3.1.4 Channel Matrix Register

The CHANNEL_MATRIX register allows the users to map physical channels to logical channels. The number of available physical channels is defined by the AFE, which is determined in the AFE_SELECTION register except for the PIC32CXMTSH. Some AFEs offer a combination of single-ended and differential channels. For optimal performance when measuring low-level signals, it is recommended to use differential channels for current measurements.

The table below outlines how the physical channels (CHANNEL_x) are mapped to the supported configurations of the AFEs.


Configuration	Physical Channels
	CHANNEL_0	CHANNEL_1	CHANNEL_2	CHANNEL_3	CHANNEL_4	CHANNEL_5	CHANNEL_6	CHANNEL_7
1xATSENSE301	IP0/IN0¹	IP1/IN1	VP1/VN	IP2/IN2	VP2/VN	IP3/IN3	VP3/VN	N/A
3xMCP3910	CH0+/CH0-(in MCP3910 connected to CS0 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS0 of PIC32CXMTC)	CH0+/CH0-(in MCP3910 connected to CS1 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS1 of PIC32CXMTC)	CH0+/CH0-(in MCP3910 connected to CS2 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS2 of PIC32CXMTC)	N/A	N/A
4xMCP3910	CH0+/CH0-(in MCP3910 connected to CS0 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS0 of PIC32CXMTC)	CH0+/CH0-(in MCP3910 connected to CS1 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS1 of PIC32CXMTC)	CH0+/CH0-(in MCP3910 connected to CS2 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS2 of PIC32CXMTC)	CH0+/CH0-(in MCP3910 connected to CS3 of PIC32CXMTC)	CH1+/CH1-(in MCP3910 connected to CS3 of PIC32CXMTC)
1xMCP3912	CH0+/CH0-	CH1+/CH1-	CH2+/CH2-	CH3+/CH3-	N/A	N/A	N/A	N/A
1xMCP3913	CH0+/CH0-	CH1+/CH1-	CH2+/CH2-	CH3+/CH3-	CH4+/CH4-	CH5+/CH5-	N/A	N/A
1xMCP3914	CH0+/CH0-	CH1+/CH1-	CH2+/CH2-	CH3+/CH3-	CH4+/CH4-	CH5+/CH5-	CH6+/CH6-	CH7+/CH7-
PIC32CXMTSH	IP1/IN1	VP1/VN	IP2/IN2	VP2/VN	N/A	N/A	N/A	N/A

Note:

This channel is multiplexed with the internal temperature sensor of the ATSENSE301.

The logical channels defined by the metrology library are as follows:

I_A, I_B, I_C: Currents for phases A, B, and C
I_N: Neutral current
V_A, V_B, V_C: Voltages for phases A, B, and C
V_D (available only when using an MCP3914 AFE): It provides an additional ADC conversion for the application. The metrology library processes this channel with all metrology filters except for phase correction. This includes the calibration gain and the DC block filter, in case VC_DC_EN is cleared.

Name:	CHANNEL_MATRIX
Property:	Read-Write


Bit	31	30	29	28	27	26	25	24
	CHANNEL_7[3:0]				CHANNEL_6[3:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	23	22	21	20	19	18	17	16
	CHANNEL_5[3:0]				CHANNEL_4[3:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	15	14	13	12	11	10	9	8
	CHANNEL_3[3:0]				CHANNEL_2[3:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0


Bit	7	6	5	4	3	2	1	0
	CHANNEL_1[3:0]				CHANNEL_0[3:0]
Access	R/W	R/W	R/W	R/W	R/W	R/W	R/W	R/W
Reset	0	0	0	0	0	0	0	0