Datasheet

13

Rev. 1.2, 2014-05-09

SPI Driver for Enhanced Relay Control

SPIDER - TLE7231G

Power Stages

Maximum Load Inductance

During demagnetization of inductive loads, energy has to be dissipated in the TLE7231G.

This energy can be calculated with following equation:

The maximum energy, which is converted into heat, is limited by the thermal design of the component.

6.3

Timing Diagrams

The power transistors are switched on and off with a dedicated slope via the IN bits of the serial peripheral

interface SPI. The switching times

t

Figure 6

Switching a Resistive Load

In input mode, a high signal at the input pin is equivalent to a SPI ON command and a low signal to SPI OFF

command respectively. Please refer to Chapter 9.3 for details on operation modes.

The listed switching times are not valid, when switching to or from stand-by mode.

6.4

Electrical Characteristics Power Stages

–

DS(CL)

--------------------------------------- ln

⋅

1

⋅

–

DS(CL)

---------------------------------------

–

⎝⎠

⎜⎟

⎛⎞

+

L

------

⋅⋅

=

E

1

2

---

2

1

–

DS(CL)

---------------------------------------

–

⎝⎠

⎜⎟

⎛⎞

⋅

=

V

All voltages with respect to ground, positive current flowing into pin (unless otherwise specified)

typical values:

V

Pos.

Parameter

Symbol

Limit Values

Unit

Conditions

Min.

Typ.

Max.

Power Supply

6.4.1

Digital supply voltage

V

DD

3.0

–

5.5

V

–

6.4.2

Digital supply current all channels

ON

I

DD(ON)

––

100

µA

V

V

V

V

CS

t

SwitchOn.emf

t

20%

80%

SPI: ON

SPI: OFF