MCP3422 datasheet(36/58 Pages) MICROCHIP

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

Scroll/Zoom	100%

制造商	MICROCHIP [Microchip Technology]

网页	http://www.microchip.com

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36 / 58 page

MCP3422/3/4

DS22088C-page 36

EQUATION 6-3:

EXPECTED NUMBER OF

OUTPUT CODE FOR

NPP301 PRESSURE

SENSOR

The thermistor temperature sensor can measure the

temperature range from -100°C to 300°C. The

resistance of the thermistor sensor decreases as

temperature

increases

(negative

temperature

coefficient). As shown in Figure 6-7, the thermistor (R2)

forms a voltage divider with R1.

The thermistor sensor is simple to use and widely used

for the temperature measurement applications. It has

both linear and non-linear responses over temperature

range. R1 is used to adjust the linear region of interest

for measurement.

Expected

log

100 mV

15.625

μV

PGA

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

⎝⎠

⎜⎟

⎛⎞

= 12.64 bits for PGA = 1

= 13.64 bits for PGA = 2

= 14.64 bits for PGA = 4

= 15.64 bits for PGA = 8

Number of Output Code =

Where:

1 LSB

15.625 µV with 18 Bit configuration.

MCP3422 数据表(PDF) 36 Page - Microchip Technology

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