mc33291l Freescale Semiconductor, Inc, mc33291l Datasheet - Page 2

• Manufacturer Part Number: mc33291l
• Description: Eight-output Switch With Serial Peripheral Interface I/o
• Manufacturer: Freescale Semiconductor, Inc

2
33291L
Table 1. Fault Operation
SFPD
SCLK
SERIAL OUTPUT (SO) PIN REPORTS
Overvoltage
Overtemperature
Overcurrent
Output ON, Open Load Fault
Output OFF, Open Load Fault
DEVICE SHUTDOWNS
Overvoltage
Overtemperature
Overcurrent
PIN
RST
CS
SO
SI
10
15
22
16
4
9
3
Fault Timers
25 µA
10 µA
10 µA
Line Driver
10 µA
Serial D/O
10 µA
+
+
+
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.
Total device shutdown at V
(cleared). Outputs can be turned back on with a new SPI command after 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
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).
voltage
Over-
Figure 2. 33291L Simplified Block Diagram
OVD
V DD
RB
SFPD
SFL
CS
SCLK
SI
SO
CSI
CSBI
Interface
Logic
SPI
V
GE
PWR
OT
OF
SF
PWR
Regulator
Voltage
= 28 V to 36 V. All outputs are latched off while the SPI register is reset
21
From Detectors 1–7
temperature
Control
Detect
Circuit
Detect
Open
Short
Gate
Load
Detect
Over-
Bias
53 V
lLimit
To Gates
Analog Integrated Circuit Device Data
1–7
+
-
R S
PWR
Freescale Semiconductor
has decayed below 26.5 V.
µ s to 250 µ s delay, with
Output 0
24
Grounds
5–8, 17–20
Outputs
1, 2, 11–14, 23