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參數(shù)資料
| 型號： | MC33880 |
| 廠商： | 飛思卡爾半導體(中國)有限公司 |
| 英文描述： | Configurable Octal Serial Switch with Serial Peripheral Interface I/O(可配置的8串行開關,帶串行外圍I/O口(SPI)) |
| 中文描述： | 配置八路系列開關串行外設接口輸入/輸出（可配置的8串行開關，帶串行外圍的I / O口（SPI）的） |
| 文件頁數(shù)： | 19/24頁 |
| 文件大小： | 741K |
| 代理商： | MC33880 |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33880
19
FAULT OPERATION
On each SPI communication, an 8-bit command word is sent
to the 33880 and an 8-bit fault word is received from the 33880.
The Most Significant Bit (MSB) is sent and received first (see
below).
Command Register Definition:
0 = Output Command Off
1 = Output Command On
Fault Register Definition:
0 = No fault
1 = Fault.
APPLICATIONS
Power Consumption
The 33880 device has been designed with one sleep and
one operational mode. In the sleep mode (V
DD
≤
2.0 V), the
current consumed by V
PWR
pin is less than 25
μ
A. To place the
33880 in the sleep mode, turn all outputs off, then remove
power from V
DD
and the EN (enable) input pin. Prior to
removing power from the device, it is recommended all control
inputs from the microcontroller are low. During normal
operation, 4.0 mA will be drawn from the V
DD
supply and 12 mA
from the V
PWR
supply.
Paralleling of Outputs
Using MOSFETs as output switches allows the connection of
any combination of outputs together. R
DS(ON)
of MOSFETs
have an inherent positive temperature coefficient, providing
balanced current sharing between outputs without destructive
operation. The device can even be operated with all outputs tied
together. This mode of operation may be desirable in the event
the application requires lower power dissipation or the added
capability of switching higher currents. Performance of parallel
operation results in a corresponding decrease in R
DS(ON)
while
the outputs OFF open load detect currents and the output
current limits increase correspondingly (by a factor of eight if all
outputs are paralleled). Paralleling outputs from two or more
different IC devices are possible but not recommended.
Fault Logic Operation
Fault logic of the 33880 device has been greatly simplified
over other devices using SPI communications. As command
word one is being written into the shift register, a fault status
word is being simultaneously written out and received by the
MCU. Regardless of the configuration, with no outputs faulted,
all status bits being received by the MCU will be zero. When
outputs are faulted (off state open circuit or on state short
circuit/overtemperature), the status bits being received by the
MCU will be one. The distinction between open circuit fault and
short circuit/overtemperature is completed via the command
word. For example, when a zero command bit is sent and a one
fault is received in the following word, the fault is open/short-to-
battery for high-side drive or open/short to ground for low-side
drive. In the same manner, when a one command bit is sent and
a one fault is received in the following word the fault is a short-
to-ground/overtemperature for high-side drive or short-to-
battery/overtemperature for low-side drive. The timing between
two write words must be greater than 300
μ
s to allow adequate
time to sense and report the proper fault status.
MSB
LSB
OUT8
OUT7
OUT6
OUT5
OUT4
OUT3
OUT2
OUT1
Table 1. Fault Operation
Serial Output (SO) Pins Reports
Overtemperature
Fault reported by Serial Output (DO) pin.
Overcurrent
DO pin reports short to battery/supply or overcurrent condition.
Output ON Open Load Fault
Not reported.
Output OFF Open Load Fault
DO pin reports output OFF open load condition.
Device Shutdowns
Overvoltage
Total device shutdown at V
PWR
= 25 V to 30 V. Resumes normal operation with proper voltage. All outputs
assuming the previous state upon recovery from overvoltage.
Overtemperature
Only the output experiencing an overtemperature fault shuts down. Output assumes previous state upon
recovery from overtemperature.
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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