Data Sheet TLE 6232 GP

V2.3

Page

2009-11-18

11

- SCON_REG: 8-bit (1 byte) length for serial control of the outputs (serial data bits)

- DIAG_REG: 16-bit (2 byte) length. Contains the diagnostic information (2 bits per chan-

nel), a common over-temperature bit and a common fault bit.

Registers MUX_REG and SCON_REG are writeable as well as readable from the microcon-

troller. The DIAG_REG can only be read from the µC.

This leads to five different control bytes which are recognized by the IC. The following table

shows the different modes.

MSB

LSB

MSB

LSB

WR_SCON

SI:

SO:

H L L H H L X X

D6 D5 D4 D3 D2 D1 X X

DIA4

DIA3

DIA2

DIA1

Write to SCON Register.

RD_SCON

SI:

SO:

H L L H L H X X

X X X X X X X X

SCON6 .. . SCON1 H H

Read SCON Register

WR_MUX

SI:

SO:

H L H L H L X X

M6 M5 M4 M3 M2 M1 X X

DIA4

DIA3

DIA2

DIA1

Write to MUX Register.

RD_MUX

SI:

SO:

H L H L L H X X

X

X

X

X

X

X

X

X

MUX6

. .

MUX1

H H

Read MUX Register

RD_DIAG

SI:

SO

H L L L L L X X

X

X

X

X

X

X

X

X

DIA4

DIA3

DIA2

DIA1

Read DIAG Register

SI Control Byte

SI Data Byte

Note:

’X’ means ’don’t care’, because data will be ignored

’Dx’ represents the serial data bits, either being H (= OFF) or L (= ON)

’Mx’ enables parallel control of channel x H (=parallel) or L (=serial)

’Z’ means tri-state

’F’ is the common fault flag

’OT’ is the common over-temperature flag

’DIAx’ is the 2 bit diagnosis information per channel

All other possible control bytes will lead to an ignorance of the data bits, but the full diagnosis

information (like RD_DIAG command) is provided at the SO line. A reset of all fault registers

(and OT bit) the will only be done if the RD_DIAG command was clocked in.

Characteristics of the SPI Interface

If the slave select signal at CS is High or bit 7 and bit 6 of the instruction byte differ from „1“

and „0“, the state machine is set on default condition, i.e. the state machine expects an in-

struction.

If the 5V-reset (RESET) is active, the SPI output SO is switched into tri-state.

In order to increase the possible number of SPI participants on one and the same CS signal,

bits 7 and 6 of the instruction byte are fixed as shown above. While receiving the first two bits

of the instruction byte the data output SO has to be in tri-state. After having received the first

two bits TLE6232 has to decide if it is addressed (bit 7 = high, bit 6 = low). In this case the

remaining 6 bits of the instruction byte and the data byte are accepted and the diagnostic

feedback respectively the data byte content (MUX, SCON) is sent to the microcontroller. Oth-

erwise instruction and data bits are rejected and SO remains in tri-state.