參數(shù)資料
型號： mcp3204
廠商： Microchip Technology Inc.
元件分類： 串行ADC
英文描述： 2.7V 4-Channel/8-Channel 12-Bit A/D Converters With SPI Serial Interface(SPI串行接口的4通道12位A/D轉換器)
中文描述： 2.7 4-Channel/8-Channel 12位A / D轉換器具有SPI串行接口（SPI串行接口的4通道12位的A / D轉換器）
文件頁數(shù)： 17/34頁
文件大小： 673K
代理商： MCP3204
2002 Microchip Technology Inc.
DS21298C-page 17
MCP3204/3208
6.0
APPLICATIONS INFORMATION
6.1
Using the MCP3204/3208 with
Microcontroller (MCU) SPI Ports
With most microcontroller SPI ports, it is required to
send groups of eight bits. It is also required that the
microcontroller SPI port be configured to clock out data
on the falling edge of clock and latch data in on the ris-
ing edge. Because communication with the MCP3204/
3208 devices may not need multiples of eight clocks, it
will be necessary to provide more clocks than are
required. This is usually done by sending ‘leading
zeros’ before the start bit. As an example, Figure 6-1
and Figure 6-2 illustrate how the MCP3204/3208 can
be interfaced to a MCU with a hardware SPI port.
Figure 6-1 depicts the operation shown in SPI Mode
0,0, which requires that the SCLK from the MCU idles
in the ‘low’ state, while Figure 6-2 shows the similar
case of SPI Mode 1,1, where the clock idles in the ‘high’
state.
As is shown in Figure 6-1, the first byte transmitted to
the A/D converter contains five leading zeros before
the start bit. Arranging the leading zeros this way
allows the output 12 bits to fall in positions easily
manipulated by the MCU. The MSB is clocked out of
the A/D converter on the falling edge of clock number
12. Once the second eight clocks have been sent to the
device, the MCU’s receive buffer will contain three
unknown bits (the output is at high impedance for the
first two clocks), the null bit and the highest order four
bits of the conversion. Once the third byte has been
sent to the device, the receive register will contain the
lowest order eight bits of the conversion results.
Employing this method ensures simpler manipulation
of the converted data.
Figure 6-2 shows the same thing in SPI Mode 1,1,
which requires that the clock idles in the high state. As
with mode 0,0, the A/D converter outputs data on the
falling edge of the clock and the MCU latches data from
the A/D converter in on the rising edge of the clock.
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相關代理商/技術參數(shù)
參數(shù)描述
MCP3204_07 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI⑩ Serial Interface
MCP3204_08 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI Serial Interface
MCP3204-BI/P 功能描述:模數(shù)轉換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3204-BI/SL 功能描述:模數(shù)轉換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結構:Sigma-Delta 轉換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-32
MCP3204-BI/ST 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI⑩ Serial Interface
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