Data Sheet TLE 6220 GP

V2.2

Page

2009-11-18

8

Serial Control of the Outputs: SPI protocol

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

disables 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.

CS must be low whilst shifting all the serial data into the device. A low-to-high transition

of

CS 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 signals. By comparing the four IN-bits with the corresponding µC-port signal, the neces-

sary connection between the µC and the TLE 6220 can be verified - i.e. ‘read back of the in-

puts’.

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