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MC33996 Scheda tecnica(PDF) 11 Page - Freescale Semiconductor, Inc

Il numero della parte MC33996
Spiegazioni elettronici  16 Output Switch with SPI Control
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC33996 Scheda tecnica(HTML) 11 Page - Freescale Semiconductor, Inc

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Analog Integrated Circuit Device Data
Freescale Semiconductor
11
33996
FUNCTIONAL DESCRIPTION
OPERATIONAL MODES
OPERATIONAL MODES
On each SPI communication, a 24 bit command word is
sent to the 33996 and 24 bit fault word is received from the
33996. The Most Significant Bit (MSB) is sent and received
first.
Command Register Definition:
0 = Output Command Off
1 = Output Command On
SO Definition:
0 = No fault
1 = Fault
MCU INTERFACE DESCRIPTION
In operation the 33996 functions as a 16-output serial
switch serving as a microcontroller (MCU) bus expander and
buffer with fault management and fault reporting features. In
doing so, the device directly relieves the MCU of the fault
management functions.
The 33996 directly interfaces to an MCU and operates at
system clock serial frequencies up to 6.0MHz using a Serial
Peripheral Interface (SPI) for control and diagnostic readout.
Figure 9 shows the basic SPI configuration between an
MCU and one 33996.
Figure 9. 33996 SPI Interface with Microcontroller
All inputs are compatible with 3.3/5.0V CMOS logic levels
and incorporate positive logic. An input that is programmed to
a logic low state (< 0.8V) will have the corresponding output
OFF. Conversely, an input programmed to a logic high state
(> 2.2V) will have the output being controlled ON.
Table 5. Fault Operation
Serial Output (SO) Pins Reports
Over-temperature
Fault reported by Serial Output (SO) pin.
Over-current
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
Over-voltage
Total device shutdown at VPWR = 27.5 V to 35 V. Resumes normal operation with proper voltage.
Upon recovery all outputs assume previous state or OFF based on the Overvoltage bit in the Global
Shutdown/Retry Control Register.
Over-temperature
Only the output experiencing an over-temperature fault shuts down. Output may auto-retry or remain
off according to the control bits in the Global Shutdown/Retry Control Register.
Over-current
Output will remain in current limit 0.9 A to 2.5 A until thermal limit is reached. When thermal limit is
reached, device will enter over-temperature shutdown. Output will operate as programmed in the
Global Shutdown/Retry Control Register. Fault flag in SO Response word will be set.
33996
MC68HCXX
Microcontroller
Receive
Buffer
Parallel
Ports
To Logic
24-Bit Shift Register
Shift Register
MOSI
SI
MISO
SO
SCLK
RST
CS
PWM


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