Exchange the attiny for an atmega48

Remove the RTC as the atmega has an internal timer which can be used to
wake the microcontroller.

weather_station_sensor-cache.lib

@@ -38,27 +38,6 @@ X ~ 2 0 -150 110 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# Device_Crystal
-#
-DEF Device_Crystal Y 0 40 N N 1 F N
-F0 "Y" 0 150 50 H V C CNN
-F1 "Device_Crystal" 0 -150 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-$FPLIST
- Crystal*
-$ENDFPLIST
-DRAW
-S -45 100 45 -100 0 1 12 N
-P 2 0 1 0 -100 0 -75 0 N
-P 2 0 1 20 -75 -50 -75 50 N
-P 2 0 1 20 75 -50 75 50 N
-P 2 0 1 0 100 0 75 0 N
-X 1 1 -150 0 50 R 50 50 1 1 P
-X 2 2 150 0 50 L 50 50 1 1 P
-ENDDRAW
-ENDDEF
-#
 # Device_D_Zener
 #
 DEF Device_D_Zener D 0 40 N N 1 F N
@@ -126,27 +105,51 @@ X ~ 2 0 -150 50 U 50 50 1 1 P
 ENDDRAW
 ENDDEF
 #
-# MCU_Microchip_ATtiny_ATtiny25-20SU
+# MCU_Microchip_ATmega_ATmega48PA-AU
 #
-DEF MCU_Microchip_ATtiny_ATtiny25-20SU U 0 20 Y Y 1 F N
-F0 "U" -500 550 50 H V L BNN
-F1 "MCU_Microchip_ATtiny_ATtiny25-20SU" 100 -550 50 H V L TNN
-F2 "Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm" 0 0 50 H I C CIN
+DEF MCU_Microchip_ATmega_ATmega48PA-AU U 0 20 Y Y 1 F N
+F0 "U" -500 1450 50 H V L BNN
+F1 "MCU_Microchip_ATmega_ATmega48PA-AU" 100 -1450 50 H V L TNN
+F2 "Package_QFP:TQFP-32_7x7mm_P0.8mm" 0 0 50 H I C CIN
 F3 "" 0 0 50 H I C CNN
-ALIAS ATtiny25-20SU ATtiny45V-10SU ATtiny45-20SU ATtiny85V-10SU ATtiny85-20SU
+ALIAS ATmega48P-20AU ATmega48A-AU ATmega48PA-AU ATmega88PV-10AU ATmega88P-20AU ATmega88A-AU ATmega88PA-AU ATmega168PV-10AU ATmega168P-20AU ATmega168A-AU ATmega168PA-AU ATmega328-AU ATmega328P-AU
 $FPLIST
- SOIJ*5.3x5.3mm*P1.27mm*
+ TQFP*7x7mm*P0.8mm*
 $ENDFPLIST
 DRAW
-S -500 -500 500 500 0 1 10 f
-X ~RESET~/PB5 1 600 -200 100 L 50 50 1 1 B
-X XTAL1/PB3 2 600 0 100 L 50 50 1 1 B
-X XTAL2/PB4 3 600 -100 100 L 50 50 1 1 B
-X GND 4 0 -600 100 U 50 50 1 1 W
-X AREF/PB0 5 600 300 100 L 50 50 1 1 B
-X PB1 6 600 200 100 L 50 50 1 1 B
-X PB2 7 600 100 100 L 50 50 1 1 B
-X VCC 8 0 600 100 D 50 50 1 1 W
+S -500 -1400 500 1400 0 1 10 f
+X PD3 1 600 -800 100 L 50 50 1 1 B
+X PD6 10 600 -1100 100 L 50 50 1 1 B
+X PD7 11 600 -1200 100 L 50 50 1 1 B
+X PB0 12 600 1200 100 L 50 50 1 1 B
+X PB1 13 600 1100 100 L 50 50 1 1 B
+X PB2 14 600 1000 100 L 50 50 1 1 B
+X PB3 15 600 900 100 L 50 50 1 1 B
+X PB4 16 600 800 100 L 50 50 1 1 B
+X PB5 17 600 700 100 L 50 50 1 1 B
+X AVCC 18 100 1500 100 D 50 50 1 1 W
+X ADC6 19 -600 1000 100 R 50 50 1 1 I
+X PD4 2 600 -900 100 L 50 50 1 1 B
+X AREF 20 -600 1200 100 R 50 50 1 1 P
+X GND 21 0 -1500 100 U 50 50 1 1 P N
+X ADC7 22 -600 900 100 R 50 50 1 1 I
+X PC0 23 600 300 100 L 50 50 1 1 B
+X PC1 24 600 200 100 L 50 50 1 1 B
+X PC2 25 600 100 100 L 50 50 1 1 B
+X PC3 26 600 0 100 L 50 50 1 1 B
+X PC4 27 600 -100 100 L 50 50 1 1 B
+X PC5 28 600 -200 100 L 50 50 1 1 B
+X ~RESET~/PC6 29 600 -300 100 L 50 50 1 1 B
+X GND 3 0 -1500 100 U 50 50 1 1 W
+X PD0 30 600 -500 100 L 50 50 1 1 B
+X PD1 31 600 -600 100 L 50 50 1 1 B
+X PD2 32 600 -700 100 L 50 50 1 1 B
+X VCC 4 0 1500 100 D 50 50 1 1 W
+X GND 5 0 -1500 100 U 50 50 1 1 P N
+X VCC 6 0 1500 100 D 50 50 1 1 P N
+X XTAL1/PB6 7 600 600 100 L 50 50 1 1 B
+X XTAL2/PB7 8 600 500 100 L 50 50 1 1 B
+X PD5 9 600 -1000 100 L 50 50 1 1 B
 ENDDRAW
 ENDDEF
 #
@@ -256,33 +259,6 @@ X VDD 8 100 600 200 D 50 50 1 1 W
 ENDDRAW
 ENDDEF
 #
-# Timer_MCP7940N-xP
-#
-DEF Timer_MCP7940N-xP U 0 20 Y Y 1 F N
-F0 "U" -250 350 50 H V C CNN
-F1 "Timer_MCP7940N-xP" 450 350 50 H V C CNN
-F2 "" 0 0 50 H I C CNN
-F3 "" 0 0 50 H I C CNN
-ALIAS MCP7940N-xP MCP7940N-xSN MCP7940N-xST
-$FPLIST
- SOIC*3.9x4.9mm*P1.27mm*
- TSSOP*4.4x3mm*P0.65mm*
- MSOP*3x3mm*P0.65mm*
- DIP*W7.62mm*
-$ENDFPLIST
-DRAW
-S -300 300 300 -300 0 1 10 f
-X X1 1 400 100 100 L 50 50 1 1 I
-X X2 2 400 -100 100 L 50 50 1 1 O
-X VBAT 3 100 400 100 D 50 50 1 1 W
-X VSS 4 0 -400 100 U 50 50 1 1 W
-X SDA 5 -400 100 100 R 50 50 1 1 B
-X SCL 6 -400 200 100 R 50 50 1 1 I
-X MFP 7 -400 -100 100 R 50 50 1 1 C
-X VCC 8 0 400 100 D 50 50 1 1 W
-ENDDRAW
-ENDDEF
-#
 # power_+5V
 #
 DEF power_+5V #PWR 0 0 Y Y 1 F P

weather_station_sensor.sch

@@ -166,71 +166,16 @@ Wire Wire Line
 Wire Wire Line
 	9800 5050 9900 5050
 $Comp
-L MCU_Microchip_ATtiny:ATtiny25-20SU U?
-U 1 1 5E58DA03
-P 6350 2150
-F 0 "U?" H 5821 2196 50  0000 R CNN
-F 1 "ATtiny25-20SU" H 5821 2105 50  0000 R CNN
-F 2 "Package_SO:SOIJ-8_5.3x5.3mm_P1.27mm" H 6350 2150 50  0001 C CIN
-F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/atmel-2586-avr-8-bit-microcontroller-attiny25-attiny45-attiny85_datasheet.pdf" H 6350 2150 50  0001 C CNN
-	1    6350 2150
-	1    0    0    -1  
-$EndComp
-$Comp
-L Device:C C?
-U 1 1 5E58F8C5
-P 5350 1650
-F 0 "C?" H 5465 1696 50  0000 L CNN
-F 1 "100n" H 5465 1605 50  0000 L CNN
-F 2 "" H 5388 1500 50  0001 C CNN
-F 3 "~" H 5350 1650 50  0001 C CNN
-	1    5350 1650
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	5350 1500 6350 1500
-Wire Wire Line
-	6350 1500 6350 1550
-$Comp
-L power:VCC #PWR?
-U 1 1 5E590F43
-P 6350 1400
-F 0 "#PWR?" H 6350 1250 50  0001 C CNN
-F 1 "VCC" H 6367 1573 50  0000 C CNN
-F 2 "" H 6350 1400 50  0001 C CNN
-F 3 "" H 6350 1400 50  0001 C CNN
-	1    6350 1400
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	6350 1400 6350 1500
-Connection ~ 6350 1500
-$Comp
-L power:GND #PWR?
-U 1 1 5E5916A8
-P 5350 1850
-F 0 "#PWR?" H 5350 1600 50  0001 C CNN
-F 1 "GND" H 5355 1677 50  0000 C CNN
-F 2 "" H 5350 1850 50  0001 C CNN
-F 3 "" H 5350 1850 50  0001 C CNN
-	1    5350 1850
-	1    0    0    -1  
-$EndComp
-$Comp
 L power:GND #PWR?
 U 1 1 5E5919B1
-P 6350 2800
-F 0 "#PWR?" H 6350 2550 50  0001 C CNN
-F 1 "GND" H 6355 2627 50  0000 C CNN
-F 2 "" H 6350 2800 50  0001 C CNN
-F 3 "" H 6350 2800 50  0001 C CNN
-	1    6350 2800
+P 4800 4000
+F 0 "#PWR?" H 4800 3750 50  0001 C CNN
+F 1 "GND" H 4805 3827 50  0000 C CNN
+F 2 "" H 4800 4000 50  0001 C CNN
+F 3 "" H 4800 4000 50  0001 C CNN
+	1    4800 4000
 	1    0    0    -1  
 $EndComp
-Wire Wire Line
-	6350 2800 6350 2750
-Wire Wire Line
-	5350 1850 5350 1800
 $Comp
 L power:GND #PWR?
 U 1 1 5E595499
@@ -244,31 +189,19 @@ F 3 "" H 9250 3400 50  0001 C CNN
 $EndComp
 Wire Wire Line
 	9250 3300 9250 3400
-Text GLabel 7050 1950 2    50   Input ~ 0
+Text GLabel 5950 1700 2    50   Input ~ 0
 MISO
-Wire Wire Line
-	7050 1950 6950 1950
-Text GLabel 7050 1850 2    50   Input ~ 0
+Text GLabel 5950 1600 2    50   Input ~ 0
 MOSI
-Wire Wire Line
-	7050 1850 6950 1850
-Text GLabel 7050 2050 2    50   Input ~ 0
+Text GLabel 5950 1800 2    50   Input ~ 0
 SCK
-Text GLabel 7050 2350 2    50   Input ~ 0
+Text GLabel 6250 3550 2    50   Input ~ 0
 NRF24_CS
-Wire Wire Line
-	7050 2350 6950 2350
-Text GLabel 7050 2250 2    50   Input ~ 0
+Text GLabel 6250 3450 2    50   Input ~ 0
 BME280_CS
-Wire Wire Line
-	7050 2250 6950 2250
-Wire Wire Line
-	7050 2050 6950 2050
 NoConn ~ 8750 3000
-Text GLabel 7050 2150 2    50   Input ~ 0
+Text GLabel 6250 3350 2    50   Input ~ 0
 CE
-Wire Wire Line
-	7050 2150 6950 2150
 Text GLabel 8650 2900 0    50   Input ~ 0
 CE
 Wire Wire Line
@@ -310,8 +243,6 @@ Text GLabel 9900 4850 2    50   Input ~ 0
 MOSI
 Text GLabel 9900 5050 2    50   Input ~ 0
 BME280_CS
-Text Notes 4550 950  0    50   ~ 0
-TODO: add ISP connection
 $Comp
 L Power_Supervisor:TPS3839DBZ U?
 U 1 1 5E5B3B08
@@ -502,10 +433,6 @@ Wire Notes Line
 	4100 5600 4100 7150
 Wire Notes Line
 	4100 7150 6050 7150
-Wire Notes Line
-	6050 7150 6050 5600
-Wire Notes Line
-	6050 5600 4100 5600
 Text Notes 4150 7050 0    50   ~ 0
 TODO: not needed if only two batteries are used
 Text Notes 800  4400 0    50   ~ 0
@@ -603,269 +530,72 @@ Wire Notes Line
 Wire Notes Line
 	3350 4150 650  4150
 $Comp
-L Timer:MCP7940N-xP U?
-U 1 1 5E78DE5B
-P 2300 1900
-F 0 "U?" H 2300 1411 50  0000 C CNN
-F 1 "MCP7940M-IST" H 2300 1320 50  0000 C CNN
-F 2 "" H 2300 1900 50  0001 C CNN
-F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/20005010F.pdf" H 2300 1900 50  0001 C CNN
-	1    2300 1900
-	1    0    0    -1  
-$EndComp
-Text GLabel 5250 3000 0    50   Input ~ 0
-wake-up-interrupt
-Text GLabel 1300 2000 0    50   Input ~ 0
-wake-up-interrupt
-Wire Wire Line
-	1300 2000 1350 2000
-$Comp
-L Device:C C?
-U 1 1 5E79277C
-P 1900 1150
-F 0 "C?" H 2015 1196 50  0000 L CNN
-F 1 "100n" H 2015 1105 50  0000 L CNN
-F 2 "" H 1938 1000 50  0001 C CNN
-F 3 "~" H 1900 1150 50  0001 C CNN
-	1    1900 1150
-	1    0    0    -1  
-$EndComp
-$Comp
-L power:GND #PWR?
-U 1 1 5E792783
-P 1900 1350
-F 0 "#PWR?" H 1900 1100 50  0001 C CNN
-F 1 "GND" H 1905 1177 50  0000 C CNN
-F 2 "" H 1900 1350 50  0001 C CNN
-F 3 "" H 1900 1350 50  0001 C CNN
-	1    1900 1350
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	1900 1350 1900 1300
-Wire Wire Line
-	2300 1500 2300 1000
-Wire Wire Line
-	2300 1000 1900 1000
-NoConn ~ 2400 1500
-Text GLabel 1800 1700 0    50   Input ~ 0
-SCL
-Text GLabel 1800 1800 0    50   Input ~ 0
-SDA
-Wire Wire Line
-	1800 1700 1900 1700
-Wire Wire Line
-	1900 1800 1800 1800
-$Comp
-L Device:Crystal Y?
-U 1 1 5E7A1D98
-P 2950 1900
-F 0 "Y?" V 2904 2031 50  0000 L CNN
-F 1 "32.768 kHz" V 2995 2031 50  0000 L CNN
-F 2 "" H 2950 1900 50  0001 C CNN
-F 3 "~" H 2950 1900 50  0001 C CNN
-	1    2950 1900
-	0    1    1    0   
-$EndComp
-$Comp
-L Device:C C?
-U 1 1 5E7A2611
-P 3150 2300
-F 0 "C?" V 2898 2300 50  0000 C CNN
-F 1 "C" V 2989 2300 50  0000 C CNN
-F 2 "" H 3188 2150 50  0001 C CNN
-F 3 "~" H 3150 2300 50  0001 C CNN
-	1    3150 2300
-	0    1    1    0   
-$EndComp
-$Comp
-L Device:C C?
-U 1 1 5E7A2B7C
-P 3150 1600
-F 0 "C?" V 2898 1600 50  0000 C CNN
-F 1 "C" V 2989 1600 50  0000 C CNN
-F 2 "" H 3188 1450 50  0001 C CNN
-F 3 "~" H 3150 1600 50  0001 C CNN
-	1    3150 1600
-	0    1    1    0   
-$EndComp
-Wire Wire Line
-	3000 1600 2950 1600
-Wire Wire Line
-	2950 1600 2950 1700
-Wire Wire Line
-	2950 2300 3000 2300
-Wire Wire Line
-	2950 2050 2950 2100
-Wire Wire Line
-	2950 2100 2800 2100
-Wire Wire Line
-	2800 2100 2800 2000
-Wire Wire Line
-	2800 2000 2700 2000
-Connection ~ 2950 2100
-Wire Wire Line
-	2950 2100 2950 2300
-Wire Wire Line
-	2700 1800 2800 1800
-Wire Wire Line
-	2800 1800 2800 1700
-Wire Wire Line
-	2800 1700 2950 1700
-Connection ~ 2950 1700
-Wire Wire Line
-	2950 1700 2950 1750
-$Comp
 L power:GND #PWR?
-U 1 1 5E7B6002
-P 3600 2350
-F 0 "#PWR?" H 3600 2100 50  0001 C CNN
-F 1 "GND" H 3605 2177 50  0000 C CNN
-F 2 "" H 3600 2350 50  0001 C CNN
-F 3 "" H 3600 2350 50  0001 C CNN
-	1    3600 2350
-	1    0    0    -1  
-$EndComp
-Wire Wire Line
-	3600 2350 3600 2300
-Wire Wire Line
-	3600 2300 3300 2300
-Wire Wire Line
-	3600 2300 3600 1600
-Wire Wire Line
-	3600 1600 3300 1600
-Connection ~ 3600 2300
-Text GLabel 4000 1600 0    50   Input ~ 0
-SCL
-Text GLabel 4000 1700 0    50   Input ~ 0
-SDA
-$Comp
-L Device:R R?
-U 1 1 5E7DCEA4
-P 4100 1350
-F 0 "R?" H 4170 1396 50  0000 L CNN
-F 1 "2.2k" H 4170 1305 50  0000 L CNN
-F 2 "" V 4030 1350 50  0001 C CNN
-F 3 "~" H 4100 1350 50  0001 C CNN
-	1    4100 1350
-	1    0    0    -1  
-$EndComp
-Connection ~ 1350 2000
-Wire Wire Line
-	1350 2000 1900 2000
-$Comp
-L power:VCC #PWR?
-U 1 1 5E7E9D29
-P 1350 1600
-F 0 "#PWR?" H 1350 1450 50  0001 C CNN
-F 1 "VCC" H 1367 1773 50  0000 C CNN
-F 2 "" H 1350 1600 50  0001 C CNN
-F 3 "" H 1350 1600 50  0001 C CNN
-	1    1350 1600
+U 1 1 5E83B925
+P 4850 6450
+F 0 "#PWR?" H 4850 6200 50  0001 C CNN
+F 1 "GND" H 4855 6277 50  0000 C CNN
+F 2 "" H 4850 6450 50  0001 C CNN
+F 3 "" H 4850 6450 50  0001 C CNN
+	1    4850 6450
 	1    0    0    -1  
 $EndComp
 $Comp
-L power:VCC #PWR?
-U 1 1 5E7EE0C4
-P 2300 900
-F 0 "#PWR?" H 2300 750 50  0001 C CNN
-F 1 "VCC" H 2317 1073 50  0000 C CNN
-F 2 "" H 2300 900 50  0001 C CNN
-F 3 "" H 2300 900 50  0001 C CNN
-	1    2300 900 
+L MCU_Microchip_ATmega:ATmega48PA-AU U?
+U 1 1 5E857B8D
+P 5250 2500
+F 0 "U?" H 5250 911 50  0000 C CNN
+F 1 "ATmega48PA-AU" H 5250 820 50  0000 C CNN
+F 2 "Package_QFP:TQFP-32_7x7mm_P0.8mm" H 5250 2500 50  0001 C CIN
+F 3 "http://ww1.microchip.com/downloads/en/DeviceDoc/ATmega48PA_88PA_168PA-Data-Sheet-40002011A.pdf" H 5250 2500 50  0001 C CNN
+	1    5250 2500
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	2300 900  2300 1000
-Connection ~ 2300 1000
-Wire Wire Line
-	1350 1950 1350 2000
-Wire Wire Line
-	1350 1600 1350 1650
+	4800 4000 5250 4000
 $Comp
-L Device:R R?
-U 1 1 5E7E61B4
-P 1350 1800
-F 0 "R?" H 1420 1846 50  0000 L CNN
-F 1 "10k" H 1420 1755 50  0000 L CNN
-F 2 "" V 1280 1800 50  0001 C CNN
-F 3 "~" H 1350 1800 50  0001 C CNN
-	1    1350 1800
-	1    0    0    -1  
-$EndComp
-$Comp
-L Device:R R?
-U 1 1 5E7FF3CC
-P 4450 1350
-F 0 "R?" H 4520 1396 50  0000 L CNN
-F 1 "2.2k" H 4520 1305 50  0000 L CNN
-F 2 "" V 4380 1350 50  0001 C CNN
-F 3 "~" H 4450 1350 50  0001 C CNN
-	1    4450 1350
+L Device:C C?
+U 1 1 5E888344
+P 4350 900
+F 0 "C?" H 4465 946 50  0000 L CNN
+F 1 "100n" H 4465 855 50  0000 L CNN
+F 2 "" H 4388 750 50  0001 C CNN
+F 3 "~" H 4350 900 50  0001 C CNN
+	1    4350 900 
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4000 1600 4100 1600
-Wire Wire Line
-	4100 1600 4100 1500
-Wire Wire Line
-	4100 1600 4900 1600
-Connection ~ 4100 1600
-Wire Wire Line
-	4450 1700 4450 1500
-Wire Wire Line
-	4000 1700 4450 1700
+	4350 700  5250 700 
 $Comp
-L power:VCC #PWR?
-U 1 1 5E81A5BB
-P 4300 1100
-F 0 "#PWR?" H 4300 950 50  0001 C CNN
-F 1 "VCC" H 4317 1273 50  0000 C CNN
-F 2 "" H 4300 1100 50  0001 C CNN
-F 3 "" H 4300 1100 50  0001 C CNN
-	1    4300 1100
+L power:GND #PWR?
+U 1 1 5E88834B
+P 4350 1100
+F 0 "#PWR?" H 4350 850 50  0001 C CNN
+F 1 "GND" H 4355 927 50  0000 C CNN
+F 2 "" H 4350 1100 50  0001 C CNN
+F 3 "" H 4350 1100 50  0001 C CNN
+	1    4350 1100
 	1    0    0    -1  
 $EndComp
 Wire Wire Line
-	4450 1200 4450 1150
+	4350 1100 4350 1050
 Wire Wire Line
-	4450 1150 4300 1150
+	5350 700  5350 1000
 Wire Wire Line
-	4100 1150 4100 1200
+	5250 700  5250 1000
+Connection ~ 5250 700 
 Wire Wire Line
-	4300 1100 4300 1150
-Connection ~ 4300 1150
+	5250 700  5350 700 
 Wire Wire Line
-	4300 1150 4100 1150
+	4350 700  4350 750 
 Wire Wire Line
-	4450 1700 4900 1700
-Connection ~ 4450 1700
+	5950 1600 5850 1600
 Wire Wire Line
-	1700 2300 2300 2300
+	5950 1700 5850 1700
 Wire Wire Line
-	1700 2350 1700 2300
-$Comp
-L power:GND #PWR?
-U 1 1 5E7CF38D
-P 1700 2350
-F 0 "#PWR?" H 1700 2100 50  0001 C CNN
-F 1 "GND" H 1705 2177 50  0000 C CNN
-F 2 "" H 1700 2350 50  0001 C CNN
-F 3 "" H 1700 2350 50  0001 C CNN
-	1    1700 2350
-	1    0    0    -1  
-$EndComp
-$Comp
-L power:GND #PWR?
-U 1 1 5E83B925
-P 4850 6450
-F 0 "#PWR?" H 4850 6200 50  0001 C CNN
-F 1 "GND" H 4855 6277 50  0000 C CNN
-F 2 "" H 4850 6450 50  0001 C CNN
-F 3 "" H 4850 6450 50  0001 C CNN
-	1    4850 6450
-	1    0    0    -1  
-$EndComp
-Text Notes 3300 3700 0    50   ~ 0
-further pins needed:\n- interrupt-pin for wake-up\n- SCL\n- SDA\n- \n\nThe SCL and SDA pins could be substituted by a SPI-to-I2C-converter, but then another CS-pin would be necessary.
+	5950 1800 5850 1800
+Wire Notes Line
+	6050 7150 6050 5600
+Wire Notes Line
+	6050 5600 4100 5600
 $EndSCHEMATC