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ELECTRICAL CHARACTERISTICS
MICROCONTROLLER PARAMETRICS
MICROCONTROLLER PARAMETRICS
SPI - MCU INTERFACE DESCRIPTION
The 33811 device directly interfaces to a 3.3V or 5.0V
micro controller unit (MCU) using 16 bit Serial Peripheral
Interface (SPI) protocol. SPI serial clock frequencies up to
3.2MHz may be used when programming and reading output
Microcontroller
MOSI
SI
33811
status information (production tested at 3.2MHz). Figure 5
illustrates the serial peripheral interface (SPI) configuration
Shift Register
MISO
SO
16-Bit Shift Register
between an MCU and one 33811.
Command data is sent to the 33811 device through the SI
input pin. As data is being clocked into the SI pin, status
SCLK
information is being clocked out of the device by the SO
output pin. The response data received by the MCU during
SPI communication depends on the previous SPI message
sent to the device. Next SO response data is listed at the
Receive
Buffer
Parallel
Ports
CS
Fault Bits
bottom of each command table.
SPI Integrity Check
Checking the integrity of the SPI communication with the
initial power-up of the VDD and RESET pins is
recommended. After initial system start-up or reset, the MCU
will write one 16-bit pattern to the 33811. The first 8 bits read
by the MCU will be the fault status (SO message 1) of the
outputs. The second 8 bits will be the same bit pattern sent
Figure 5. SPI Interface with Microprocessor
Two or more 33811 devices may be used in a module
system. Multiple ICs may be SPI-configured in parallel or
serial. Figures 6 shows the configurations. When using the
serial configuration, 32-clock cycles are required to transfer
data in / out of the ICs.
by the MCU. By the MCU receiving the same bit pattern it
sent, bus integrity is confirmed. The second 16-bit pattern the
MCU sends to the device is the a command word and will be
operated on by the device accordingly on rising edge of CS .
Important A SCLK pulse count strategy has been
implemented to ensure integrity of SPI communications. SPI
messages consisting of 16 SCLK pulses and multiples of
Microcontroller
Shift Register
Parallel
Ports
MOSI
MISO
SCLK
SI
SO
SCLK
CS
33811
8 clock pulses thereafter will be acknowledged. SPI
messages consisting of other than 16 + multiples of 8 SCLK
pulses will be ignored by the device.
33811
SI
SO
SCLK
CS
Figure 6. SPI Parallel Interface with Microprocessor
33811
Analog Integrated Circuit Device Data
10
Freescale Semiconductor
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相关PDF资料
KIT33812ECUEVME KIT DESIGN FOR 33812/S12P
KIT33812EKEVBE BOARD EVALUATION FOR MC33812
KIT33879AEKEVBE BOARD EVALUATION FOR MC33879
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KIT33886DHEVB KIT EVAL FOR MC33886 H-BRIDGE
KIT33887EKEVBE BOARD EVALUATION FOR MC33887
KIT33887PNBEVB KIT EVAL 33887 5A H-BRIDGE PQFN
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相关代理商/技术参数
KIT33812ECUEVME 功能描述:电源管理IC开发工具 SINGLE CYL S12 ENG CONTR RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
KIT33812ECUEVME 制造商:Freescale Semiconductor 功能描述:Small Engine Control Reference Design
KIT33812EKEVBE 功能描述:电源管理IC开发工具 INTEGRATED DUAL LOW & HI RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
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KIT33879AEKEVBE 功能描述:电源管理IC开发工具 CONFIGURABLE OCTAL RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
KIT33880DWBEVB 功能描述:电源管理IC开发工具 33880DWB COSS KIT RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V