80310_12 Datasheet, PDF (9/31 Pages) Freescale Semiconductor, Inc – Alternator Regulator with LIN

FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 80310 is an integrated circuit intended to regulate the
output voltage of an automotive alternator.
The IC supplies a current via a high side MOSFET to the
excitation coil of the alternator and provides an internal
freewheeling diode. It keeps the battery at its nominal charge
and delivers current to electrical devices within the vehicle.
The 80310 also provides a load response control
mechanism (LRC), and has an interface for the industry
standard LIN protocol (v1.3) to allow an ECU (master) to
control the regulated voltage and the LRC rate among other
parameters.
The ECU also can read back information about the status
of the regulator and the alternator via LIN.
The programmable parameters by the ECU:
• Regulated voltage
• LRC ramp time, LRC cut off
• Excitation current limitation
The information sent back to the ECU:
• Die temperature
• Excitation current
• EXC duty cycle (DF)
• Manufacturer and class
• Faults:
•Electrical, mechanical, temperature
•LIN time out
•LIN communication error: watchdog, check sum, Id
parity, sync break
The IC can be programmed as an OTP device (One Time
Programmable) to fit a large number of alternators and
applications. These programmable parameters are described
in the functional device operation (Table 6). This circuit is
specially designed to operate in harsh automotive
environment.
FUNCTIONAL PIN DESCRIPTION
PHASE (PH1 AND PH2)
These pins connect to stator windings. These signals are
used for the rotor speed measurement, stator voltage
measurement as well as the self start detection.
LIN BUS (BUS)
This LIN pin represents the single-wire bus transmitter and
receiver. It is suited for automotive bus systems and is based
on the LIN bus specification v1.3.
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Figure 6. Internal Signals in Normal Mode
In this situation the regulator stays in Normal mode. (P1
and P2 represent internal signals coming from the phase
processor block, which are routed to the logic block).
GROUND PINS (PGND, SGND)
The 80310 has two different types of ground pins. The
PGND pin is the power ground pin for the device. The SGND
is the signal ground pin.
Important: The PGND, the SGND pins must be connected
together to a ground external to the device.
SUPPLY VOLTAGE (B+A)
The 80310 is supplied by this B+A pin. This voltage is also
used as the feedback voltage by the control circuit.
EXCITATION (EXC)
This pin is connected to the excitation coil (rotor) of the
alternator. The IC supplies a current via a high side MOSFET
to the excitation winding to create a magnetic filed in the
rotor. This generates sinusoidal currents in the stator which
are rectified by a diode bridge.
Analog Integrated Circuit Device Data
Freescale Semiconductor
80310
9