參數(shù)資料
型號(hào)： MCP3553E
廠商： Microchip Technology Inc.
英文描述： Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
中文描述： 低功耗，單通道22位Δ-Σ模數(shù)轉(zhuǎn)換器
文件頁數(shù)： 19/30頁
文件大?。?/td> 616K
代理商： MCP3553E
2005 Microchip Technology Inc.
DS21950B-page 19
MCP3551/3
If 24 bits of data are required from this conversion, they
must be accessed during this communication. You can
terminate data transition by bringing CS high, but the
remaining data will be lost and the converter will go into
Shutdown mode. Once the data has been transmitted
by the converter, the SDO/RDY pin will remain in the
LSB state until the 25th falling edge of SCK. At this
point, SDO/RDY is released from the Data Acquisition
mode and changed to the RDY state.
5.4.2
2-WIRE CONTINUOUS
CONVERSION OPERATION,
(CS TIED PERMANENTLY LOW)
It is possible to use only two wires to communicate with
the MCP3551/3 devices. In this state, the device is
always in Continuous Conversion mode, with internal
conversions continuously occurring. This mode can be
entered by having CS low during power-up or changing
it to a low position after power-up. If CS is low at
power-up, the first conversion of the converter is
initiated approximately 300 μs after the power supply
has stabilized.
5.5
Using The MCP3551/3 with
Microcontroller (MCU) SPI Ports
It is required that the microcontroller SPI port be config-
ured to clock out data on the falling edge of clock and
latch data in on the rising edge. Figure 5-6 depicts the
operation shown in SPI mode 1,1 which requires that
the SCK from the MCU idles in the High state, while
Figure 5-7 shows the similar case of SPI Mode 0,0
where the clock idles in the Low state. The waveforms
in the figures are examples of an MCU operating the
SPI port in 8-bit mode, and the MCP3551/3 devices do
not require data in 8-bit groups.
In SPI mode 1,1, data is read using only 24 clocks or
three byte transfers. The data ready bit must be read
by testing the SDO/RDY line prior to a falling edge of
the clock.
In SPI mode 0,0, data is read using 25 clocks or four
byte transfers. Please note that the data ready bit is
included in the transfer as the first bit in this mode.
FIGURE 5-6:
SPI Communication – Mode 1,1.
Note:
The RDY state is not latched to CS in this
mode; the RDY flag dynamically updates
on the SDO/RDY pin and remains in this
state until data is clocked out using the
SCK pin.
CS
SCK
SDO/RDY
MCU
Receive
Buffer
Data stored into MCU receive
register after transmission of
first byte
Data stored into MCU receive
register after transmission of
second byte
Data stored into MCU receive
register after transmission of
third byte
D
R
O O21 20 19 18 17
16
15 14 13 12 11 10 9
8
7 6 5 4 3
2 1
0
OL OH 21 20 19 18 17 16
15 14 13 12 11 10 9
8
7
6
5
4
3
2
1
0
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP3553-E/MS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC 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
MCP3553-E/SN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC 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
MCP3553T 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs
MCP3553T-E/MS 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC 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
MCP3553T-E/SN 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 22-bit ADC 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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