MC33298 Motorola, MC33298 Datasheet - Page 2

• Manufacturer Part Number: MC33298
• Description: OCTAL SERIAL SWITCH (SPI Input/Output)
• Manufacturer: Motorola

SERIAL OUTPUT (SO) PIN REPORTS
DEVICE SHUTDOWNS
Overvoltage
Over Temperature
Over Current
Output “On,” Open Load Fault
Output “Off,” Open Load Fault
Overvoltage
Over Temperature
Over Current
Reset
2
SFPD
SCLK
V DD
CSB
SO
SI
20 A
Timers
Line Driver
Serial D/O
Fault
20 A
Overvoltage
Detect
Overvoltage condition reported.
Fault reported by Serial Output (SO) pin.
SO pin reports short to battery/supply or over current condition.
Not reported.
SO pin reports output “off” open load condition.
Total device shutdown at V PWR = 28–36 V. Re–operates when overvoltage is removed with
all outputs assuming an off state upon recovery from overvoltage. All device registers are
automatically reset (cleared) during shutdown.
Only the output experiencing an over temperature shuts down.
Only the output experiencing an over current condition shuts down at 3.0 A to 6.0 A after a
25 s to 100 s delay, with SFPD pin grounded. All outputs will continue to operate in a current
limit mode, with no shutdown, if the SPFD pin is at 5.0 V.
OVD
RB
SFPDB
SFL
CSB
SCLK
SI
SO
CSI
CSBI
Figure 1. Simplified Block Diagram
Interface
Logic
SPI
FAULT OPERATION
V PWR
GE
OT
Regulator
SF
OF
MC33298
Voltage
From Detectors 1 to 7
Bias
Detect
Circuit
Detect
Control
Open
Load
Short
Temperature
Gate
Detect
Over
MOTOROLA ANALOG IC DEVICE DATA
I Limit
65 V
To Gates
1 – 7
R S
Output 0
Grounds
Outputs
1 – 7