SPI Driver for Enhanced Relay Control

SPIDER - TLE7233EM

Power Stages

Data Sheet

14

Rev. 1.2, 2014-05-09

6

Power Stages

The TLE7233EM is a four channel low-side relay switch.

The power stages are made of N-channel vertical power MOSFET transistors.

6.1

Input Circuit

The TLE7233EM has four input pins, which can be configured to be used for control of the output stages. The INn

parameter of the SPI provide the following operation modes (see Figure 5):

•

channel is in off mode without diagnosis

(if all channels are programmed to this mode, the device goes into idle mode)

•

channel is switched according to signal level at input pin INn

•

channel is switched on with active diagnosis

•

channel is switched off with active diagnosis

Figure 4 shows the input circuit of TLE7233EM.

Figure 4

Input signal conditioning circuit on all input and limp home pins

The current sink to ground ensures that the channels switch off in case of open input pin. The zener diode protects

the input circuit against ESD pulses. After power-on reset, the device enters idle mode.

IN

I

IN

InputStage.emf