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LS1028A
OVDD
(1.8V)
CAN
XCVR
TJ A1051T/3
CAN1
(bottom)
CAN2
(top)
CAN
XCVR
TJ A1051T/3
3V3
5V
3V3
5V
OVDD (1.8V)
NORCOMP
178-009-613R571
or equiv
Dual-stack DB9male
LVC
2T45
LVC
2T45
CFG_DRV_INTERPOSER
from CPLD
IIC3_SCL
IIC4_SCL
IIC3_SDA
IIC4_SDA
OE
Figure 15. CAN architecture
2.13 I2C interface
The LS1028A processor supports up to six I2C buses. The I2C1 port is used for system setup and monitoring and the other ports
should be programmed to be used for SDHC1 CD and WP, CAN 1 and 2 interfaces, GPIO, and USB2 PWRFAULT & DRVVBUS.
These secondary functionalities should be enabled in the RCW field.
The I2C1 port is connected to a PCA9847PWJ I2C multiplexer to isolate address conflicts and to effectively manage the large
number of I2C devices. The I2C1 port is connected to the level shifter device NTSX2102GU8H (from NXP) to enable bidirectional
voltage level translation (1.8 V to 3.3 V and 3.3 V to 1.8 V) for CPLD and external I2C devices.
The figure below shows the I2C bus architecture.
LS1028ARDB Functional Description
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
34
COMPANY CONFIDENTIAL
NXP Semiconductors
Содержание QorIQ LS1028A
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