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参数资料
| 型号： | KIT33996EKEVB |
| 厂商： | Freescale Semiconductor |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | KIT EVAL 33996 16OUTPUT SW W/SPI |
| 标准包装： | 1 |
| 主要目的： | 电源管理，低端驱动器（内部 FET） |
| 嵌入式： | 否 |
| 已用 IC / 零件： | MC33996 |
| 主要属性： | 16 输出，5 ~ 27V，0.9 ~ 2.5A，SPI 接口，PWM 接口 |
| 次要属性： | 0.55 欧 RdsON，温度，过压，短路保护 |
| 已供物品： | 板，CD |
| 相关产品： | MC33996EK-ND - IC SWITCH 16OUTPUT W/SPI 32-SOIC MC33996EKR2-ND - IC SWITCH 16-OTPT W/SPI 32-SOIC |
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
Table 5. Fault Operation
Serial Output (SO) Pins Reports
Over-temperature
Over-current
Output “ON’ Open Load Fault
Output “OFF’” Open Load Fault
Device Shutdowns
Over-voltage
Over-temperature
Over-current
Fault reported by Serial Output (SO) pin.
SO pin reports short to battery/supply or over-current condition.
Not reported.
SO pin reports output “OFF’” open load condition.
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.
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.
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.
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
Figure 9 shows the basic SPI configuration between an
MCU and one 33996.
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
MC68HCXX
Microcontroller
MOSI
SI
33996
Peripheral Interface (SPI) for control and diagnostic readout.
Shift Register
MISO
SO
24-Bit Shift Register
SCLK
Receive
Buffer
Parallel
Ports
RST
CS
PWM
To Logic
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.
33996
Analog Integrated Circuit Device Data
Freescale Semiconductor
11
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