参数资料
型号: MC33993
厂商: 飞思卡尔半导体(中国)有限公司
英文描述: Multiple Switch Detection Interface(多开关监测接口)
中文描述: 多交换检测接口(多开关监测接口)
文件页数: 11/28页
文件大小: 820K
代理商: MC33993
MOTOROLA ANALOG INTEGRATED CIRCUIT DEVICE DATA
33993/D
11
MCU INTERFACE DESCRIPTION
The 33993 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 33993.
Serial peripheral interface (SPI) data is sent to the 33993
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 33993 and the
MCU.
Figure 5. SPI Interface with Microprocessor
Two or more 33993 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
33993
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
33993
33993
SI
SCLK
CS
INT
SI
SO
SCLK
CS
INT
INT
SCLK
MISO
MOSI
Shift Register
SO
Parallel
Ports
MC68HCXX
Microcontroller
33993
33993
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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