L9929

14/23

5.6

Reset of the Diagnostic Register DIA_REG

On the following conditions DIA_REG is reset:

– With the rising edge of the SS-signal after the SPI-Instruction RD_DIA (only if error free while SS,

new errors will actualize DIA_REG with the rising edge of SS).

– When the voltage on DMS exceeds the threshold for detecting SPI-Mode. (after undervoltage condi-

tion or after power up)

– - If VS rises over about the undervoltage level, the Bits of DIA_REG are restored (when VS internal

or DMS > 3,1V)

Verification byte:

5.7

Diagnostics/Encoding of Failures

Description of the SPI Registers

(SPI Instructions: RD_DIA)

MSB

765432

10

Z

Z

1010

1

TRANS_F

Bit

Name

Description

0

TRANS_F

Bit = 1: error detected during previous transfer

Bit = 0: previous transfer was recognised as valid

1

Fixed to High

2

Fixed to Low

3

Fixed to High

4

Fixed to Low

5

Fixed to High

6

Send as high impedance

7

Send as high impedance

Register:

DIA_REG

765432

10

Active

OT

CurrRed

CurrLim

DIA21

DIA20

Dia11

DIA10

State of Reset: FFH

Access by Controller:

Read only

Bit

Name

Description

0

DIA 10

Diagnosis-Bit1 of OUT1

1

DIA 11

Diagnosis-Bit2 of OUT1

2

DIA 20

Diagnosis-Bit1 of OUT2

3

DIA 21

Diagnosis-Bit2 of OUT2

4

CurrLim

Is set to „0“ in case of current limitation

5

CurrRed

Is set to „0“ in case of temperature dependet current limitation

6

OT

Is set to „0“ in case of overtemperature

7

Active

Shows the wired-or state of the Pins EN and DI