MCP3424T-ESLASHMF datasheet(35/58 Pages) MICROCHIP

35 / 58 page

DS22088C-page 35

MCP3422/3/4

Equation 6-2 shows an example of calculating the

expected number of output code with various PGA gain

settings for Type K thermocouple output.

EQUATION 6-2:

EXPECTED NUMBER OF

OUTPUT CODE FOR TYPE

K THERMOCOUPLE

FIGURE 6-7:

Example of Pressure and Temperature Measurement.

Figure 6-7 shows an example of measuring both

pressure and temperature. The pressure is measured

by using NPP 301 (manufactured by GE NovaSensor),

and temperature is measured by a thermistor.

The pressure sensor output is 20 mV/V. This gives

100 mV of full scale output for VDD of 5V (sensor

excitation voltage). Equation 6-3 shows an example of

calculating the number of output code for the full scale

output of the NPP301.

log

50 mV

15.625

μV

PGA

------------------------

⎝⎠

⎜⎟

⎛⎞

= 11.6 bits for PGA = 1

= 12.6 bits for PGA = 2

= 13.6 bits for PGA = 4

= 14.6 bits for PGA = 8

Expected

Number of Output Code =

Where:

1 LSB

15.625 µV with 18 Bit configuration.

VDD

CH2-

VSS

CH3+

Adr1

Adr0

CH2+

CH3-

CH1-

CH4+

CH1+

CH4-

SDA

SCL

VDD

0.1 µF

10 µF

TO MCU

(MASTER)

VDD

Thermistor

VDD

Pressure Sensor

VDD

Thermistor

R1 and R2 = Voltage Divider

-------------------

(NPP301)

Pressure Sensor

(NPP301)

VIN

MCP3424

MCP3424T-E/MF 数据表(PDF) 35 Page - Microchip Technology

MCP3424T-E/MF 数据表(HTML) 35 Page - Microchip Technology

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58

数据表下载