Data Sheet TLE 7230 R

V2.0

Page

2005-10-05

9

SI - Serial Input. Serial data bits are shifted in at this pin, the most significant bit (MSB) first. SI informa-

tion is read in on the falling edge. Input data is latched in the SPI shift register and then transferred to the

internal registers of the logic.

The input data consist of 16 bit, made up of x control bits and y data bits. The control bits are used ad-

dress the desired SPI register and the data bits are used to program in user-specified settings.

SO - Serial Output. Diagnostic data bits are shifted out serially at this pin, the most significant bit (MSB)

first. SO is in a high impedance state until the CS pin goes to a logic low state. New diagnostic data will

appear at the SO pin following the rising edge.

SPI Control and Commands:

MSB

14

13

12

11

10

9

8

7

6

5

4

3

2

1

LSB

SI:

CMD

x

x

x

ADDR

DATA

SO standard diagnosis

SO:

Ch 8

Ch 7

Ch 6

Ch 5

Ch 4

Ch 3

Ch 2

Ch 1

SO after read command in previous frame

SO:

0

1

0

0

0

ADDR

DATA

CMD

Command:

0 0 : Diagnosis Only :

Reads out the diagnosis register. This command has no other influence on the device.

0 1 : Read register :

With the next SO data frame the content of the addressed register will be sent.

1 0 : Reset Registers:

Resets back all internal registers. Logic registers to default and Fault registers to no er-

ror.

1 1 : Write register :

The data of the SI word will be written to the addressed register.

No valid Commands:

If the first 8 bit of the SI word contains an invalid command, it will not result in any reac-

tion by the TLE 7230 R (register value change, switching channels, ...). Additionally an

L

àH of Chip Select (CS) will not reset the diagnosis register.

ADDR

Address:

Pointer to register for read and write command

DATA

Data:

Data written to or read from register selected by address ADDR

Ch x

Standard diagnosis for channel x:

For details see "SPI Diagnostics"