MCP3424EV Microchip Technology, MCP3424EV Datasheet - Page 29

• Manufacturer Part Number: MCP3424EV
• Description: EVALUATION BOARD FOR MCP3424
• Manufacturer: Microchip Technology

Specifications of MCP3424EV

• Number Of Adc's: 1
• Number Of Bits: 18
• Sampling Rate (per Second): 3.75 ~ 240
• Data Interface: I²C
• Inputs Per Adc: 4 Differential
• Input Range: ±2.048 V
• Power (typ) @ Conditions: 135µA @ 240sps
• Voltage Supply Source: Single Supply
• Operating Temperature: -55°C ~ 125°C
• Utilized Ic / Part: MCP3424
• Processor To Be Evaluated: MCP3424
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant, Lead free / RoHS Compliant

6.2
The MCP3424 device can be used for broad ranges of
sensor and data acquisition applications.
FIGURE 6-5:
With Type K thermocouple, it can measure tempera-
ture 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.
get for sensor signal using the MCP3424 device with
18 bits and PGA = 8 settings. With this configuration,
the MCP3424 device 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.
© 2008 Microchip Technology Inc.
Thermocouple Sensor
Heat
Application Examples
Equation 6-1
MCP9800
MCP9800
Multichannel Thermocouple Applications.
shows the measurement bud-
Isothermal Block
SDA
SCL
SDA
SCL
0.1 µF
10 µF
1
2
3
4
5
6
7
SDA
5 kΩ
CH1+
CH1-
CH2+
V
SDA
CH2-
V
SS
DD
MCP3424
CH4+
CH3+
CH4-
CH3-
Adr1
Adr0
SCL
Figure
for multi-channel thermocouple temperature measure-
ment applications.
EQUATION 6-1:
Where:
Detectable Input Signal Level
Input Signal Level after gain of 8:
14
13
12
11
10
1 LSB
9
8
SCL
5 kΩ
No. of LSB/°C
6-5, shows an example of using the MCP3424
(MASTER)
T
O
V
MCU
V
=
DD
DD
15.625 µV with 18 bit configuration
SDA
SDA
=
Isothermal Block
=
SCL
320
------------------------ -
15.625
MCP9800
MCP9800
=
(
SCL
40
1.953125μV for PGA
μ
V/°C
μ
V/°C
μ
MCP3424
=
V
15.625
=
) 8
•
20.48 Bits/°C
DS22088A-page 29
=
μ
V/PGA
320
μ
V/°C
=
8