TLE 5250

Semiconductor Group

8

1998-02-01

Bits 10, 11

With these bits it is possible to detect the status of the gate voltages of the lower output-

stage transistors T3 and T4. Bit 10: status for EN edge transition. Bit 11: whether the

lower transistor has at all been turned on.

Bit 12 indicates whether the nominal/actual comparator has switched. The comparator

switches when the output current is regulated.

Bits 13, 14, 15

These bits indicate the presence of overcurrent, undervoltage or overtemperature. A

fault is ORed and output direct by bit 0 on DI.

When the multiplexer is read out, bits 0 through 15 are output once non-inverted (Phase

= Low) and once inverted (Phase = High).

Bit Assignment in Error Register

Bit 0

=

High for overtemperature/undervoltage/overcurrent

Bit 1

=

always High

Bit 2

=

High when sink transistor Q1 turned on

Bit 3

=

High when sink transistor Q2 turned on

Bit 4

=

High when source transistor Q1 turned on

Bit 5

=

High when source transistor Q2 turned on

Bits 2-5 =

momentary states for readout

Bit 6

=

bit 2 state for falling edge of Enable signal

Bit 7

=

bit 3 state for falling edge of Enable signal

Bit 8

=

bit 4 state for falling edge of Enable signal

Bit 9

=

bit 5 state for falling edge of Enable signal

Bits 6-10

represent status of outputs for negative change in edge of Enable signal

Bit 11

=

High if gate-source voltage of sink transistors is > 5 V at moment of readout

Bits 11-15

are set if event occurs during switching (Enable = High)

Bit 11

=

High if sink transistor V

Bit 12

=

High if actual current lower than nominal current

Bit 13

=

High if overcurrent detected on source transistors

Bit 14

=

High if undervoltage detected

Bit 15

=

High if thermal link tripped

The memories are erased by a rising edge on the Enable input.