Data Sheet TLE 6220 GP

V2.1

Page

2007-05-03

8

Serial Control of the Outputs: SPI protocol

Each output is independently controlled by an output latch and a common reset line, which dis-

ables all four outputs. The Serial Input (SI) is read on the falling edge of the serial clock. A logic

high input 'data bit' turns the respective output channel ON, a logic low 'data bit' turns it OFF.

transfers the serial data input bits to the output control buffer.

As mentioned above, the serial input byte consists of a 4 bit control word and a 4 bit data word.

Via the control word, the specific mode of the device is programmable.

MSB

LSB

3

2

1

3

2

1

Bits

Data

Bits

Control

DDDD

CCCC

: Serial input byte

Five specific control words are recognised, having the following functions:

No.

Serial Input Byte

Function

1

LLLL XXXX

Only 'Full Diagnosis' performed. No change to output states.

2

HHLL XXXX

State of four parallel inputs and '1-bit Diagnosis' outputted.

3

HLHL XXXX

Echo-function of SPI; SI direct connected to SO

4

LLHH DDDD

IN1...4 and serial data bits 'OR'ed. 'Full Diagnosis' performed.

5

HHHH DDDD

IN1...4 and serial data bits 'AND'ed. 'Full Diagnosis' performed.

Note: 'X' means 'don't care', because this bit will be ignored

'D' represents the data bit, either being H (=ON) or L (=OFF)

1. 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 11). 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 com-

mand is again "Diagnosis only".

2. HHLL XXXX

-

Reading back of input, and ‘1-bit Diagnosis’

If the TLE 6220 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 four bits of the SO give the state of the parallel inputs, depending on the µC sig-

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

nection between the µC and the TLE 6220 can be verified - i.e. ‘read back of the inputs’.

The second 4-bit word fed out at the serial output contains ‘1-bit’ fault information of the out-

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

bit for channel X.

MSB

LSB

IN4 IN3 IN2 IN1 F4 F3 F2 F1

: Serial Output byte