Analog Integrated Circuit Device Data

Freescale Semiconductor

3

33894

PIN CONNECTIONS

PIN CONNECTIONS

Figure 3. 33894 Pin Connections

Table 1. 33894 Pin Definitions

Functional descriptions of many of these pins can be found in Functional Description on page 16.

Pin Number

Pin Name

Formal Name

Definition

1

CSNS

Output Current

Monitoring

The Current Sense pin sources a current proportional to the designated HS0:HS3

output. That current is fed into a ground-referenced resistor and its voltage is monitored

by an MCU's A/D. The output to be monitored is selected via the SPI. This pin can be

tri-stated through SPI.

2

3

5

6

IN0

IN1

IN2

IN3

Serial Inputs

The IN0:IN3 high-side input pins are used to directly control HS0:HS3 high-side output

pins, respectively. An SPI register determines if each input is activated or if the input

logic state is ORed or ANDed with the SPI instruction. These pins are to be driven with

5.0 V CMOS levels, and they have an active internal pulldown current source.

4, 20

NC

No Connect

These pins may not be connected.

7

FS

Fault Status

(Active Low)

This pin is an open drain configured output requiring an external pullup resistor to VDD

for fault reporting. If a device fault condition is detected, this pin is active LOW. Specific

device diagnostic faults are reported via the SPI SO pin.

8

WAKE

Wake

This input pin controls the device mode and watchdog timeout feature if enabled. An

internal clamp protects this pin from high damaging voltages when the output is current

limited with an external resistor. This input has a passive internal pulldown.

9

RST

Reset

This input pin is used to initialize the device configuration and fault registers, as well as

place the device in a low-current sleep mode. The pin also starts the watchdog timer

when transitioning from logic [0] to logic [1]. This pin should not be allowed to be

Transparent Top View of Package

13

24

12

10

9

8

7

6

5

4

3

2

1

11

23

22

19

20

21

16

17

18

15

14

SO

GND

HS3

HS1

NC

HS0

HS2

GND

FSI

GND

V

PWR