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| 型號： | MCP3427-E/MF |
| 廠商： | Microchip Technology |
| 文件頁數(shù)： | 8/56頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 16BIT I2C PROGBL 10-DFN |
| 產(chǎn)品培訓(xùn)模塊： | MCP3901 Analog Front End |
| 標(biāo)準(zhǔn)包裝： | 120 |
| 位數(shù)： | 16 |
| 采樣率（每秒）： | 15 |
| 數(shù)據(jù)接口： | I²C，串行 |
| 轉(zhuǎn)換器數(shù)目： | 1 |
| 電壓電源： | 單電源 |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 10-VFDFN 裸露焊盤 |
| 供應(yīng)商設(shè)備封裝： | 10-DFN-EP（3x3） |
| 包裝： | 管件 |
| 輸入數(shù)目和類型： | 2 個差分，單極 |
| 產(chǎn)品目錄頁面： | 672 (CN2011-ZH PDF) |
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MCP3426/7/8
DS22226A-page 16
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 16 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
[CHn+ - CHn-]
PGA]
Digital Output Code
MSB
Example of Converting Output Codes to Input Voltage
≥ V
REF
0111111111111111
0
(2
14+213+212+211+210+29+28+27+26+25+24+23+22+21+20)x
LSB(62.5
μV)/PGA = 2.048 (V) for PGA = 1
VREF - 1 LSB
0111111111111111
0
(2
14+213+212+211+210+29+28+27+26+25+24+23+22+21+20)x
LSB(62.5
μV)/PGA = 2.048 (V) for PGA = 1
2LSB
0000000000000010
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x LSB(62.5
μV)/PGA
= 125
(μV) for PGA = 1
1LSB
0000000000000001
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x LSB(62.5
μV)/PGA
= 62.5 (
μV)for PGA = 1
0
0000000000000000
0
(0+0+0+0+0+0+0+0+0+0+0+0+0+0+0)x LSB(62.5
μV)/PGA
= 0 V (V) for PGA = 1
-1 LSB
1111111111111111
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+0+2
0)x LSB(62.5
μV)/
PGA = - 62.5 (
μV)for PGA = 1
-2 LSB
1111111111111110
1
-(0+0+0+0+0+0+0+0+0+0+0+0+0+2
1+0)x LSB(62.5
μV)/
PGA = - 125 (
μV)for PGA = 1
- VREF
1000000000000000
1
-(2
15+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x LSB(62.5
μV)/
PGA = - 2.048 (V) for PGA = 1
≤ -V
REF
1000000000000000
1
-(2
15+0+0+0+0+0+0+0+0+0+0+0+0+0+0) x LSB(62.5
μV)/
PGA = - 2.048 (V) for PGA = 1
Note:
MSB = sign bit (1: “-”, 0: “+”)
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