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MCP3422 数据表(PDF) 34 Page - Microchip Technology

部件名 MCP3422
功能描述  18-Bit, Multi-Channel ?誇 Analog-to-Digital Converter with I2C??Interface and On-Board Reference
PDF  58 Pages
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制造商  MICROCHIP [Microchip Technology]
网页  http://www.microchip.com
标志 MICROCHIP - Microchip Technology

MCP3422 数据表(HTML) 34 Page - Microchip Technology

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MCP3422/3/4
DS22088C-page 34
© 2009 Microchip Technology Inc.
Figure 6-6,
shows
an
example
of
using
the
MCP3424 for four-channel thermocouple temperature
measurement applications.
FIGURE 6-6:
Four-Channel Thermocouple Applications.
With
Type
K
thermocouple,
it
can
measure
temperature from 0°C to 1250°C degrees. The full
scale output range of the Type K thermocouple is
about 50 mV. This provides 40 µV/°C (= 50 mV/
1250°C) of measurement resolution. Equation 6-1
shows the measurement budget for sensor signal using
the
MCP3422/3/4
device
with
18 bits
and
PGA = 8 settings.
With
this
configuration,
the
MCP3424 can detect the input signal level as low as
approximately 2 µV. The internal PGA boosts the input
signal level eight times. The 40 µV/°C input from the
thermocouple is amplified internally to 320 µV/°C
before the conversion takes place. This results in
20.48 LSB/°C output codes. This means there are
about 20 LSB output codes (or about 4.32 bits) per 1°C
of change in temperature.
EQUATION 6-1:
5k
Ω
VDD
4
5
6
9
CH2-
VSS
CH3+
3
12
CH2+
CH3-
2
13
CH1-
CH4+
1
14
CH1+
CH4-
7
8
SDA
SCL
VDD
11
10
0.1 µF
10 µF
TO MCU
(MASTER)
MCP9800
MCP9800
MCP9800
MCP9800
Isothermal Block
Isothermal Block
Thermocouple Sensor
Heat
SCL
SDA
SDA
SCL
SDA
SCL
VDD
SDA
SCL
SDA
SCL
Adr1
Adr0
5k
Ω
MCP3424
Input Signal Level after gain of 8:
Where:
1 LSB
=
15.625 µV with 18 bit configuration
Detectable Input Signal Level
15.625
μV/PGA
=
1.953125
μV for PGA 8
=
=
40
μV/°C
() 8
320
μV/°C
=
•
=
No. of LSB/°C
320
μV/°C
15.625
μV
-------------------------
20.48 Codes/°C
==



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