80310 datasheet(14/31 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

80310

FUNCTIONAL DEVICE OPERATION

STATE MACHINE

The following diagram describes the state machine of the TC80310:

Standby

No edge on Phase but

Edge on LIN

(High Phase1 appears) or

(100%DC during 8 cycles =>

Phase Regulation set OFF)

POR

LIN Timeout with no Phase

LIN MID3C if nvm_lin_special

Wake-up

on LIN

LIN Command with Vreg <> 10.6V:

MID 29 if nvm_ALT1

MID2A if nvm_ALT2

MID2B if nvm_lin_special

REGULATION w LRC

PRE-EXC

No High Phase1 in the

previous cycle and Phase

Regulation is ON

Phase

REGULATION

REGULATION w/o LRC

No High Phase1 in the

previous cycle and Phase

Regulation is ON

(High Phase 1 appears) or

(100%DC during 8 cycles =>

Phase Regulation set OFF)

Phase > Start

Phase < Stop

Phase > LRC

and first Vreg reached with LRC

Phase < LRC

Phase < Stop

Edge on Phase

Wake-up

on Phase

See cont. in

Self-Start State

Machine

Phase

REGULATION

- LIN = 10.6V with no Phase

- LIN = 10.6V whatever the Phase if

nvm_106V_ref_off

Regulation

Phase

Regulation

Phase

Figure 9. LIN Wake-up State Machine

STANDBY:

The 80310 is in standby mode, if there is a LIN timeout and

in absence of alternator rotation (no phase), or in case of

power and reset (POR), or with a LIN MID3C command if

nvm_lin_special is set

• There is no excitation.

• The duty cycle (DC) is equal to zero.

The device needs a small amount of quiescent current to

feed some functions such as oscillator.

LIN timeout means:

• No activity on the LIN bus during a specified time

• or on a LIN watchdog timeout during a specified time

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.

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).

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

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