Freescale Semiconductor
Technical Data
Document Number: MC33982
Rev. 16.0, 11/2009
Single Intelligent High-current
Self-protected Silicon High Side
Switch (2.0 mΩ)
The 33982 is a self-protected silicon 2.0 mΩ high side switch used
to replace electromechanical relays, fuses, and discrete devices in
power management applications. The 33982 is designed for harsh
environments, and it 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.
The 33982 is packaged in a power-enhanced 12 x 12 nonleaded
PQFN package with exposed tabs.
Features
• Single 2.0 mΩ max high side switch with parallel input or SPI
control
• 6.0 V to 27 V operating voltage with standby currents < 5.0
μA
• Output current monitoring with two SPI-selectable current ratios
• SPI control of over-current limit, over-current fault blanking time,
output-OFF open load detection, output ON/OFF control,
watchdog timeout, slew rates, and fault status reporting
• SPI status reporting of over-current, open and shorted loads,
over-temperature shutdown, under-voltage and over-voltage
shutdown, fail-safe pin status, and program status
• Enhanced -16 V reverse polarity V
PWR
protection
V
DD
V
DD
V
DD
33982B/C
HIGH SIDE SWITCH
Bottom View
PNA SUFFIX
SCALE 1:1
98ARL10521D
16-PIN PQFN
ORDERING INFORMATION
Device
MC33982BPNA/R2
MC33982CPNA/R2
Temperature
Range (T
A
)
-40°C to 125°C
Package
16 PQFN
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
Freescale Semiconductor, Inc. reserves the right to change the detail specifications,
as may be required, to permit improvements in the design of its products.
© Freescale Semiconductor, Inc., 2007-2009. All rights reserved.
PIN CONNECTIONS
PIN CONNECTIONS
WAKE
CSNS
SCLK
VDD
RST
FSI
12 11 10 9
NC
Figure 3. 33982 Pin Connections
Table 2. Pin Definitions
Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on
page 16.
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
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.
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
WAKE
RST
IN
FS
FSI
CS
SCLK
SI
Input
Input
Input
Output
Input
Input
Input
Input
10
VDD
Input
Digital Drain Voltage
(Power)
33982
4
Analog Integrated Circuit Device Data
Freescale Semiconductor
PIN CONNECTIONS
Table 2. Pin Definitions (continued)
Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on
page 16.
Pin
Number
11
12
13
14
15, 16
Pin Name
SO
NC
GND
VPWR
HS
Pin
Function
Output
NC
Ground
Input
Output
Formal Name
Serial Output
No Connect
Ground
Positive Power
Supply
High Side Output
Definition
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.
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
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