Data Sheet TLE 6220 GP

V2.1

Page

2007-05-03

6

Functional Description

The TLE 6220 GP is an quad-low-side power switch which provides a serial peripheral interface

(SPI) to control the 4 power DMOS switches, as well as diagnostic feedback. The power transis-

an active zener clamp.

The diagnostic logic recognises a fault condition which can be read out via the serial diagnostic

output (SO).

Circuit Description

Power Transistor Protection Functions

9)

Each of the four output stages has its own zener clamp, which causes a voltage limitation at the

power transistor when solenoid loads are switched off. The outputs are provided with a current

limitation set to a minimum of 3 A. The continuous current for each channel is 1A (all channels

ON; depending on cooling).

Each output is protected by embedded protection functions. In the event of an overload or

short to supply, the current is internally limited and the corresponding bit combination is set

(early warning). If this operation leads to an overtemperature condition, a second protection

level (about 170 °C) will change the output into a low duty cycle PWM (selective thermal shut-

down with restart) to prevent critical chip temperatures.

SPI Signal Description

pin. Whenever the pin is in a logic low state, data can be transferred from the µC and vice

versa.

outputs into the shift register.

- Serial input data can be clocked in from then on.

- SO changes from high impedance state to logic high or low

state corresponding to the SO bits.

- Reset of diagnosis register.

To avoid any false clocking the serial clock input pin SCLK should be logic low state during high

to low transition of

are ignored and SO is forced into a high impedance state.

9 )

The integrated protection functions prevent an IC destruction under fault conditions and may not be used in normal operation

or permanently

.