The

excitation is controlled only by the internal comparator of B+A and VREG. The DC can not be lower than DCMIN. If the phase frequency

goes below the LRC disable RPM default (fLRC), then the 80310 comes back to the regulation with LRC mode. If the phase frequency

goes below the phase stop regulating RPM, the device goes to pre-excitation mode.

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