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Freescale Semiconductor Electronic Components Datasheet

MC33984B Datasheet

Dual Intelligent High-Current Self Protected Silicon High-Side Switch

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MC33984B pdf
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Advance Information
Document Number: MC33984
Rev. 9.0, 1/2007
Dual Intelligent High-Current
Self-Protected Silicon
High-Side Switch (4.0 mΩ)
33984B
The 33984 is a dual self-protected 4.0 msilicon switch used to
replace electromechanical relays, fuses, and discrete devices in
power management applications. The 33984 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
each output. SPI-programmable fault trip thresholds allow the device
to be adjusted for optimal performance in the application.
The 33984 is packaged in a power-enhanced 12 x 12 nonleaded
PQFN package with exposed tabs.
Features
• Dual 4.0 mMax 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 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, Undervoltage and Overvoltage Shutdown, Fail-
Safe Pin Status, and Program Status
• Enhanced -16 V Reverse Polarity VPWR Protection
HIGH-SIDE SWITCH
BOTTOM VIEW
PNA SUFFIX
98ARL10521D
16-PIN PQFN
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33984BPNA/R2 -40°C to 125°C
16 PQFN
VDD
VDD
I/O
I/O
SO
SCLK
MCU CS
SI
I/O
I/O
I/O
A/D
VDD
VPWR
33984B
VDD
VPWR
FS
WAKE
SI
SCLK
CS
SO
RST
INO
IN1
CSNS
FSI
HS1
HS0
GND
GND
LOAD
LOAD
Figure 1. 33984 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. All rights reserved.



Freescale Semiconductor Electronic Components Datasheet

MC33984B Datasheet

Dual Intelligent High-Current Self Protected Silicon High-Side Switch

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MC33984B pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
CS
SO
SI
SCLK
FS
IN[0:1]
RST
WAKE
FSI
VDD
VPWR
VIC
IUP
Internal
Regulator
Overvoltage
Protection
SPI
3.0 MHz
Logic
IDWN
RDWN
Programmable
Switch Delay
0 ms –525 ms
Selectable Slew
Rate Gate Drive
Selectable Overcurrent
High Detection
100 A or 75 A
Selectable Over-
current Low Detection
Blanking Time
0.15 ms–155 ms
Overtemperature
Detection
Selectable Overcurrent
Low Detection
7.5 A –25 A
Open Load
Detection
HS0
HS0
Programmable
Watchdog
310 ms–2500 ms
VIC
IUP
HS1
HS1
Selectable
Output Current
Recopy
1/20500 or 1/41000
GND
Figure 2. 33984 Simplified Internal Block Diagram
CSNS
33984
2
Analog Integrated Circuit Device Data
Freescale Semiconductor



Freescale Semiconductor Electronic Components Datasheet

MC33984B Datasheet

Dual Intelligent High-Current Self Protected Silicon High-Side Switch

No Preview Available !

MC33984B pdf
PIN CONNECTIONS
PIN CONNECTIONS
12 11 10 9 8 7 6 5 4 3 2 1
13
GND
14
VPWR
TRANSPARENT
TOP VIEW
15 16
HS1 HS0
Figure 3. 33984 Pin Connections (Transparent Top View)
Table 1. Pin Definitions
Functional descriptions of many of these pins can be found in the Functional Pin Description section beginning on page 16.
Pin
Pin Name
Pin
Function
Formal Name
Definition
1
CSNS
Output Output Current Monitoring This pin is used to output a current proportional to the designated
HS0-1 output.
2
WAKE
Input
Wake
This pin is used to input a Logic [1] signal so as to enable the
watchdog timer function.
3
RST
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 IN0 Input
Direct Input 0
This input pin is used to directly control the output HS0.
5
FS
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 outputs after a watchdog timeout occurs.
7
CS
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 of a daisy
chain of devices.
10
VDD
Input
Digital Drain Voltage
This is an external voltage input pin used to supply power to the SPI
(Power)
circuit.
Analog Integrated Circuit Device Data
Freescale Semiconductor
33984
3




Part Number MC33984B
Description Dual Intelligent High-Current Self Protected Silicon High-Side Switch
Maker Freescale Semiconductor
Total Page 30 Pages
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