TLE6240GP

Smart 16-Channel Low-Side Switch

Control of the Device

Data Sheet

28

Rev.3.3, 2010-02-15

The AND operation implies that the output can be switched off by the SPI data bit input, even if the corresponding

parallel input is in the ON state.

SPI Priority for OFF-State

This also implies that the serial input data bit can only switch the output channel ON if the corresponding parallel

input is in the ON state.

If the AND operation is programmed it is latched until it is overwritten by the OR operation.

6.1.5.6

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 states will not be

changed and the shift register will be reset (at the next CS SO Data all ‘0’).

6.2

Diagnostics

For full diagnosis there are two diagnostic bits per channel configured as shown in Figure 21.

Figure 21

Two Bits per Channel Diagnostic Feedback

•

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.

•

Short Circuit to GND: If a drain to ground short circuit exists and the drain to ground current exceeds 100

µA,

short to ground is detected and the LL bit combination is set.

A definite distinction between open load and short to ground is specified by design.

The standard way of obtaining diagnostic information is as follows:

Clock in serial information into SI pin and wait approximately 150

µs to allow the outputs to settle. Clock in the

identical serial information once again - during this process the data coming out at SO contains the bit

combinations representing the diagnosis conditions as described in Figure 21.

Reset of the Diagnosis Register

The diagnosis register is reset after reading the diagnosis data (after the falling CS edge). This is done for

channels 1-8 and channels 9-16 separately depending on the previous command.

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