Connecting to a UPDI Target

The recommended pinout for the 6-pin UPDI connector is shown in Figure 1.

Connection to a 6-pin 100-mil UPDI Header

Use the 6-pin 100-mil tap on the flat cable (included in some kits) to connect to a standard 100-mil UPDI header.

Connection to a 6-pin 50-mil UPDI Header

Use the adapter board (included in some kits) to connect to a standard 50-mil UPDI header.

Connection to a Custom 100-mil Header

The 10-pin mini-squid cable should be used to connect between the Atmel-ICE AVR connector port and the target board. Three connections are required, as described in the table below.

Table 1. Atmel-ICE UPDI Pin Mapping
Atmel-ICE AVR PORT Pin Target Pins Mini-Squid Pin Microchip STK600 UPDI Pinout
Pin 1 (TCK)   1  
Pin 2 (GND) GND 2 6
Pin 3 (TDO) UPDI_DATA 3 1
Pin 4 (VTG) VTG 4 2
Pin 5 (TMS)   5  
Pin 6 (nSRST)   6  
Pin 7 (Not connected)   7  
Pin 8 (nTRST)   8  
Pin 9 (TDI)   9  
Pin 10 (GND)   0