33291 データシートの表示（PDF） - Motorola => Freescale

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33291

Eight Output Switch with Serial Peripheral Interface I/O

Motorola => Freescale 

Freescale Semiconductor, Inc.

VDD

16

SFPD

15

RST

22

CS

10

SCLK

3

SI

4

SO

9

+

10 µA

25 µA

+

10 µA

Fault Timers

10 µA +

10 µA

Serial D/O

Line Driver

VPWR 21

Over

Voltage

Voltage

Regulator

OVD

GE

VDD

OT

RB

SF

SFPD

OF

SFL

CS

SCLK

SI

SO

SPI

Interface

Logic

CSI

CSBI

Bias

Gate

Control

Open

Load

Detect

Short

Circuit

Detect

53 V

To Gates

1 to 7

lLimit

+ RS

–

Over

Temperature

Detect

From Detectors 1 to 7

Figure 1. 33291 Simplified Block Diagram

Output 0

24

Outputs 1 to 7

2

11 - 14

23

Grounds 5-8

17-20

FAULT OPERATION

Serial Output (SO) Pin Reports

Over Voltage

Over voltage condition reported

Over Temperature

Fault reported by Serial Output (SO) pin

Over Current

SO pin reports short to battery/supply or over current condition

Output ON, Open Load Fault Not reported

Output OFF, Open Load Fault SO pin reports output OFF open load condition

Device Shutdowns

Over Voltage

Total device shutdown at VPWR = 28 to 36 V. All outputs are latched off while the SPI register is reset (cleared).

Outputs can be turned back on with a new SPI command after VPWR has decayed below 26.5 V.

Over Temperature

Only the output experiencing an over temperature condition turns OFF.

Over Current

Only the output experiencing an over current shuts down at 1.0 to 3.0 A after a 70 to 250 µs delay, with SFPD pin

grounded. All other outputs will continue to operate in a current limit mode, with no shutdown, if the SFPD pin is at

5.0 V (so long as the individual outputs are not experiencing thermal limit conditions).

33291

2

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