Data Sheet TLE 6240 GP

V3.1

Page

26.Aug 2002

14

Control words beside No. 1- 10

Not specified Control words are not executed (cause no function) and the shift register (SO

Example for an access to channel 1 to 8:

LLHH LLLL HLLH LLLH: OR operation between parallel inputs and data bits, i.e channel 1, 5

and 8 will be switched on.

The next command is now: LHHH LLLL HHHH LLLL

LHHH LLLL as command word has no special meaning and will not be accepted. The output

Diagnostics

FAULT

- Fault pin. There is a general fault pin (open drain) which shows a high to low transi-

tion as soon as an error occurs for any one of the sixteen channels. This fault indication can

be used to generate a µC interrupt. Therefore a ‘diagnosis’ interrupt routine need only be

called after this fault indication. This saves processor time compared to a cyclic reading of the

SO information.

As soon as a fault occurs, the fault information is latched into the diagnosis register. A new

error will over-write the old error report. Serial data out pin (SO) is in a high impedance state

For full diagnosis there are two diagnostic bits per channel configured as shown in Figure 1.

Normal function: The bit combination HH indicates that there is no fault condition, i.e. normal

function.

Overload, Short Circuit to Battery (SCB) or Overtemperature: HL is set when the current

limitation gets active, i.e. there is a overload, short to supply or overtemperature condition.

Open load: An open load condition is detected when the drain voltage decreases below 3 V

(typ.). LH bit combination is set.

Diagnostic Serial Data OUT SO

HH

Normal function

HL

Overload, Shorted Load or Overtemperature

LH

Open Load

LL

Shorted to Ground

Ch.8

Ch.7

Ch.6

Ch.5

15

14

13

12

11 10

9

8

7

6- - - - -

Ch.16 Ch.15

Ch.14

Ch.13

Figure 1: Two bits per channel diagnostic feedback