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| 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(zhuǎn)換器) |
| 中文描述： | 2.7 4-Channel/8-Channel 12位A / D轉(zhuǎn)換器具有SPI串行接口（SPI串行接口的4通道12位的A / D轉(zhuǎn)換器） |
| 文件頁數(shù)： | 15/34頁 |
| 文件大小： | 673K |
| 代理商： | MCP3204 |
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2002 Microchip Technology Inc.
DS21298C-page 15
MCP3204/3208
5.0
SERIAL COMMUNICATIONS
Communication with the MCP3204/3208 devices is
accomplished 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
IN
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 configuration bits for the MCP3204 and MCP3208,
respectively. The device will begin to sample the ana-
log 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.
Once the D0 bit is input, one more clock is required to
complete the sample and hold period (D
IN
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
IN
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 details on using the MCP3204/
3208 devices with hardware SPI ports.
TABLE 5-1:
CONFIGURATION BITS FOR
THE MCP3204
TABLE 5-2:
CONFIGURATION BITS FOR
THE MCP3208
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 a “don’t care” for 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
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
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| MCP3204-BI/P | 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 12-bit SPI 4 Chl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32 |
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