描述

25. 樹莓派 Raspberry Pi I2C 18bit A/D 16 channel & I2C 23017 32 GPIO 擴充板

一、產品特色
1. The MCP3424 contains an on-board 2.048V reference voltage with aninput range of ±2.048V differentially (full scale range of 4.096V/PGA). Aprogrammable Gain Amplifier gives the user a selectable gain of x1, x2,x4 or x8 before the analogue to digital conversion takes place.

The data rate for analogue to digital conversions is 3.75 (18 bit), 15 (16
bit), 60 (14 bit) or 240 (12 bit) samples per second. Data rate and
resolution can be configured within software using the I2C interface.

2. J3 pin (1,3,5,7,9,11,13,15,17)

ch1+,ch2+,ch3+,ch4+,ch5+,ch6+,ch7+,ch8+,Vcc

3. J3 pin (2,4,6,8,10,12,14,16,18)

ch1-,ch2-,ch3-,ch4-,ch5-,ch6-,ch7-,ch8-GND

4. J4 pin (1,3,5,7,9,11,13,15,17)

ch9+,ch10+,ch11+,ch12+,ch13+,ch14+,ch15+,ch16+,Vcc

5. J4 pin (2,4,6,8,10,12,14,16,18)

ch9-,ch10-,ch11-,ch12-,ch13-,ch14-,ch15-,ch16-GND

6. J18 Rs-Pi V2  GPIO output

7. JP18  GA0 ~ GA7, GND, INTA   U13 Port A

JP19 GB0 ~ GB7, GND, INTB     U13 Port B

8. JP25  AA0 ~ AA7, GND,INTA   U14 Port A

JP24 BA0 ~ BA7,GND, INTB     U14 Port B

9. R61,R62,R63  ( for U13 Address select A0,A1,A2 )

10. R64,R65,R66 ( for  U14 Address select  A0,A1,A2)

11. JP1, POWER SELECT from Rasdpberry Pi (2-3) or  2P terminal block/Mini USB B (1-2)

12. U13 (21)  23017 -1  Port A,B      U14 (22)   23017-2 Port A,B   MCP23017 DataSheet

13.  U1 ~ U4 MCP3424      MCP3424    Datasheet 

MCP3424 U1 ~U4  –>   6c, 6d, 6e 6f

MCP23017  U13 U14  –> 21,22

二、範例程式下載

Scratch驅動應用範例 Detail

led-21.py

led-22.py

23017-21.py

23017-22.py

3424-4.py     16channel ADC

三、產品內容

1x Rs-Pi 18bit i2c 3424-4 & 16 channel A/D  23017-2  32 GPIO Board

1x User Manual