MLX10410 8 Fold High Side Driver

Page 2

Rev 1.1 16/Apr/01

3901010410

Page 2

Aug/02

Rev. 003

In order to switch a particular output, it is necessary to apply its address on the 3 bit bus and the data on the input

DATAI. A high level on STROBE will latch the data and switch the output. When the IC is in active mode and CEN is

high, the logic level of the addressed output will be available on the pin DATAO.

When all 8 outputs are inactive (latched value is low) the circuit automatically switches to power down mode.

Diagnostic mode: when the DATAI is low and the STROBE is high, a 50K pull up to VCC is switched on, on the

corresponding output channel (addressed by ADR2, ADR1, ADR0) to see whether there is a load connected. The logic

level of the output can be observed on the pin DATAO. In this way, it is possible to scan all the outputs for an open

circuit.

When the IC is in active mode, then there is an over-temperature sensor that monitors the temperature of the IC. If the

die temperature goes above 165

temperature decreases below 125

The outputs are short-circuit proof against GND and VCC. When an output is shorted to GND, the current is limited and,

after a delay of typically 20ms, the output is switched off and the output OTB goes low. A delay is used to guarantee that

the output does not detect a short circuit when a normal lamp is driven. The latched value of the ouput is set to 0. A

rising edge on CEN will set OTB back to 1. When an output is shorted to a supply larger than VCC+100mV, the output

driver bulk is immediately disconnect from VCC, and after a delay of typically 20ms, the output is switched off and the

output OTB goes low. The latched value of the ouput is set to 0. A rising edge on CEN will set OTB back to 1

There is an over-voltage shut off that switches all the outputs off when the VCC voltage is above 18V for at least 1ms.

When an over-voltage occurs, CEN being low, DATAO pin will go low. The outputs will come on again as soon as the

voltage decreases below 18V. The status of all 8 outputs stays latched.

Every output stage is protected with a free wheel diode both to ground and to VCC.

Active mode

CEN

STROBE

DATA I

Description

DATA O

OTB

0

0

0

0

0

1

Chip

0 Over-voltage

0

1

0

Disabled

1

No Over-

voltage

0

Over-temperature

0

1

1

OR

1

0

0

No Command

Addressed

output

Short-circuit to

GND

1

0

1

No Command

logic level

1

1

0

Addressed output

0

Load

1

No Over-

temperature

turned OFF

(Diagnostic mode)

1

No Load

1

1

1

Addressed output

turned ON

Addressed

output logic

level (always

1)

Table 1