Changes between Initial Version and Version 1 of LaserRev2Firmware

Timestamp:

Nov 8, 2013, 10:17:53 AM (12 years ago)

Author:

Eric Hazen

Comment:

--

LaserRev2Firmware

@@ +1 @@
+Up to [[Laser_PC_Board_Designs]]
+
+= Firmware for Rev 2 Laser/TEC system =
+
+== I2C Bus ==
+
+Four-channel I2C DAC [http://cds.linear.com/docs/Datasheet/2635fb.pdf LTC2635]
+Address as follows by crate slot:
+
+{{{
+  Slot  I2C   Note
+  000   0x20  Slot 0 - default
+  001   0x24  Slot 1
+  010   0x44  Slot 2
+  011   0x60  Slot 3
+  100   0xa4  Slot 4
+  101   0xc0  Slot 5
+
+}}}
+I2C bus is common to all uC (and to backplane if R5, R6 on Laser/TEC board installed).
+
+=== uC Pinout ===
+
+uC on Laser/TEC is [http://www.atmel.com/Images/doc8272.pdf ATMEGA164A]
+
+ADC reference should be external (REFS1=REFS0=0)
+
+||''''Pin''' || '''Func''' || '''Name''' || '''Note''' ||
+||PA0/ADC0 || ADC || ISENSE || Current sense 0.5V = 1A (4.88mA/LSB) ||
+||PA1/ADC1 || ADC || THERM_LASER || Laser temperature ADC input (512 @ 25 deg C) ||
+||PA2/ADC2 || ADC || THERM_HOT || TEC hot side ADC input (512 at 25 deg C) ||
+||PA3/ADC3 || ADC || FAN_STATUS || Pulse if fan running ||
+||PA4/ADC4 || ADC || QTEMP || Current source transistor temperature ADC input (512 at 25 deg C) ||
+||PA5/ADC5 || || n.c. || ||
+||PA6/ADC6 || IN || TEMP_FAIL || Over-temperature (logic ''1' if temp outside window) (Note 1) ||
+||PA7/ADC7 || IN || OVER_CURRENT || Over-current (logic ''1' if over current set by pot) ||
+
+Note 1 - Window set by R105,R107,R108 (3 per channel).  Default values give 2.5V +/- 0.5V.
+''''Resistors R105 etc must be changed to 30k'''
+
+||''''Pin''' || '''Func''' || '''Name''' || '''Note''' ||
+||PB0-PB1 || IN || CH_ADR0-1 || Channel address 0-3 ||
+||PB2-PB4 || IN || SL_ADR0-2 || Slot address 0-7 ||
+||PB5-PB7 || IN || not used || programming connector ||
+||''''Pin''' || '''Func''' || '''Name''' || '''Note''' ||
+||PC0-PC11 || I2C || I2C SCL/SDA || disable except on channel 0? ||
+||PC2 || OUT || LED D1 || ''0' for on, uC status ||
+||PC3 || OUT || LED D5 || ''1' for on, laser on ||
+||PC4-PC7 || || n.c. || ||
+||''''Pin''' || '''Func''' || '''Name''' || '''Note''' ||
+||PD0/RXD0 || UART || RS-485 Rx || RS-485 receive data ||
+||PD1/TXD0 || UART || RS-485 Tx || RS-485 transmit data ||
+||PD2-PD3 || IN || FAULT0-1 || Fault input for TEC PWM (Note 2) ||
+||PD4 || OUT || PWM- || TEC PWM output (Note 3) ||
+||PD5 || OUT || PWM+ || TEC PWM output ||
+||PD6 || OUT || DE || RS-485 driver enable ||
+||PD7 || OUT || L_SHDN || Laser shutdown.  Logic ''1' to disable laser ||
+
+Note 2:  PWM condtions:  "00"-Overcurrent, "01"-Undervoltage, "10"-Overtemperature, "11"-Normal
+
+Note 3:  Assuming TEC is wired with "+'' lead to J20 pin 1, PWM+ provides cooling with PWM-='0'.  PWM- provides heating with PWM+='0'
+
+