4

NXP Semiconductors

33982

PIN CONNECTIONS

Pin connections

Figure 3. 33982 pin connections

Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on page 17.

Table 2. Pin definitions

Pin Number

Pin Name

Pin Function

Formal Name

Definition

1

CSNS

Output

Output Current

Monitoring

This pin is used to output a current proportional to the high-side output current

and used externally to generate a ground-referenced voltage for the

microcontroller to monitor output current.

2

WAKE

Input

Wake

This pin is used to input a logic [1] signal in order to enable the watchdog timer

function.

3RST

Input

Reset (Active Low)

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.

4

IN

Input

Direct Input

The Input pin is used to directly control the output.

5FS

Output

Fault Status

(Active Low)

This is an open drain configured output requiring an external pull-up resistor to

VDD for fault reporting.

6

FSI

Input

Fail-Safe Input

The value of the resistance connected between this pin and ground determines

the state of the output after a watchdog timeout occurs.

7CS

Input

Chip Select

(Active Low)

This input pin is connected to a chip select output of a master microcontroller

(MCU).

8

SCLK

Input

Serial Clock

This input pin is connected to the MCU providing the required bit shift clock for SPI

communication.

9

SI

Input

Serial Input

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

MCU or to the SO pin of the previous device in a daisy chain of devices.

10

VDD

Input

Digital Drain Voltage

(Power)

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

11

SO

Output

Serial Output

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

SI pin of the next device in a daisy chain of devices.

12

NC

NC

No Connect

This pin may not be connected.

HS

HS

16

15

VPWR

14

GND

13

1

11 10 9

8 7 6 5

4

3 2

12

TRANSPARENT

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