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| 型号： | TMPSNS-RTD1 |
| 厂商： | Microchip Technology |
| 文件页数： | 27/43页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL PT100 RTD TEMP SENSOR |
| 标准包装： | 1 |
| 传感器类型： | 温度 |
| 接口： | USB |
| 嵌入式： | 是，MCU，8 位 |
| 已供物品： | 板，缆线，CD |
| 已用 IC / 零件： | MCP3301，MCP6S26，PIC18F2550 |
| 产品目录页面： | 672 (CN2011-ZH PDF) |
| 相关产品： | MCP3301T-BI/SN-ND - IC ADC 13BIT 2.7V 1CH SPI 8-SOIC MCP3301-BI/SN-ND - IC ADC 13BIT 2.7V SPI 8-SOIC MCP3301T-CI/SN-ND - IC ADC 13BIT 2.7V 1CH SPI 8-SOIC MCP3301T-BI/MS-ND - IC ADC 13BIT 2.7V 1CH SPI 8-MSOP MCP3301T-CI/MS-ND - IC ADC 13BIT 2.7V 1CH SPI 8-MSOP MCP3301-BI/P-ND - IC ADC 13BIT 2.7V SPI 8-DIP MCP3301-BI/MS-ND - IC ADC 13BIT 2.7V SPI 8-MSOP MCP3301-CI/SN-ND - IC ADC 13BIT 2.7V 1CH SPI 8SOIC MCP3301-CI/P-ND - IC ADC 13BIT 2.7V 1CH SPI 8-DIP MCP3301-CI/MS-ND - IC ADC 13BIT 2.7V 1CH SPI 8-MSOP |
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MCP6S21/2/6/8
6.4.5
EXPANDED INPUT PGA
6.4.7
ADC DRIVER
up to 15 input channels. Obviously, Sensors #7-14
have a high total gain range available, as explained in
can be daisy chained (Section 5.3, “Daisy Chain
Configuration”).
The family of PGA’s is well suited for driving Analog-to-
Digital Converters (ADC). The binary gains (1, 2, 4, 8,
16 and 32) effectively add five more bits to the input
range (see Figure 6-10). This works well for applica-
tions needing relative accuracy more than absolute
accuracy (e.g., power monitoring).
Sensors
# 0-6
MCP6S28
V OUT
V IN
MCP6S28
Lowpass
Filter
MCP3201
12
OUT
Sensors
# 7-14
MCP6S28
FIGURE 6-10:
PGA as an ADC Driver.
FIGURE 6-8: PGA with Expanded Inputs.
6.4.6 PICmicro ? MCU WITH EXPANDED
INPUT CAPABILITY
to a PICmicro ? microcontroller. This greatly expands
the input capacity of the microcontroller, while adding
the ability to select the appropriate gain for each
source.
At low gains, the ADC’s Signal-to-Noise Ratio (SNR)
will dominate since the PGAs input noise voltage den-
sity is so low (10 nV/ √ Hz @ 10 kHz, typ.). At high gains,
the PGA’s noise will dominate the SNR, but its low
noise supports most applications. Again, these PGAs
add the flexibility of selecting the best gain for an
application.
The low pass filter in the block diagram reduces the
integrated noise at the MCP6S28’s output and serves
as an anti-aliasing filter. This filter may be designed
using Microchip’s FilterLab ? software, available at
www.microchip.com.
V IN
MCP6S28
PICmicro ?
Microcontroller
SPI?
FIGURE 6-9:
Expanded Input for a
PICmicro Microcontroller.
? 2003 Microchip Technology Inc.
DS21117A-page 27
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