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33291 Schematic ( PDF Datasheet ) - Freescale Semiconductor

Teilenummer 33291
Beschreibung Eight-Output Switch
Hersteller Freescale Semiconductor
Logo Freescale Semiconductor Logo 




Gesamt 26 Seiten
33291 Datasheet, Funktion
www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
Eight-Output Switch with Serial
Peripheral Interface I/O
Document Number: MC33291
Rev. 4.0, 10/2006
33291
The 33291 device is an eight-output, low-side power switch with 8-
bit serial input control. The 33291 is a versatile circuit designed for
automotive applications, but is well suited for other environments. The
33291 incorporates SMARTMOS technology, with CMOS logic,
bipolar/MOS analog circuitry, and DMOS power MOSFETs. The 33291
interfaces directly with a microcontroller to control various inductive or
incandescent loads.
The circuit’s innovative monitoring and protection features include
very low standby current, SPI cascade fault reporting capability,
internal 53 V clamp on each output, output-specific diagnostics, and
independent shutdown of outputs.
The device is parametrically specified over an ambient temperature
range of -40°C TA 125°C and 9.0 V VPWR 16 V supply.
Features
• Designed to Operate Over Wide Supply Voltages of 5.5 V to 26.5 V
• Interfaces to Microprocessor Using 8-Bit SPI I/O Protocol up to 3.0
MHz
• 1.0 A Peak Current Outputs with Maximum RDS(ON) of 1.6 at TJ -
150°C
• Outputs Current-Limited to Accommodate In-Rush Currents
Associated with Switching Incandescent Loads
• Output Voltages Clamped to 53 V During Inductive Switching
• Maximum Sleep Current (IPWR) of 25 µA
• Maximum of 4.0 mA IDD During Operation
• Pb-Free Packaging Designated by Suffix Code EG
LOW-SIDE SWITCH
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42344B
24-PIN SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
MC33291DW/R2
MCZ33291EG/R2
-40°C to 125°C
24 SOICW
VDD
MCU
33291
VPWR OP 0
SFPD OP 1
VDD OP 2
CS
SCLK
SI
SO
RESET
OP 3
OP 4
OP 5
OP 6
OP 7
GND
V PWR
Figure 1. 33291 Simplified Application Schematic
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., 2006. All rights reserved.






33291 Datasheet, Funktion
ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
STATIC ELECTRICAL CHARACTERISTICS
Table 4. Static Electrical Characteristics
Characteristics noted under conditions 4.5 V VDD 5.5 V, 9.0 V VPWR 16 V, -40°C TA 125°C, unless otherwise noted.
Typical values noted reflect the approximate value with VBAT = 13 V, TA = 25°C.
Characteristic
Symbol
Min
Typ
Max Unit
POWER INPUT
Supply Voltage Range
Quasi-Functional (16)
Fully Operational
Supply Current (All Outputs ON, IOUT = 0.5 A)
Sleep State Supply Current at RST 0.2 VDD and/or VDD < 0.5 V
Sleep State Output Leakage Current (Per Output, RST = 0 V)
Overvoltage Shutdown
Overvoltage Shutdown Hysteresis (17)
Logic Supply Voltage
Logic Supply Current (18)
RST 0.7 VDD
RST 0.5 V
Logic Supply Undervoltage Lockout Threshold (19)
POWER OUTPUT
VPWR(QF)
VPWR(FO)
VPWR(ON)
IPWR(ON)
IPWR(SS)
VOV
VOV(HYS)
VDD
IDD
VDD(UVLO)
5.5
9.0
28
0.2
4.5
2.5
V
– 9.0
– 26.5
1.0 2.0 mA
1.0 2.5 µA
1.0 2.5 µA
32 36 V
0.8 1.5 V
– 5.5 V
1.0 4.0 mA
– 25 µA
– 3.5 V
Drain-to-Source ON Resistance (IOUT = 0.5 A, TJ - 25°C)
VPWR = 5.5 V
VPWR = 9.0 V
VPWR = 13 V
Drain-to-Source ON Resistance (IOUT = 0.5 A, TJ - 150°C)
VPWR = 5.5 V
VPWR = 9.0 V
VPWR = 13 V
RDS(ON)
– 2.0
– 0.6 1.2
– 0.55 1.0
RDS(ON)
– 3.0
1.2 1.6
1.0 1.2
Output Self-Limiting Current
Outputs Programmed ON, VOUT = 0.6 VDD
Output Fault Detect Threshold (20)
Output Programmed OFF
IOUT(LIM)
A
1.0 2.0 3.0
VOUTth(F)
V
2.5 3.0 3.5
Notes
16. SPI inputs and outputs operational. Fault status reporting may not be fully operational within this voltage range. Outputs remain
operational somewhat below this VPWR range, but RDS(ON) will increase, causing power dissipation to increase. Outputs will re-
establish their instructed state following a VPWR interruption as long as VDD remains non-interrupted.
17. This parameter is guaranteed by design, but it is not production tested.
18. Measured with the RST pin held at a logic high state. Outputs can be OFF or ON or in any combination thereof.
19. Device incorporates a power-ON reset function. For VDD less than the Undervoltage Lockout Threshold voltage, all data registers are
reset and all outputs are disabled.
20. Output Fault Detect Threshold with outputs programmed OFF. Output fault detect thresholds are the same for output opens and shorts.
33291
6
Analog Integrated Circuit Device Data
Freescale Semiconductor

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33291 pdf, datenblatt
FUNCTIONAL DESCRIPTION
INTRODUCTION
FUNCTIONAL DESCRIPTION
INTRODUCTION
The 33291 was conceived, specified, designed, and
developed for automotive applications. It is an eight-output
low-side power switch having 8-bit serial control. The 33291
incorporates SMARTMOS technology having CMOS logic,
bipolar/MOS analog circuitry, and independent state of the
art double diffused MOS (DMOS) power output transistors.
Many benefits are realized as a direct result of using this
mixed technology. A simplified block diagram delineates
33291 in Figure 2.
Where bipolar devices require considerable control
current for their operation, structured MOS devices, since
they are voltage controlled, require only transient gate
charging current affording a significant decrease in power
consumption. The CMOS capability of the SMARTMOS
process allows significant amounts of logic to be
economically incorporated into the monolithic design.
Additionally, the bipolar/MOS analog circuits embedded
within the updrain power DMOS output transistors monitor
and provide fast, independent protection control functions for
each individual output. All outputs have internal 45 V at 0.5 A
independent output voltage clamps to provide fast inductive
turn-off and transient protection.
The 33291 uses high-efficiency updrain power DMOS
output transistors exhibiting very low room temperature
drain-to-source ON resistance values (RDS(ON) 1.0 at
13 V VPWR) and dense CMOS control logic. Operational bias
currents of less than 2.0 mA (1.0 mA typical) with any
combination of outputs ON are the result of using this mixed
technology and would not be possible with bipolar structures.
To accomplish a comparable functional feature set using a
bipolar structure approach would result in a device requiring
hundreds of milliamperes of internal bias and control current.
This would represent a very large amount of power to be
consumed by the device itself and not available for load use.
During operation, the 33291 functions as an eight output
serial switch serving as a microcontroller (MCU) bus
expander and buffer with fault management and fault
reporting features. In doing so, the device directly relieves the
MCU of the fault management functions. The 33291 directly
relieves the MCU of the fault management functions. The
33291 directly interfaces to an MCU, operating at system
clock serial frequencies in excess of 3.0 MHz. It uses a
Synchronous Peripheral Interface (SPI) for control and
diagnostic readout. Figure 13 illustrates the basic SPI
configuration between an MCU and one 33291.
MC68HCXX
Microcontroller
Shift Register
MOSI
MISO
33291
SI
Shift Register
SO
Receive
Buffer
Parallel
Ports
SCLK
RST
CS
To
Logic
Figure 13. SPI Interface with Microcontroller
The circuit can also be used in a variety of other
applications in the computer, telecommunications, and
industrial fields. It is parametrically specified over an input
battery/supply range of 9.0 V to 16 V but is designed to
operate over a considerably wider range of 5.5 V to 26.5 V.
The design incorporates the use of logic level MOSFETs as
output devices. These MOSFETs are sufficiently turned ON
with a gate voltage of less than 5.0 V, thus eliminating the
need for an internal charge pump. Each output is identically
sized and independent in operation. The efficiency of each
output transistor is such that at room temperature with as little
as 9.0 V supply (VPWR), the maximum RDS(ON) of an output
at room temperature is 1.2 (0.9 typical) and increases to
only 2.0 as VPWR is decreased to 5.5 V.
All inputs are compatible with 5.0 V CMOS logic levels,
incorporating negative or inverted logic. Whenever an input is
programmed to a logic low state (<1.0 V) the corresponding
low side switched output being controlled will be active low
and turned ON. Conversely, whenever an input is
programmed to a logic high state (>3.0 V), the output being
controlled will be high and turned OFF.
One main advantage of the 33291 is the serial port. When
coupled to an MCU, it receives ON/OFF commands from the
MCU and in return transmits the drain status of the device’s
output switches. Many devices can be daisy-chained
together, forming a larger system, as illustrated in Figure 14,
page 13.
Note In this example, only one dedicated MCU parallel
port (aside from the required SPI) is required for chip select
to control 32 possible loads.
33291
12
Analog Integrated Circuit Device Data
Freescale Semiconductor

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