8.6 AFE pin configuration when not using on-board ADC's and
DAC
For an application which utilizes the MIPI-CSI2 interface to provide raw ADC data to the S32R274 device the unused pads
for the on board SD-ADC's and DAC, along with associated supplies must be configured as shown in
operation of the device. These connections also apply to the S32R372 257 MAPBGA package since this is pin compatible
and does not contain the on-board ADC's.
Table 20. AFE Pin Requirements when using off-chip ADC/DAC
Pin Number
Pin Name
Requirement
A1
SD_0_ADCN
Connect to SD_0_ADCP and leave floating (or N.C for S32R372)
A2
SD_1_ADCN
Connect to SD_1_ADCP and leave floating (or N.C for S32R372)
A3
SD_2_ADCN
Connect to SD_2_ADCP and leave floating (or N.C for S32R372)
A4
SD_3_ADCN
Connect to SD_3_ADCP and leave floating (or N.C for S32R372)
B1
SD_0_ADCP
Connect to SD_0_ADCN and leave floating (or N.C for S32R372)
B2
SD_1_ADCP
Connect to SD_1_ADCN and leave floating (or N.C for S32R372)
B3
SD_2_ADCP
Connect to SD_2_ADCN and leave floating (or N.C for S32R372)
B4
SD_3_ADCP
Connect to SD_3_ADCN and leave floating (or N.C for S32R372)
C1
SD_CM
1 μF Capacitor to Ground
C2
SD_R
Can be relaxed to 40k-47k Ohm +/- 10%
C5
DAC_C
Not used, leave floating
C7
DAC_AP
Not used, leave floating
C8
DAC_AN
Not used, leave floating
D4
AFE_FILTER
0.1 & 1 μF Capacitor to Ground
C3
VDD_LV_RADARREF
1uF Capacitor to Ground
D1
VDD_HV_RAW
3.3 V
D2
VSS_HV_RAW
Tied to Ground
D8
VDD_HV_DAC
3.3 V
D7
VSS_HV_DAC
Tied to Ground
E4
VDD_LV_SDADC
0.47 μF Capacitor to Ground
C4
VSS_LV_SDADC
Tied to Ground
D3
VDD_LV_RADARDIG
1 μF Capacitor to Ground
E3
VSS_LV_RADARDIG
Tied to Ground
F3
VDD_LV_OSC
0.1 & 1 μF Capacitor to Ground
F2
VSS_LV_OSC
Tied to Ground
E1
XOSC_XTAL
Differential clock supplied from external differential or -
F1
XOSC_EXTAL
Differential clock supplied from external differential source - or +
E2
VDD_LV_SDPLL
0.1 & 1 μF Capacitor to Ground
F4
VSS_LV_SDPLL
Tied to Ground
G3
VDD_LV_SDCLK
0.1 & 1 μF Capacitor to Ground
G4
VSS_LV_SDCLK
Tied to Ground
Table continues on the next page...
RADAR analog front end
S32R27/37 Hardware Design Guide, Rev. 1, 04/2018
28
NXP Semiconductors