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參數資料
| 型號： | MCP3551E |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | SENSOR COMP LOAD CELL 2LBF |
| 中文描述： | 低功耗，單通道22位Δ-Σ模數轉換器 |
| 文件頁數： | 16/30頁 |
| 文件大?。?/td> | 616K |
| 代理商： | MCP3551E |
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MCP3551/3
DS21950B-page 16
2005 Microchip Technology Inc.
5.0
SERIAL INTERFACE
5.1
Overview
Serial communication between the microcontroller and
the MCP3551/3 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 inter-
nal 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 conver-
sion 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
V
IN
> V
REF
- 1 LSB, OVH toggles to logic ‘
1
’, detecting
an overflow high in the analog input voltage.
Bit 23 is Overflow Low (OVL) when V
IN
< -V
REF
, 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 represent 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
High
(OVH)
when
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 -V
REF
and
V
REF
- 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
V
REF
(at room temperature), meaning that the modula-
tor will still give accurate output codes with an over-
range of 12% below or above the reference voltage.
Unlike the usual 22-bit device, the 22-bit output 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:
Analog Input Voltages.
Typical Serial Device Communication and Example Digital Output Codes for Specific
CS
SCK
D
R
L
16
15 14 13 12 11 10 9
8
7 6
5
4 3
2
1
0
READY
HI-Z
SDO/RDY
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| MCP3551-E/MS | 功能描述:模數轉換器 - ADC 22-bit ADC 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 |
| MCP3551-E/SN | 功能描述:模數轉換器 - ADC 22-bit ADC 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 |
| MCP3551-ESN | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs |
| MCP3551T | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:Low-Power, Single-Channel 22-Bit Delta-Sigma ADCs |
| MCP3551T-50I/MS | 功能描述:模數轉換器 - ADC 13-bit Diff In 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 |
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