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| 型号： | MCP3550T-60E/SN |
| 厂商： | Microchip Technology |
| 文件页数： | 14/36页 |
| 文件大小： | 0K |
| 描述： | IC ADC 22BIT 2.7V 1CH 8SOIC |
| 产品培训模块： | MCP3901 Analog Front End |
| 标准包装： | 3,300 |
| 位数： | 22 |
| 采样率（每秒）： | 15 |
| 数据接口： | 串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 单电源 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOICN |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，单极 |
| 配用： | MCP355XDV-MS1-ND - BOARD DEV SENSOR APP MCP355X MCP355XDM-TAS-ND - BOARD DEMO TINY APP SNSR MCP355X |
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2009 Microchip Technology Inc.
DS21950E-page 21
MCP3550/1/3
5.0
SERIAL INTERFACE
5.1
Overview
Serial communication between the microcontroller and
the MCP3550/1/3 devices is achieved using CS, SCK
and SDO/RDY. There are two modes of operation:
Single Conversion and Continuous Conversion. CS
controls the conversion start. There are 24 bits in the
data word: 22 bits of conversion data and two overflow
bits. The conversion process takes place via the
internal oscillator and the status of this conversion
must
be
detected.
The
typical
method
of
communication is shown in Figure 5-1. The status of
the internal conversion is the SDO/RDY pin and is
available with CS low. A High state on SDO/RDY
means the device is busy converting, while a Low
state means the conversion is finished and data is
ready for transfer using SCK. SDO/RDY remains in a
high-impedance state when CS is held high. CS must
be low when clocking out the data using SCK and
SDO/RDY.
Bit 22 is Overflow High (OVH) when VIN > VREF – 1 LSB,
OVH toggles to logic ‘1’, detecting an overflow high in
the analog input voltage.
Bit 23 is Overflow Low (OVL) when VIN < -VREF, OVL
toggles to logic ‘1’, detecting an overflow low in the
analog input voltage. The state OVH = OVL = ‘1’ is not
defined and should be considered as an interrupt for
the SPI interface meaning erroneous communication.
Bit 21 to bit 0 represents the output code in 22-bit
binary two's complement. Bit 21 is the sign bit and is
logic ‘0’ when the differential analog input is positive
and logic ‘1’ when the differential analog input is
negative. From Bit 20 to bit 0, the output code is given
MSb first (MSb is bit 20 and LSB is Bit 0). When the
analog input value is comprised between -VREF and
VREF – 1 LSB, the two overflow bits are set to logic ‘0’.
The relationship between input voltage and output
code is shown in Figure 5-1.
The delta-sigma modulator saturation point for the
differential analog input is located at around ±112% of
VREF (at room temperature), meaning that the
modulator will still give accurate output codes with an
overrange of 12% below or above the reference
voltage. Unlike the usual 22-bit device, the 22-bit out-
put code will not lock at 0x1FFFFF for positive sign
inputs or 0x200000 for negative sign inputs in order to
take advantage of the overrange capabilities of the
device. This can be practical for closed-loop
operations, for instance. In case of an overflow, the
output code becomes a 23-bit two's complement output
code, where the sign bit will be the OVL bit. If an
overflow high or low is detected, OVL (bit 23) becomes
the sign bit (instead of bit 21), the MSb is then bit 21
and the converter can be used as a 23-bit two's
complement code converter, with output code from bits
B21 to B0, and OVL as the sign bit. Figure 5-1
summarizes the output coding data format with or
without overflow high and low.
FIGURE 5-1:
Typical Serial Device Communication and Example Digital Output Codes for Specific
Analog Input Voltages.
CS
SCK
D
O O
21 20 19 18 17
16
15 14 13 12 11 10 9
8
76 5 4 3 21
0
READY
H
L
R
HI-Z
SDO/RDY
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP3551 | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs |
| MCP3551-50I/MS | 功能描述:模数转换器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3551-50I/SN | 功能描述:模数转换器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3551-60I/MS | 功能描述:模数转换器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MCP3551-60I/SN | 功能描述:模数转换器 - ADC 13-bit Diff In 4 Chl RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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