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Freescale Semiconductor Electronic Components Datasheet

MCZ33298 Datasheet

Eight Output Switch

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Freescale Semiconductor
Technical Data
Eight Output Switch with Serial
Peripheral Interface I/O
Document Number: MC33298
Rev. 5.0, 10/2006
33298
The 33298 is a smart eight-output low-side power switch. It is a
versatile device incorporating an 8-bit serial-in shift register to control
an 8-bit parallel output latch providing control of eight independent
"ON/OFF" output switches. Applications include the control of
solenoids, relays, lamps, small DC-motors, and other moderate
current loads (1.0 – 3.0 A).
LOW-SIDE SWITCH
The 33298 interfaces directly with a microcontroller to control
various inductive or incandescent loads. Input control is fast. Data
rates are guaranteed to 2.0 MHz but the device is capable of rates to
8.5 MHz @ 25°C.
Each output uses high-efficiency MOSFET power transistors
configured with open drains. Each low "ON" resistance output (0.4
RDS(ON) @ 25°C) is capable of sinking up to 3.0 A of transient current.
On a continuous basis, each output can simultaneously (with all
outputs "ON") handle 0.5 A of current when the device is soldered onto
a typical PC board. Higher output currents are dependent on the
number of outputs simultaneously "ON". The circuit's innovative
monitoring and protection features include very low standby current.
DW SUFFIX
EG SUFFIX (PB-FREE)
98ASB42344B
24 SOICW
ORDERING INFORMATION
Device
Temperature
Range (TA)
Package
Features
• Designed to Operate Over Wide Supply Voltages of 5.5 to 26.5 V
• Interfaces to Microprocessor Using 8-Bit SPI I/O Protocol up to
MC33298DW/R2
MCZ33298EG/R2
-40°C to 125°C
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
24 SOIC
VDD
MCU
33298
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. 33298 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., 2006. All rights reserved.


Freescale Semiconductor Electronic Components Datasheet

MCZ33298 Datasheet

Eight Output Switch

No Preview Available !

MCZ33298 pdf
INTERNAL BLOCK DIAGRAM
INTERNAL BLOCK DIAGRAM
VDD
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
VDD
RB
SFPD
SFL
CS
SCLK
SI
SO
CSI
CSBI
GE
OT
SF
OF
SPI
Interface
Logic
Bias
Gate
Control
Open
Load
Detect
Short
Circuit
Detect
53 V
To Gates
1 to 7
lLimit
+
RS
Over
Temperature
Detect
From Detectors 1 to 7
OUTPUT 0
24
OUTPUT
1 to 7
2
11 - 14
23
GND 5-8
17-20
Figure 2. 33298 Simplified Block Diagram
Table 1. Fault Operation
SERIAL OUTPUT (SO) PIN REPORTS
Overvoltage
Overvoltage condition reported
Overtemperature
Fault reported by Serial Output (SO) pin
Overcurrent
SO pin reports short to battery/supply or over current condition
Output ON, Open Load Fault Not reported
Output OFF, Open Load Fault SO pin reports output OFF open load condition
DEVICE SHUTDOWNS
Overvoltage
Overtemperature
Overcurrent
Total device shutdown at VPWR = 28 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 over current shuts down at 1.0 to 3.0 A after a 70 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).
33298
2
Analog Integrated Circuit Device Data
Freescale Semiconductor


Part Number MCZ33298
Description Eight Output Switch
Maker Freescale Semiconductor
Total Page 28 Pages
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