MC33984CHFK FREESCALE [Freescale Semiconductor, Inc], MC33984CHFK Datasheet - Page 29

• Manufacturer Part Number: MC33984CHFK
• Description: Dual Intelligent High-current Self-protected Silicon High Side Switch (4.0 mOhm)
• Manufacturer: FREESCALE [Freescale Semiconductor, Inc]

normal operating conditions for junction temperatures from -
40 to 150°C. In case of permanent short-circuit conditions,
the duration and number of activation cycles must be limited
with a dedicated MCU fault management, using the fault
reporting through the SPI. When driving DC motor or
Solenoid loads demanding multiple switching, an external
recirculation device must be used to maintain the device in its
Safe Operating Area.
33984, Dual 4.0 mΩ High Side Switch. This device is a self-
protected silicon switch used to replace electromechanical
relays, fuses, and discrete circuits in power management
applications. The MC33984 features a current recopy which
is proportional to the load current. It can be configured
between 2 ratios via SPI (CSR0 and CSR1).
device and the improvement of this feature with the
calibration practice.
Analog Integrated Circuit Device Data
Freescale Semiconductor
The loads must be chosen in order to guarantee the device
Two application notes are available:
This section relates to the output current monitoring for
This section presents the current recopy tolerance of the
MCU
SCLK
V
DD
A/D
SO
I/O
I/O
CS
I/O
I/O
SI
V
PWR
2.2k
V
DD
10k
Regulator
NC V
Voltage
1 k
10 k
10 k
10 k
10 k
10 k
10 k
100 nF
OUTPUT CURRENT MONITORING
PWR
TYPICAL APPLICATIONS
Figure 11. Typical Applications
V
10 µF
DD
RFSI
V
12
11
2
4
8
7
3
9
5
1
6
DD
10
VDD
WAKE
IN0
IN1
SCLK
CS
RST
SO
SI
FS
CSNS
FSI
• AN3274, which proposes safe configurations of the
• AN2469, which provides guidelines for Printed Circuit
optimize the board design and PCB layout, in order to reach
electromagnetic compatibility standards (emission and
immunity).
CURRENT RECOPY TOLERANCE
and
• part to part deviation due to manufacturing,
• ambient temperature derating (from -40 to 125°C),
• battery voltage range (from 9 to 16 V).
production lots (initial testing only), the effect of each
contributor has been demonstrated.
eXtreme Switch devices in case of application faults, and
to protect all circuitry with minimum external components.
Board (PCB) design and assembly.
Development effort will be required by the end users to
The Current Sense Ratio Accuracies described page
Thanks to statistical data analysis performed on 3
10
33984
(CSR0_ACC and CSR1_ACC) take into account:
VPWR
GND
HS1
HS0
14
15
16
13
V
2.5 µF
PWR
LOAD
10 nF
TYPICAL APPLICATIONS
LOAD
33984
9
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