50.7.21 EMAFE Characteristics

Unless otherwise specified, external components characteristics according to the typical application diagram in the EMAFE section are as follows:

C_VREF=1 μF and C_VDDA=1 μF
EMAFE clock = 4.096 MHz
V_{DDIN_AFE} = VDD3V3 = 3.3V
Noise bandwidth = [30 Hz, 2 kHz] for measurement channels characteristics
T_J = [-40°C; +100°C]

Table 50-49. EMAFE Power Supply Characteristics
Symbol	Parameter	Comments	Min	Typ	Max	Unit
V_{VDDIN_AFE}	Supply voltage range	–	3.0	3.3	3.6	V
V_VDD3V3	Supply voltage range	–	3.0	3.3	3.6
V_VDDA	Supply voltage range	–	2.7	2.8	2.9	V
I_DDON	Current consumption on (VDDIN_AFE + VDD3V3)	EMAFE clock @ 4.096 MHz V_VDD3V3 = V_{VDDIN_AFE} = 3.3V k Channels ON (k≥1), Voltage reference ON, VDDA LDO regulator ON.	–	1.4 + k × 0.75	–	mA

Table 50-50. EMAFE VDD3V3 Power-On-Reset Thresholds ⁽¹⁾
Symbol	Parameter	Comments	Min	Typ	Max	Unit
V_{T_RISE}	VDD3V3 rising threshold	DC level	2.5	2.6	2.8	V
V_{T_FALL}	VDD3V3 falling threshold	DC level	2.35	2.5	2.65	V
V_{T_HYST}	V_{T_RISE}- V_{T_FALL}	–	90	120	180	mV

Note:

In case of power fail conditions on VDD3V3, this POR only resets EMAFE-related settings.

Table 50-51. Current or Voltage Measurement Channel Electrical Characteristics
Symbol	Parameter	Comments	Min	Typ	Max	Unit
V_VDDA	Operating supply voltage	–	2.7	2.8	2.9	V
I_DDON	Channel supply current⁽¹⁾ in VDD3V3 and VDDA	OFF	–	–	0.2	μA
I_DDON	Channel supply current⁽¹⁾ in VDD3V3 and VDDA	ON	–	0.75	1	mA
F_{EMAFE_CLK}	Main clock input frequency	–	3.9	4.096	4.3	MHz
V_{IND_FS}	A/D converter input referred full scale voltage⁽²⁾	V_REF = 1.2V V_IND = V_VPxor V_IND = V_IPx - V_INx G: Channel Gain = {1, 2, 4 or 8}	–	1.2/G	–	V_PP
V_{CM_IN}	Common mode input voltage range	(V_IPx + V_INx) / 2	-20	–	20	mV
Z_IN0	Common mode input impedance at T_J0 = 23°C	G: Channel Gain = {1, 2, 4 or 8} On VPx, IPx , INx pins. F_{EMAFE_CLK} = 4.096 MHz	400/G	480/G	560/G	kΩ
SINAD_PEAK	Peak signal to noise and distortion ratio. f_IN = 45 Hz to 66 Hz BW = [30Hz, 2 kHz]	Gain = 1, V_IND = 1.000 V_PP	–	84	–	dB
		Gain = 1, V_IND = 0.500 V_PP⁽³⁾	–	78	–
		Gain = 2, V_IND = 0.500 V_PP	–	84	–
		Gain = 4, V_IND = 0.250 V_PP	–	82	–
		Gain = 8, V_IND = 0.125 V_PP	–	81	–
E_N	Input referred noise voltage integrated over [30 Hz, 2 kHz]	Gain = 1	–	21	–	μV_RMS
		Gain = 2	–	10	–
		Gain = 4	–	6	–
		Gain = 8	–	3.3	–
S_N	Input referred noise voltage density at fundamental frequency. (Between 45 Hz and 66 Hz).	Gain = 1	–	470	–	nV/√Hz
		Gain = 2	–	220	–
		Gain = 4	–	130	–
		Gain = 8	–	73	–
EG₀	Gain error	T_J0 = 23°C; V_REF = 1.2V	-3	–	3	%
TC_G	Channel gain drift with temperature⁽⁴⁾	-40°C < T_J < 100°C, V_REF = 1.2V R_SOURCE = 3kΩ	–	-5	–	ppm /°C
V_OS0	Input referred offset	T_J0 = 23°C	-5/G	–	5/G	mV
TC_VOS	V_OS drift with temperature	-40°C < T_J < 100°C	-2	–	+2	μV/°C

Note:

Current consumption per measurement channel.
V_IND may be limited by the recommended input voltage on analog input pins (±0.25V, refer to Table 50-4).
Corresponds to the maximum signal on the voltage channel(s).
Includes the input impedance drift with temperature.

Table 50-52. EMAFE Precision Voltage Reference and Die Temperature Sensor Characteristics
Symbol	Parameter	Comments	Min	Typ	Max	Unit
V_VDDA	Operating supply voltage	–	2.7	2.8	2.9	V
I_VDDA	Supply current	OFF	–	–	0.1	μA
I_VDDA	Supply current	ON	–	70	100	μA
V_{REF_AFE0}	Output voltage initial accuracy	At T_J0 = 23°C	1.142	1.144	1.146	V
TC_{VREF_U}	V_REF drift with temperature⁽¹⁾	Uncompensated	–	50	–	ppm /°C
TC_{VREF_C}	V_REF drift with temperature⁽¹⁾	Using factory-programmed calibration registers	–	10	30	ppm /°C
R_OUT	V_{REF_AFE} output resistance	–	200	500	800	kΩ
D_{TEMP_Lin}	Die temperature sensor, digital reading linearity	–	–	±2	–	°C
I_{VREF_OFF}	Current in VREF pin when internal voltage reference is OFF	–	-100	–	100	nA

Note:

TC is defined using the box method: TC = ( V_{REF_AFE_MAX} - V_{REF_AFE_MIN} ) / ( V_{REF_AFE0}x ( T_MAX - T_MIN ) ).

Table 50-53. **EMAFE VDDA LDO Regulator**
Symbol	Parameter	Comments	Min	Typ	Max	Unit
V_{VDDIN_AFE}	Operating supply voltage	–	3.0	3.3	3.6	V
I_{VDDIN_AFE}	Supply current	OFF	–	–	0.1	μA
I_{VDDIN_AFE}	Supply current	ON	–	–	250	μA
I_O	Output current	–	–	–	15	mA
V_O	DC output voltage	I_O= 0 mA.	2.75	2.8V	2.85	V
ΔV_O/ ΔI_O	Static load regulation	I_O: 0 to I_OMAX	-5	–	–	mV/mA
ΔV_O/ ΔV_{DDIN_AFE}	Static line regulation	V_{DDIN_AFE}: 3.0 to 3.6V	-5	–	5	mV/V
PSRR	Power supply rejection ratio	f = DC to 2000 Hz	–	40	–	dB
PSRR	Power supply rejection ratio	f = 1 MHz	–	40	–	dB
t_ON	Start-up time	V_O from 0 to 95% of final value. I_O= 0 mA	–	–	1	ms
C_O	Stable output capacitor range	Capacitive	0.5	1	4.7	μF
C_O	Stable output capacitor range	Resistive	5	10	300	mΩ