33291_08 Datasheet, PDF (2/27 Pages) Freescale Semiconductor, Inc – Eight-Output Switch with Serial Peripheral Interface I/O

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
V_DD
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
1–7
lLimit
+
-
R_S
Over-
temperature
Detect
From Detectors 1–7
Output 0
24
Outputs
1, 2, 11–14, 23
Grounds
5–8, 17–20
Figure 2. 33291 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 overcurrent 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 V_PWR = 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 V_PWR 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).
33291
2
Analog Integrated Circuit Device Data
Freescale Semiconductor