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MCP3421 数据表(PDF) 14 Page - Microchip Technology

部件名 MCP3421
功能描述  18-Bit Analog-to-Digital Converter with I2C Interface and On-Board Reference
PDF  42 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP3421 数据表(HTML) 14 Page - Microchip Technology

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MCP3421
DS22003E-page 14
© 2009 Microchip Technology Inc.
4.9.2
CONVERTING THE DEVICE
OUTPUT CODE TO INPUT SIGNAL
VOLTAGE
When the user gets the digital output codes from the
device as described in
Section 4.9.1 “Digital output
code from device”, the next step is converting the
digital output codes to a measured input voltage.
Equation 4-4 shows an example of converting the
output codes to its corresponding input voltage.
If the sign indicator bit (MSB) is ‘0’, the input voltage
is obtained by multiplying the output code with the LSB
and divided by the PGA setting.
If the sign indicator bit (MSB) is ‘1’, the output code
needs to be converted to two’s complement before
multiplied by LSB and divided by the PGA setting.
Table 4-4 shows an example of converting the device
output codes to input voltage.
EQUATION 4-4:
CONVERTING OUTPUT
CODES TO INPUT
VOLTAGE
TABLE 4-4:
EXAMPLE OF CONVERTING OUTPUT CODE TO VOLTAGE (WITH 18 BIT SETTING)
If MSB = 0 (Positive Output Code):
If MSB = 1 (Negative Output Code):
Where:
LSB
=
See Table 4-1
2’s complement
=
1’s complement + 1
Input Voltage
(Output Code)
LSB
PGA
------------
•
=
Input Voltage
(2
′s complement of Output Code)
LSB
PGA
------------
•
=
Input Voltage
[VIN+-VIN-] • PGA]
Digital Output Code
MSB
(sign bit)
Example of Converting Output Codes to Input Voltage
≥ V
REF
011111111111111111
0
(2
16+215+214+213+212+211+210+29+28+27+26+25+24+23+22+
2
1+20)x LSB(15.625
μV)/PGA = 2.048 (V) for PGA = 1
VREF - 1 LSB
011111111111111111
0
(2
16+215+214+213+212+211+210+29+28+27+26+25+24+23+22+
2
1+20)x LSB(15.625
μV)/PGA = 2.048 (V) for PGA = 1
2LSB
000000000000000010
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x
LSB(15.625
μV)/PGA = 31.25 (μV) for PGA = 1
1LSB
000000000000000001
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x
LSB(15.625
μV)/PGA = 15.625 (μV)for PGA = 1
0
000000000000000000
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0)x
LSB(15.625
μV)/PGA = 0 V (V) for PGA = 1
-1 LSB
111111111111111111
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x
LSB(15.625
μV)/PGA = - 15.625 (μV)for PGA = 1
-2 LSB
111111111111111110
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x
LSB(15.625
μV)/PGA = - 31.25 (μV)for PGA = 1
- VREF
100000000000000000
1
-(2
17+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x
LSB(15.625
μV)/PGA = - 2.048 (V) for PGA = 1
≤ -V
REF
100000000000000000
1
-(2
17+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x
LSB(15.625
μV)/PGA = - 2.048 (V) for PGA = 1



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