• Place data signals at least 2 times the trace width away from any copper plan.
Figure 4-31. ISC Layout Example
Clock
Trace
Data
Traces
Data
Traces
W
3W
W
3W
2W
2W
2W
Copper
Plane
4.6.4.3
EMI Improvement Recommendations
To reduce radiation emission, consider the following recommendations:
• Position the ISC bus interface in inner layers of the PCB.
• Add a ferrite bead on PCLK and on XCLK clocks lines.
• Add a ferrite bead on the camera power supply.
• Select a shielded camera connector.
Figure 4-32. EMI Improvement Example
IMAGE SENSOR CONNECTOR
Molex_52437-2491
IMAGE SENSOR
GND
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
J
ISI_SDA
AVDD_3V
ISI_SCL
DVDD_1V5
VDD_ISC
AGND
RESET
VSYNC
PWDN
HREF
Y9
XCLK
Y8
Y7
PCLK
Y6
Y2
Y5
Y3
Y4
DOVDD
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
22R
0402 1%
R
220R
FB*
220R
*BLM18AG221SN1D
FB*
PC24
66
PC7
177
PC25
61
PC22
65
PC23
59
PC10
60
PC9
69
PC21
63
ATSAMA5D27-WLSOM1
U1
PC11
68
PC12
67
PC13
64
PC14
62
PC15
71
PC16
57
GND
GND
1
VREF1
2
VREF2 7
SCL1
3
SCL2 6
SDA1
4
SDA2 5
EN 8
U
PCA9306DCUR
ISI_SDA
ISI_SCL
ISC_TWCK
ISC_TWD
3V3_VIN
0.1uF
25V
0402
C53
GND
0.1uF
25V
0402
C
GND
200k
R
DOVDD_2V8
4k7
R
DOVDD_2V8
4k7
R
ATSAMA5D27-WLSOM1
U1
PD20
122
PD19
120
VIN
1
GND 2
EN
3
NC
4
VOUT 5
MIC5366-3.0YC5
U
1uF
C
1uF
C
AVDD_3V
AGND
GND
3V3_IN
0R
R
VIN
1
GND 2
EN
3
NC
4
VOUT 5
MIC5366-1.5YC5
U
1uF
C
1uF
C
DVDD_1V5
GND
GND
3V3_VIN
30R
FB
0.1uF
10V
0402
C
GND
1uF
10V
0402
C
GND
BLM18PG300SN1D
VDD_3V3
4.6.5
Connecting to the SPI Interface
Four different FLEXCOM interfaces, with seven possible configurations (configured in SPI mode), and two pure SPI
Interfaces, with four possible configurations, are available on the ATSAMA5D27-WLSOM1 module.
The Flexible Serial Communication Controller (FLEXCOM) offers several serial communication protocols that are
managed by the three submodules USART, SPI, and TWI.
The Serial Peripheral Interface (SPI) circuit is a synchronous serial data link that provides communication with
external devices in Host or Client mode. It also enables communication between processors if an external processor
is connected to the system.
SAMA5D27 Wireless SOM1
Functional Description
©
2021 Microchip Technology Inc.
and its subsidiaries
Complete Datasheet
DS60001590D-page 40