Analog Integrated Circuit Device Data

2

Freescale Semiconductor

33291L

Figure 2. 33291L Simplified Block Diagram

V

Gate

Control

Open

Load

Detect

Short

Circuit

Detect

Over-

temperature

Detect

Over-

voltage

Voltage

Regulator

Serial D/O

Line Driver

OVD

VDD

RB

SFPD

SFL

CS

SCLK

SI

SO

CSI

CSBI

GE

OT

SF

OF

SPI

Interface

Logic

+

-

Fault Timers

+

+

+

10

µA

25

µA

10

µA

Bias

To Gates

1–7

Output 0

24

Outputs

From Detectors 1–7

RS

lLimit

53 V

1, 2, 11–14, 23

PIN

SFPD

RST

CS

SCLK

SI

SO

16

15

22

10

3

4

9

10

µA

10

µA

Grounds

5–8, 17–20

Table 1. Fault Operation

SERIAL OUTPUT (SO) PIN REPORTS

Overvoltage

Overvoltage condition reported.

Overtemperature

Fault reported by Serial Output (SO) pin.

Overcurrent

SO pin reports short to battery/supply or overcurrent condition.

Output ON, Open Load Fault

Not reported.

Output OFF, Open Load Fault

SO pin reports output OFF open load condition.

DEVICE SHUTDOWNS

Overvoltage

Overtemperature

Only the output experiencing an overtemperature condition turns OFF.

Overcurrent

Only the output experiencing an overcurrent shuts down at 1.0 A to 3.0 A after a 70

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).