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+12V

Requires external 5a fuse on 12v Populate R7 with 120k for LSU 4.9, leave empty for LSU 4.2 R1 is a 1/2 Watt resistor, it is physically larger than the other resistors R14+R15 sets the contrast of the LCD, the values shown on this schematic is specific to the LCD supplied by 14Point7. Using another LCD may require adjustments to the resistor values R16 sets the LCD backlight brightness Never connect or disconnect the Lambda sensor while SLC Free is powered

+5V

GND

+5V

D3 P6KE24A

2

C3

C4

47uf

100nf

GND

10k

CY8C24423A-24PXI

R4 1k R8

IC3 IRF3710

1K R13

10k

R7

28 GND 1k 27 RT_ADC LSU_IA 26 P0[4] R6 25 AC_TEMP_SENSE_OUT 24 RE+_ADC 23 LCD_RW C8 22 LCD_E 21 LCD_DB6 100nf 20 LCD_DB4 19XRES 1k 18PWM_NB_OUT GND 17PWM_HEATER R11 16 CAL LSU_HEATER15 PROG_SDA

LSU_NERMEST +5V

C6

C5

GND

1uf

+12V

+5V R3 R2

1k GND

IC2

3

100nf

+12V

R5 61.9

100nf

GND

APE_ADC LSU_IA LSU_VGND INSAMP_VREF P2[7] LCD_RS LCD_DB7 LCD_DB5

VO

VI

GND

47uf

1 2 3 4 5 6

1 2 C7 3 4 100nf 5 6 7 8 9 GND 10 P1[7] R12 LIN_OUT PWM_LIN_OUT 11 C10 12 P1[3] 1k PROG_SCL 13 100nf 14

GND

1

C2

R10

1 2 3 4 5 6

1N4004 IC1 D1 7805T C1

LSU_IP

JP3

JP5 P0[4] P1[3] P1[7] P2[7]

R1 D2 1N4004 10

JP2

LSU_HEATERLSU_VGND LSU_NERMEST LSU_IA LSU_IP

1k

+5V GND XRES PROG_SCL PROG_SDA

1 2 3 4 5

H_GND GND LIN_OUT NB_OUT

GND 1 2 3 4 5

JP1

R9

+5V

GND

LCD_DB4 LCD_DB5 LCD_DB6 LCD_DB7 R16 LCD_ANODE 100

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1k +5V

R14

C11 LCD_CONTRAST LCD_RS 100nf LCD_RW LCD_E GND

R15

1.2k

4.7k +5V

+5V

JP4 GND

H_GND

3/12/2014 7:21:21 PM f=1.33 C:\Work\PCB\SLC_Free\SLC_Free_Oct_28_2013\SLC_Free_Oct_28_2013.sch (Sheet: 1/1)

NB_OUT C9 100nf GND