Difference between revisions of "DIGIO-128 Rev X4 Assembly Sheet"

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* R6 pulls up A2 to Vcc (only if R7 is not installed) (64-bits only)
 
* R6 pulls up A2 to Vcc (only if R7 is not installed) (64-bits only)
 
* R7 provide pull-up or pull-down for I2C address A2 line
 
* R7 provide pull-up or pull-down for I2C address A2 line
 +
* R7 is 0 ohm jumper
 +
* R6 is 10K resistor
  
 
=== DIGIO-128 - 128-bit option ===
 
=== DIGIO-128 - 128-bit option ===

Revision as of 13:04, 12 February 2021

DIGIO-128-AssySheet-X4.PNG

Parts List

Qty Value RefDes Qty Value RefDes
8 0.1uF Cap, 0.2" pitch C1-C8 1 CONN, 2X03 J4
1 (option) 0 (wire) R7 (option - below) 2 CONN, 1x4 J2,J3
2

(3)

10K (1/4W) R1,R2
R6 (option - below)
1 CONN, 1x5 J1
1 1K (1/4W) R5 8 CONN, 2x10 P1,P2,P3,P4,P6,P7,P8,P9
2 2.2K (1/4W) R3,R4 2 CONN, 2X2 P10,P5
1 24LC024-I/P U9
8 MCP23017P U1,U2,U3,U4,U5,U6,U7,U8

R6/R7 Option

  • R6 and R7 can be used to shift the address of the 64 bit version of the card from 0x20-0x23 up to 0x24-0x27
  • R6 pulls up A2 to Vcc (only if R7 is not installed) (64-bits only)
  • R7 provide pull-up or pull-down for I2C address A2 line
  • R7 is 0 ohm jumper
  • R6 is 10K resistor

DIGIO-128 - 128-bit option

  • Leave R6 open (no resistor)
  • Install jumper wire into R7

DIGIO-64 - 64-bit option

  • Typical - for I2C address = 0x20-0x23 leave R6 open, install jumper wire into R7
  • For I2C address = 0x24-0x27 leave R7 open, install 10K resistor in R6
  • I2C chips get installed into top 4 locations