bykkkkkk

BYK_Colour_Sensor/docs/notes

@@ -0,0 +1,103 @@
+auto match III spectrophotometer
+
+
+
+68000 based micro
+
+ two board construction
+
+
+
+sensor board + main CPU board
+
+
+sensor board has leds soldered on all edges of board
+slight nuisance to repair
+
+must cut all then resolder
+
+ics
+Colour Board:
+Maxim187ACWE x 2  ADC w/4.096 reference (see resources for why this is used)(SPI)
+X77K  (LED drivers) x 5
+LT1152 x 2 (op amps connected between adc and) 
+LT0412 x 1 (can't find data sheet on this one)
+X9241A Renesas digital Potentiometer x 1 (I2C)
+OPT301M (Burr Brown / TI).
+
+
+VDD is 5V+ (colour board)
+There is a VREG, and some drivers that are only used for the leds, the 74 series
+logic is also for the leds
+
+
+the FFC connector on bottom of colour board.
+Starting at pin 1, with ffc coming towards you
+
+1
+2
+3 GND
+4 VDD
+5
+6
+7
+8 CS
+9
+10
+11 SCLK2
+12 SCLK1
+13 DOUT1
+14 DOUT2
+
+CS are common to both MAX187,
+These numbers (DOUT1,2 SCLK1,2 should be double checked. I think they are wrong.)
+Note that they have ONE CS, and TWO DO. So instead of selecting chip via
+the different CS, they simply read both DO at the same time.
+I didn't know you could do this. However, it comes at the expense of separate
+SCLK lines, which they had to put on the FFC.
+
+
+Both DOUT are held high by R next to each MAX187
+
+
+
+Pinout of Colour Sensor EDIT: I found the data sheet, skip to the next pinout 
+(going clockwise with notch as #1, with the pins facing towards you)
+1 GND
+2 5V/VDD
+3
+4
+5
+6
+7
+8
+
+(with pins below you, top of sensor facing you)(counter clockwise, 1 is one left of notch)
+FROM DATASHEET
+1 5V+
+2 In - 
+3 V- 
+4 1M ohm Feedback
+5 Output    (Goes into 0 ohm resistor, then into LT1152 Op Amp on right side)
+6 n/c
+7 n/c
+8 GND (notch)
+
+
+LT1154 output to MAX187 adc. 
+One (inverting?) Input is from Renesas Digital Pot.
+X9241AUS is four 50K.
+
+No one is really using the X9241 online.
+
+http://www.combustory.com/wiki/index.php/Temperature_Controller
+
+
+The digital pot looks to be to tune the Feedback R of the OPT301. Pin 4. I think...
+
+Could just hack a 50K resistor in there somewhere probably. It has an internal
+1M ohm resistor...
+
+
+
+