参数资料
型号: MC33972
厂商: 飞思卡尔半导体(中国)有限公司
英文描述: Multiple Switch Detection Interface with Suppressed Wake-Up(带抑制唤醒功能的多开关检测接口)
中文描述: 多交换检测接口,具有抑制唤醒(带抑制唤醒功能的多开关检测接口)
文件页数: 11/28页
文件大小: 819K
代理商: MC33972
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33972/D
11
MCU INTERFACE DESCRIPTION
The 33972 device directly interfaces to a 3.3 V or 5.0 V
microcontroller unit (MCU). SPI serial clock frequencies up to
6.0 MHz may be used for programming and reading switch
input status (production tested at 4.16 MHz).
Figure 5
illustrates
the configuration between an MCU and one 33972.
Serial peripheral interface (SPI) data is sent to the 33972
device through the SI input pin. As data is being clocked into the
SI pin, status information is being clocked out of the device by
the SO output pin. The response to a SPI command will always
return the switch status, interrupt flag, and thermal flag. Input
switch states are latched into the SO register on the falling edge
of the chip select (
CS
) pin. Twenty-four bits are required to
complete a transfer of information between the 33972 and the
MCU.
Figure 5. SPI Interface with Microprocessor
Two or more 33972 devices may be used in a module
system. Multiple ICs may be SPI-configured in parallel or serial.
Figures 6
and
7
show the configurations. When using the serial
configuration, 48-clock cycles are required to transfer data in/
out of the ICs.
Figure 6. SPI Parallel Interface with Microprocessor
Figure 7. SPI Serial Interface with Microprocessor
33972
MC68HCXX
Microcontroller
Receive
Buffer
Parallel
Ports
To Logic
24-Bit Shift Register
Shift Register
MOSI
SI
MISO
SO
SCLK
CS
INT
INT
Parallel
Ports
MC68HCXX
Microcontroller
33972
33972
SI
SCLK
CS
INT
SI
SO
SCLK
CS
INT
INT
SCLK
MISO
MOSI
Shift Register
SO
Parallel
Ports
MC68HCXX
Microcontroller
33972
33972
SI
SCLK
CS
INT
SI
SO
SCLK
CS
INT
SO
INT
SCLK
MISO
MOSI
Shift Register
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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