33984 View Datasheet(PDF) - Motorola => Freescale

Part Name

Description

Manufacturer

33984

Dual Intelligent High-Current Self-Protected Silicon High-Side Switch (4.0 mΩ)

Motorola => Freescale 

Freescale Semiconductor, Inc.

TERMINAL DEFINITIONS (continued)

Functional descriptions of many of these terminals can be found in the System/Application Information section beginning on

page 15.

Terminal

9

Terminal

Name

SI

Formal Name

Serial Input

Definition

This is a command data input terminal connected to the SPI Serial Data Output of the

MCU or to the SO terminal of the previous device of a daisy chain of devices. The input

requires CMOS logic-level signals and incorporates an active internal pulldown current

source. Device control is facilitated by the input's receiving the MSB first of a serial 8-

bit control command. The MCU ensures data is available upon the falling edge of

SCLK. The logic state of SI present upon the rising edge of SCLK loads that bit

command into the internal command shift register.

10

VDD

Digital Drain Voltage

This is an external voltage input terminal used to supply power to the SPI circuit. In the

(Power)

event VDD is lost, an internal supply provides power to a portion of the logic, ensuring

limited functionality of the device.

11

SO

Serial Output

This output terminal is connected to the SPI Serial Data Input terminal of the MCU or

to the SI terminal of the next device of a daisy chain of devices. This output will remain

tri-stated (high impedance OFF condition) so long as the CS terminal of the device is

logic HIGH. SO is only active when the CS terminal of the device is asserted logic LOW.

The generated SO output signals are CMOS logic levels. SO output data is available

on the falling edge of SCLK and transitions immediately on the rising edge of SCLK.

12

IN1

Serial Input

This input terminal is used to directly control the output HS1. This input has an active

internal pulldown current source and requires CMOS logic levels. This input may be

configured via SPI.

13

GND

Ground

This terminal is the ground for the logic and analog circuitry of the device.

14

VPWR

Positive Power Supply

This terminal connects to the positive power supply and is the source input of

operational power for the device. The VPWR terminal is a backside surface mount tab

of the package.

15

HS1

High-Side Output 1

Protected 4.0 mΩ high-side power output to the load.

16

HS0

High-Side Output 0

Protected 4.0 mΩ high-side power output to the load.

33984

4

MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA

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Go to: www.freescale.com

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