8

NXP Semiconductors

80310

5

Functional description

5.1

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.

5.2

Functional pin description

5.2.1

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.

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).

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