80310 Datasheet, PDF (14/31 Pages) Freescale Semiconductor, Inc – Alternator Regulator with LIN High side field driver

FUNCTIONAL DEVICE OPERATION
STATE MACHINE
STATE MACHINE
The following diagram describes the state machine of the TC80310:
Edge on Phase
Wake-up
on Phase
See cont. in
Self-Start State
Machine
Standby
No edge on Phase but
Edge on LIN
- POR
- LIN Timeout with no Phase
- LIN MID3C if nvm_lin_special
W ake-up
on LIN
- LIN = 10.6V with no Phase
- LIN = 10.6V whatever the Phase if
nvm_106V_ref_off
LIN Command with Vreg <> 10.6V:
- MID 29 if nvm_ALT1
- MID2A if nvm_ALT2
- MID2B if nvm_lin_special
PRE-EXC
Phase < Stop
Phase < Stop
Phase > Start
REGULATION w LRC
No High Phase1 in the
previous cycle and Phase
Regulation is ON
Pha^Pse^hase
R^RE^eG^gU^ulL^aA^tioTⁿION
Phase < LRC
Phase > LRC
and first Vreg reached with LRC
(High Phase1 appears) or
(100%DC during 8 cycles =>
Phase Regulation set OFF)
REGULATION w/o LRC
No High Phase1 in the
previous cycle and Phase
Regulation is ON
Phas^Pe^hase
RE^RG^eU^guL^laA^tiT^onION
(High Phase 1 appears) or
(100%DC during 8 cycles =>
Phase Regulation set OFF)
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 (V_REG), different from
10.6 V, is decoded.
If B+A is lower than the expected (V_REG), then the duty
cycle is equal to DC_{START UP}, or else DC_MIN.
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 (f_START).
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
80310
14
Analog Integrated Circuit Device Data
Freescale Semiconductor