SAM D21/DA1 Family

37.16.3 SERCOM in I²C Mode Timing

This section describes the requirements for devices connected to the I²C Interface Bus.

Figure 37-22. I²C Interface Bus Timing

Table 37-68. I²C Interface Timing (Device Variant A)
Symbol	Parameter		Conditions	Min.	Typ.	Max.	Units
t_R	Rise time for both SDA and SCL	Standard / Fast Mode	IC_b⁽²⁾ = 400pF	-	215	300	ns
		Fast Mode +	IC_b⁽²⁾ = 550pF		60	100
		High Speed Mode	IC_b⁽²⁾ = 100pF		20	40
t_OF	Output fall time from V_IHmin to V_ILmax	Standard / Fast Mode	10pF < C_b⁽²⁾ < 400pF		20.0	50.0
		Fast Mode +	10pF < C_b⁽²⁾ < 550pF		15.0	50.0
		High Speed Mode	10pF < C_b⁽²⁾< 100pF		10.0	40.0
t_HD;STA	Hold time (repeated) START condition		f_SCL> 100 kHz, Host	t_LOW-9	-	-
t_LOW	Low period of SCL Clock		f_SCL> 100 kHz	113	-	-
t_BUF	Bus free time between a STOP and a START condition		f_SCL> 100 kHz	t_LOW	-	-
t_SU;STA	Setup time for a repeated START condition		f_SCL> 100 kHz, Host	t_LOW+7	-	-
t_HD;DAT	Data hold time		f_SCL> 100 kHz, Host	9	-	12
t_SU;DAT	Data setup time		f_SCL> 100 kHz, Host	104	-	-
t_SU;STO	Setup time for STOP condition		f_SCL> 100 kHz, Host	t_LOW+9	-	-
t_SU;DAT;rx	Data setup time (receive mode)		f_SCL> 100 kHz, Client	51	-	56
t_HD;DAT;tx	Data hold time (send mode)		f_SCL> 100 kHz, Client	71	90	138

Table 37-69. I²C Interface Timing (Device Variant B,C and D)
Symbol	Parameter		Conditions	Min.	Typ.	Max.	Units
t_R	Rise time for both SDA and SCL	Standard / Fast Mode	C_b⁽²⁾ = 400pF	-	230	350	ns
		Fast Mode +	C_b⁽²⁾ = 550pF		60	100
		High Speed Mode	C_b⁽²⁾ = 100pF		30	60
t_OF	Output fall time from V_IHmin to V_ILmax	Standard / Fast Mode	10pF < C_b⁽²⁾ < 400pF		25	50
		Fast Mode +	10pF < C_b⁽²⁾ < 550pF		20	30
		High Speed Mode	10pF < C_b⁽²⁾< 100pF		10	20
t_HD;STA	Hold time (repeated) START condition		f_SCL> 100 kHz, Host	t_LOW-9	-	-
t_LOW	Low period of SCL Clock		f_SCL> 100 kHz	113	-	-
t_BUF	Bus free time between a STOP and a START condition		f_SCL> 100 kHz	t_LOW	-	-
t_SU;STA	Setup time for a repeated START condition		f_SCL> 100 kHz, Host	t_LOW+7	-	-
t_HD;DAT	Data hold time		f_SCL> 100 kHz, Host	9	-	12
t_SU;DAT	Data setup time		f_SCL> 100 kHz, Host	104	-	-
t_SU;STO	Setup time for STOP condition		f_SCL> 100 kHz, Host	t_LOW+9	-	-
t_SU;DAT;rx	Data setup time (receive mode)		f_SCL> 100 kHz, Client	51	-	56
t_HD;DAT;tx	Data hold time (send mode)		f_SCL> 100 kHz, Client	71	90	138

Note:

These values are based on simulation. These values are not covered by test limits in production.
C_b = Capacitive load on each bus line. Otherwise noted, value of C_b set to 20pF.

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