Pinout Changes

In variant B of the SAM L21 there has been changes done in the 32- and 48-pin packages relating to the number and placement of the Peripheral Touch Controller (PTC) Y lines. The 32-pin packages have a reduced number of Y lines from 10 down to 7, and the 48-pin package has been reduced from 12 to 10 Y lines. In addition the Y2, Y3, and Y14 has been moved on all packages. In addition OPAMP pins OA_OUT[1] and OA_NEG[2] has swapped position.

Table 1. PTC pinout changes

PTC Y Line

Variant

A pin

Variant

B pin

SAML21E (32-pin)

SAML21G (48-pin)

SAML21J (64-pin)

Y[0]

PA02

PA02

Y[1]

PA03

PA03

Y[2]

PA04

PB10

removed

Y[3]

PA05

PB11

removed

Y[4]

PA06

PA06

Y[5]

PA07

PB12

removed removed

Y[6]

PA08

PA08

Y[7]

PA09

PA09

Y[8]

PA10

PA10

Y[9]

PA11

PA11

Y[10]

PB04

PB04

Y[11]

PB05

PB05

Y[12]

PB06

PB06

Y[13]

PB07

PB07

Y[14]

PB08

PB13

removed

Y[15]

PB09

PB09

Bold pins in the variant B column have changed positions from variant A to variant B. Pins marked as removed were available in variant A but are no longer available in variant B.

Table 2. OPAMP pinout changes

PIN

Variant A OPAMP pinout Variant B OPAMP pinout
PB06

OA_NEG[2]

OA_OUT[1]

PB08

OA_OUT[1]

OA_NEG[2]