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