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Freescale Semiconductor Electronic Components Datasheet

33291L Datasheet

Eight-Output Switch

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www.DFaretaeSshceeatl4eUS.ceommiconductor
Technical Data
Eight-Output Switch with Serial
Peripheral Interface I/O
Document Number: MC33291L
Rev. 4.0, 11/2006
33291L
The 33291L device is an eight-output, low-side power switch with 8-
bit serial input control. The 33291L is a versatile circuit designed for
automotive applications, but is well suited for other environments. The
33291L incorporates SMARTMOS technology, with CMOS logic,
bipolar/MOS analog circuitry, and DMOS power MOSFETs. The
33291L 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
MC33291LDW/R2
-40°C to 125°C
MCZ33291LEG/R2
24 SOICW
VDD
MCU
33291L
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. 33291L 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., 2007. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

33291L Datasheet

Eight-Output Switch

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PIN
16
SFPD
15
RST
22
CS
10
SCLK
3
SI
4
SO
9
+
10 µA
25 µA
+
10 µA
Fault Timers
10 µA +
10 µA
Serial D/O
Line Driver
VPWR 21
Over-
voltage
Voltage
Regulator
OVD
GE
VDD
RB
OT
SF
SFPD
OF
SFL
CS
SCLK
SI
SO
SPI
Interface
Logic
CSI
CSBI
Bias
Gate
Control
Open
Load
Detect
Short
Circuit
Detect
53 V
To Gates
1–7
lLimit
+
-
RS
Over-
temperature
Detect
From Detectors 1–7
Output 0
24
Outputs
1, 2, 11–14, 23
Grounds
5–8, 17–20
Figure 2. 33291L Simplified Block Diagram
Table 1. Fault Operation
SERIAL OUTPUT (SO) PIN REPORTS
Overvoltage
Overtemperature
Overcurrent
Output ON, Open Load Fault
Output OFF, Open Load Fault
Overvoltage condition reported.
Fault reported by Serial Output (SO) pin.
SO pin reports short to battery/supply or overcurrent condition.
Not reported.
SO pin reports output OFF open load condition.
DEVICE SHUTDOWNS
Overvoltage
Overtemperature
Overcurrent
Total device shutdown at VPWR = 28 V to 36 V. All outputs are latched off while the SPI register is reset
(cleared). Outputs can be turned back on with a new SPI command after VPWR has decayed below 26.5 V.
Only the output experiencing an overtemperature condition turns OFF.
Only the output experiencing an overcurrent shuts down at 1.0 A to 3.0 A after a 70 µs to 250 µs delay, with
SFPD pin grounded. All other outputs will continue to operate in a current limit mode with no shutdown if the
SFPD pin is at 5.0 V (so long as the individual outputs are not experiencing thermal limit conditions).
33291L
2
Analog Integrated Circuit Device Data
Freescale Semiconductor


Part Number 33291L
Description Eight-Output Switch
Maker Freescale Semiconductor
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33291L Datasheet PDF






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