ing. The serial number string has the following format: "nnnnrrssssssssss" n = product identifier r = revision s = serial number The product identifier for SAM C21 Xplained Pro is A09-2419. 6.2. Revision 6 Revision 6 has silicon revision D or newer of the ATSAMC21J18A-AUTES (U300) device mounted, it is otherwise identical to revision 5. 6.3. Revision 5 Revision 5 fixes all known issues outlined on rev. 2-3. The power supply system is divided in two with a separate 3.3V regulator for both EDBG, and for the Target section. The power supply block diagram for revision 2 and 3 is shown below. The power switch has been redesigned to avoid voltage leakage at power on. The DAC, LIN, and CAN connectors have been moved to ease mounting in production. The RESET level-shifter has been redesigned to avoid leakage when target power is switched off. Atmel SAM C21 Xplained Pro [USER GUIDE] Atmel-42460D-SAM-C21-Xplained-Pro_User Guide-08/2016 38 Figure 6-1. Revision 2 and 3 Power Supply Block Diagram VCC_P3V3 VCC

nnrrssssssssss" n = product identifier r = revision s = serial number The product indentifier for SAM C21 Xplained Pro is A09-2419. 5.2. Revision 2 Revision 2 is the initial released revision. This revision has engineering samples mounted with part number ATSAMC21J18A-AUTES. 5.2.1. The QTouch Button PAD is not Connected On Revision 2 of the kit, the QTouch button PAD is not connected to the track inside the PCB. This will cuase the QTouch function to work only on the VIA connection point. There is no workaround for this issue. This will be fixed in next revision of the PCB. 5.2.2. Not starting up at 3.3V The kit has a start-up problem when target voltage is set to 3.3V Revision 2 of the kit has a start-up problem when target voltage is set to 3.3V. Often the EDBG does not enumerate when connected to a PC through the USB interface. It seems to enter a locked state where it does not run at all. This is caused by a short power surge on the 3.3V power net (VCC_P3V3), when it is connected to the targe

Fix Related Links The QTouch Button PAD is not Connected on page 42 Kit Does Not Work with 3.3V Target Voltage Selected on page 42 6.4. Revision 2 Revision 2 is the initial released revision. This revision has engineering samples mounted with part number ATSAMC21J18A-AUTES. 6.4.1. The QTouch Button PAD is not Connected On Revision 2 of the kit, the QTouch button PAD is not connected to the track inside the PCB. This will cause the QTouch function to work only on the VIA connection point. There is no workaround for this issue. This will be fixed in next revision of the PCB. 6.4.2. Kit Does Not Work with 3.3V Target Voltage Selected Revision 2 of the kit has a start-up problem when target voltage is set to 3.3V. When the EDBG opens the target voltage power switch from VCC_TARGET_SWITCH_P3V3_P5V0 to VCC_TARGET_P3V3_P5V0 a power surge is observed. This power surge causes the VCC_P3V3 nets voltage to decrease enough to trigger the EDBGs BOD, resulting in the EDBG entering a locked state where it can

20 21 22 23 24 25 26 27 28 29 30 31 32 @pin56 @pin8 BLM18PG471SN1D PA08_ADC0_CH8_ADC1_CH10_IBUS PA09_ADC0_CH9_ADC1_CH11_VBUS PA10_TCC0_WH PA11_BTN (VDDIN) VCC_P3V3 VDDANA PIM_MONITOR_3 VDCBUS1 PWM1H3 BTN C VCC_P3V3 L1 DNP PB12_LED HDR-1.27 Female 1x25 U1 ATSAMC21J18A-AUT LED2 nRESET 1 2 3 4 SWCLK 5 SWCLK 6 7 SWDIO 8 SWDIO 48 47 46 45 44 43 42 41 40 39 38 37 36 35 34 33 51 50 J1 PICkit 4 Connector J6 nRESET VDDIO GND PA25 PA24 PA23 PA22 PA21 PA20 PB17 PB16 PA19 PA18 PA17 PA16 VDDIO GND J2 26 HDR-1.27 Male 2x5 VCC_P3V3 J3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 nRESET J1 PA08 PA09 PA10 PA11 VDDIO GND PB10 PB11 PB12 PB13 PB14 PB15 PA12 PA13 PA14 PA15 PFC_1 PFC_VACZC PIM_MONITOR_1 PIM_MONITOR_2 PFC_1 PWM1H2 PFC_VACZC VDCBUS2 PB05 AGND VDDANA VDDANA PB06_ADC1_CH8_IPFC_IB PB07_ADC1_CH9_PFCVACZC_IA PB08_ADC0_CH2_ADC1_CH4_Uph PB09_ADC0_CH3_ADC1_CH5_Vph PA04_ADC0_CH4_IPFC_IB PA05_TCC0_VH PA06_ADC0_CH6_PFCVACZC_IA PA07_ADC0_CH7_VDC_ISHUNT SWDIO SWCLK 25 24 23 22 21 20 19 18 17 16