Freescale Semiconductor
Advance Information
Document Number: MC33982
Rev. 18.0, 9/2014
Single Intelligent High-current Self-
protected High-side Switch
(2.0 mOhm)
The 33982 is a self-protected silicon 2.0 mOhm high-side switch used to replace
electromechanical relays, fuses, and discrete devices in power management
applications. The 33982 is designed for harsh environments and includes self-
recovery features. The device is suitable for loads with high inrush current, as
well as motors and all types of resistive and inductive loads.
Programming, control, and diagnostics are implemented via the serial peripheral
interface (SPI). A dedicated parallel input is available for alternate and pulse-
width modulation (PWM) control of the output. SPI-programmable fault trip
thresholds allow the device to be adjusted for optimal performance in the
application.
Features
Single 2.0 m max high-side switch with parallel input or SPI control
6.0 V to 27 V operating voltage with standby currents < 5.0
A
Output current monitoring with two SPI-selectable current ratios
SPI control of overcurrent limit, overcurrent fault blanking time, output OFF
open load detection, output ON/OFF control, watchdog timeout, slew
rates, and fault status reporting
• SPI status reporting of overcurrent, open and shorted loads,
overtemperature shutdown, undervoltage and overvoltage shutdown,
Fail-safe pin status, and program status
• Enhanced -16 V reverse polarity V
PWR
protection
•
•
•
•
33982
HIGH-SIDE SWITCH
Bottom View
FK SUFFIX
SCALE 1:1
98ARL10521D
16-PIN PQFN
Applications
• DC motor or solenoid
• Resistive and inductive loads
• Low-voltage lighting
V
DD
V
DD
V
DD
V
PWR
33982
VDD
I/O
I/O
SO
SCLK
FS
WAKE
SI
SCLK
CS
SO
RST
IN
LOAD
A/D
CSNS
FSI
GND
GND
HS
VPWR
GND
MCU
CS
SI
I/O
I/O
PWR GND
Figure 1. 33982 Simplified Application Diagram
* This document contains certain information on a new product.
Specifications and information herein are subject to change without notice.
© Freescale Semiconductor, Inc., 2007-2014. All rights reserved.
PIN CONNECTIONS
PIN CONNECTIONS
WAKE
CSNS
SCLK
VDD
RST
FSI
12 11 10 9
Figure 3. 33982 Pin Connections
Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on
page 16.
Table 2. Pin Definitions
Pin Number
1
Pin Name
CSNS
Pin Function
Output
Formal Name
Output Current
Monitoring
Wake
Reset (Active Low)
Direct Input
Fault Status
(Active Low)
Fail-Safe Input
Chip Select
(Active Low)
Serial Clock
Serial Input
Digital Drain Voltage
(Power)
Serial Output
No Connect
Definition
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.
This pin is used to input a logic [1] signal in order to enable the watchdog timer
function.
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 Input pin is used to directly control the output.
This is an open drain configured output requiring an external pull-up resistor to
VDD for fault reporting.
The value of the resistance connected between this pin and ground determines
the state of the output after a watchdog timeout occurs.
This input pin is connected to a chip select output of a master microcontroller
(MCU).
This input pin is connected to the MCU providing the required bit shift clock for SPI
communication.
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.
This is an external voltage input pin used to supply power to the SPI circuit.
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.
This pin may not be connected.
NC
SO
CS
FS
IN
15
HS
SI
8 7
6 5
4
3 2
1
13
GND
TRANSPARENT
TOP VIEW
14
VPWR
16
HS
2
3
4
5
6
7
8
9
10
11
12
WAKE
RST
IN
FS
FSI
CS
SCLK
SI
VDD
SO
NC
Input
Input
Input
Output
Input
Input
Input
Input
Input
Output
NC
33982
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
Table 2. Pin Definitions (continued)
Pin Number
13
14
15, 16
Pin Name
GND
VPWR
HS
Pin Function
Ground
Input
Output
Formal Name
Ground
Positive Power
Supply
High-side Output
Definition
This pin is the ground for the logic and analog circuitry of the device.
This pin connects to the positive power supply and is the source input of
operational power for the device.
Protected high-side power output to the load. Output pins must be connected in
parallel for operation.
33982
Analog Integrated Circuit Device Data
Freescale Semiconductor
5
Power technology
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