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参数资料
| 型号： | PC33999EK |
| 厂商： | Motorola, Inc. |
| 英文描述： | 16-Output Switch with SPI and PWM Control |
| 中文描述： | 16 - SPI和输出的PWM控制开关 |
| 文件页数： | 13/16页 |
| 文件大小： | 627K |
| 代理商： | PC33999EK |
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33999
13
FAULT OPERATION
On each SPI communication, a 24-bit command word is sent
to the 33999 and a 24-bit fault word is received from the 33999.
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
APPLICATIONS
Power Consumption
The 33999 is designed with one Sleep mode and one
Operational mode. In Sleep mode (SO
PWR
≤
2.0 V), the current
consumed by the VPWR pin is less than 50
μ
A.To place the
33999 in Sleep mode, turn all outputs OFF and remove power
from the SOPWR pin. During normal operation, 500
μ
A is
drawn from the SO
PWR
supply and 8.0 mA from the V
PWR
supply.
Paralleling of Outputs
Using MOSFETs as output switches allows the connection
of any combination of outputs together. The R
DS(ON)
of
MOSFETs has an inherent positive temperature coefficient
providing balanced current sharing between outputs without
destructive operation. 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 Output Current Limit increases
correspondingly. Output OFF Open Load Detect current may
increase based on how the Output OFF Open Load Detect is
programmed. Paralleling outputs from two or more different IC
devices is possible but not recommended.
Care must be taken when paralleling outputs for inductive
loads. The Output Voltage Clamp of the output drivers may not
match. One MOSFET output must be capable of the inductive
energy from the load turn OFF.
SPI Integrity Check
Checking the integrity of the SPI communication is
recommended upon initial power-up of the SOPWR pin. After
initial system startup or reset, the MCU writes one 48-bit
pattern to the 33999.
The first 24 bits read by the MCU is the fault status of the
outputs, while the second 24 bits is the first bit pattern sent. By
the MCU receiving the same bit pattern it sent, bus integrity is
confirmed. Please note the second 24 bits the MCU sends to
the 33999 are the command bits to program registers or
activate outputs on the rising edge of
CS
.
Output OFF Open Load Fault
An Output OFF Open Load Fault is the detection and
reporting of an
open
load when the corresponding output is
disabled (input bit programmed to a logic low state). The
Output OFF Open Load Fault is detected by comparing the
drain-to-source voltage of the specific MOSFET output to an
internally generated reference. Each output has one dedicated
comparator for this purpose.
Table 2. Fault Operation
Serial Output (SO) Pin Reports
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
Total device shutdown at V
PWR
= 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.
Overtemperature
Only the output experiencing an overtemperature shuts down. Output may auto-retry or remain OFF according
to the control bits in the Global Shutdown/Retry Control register.
Overcurrent
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 overtemperature shutdown. Output will operate as programmed in the Global Shutdown/Retry
Control register. Fault flag in SO Response word will be set.
F
Freescale Semiconductor, Inc.
Go to: www.freescale.com
n
.
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相关代理商/技术参数 |
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|---|---|
| PC33999EK/R2 | 制造商:MOTOROLA 制造商全称:Motorola, Inc 功能描述:16-Output Switch with SPI and PWM Control |
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