80310 datasheet(26/31 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

80310

FUNCTIONAL DEVICE OPERATION

PROTECTION AND DIAGNOSIS FEATURES

FAULT DETECTION

General Notes

All fault reporting passes through a 400 ms digital filter to

avoid false indication problems, and transition from one fault

type to another should be “clean”.

MECHANICAL FAULT (F_MEC)

The Phase is off (Low Phase RPM below stop_regulation

threshold). Reported in Alternator A/B read data field (ID=11,

13), byte 1.

ELECTRICAL FAULT (F_EL)

If one of these faults appear:

• The number of “1”s in all the OTP bits, NVM[80:1] is not

ODD. The parity bit is included in the calculation

• The Phase is on (Low Phase RPM above

stop_regulation threshold) but High Phase 1 is not

detected

• B+A reaches 16.5 V with EXC at 100% DC

• Short circuit excitation load

• B+A stays at 75% of the target voltage when LRC is off

Note: This 5th additional condition is enabled only when

the NVM bit “Low Voltage Threshold” is enabled. Reported in

Alternator A/B read data field (ID=11, 13), byte 1.

ELECTRICAL FAULT (HP MASK)

A fault detection when High phase signal is cut is reported

on the electrical fault.

Option (OTP) available to remove this fault detection.

THERMAL FAULT (F_HT)

A thermal fault is reported when the die temperature

exceeds the programmed threshold. Reported in Alternator

A/B read data field (ID=11, 13), byte 1.

The programmed threshold in hexadecimal corresponds

to the following temperature in degrees:

• 6'b110010;//135degres

• 6'b110100;//145degres

• 6'b110110;//150degres

• 6'b111001;//160degres

ADDITIONAL ERRORS

LIN Bus Timeout

Check two timeouts:

• Activity on RXD is below 3 or 8 seconds (depending on

the OTP bit)

• Time between two consecutive valid messages is below

3 or 8 seconds (depending on the OTP bit)

This flag is reset once the microcontroller sends MID 11 for

ALTA, or MID 13 for Alt B. Reported in Alternator A/B read

data field (ID=11, 13), byte 2.

Comm Error

Checks the ID parity bits + Checksum byte + (TXD = RXD

when responding) + LIN Physical layout not in over-current

limitation. Reported in Alternator A/B read data field (ID=11,

13), byte 2.

LIN protocol errors:

• Sync Break Error: This flag is up when Synchro break

Field duration is lower than 10Tbits.

• Identifier parity Error: Comm error flag also reported in

MID11

• Checksum Error: Comm error flag also reported in

MID11

• Slave not responding Error: Tframe Max exceeded (LIN

Specification revision 1.3).

These flags are reset once the microcontroller sends MID

12 for ALTA, or MID 14 for Alt B. Reported in Alternator A/B

read data field (ID=12, 14), byte 2.

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