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參數資料
| 型號： | MCP3204-CIST |
| 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 |
| 中文描述： | 2.7 4-Channel/8-Channel 12位A / D轉換器具有SPI串行接口 |
| 文件頁數： | 14/20頁 |
| 文件大?。?/td> | 425K |
| 代理商： | MCP3204-CIST |
MCP3204/3208
DS21298B-page 14
Preliminary
1999 Microchip Technology Inc.
5.0
SERIAL COMMUNICATIONS
Communication with the MCP3204/3208 devices is
done using a standard SPI-compatible serial interface.
Initiating communication with either device is done by
bringing the CS line low. See Figure 5-1. If the device
was powered up with the CS pin low, it must be brought
high and back low to initiate communication. The first
clock received with CS low and D
high will constitute
a start bit. The SGL/DIFF bit follows the start bit and will
determine if the conversion will be done using single
ended or differential input mode. The next three bits
(D0, D1 and D2) are used to select the input channel
configuration. Table 5-1 and Table 5-2 show the config-
uration bits for the MCP3204 and MCP3208, respec-
tively. The device will begin to sample the analog input
on the fourth rising edge of the clock after the start bit
has been received. The sample period will end on the
falling edge of the fifth clock following the start bit.
After the D0 bit is input, one more clock is required to
complete the sample and hold period (D
is a don’t
care for this clock). On the falling edge of the next clock,
the device will output a low null bit. The next 12 clocks
will output the result of the conversion with MSB first as
shown in Figure 5-1. Data is always output from the
device on the falling edge of the clock. If all 12 data bits
have been transmitted and the device continues to
receive clocks while the CS is held low, the device will
output the conversion result LSB first as shown in
Figure 5-2. If more clocks are provided to the device
while CS is still low (after the LSB first data has been
transmitted), the device will clock out zeros indefinitely.
If necessary, it is possible to bring CS low and clock in
leading zeros on the D
line before the start bit. This is
often done when dealing with microcontroller-based
SPI ports that must send 8 bits at a time. Refer to
Section 6.1
for
more
MCP3204/3208 devices with hardware SPI ports.
details
on
using
the
CONTROL BIT
SELECTIONS
INPUT
CONFIGURATION
CHANNEL
SELECTION
SINGLE/
DIFF
D2*
D1
D0
1
1
1
1
0
X
X
X
X
X
0
0
1
1
0
0
1
0
1
0
single ended
single ended
single ended
single ended
differential
CH0
CH1
CH2
CH3
CH0 = IN+
CH1 = IN-
CH0 = IN-
CH1 = IN+
CH2 = IN+
CH3 = IN-
CH2 = IN-
CH3 = IN+
0
X
0
1
differential
0
X
1
0
differential
0
X
1
1
differential
*D2 is don’t care for MCP3204
TABLE 5-1:
Configuration Bits for the MCP3204.
CONTROL BIT
SELECTIONS
INPUT
CONFIGURATION
CHANNEL
SELECTION
SINGLE/
DIFF
D2
D1
D0
1
1
1
1
1
1
1
1
0
0
0
0
0
1
1
1
1
0
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
0
single ended
single ended
single ended
single ended
single ended
single ended
single ended
single ended
differential
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH0 = IN+
CH1 = IN-
CH0 = IN-
CH1 = IN+
CH2 = IN+
CH3 = IN-
CH2 = IN-
CH3 = IN+
CH4 = IN+
CH5 = IN-
CH4 = IN-
CH5 = IN+
CH6 = IN+
CH7 = IN-
CH6 = IN-
CH7 = IN+
0
0
0
1
differential
0
0
1
0
differential
0
0
1
1
differential
0
1
0
0
differential
0
1
0
1
differential
0
1
1
0
differential
0
1
1
1
differential
TABLE 5-2:
Configuration Bits for the MCP3208.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MCP3204T | 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 |
| MCP3204T-BI/P | 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 |
| MCP3204T-BI/SL | 功能描述:模數轉換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數量: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 |
| MCP3204T-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 |
| MCP3204T-CI/P | 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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