15

ATA6830

4575C–BCD–05/03

Travel operation is suspended when overtemperature is detected. An error signal is sent

to the bus master via the bus. Operation can only restart after the supply voltage is shut

off.

•

Interruption of a stepping motor winding

The motor windings are only checked for interruption when supplied with hold current,

not during drive operation. The corresponding output is shut off. The other coil winding

is supplied with hold current. An error signal is sent. Operation can only restart after the

supply voltage is shut off.

•

Short circuit of a stepping motor winding

The corresponding output is shut off. The other coil winding is supplied with hold cur-

rent. An error signal is sent. Operation can only restart after the supply voltage is shut

off.

•

Short circuit of an output to ground or V

BAT

The corresponding output is shut off. The other coil winding is supplied with hold cur-

rent. An error signal is sent. Operation can only restart after the supply voltage is shut

off.

An error signal is sent to the microcontroller by clamping the bus to ground for 3 sec-

onds. If the error should occur during a data transmission, the above described

reactions will happen immediately except for the clamping. This will take place about

200 µs after the end of the stopbit of the lowbyte to guarantee a correct command rec-

ognintion in the second headlamp. The error signal timing is shown in Figure 15.

Figure 15. Error Signal Timing

ERROR RESPONSE

MESSAGE FRAME

3 s

ca. 9.2 ms

Buslevel

1

0

Absolute Maximum Ratings

Parameters

Symbol

Value

Unit

Power supply (t < 400 ms)

V

BAT

-0.3 to +45

V

DC power supply

V

BAT

-0.3 to +28

V

DC output current

I

OUT

±1.1

A

BUS input voltage

V

BUS

-0.3 to V

V

Human body model

ESD

2

kV

Charged device model

ESD

500

V

Storage temperature

T

Stg

-55 to +150

°C

Operating temperature

T

op

-40 to +105

°C

Maximum junction temperature

T

jmax

+150

°C