SPI Driver for Enhanced Relay Control

SPIDER - TLE 7240SL

Input and Power Stages

Data Sheet

12

Rev. 1.1, 2009-04-15

Figure 4

Input matrix and logic

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 (all channel OFF).

5.2.1

Inductive Output Clamp

intends to continue driving the current. The voltage clamping is necessary to prevent destruction of the device,

see Figure 5 for details. Nevertheless, the maximum allowed load inductance is limited.

InputLogic.emf

IN3

IN2

I

IN 1

IN1

Channel 8

LHI

IN8

OFF

OFF

OFF

Channel 7

LHI

IN7

OFF

OFF

OFF

Channel 6

LHI

IN6

OFF

OFF

OFF

Channel 5

LHI

IN5

OFF

OFF

OFF

Channel 2

LHI

IN2

OFF

OFF

Channel 3

LHI

IN3

OFF

OFF

Channel 4

LHI

IN4

OFF

OFF

IN4

Channel 1

LHI

IN1

OFF

IN1

IN2

IN3

IN4

ON

ON

ON

ON

OFF

ON

ON

ON

ON

LHI

LHI