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)
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]

AT13382

Pinout Changes