Datasheet > AN897

AN897

更新时间： 2024-09-17 03:18:51

品牌	Logo	应用领域
美国微芯 - MICROCHIP		温度传感
页数	文件大小	规格书
16页	430K
描述
Thermistor Temperature Sensing with MCP6SX2 PGAs

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AN897 数据手册

AN897

The Signal Analysis PC Program commands the

PIC16F684 firmware to perform a real-time sample.

The firmware reads the ADC value and passes it to the

PGA hysteresis routine. Figure 16 shows the detail of

the PGA hysteresis routine. The routine checks to see

what PGA gain is set (the variable “PGAgain”). Based

on PGAgain, the ADC value is tested for end-point

(trip) values. If the ADC value is beyond the trip point

value, PGAgain is set to the next higher or lower gain

setting. Upon exiting the PGA hysteresis routine, the

firmware checks if PGAgain was changed. If there was

no change (Return 0), the program continues. If there

was a change (Return 1), the firmware re-reads the

ADC.

FLOWCHARTS

The second design’s flowchart is shown in Figure 15. It

is very similar to the first design program, with the

exception that it has added a PGA hysteresis routine.

The firmware is available in the 00897.zip file. The

firmware was written in relocatable assembly code.

The main.asm file controls the overall program flow.

The PGA routines are in pga.inc and pga.asm. The

thermistor routines are in Therm_PGA2.inc and

Therm_PGA2.asm.

Start

Get Real Time Sample

Once the PGA gain and ADC value are known, both

values are passed to the piece-wise linear interpolation

routine. Based on the PGA gain setting, the correct

look-up table is referenced. The PwLI routine converts

the 10-bit ADC value into a 16-bit fixed decimal point

degrees Celsius value. The fixed decimal point format

reports degrees Celsius in tenths of a degree.

Performing the piece-wise linear interpolation in tenths

of a degree provides better resolution of degrees

Celsius. Finally, the 16-bit degrees Celsius value is

sent to the Signal Analysis PC Program for display on

the real-time strip chart graph.

Read ADC

PGA Hysteresis

Was PGAgain

Changed?

Yes

Perform PwLI

In the final design, the designer can elect to receive

reports in tenths of a degree or that they be rounded up

into whole degrees.

Send °C to Strip Chart

End

FIGURE 15:

Flowchart for Second

Design.

PGA Hysteresis

PGAadc < 113

PGAgain = 1

Set PGAgain = 8

PGAadc < 226

PGAgain = 8

Set PGAgain = 32

Set PGAgain = 1

PGAadc > 960

PGAgain = 32

PGAadc > 960

Set PGAgain = 8

Return 0

Return 1

FIGURE 16:

Flowchart for Second Design’s PGA Hysteresis Subroutine.

DS00897B-page 6

 2004 Microchip Technology Inc.

1...3 4 567 8 9...16

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