Data Sheet TLE 6240 GP

V3.1

Page

26.Aug 2002

11

In the following section the different control bytes will be descriped. X used within the control

byte means:

X = L: Command is valid for channels 1 to 8

X = H: Command is valid for channels 9 to 16

1/6. LLLL XXXX - Diagnosis only

By clocking in this control byte, it is possible to get pure diagnostic information (two bits per

channel) in accordance with Figure 1 (page 14). The data bits are ignored, so that the state of

the outputs are not influenced. This command is only active once unless the next control

command is again "Diagnosis only".

Diagnostic information can be read out at any time with

no change of the switching conditions.

Example for two consecutive chip select cycles:

SI

LLLL

LLLL

XXXX

XXXX

SO

HHHH

HHHH

HHHH

HHHH

CS

SI command: Diagnosis only for channels 1 to 8. No change of

the output states

SO diagnosis: No fault, normal function of channels 1 to 8 or 9 to

16 depending on previous SI command

SI

LLLL

HHHH

XXXX

X XXX

SO

CS

SI command: Diagnosis only for channels 9 to 16. No change of

the output states

DIAG_2 provided during next chip select cycle

SO diagnosis: 2 bit diagnosis performed for channels 1 to 8

DIAG_1

2/7. HHLL XXXX - Reading back of the eight inputs and ‘1-bit Diagnosis’ provided

If the TLE 6240 GP is used as bare die in a hybrid application, it is necessary to know if proper

connections exist between the µC-port and parallel inputs. By entering ‘HHLL’ as the control

word, the first eight bits of the SO give the state of the parallel inputs, depending on the µC

signals. By comparing the IN-bits with the corresponding µC-port signal, the necessary con-

nection between the µC and the TLE 6240 GP can be verified - i.e. ‘read back of the inputs’.

The second 8-bits fed out at the serial output contains ‘1-bit’ fault information of the outputs (H

= no fault, L = fault ). In the expression given below for the output byte, ‘FX’ is the fault bit for

channel X.

MSB

LSB

IN12 IN11 IN10 IN9 IN4 IN3 IN2 IN1

Parallel Input Signals

""""""""

"!

""""""""" FX FX FX FX FX FX FX FX

Fault Bits Channels 1 to 8 or 9 to 16

"""""""!