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CPLD
LS1028A
I2C2
I2C1
Program
I2C1_S DA
Addr = 0x77
PCA9847PWJ
1.8V
I2C1_CH0
I2C1_CH7
0
1
2
3
4
5
6
7
0
1
2
3
4
5
6
7
1.8V
1.8V
OVDD (1.8V)
S DHC_CD_B
S DHC_WP
I2C1_CH1
I2C1_CH2
I2C1_CH3
I2C1_CH5
I2C1_CH6
3.3V
3V3
NTS X2102GU8H
I/OVCC1
I/OVCC2
I/OVL1
I/OVL2
I/OVCC1
I/OVCC2
I/OVL1
I/OVL2
1V8
I2C1_S CL
1.8V
I2C3
CAN1
I2C4
CAN2
I2C5
GPIO1 24/25
I2C6
US B2_P WR FAULT
US B2_DR VVBUS
I2C1_CH4
Figure 16. I2C bus architecture
The multiplexer used for the I2C1 bus partitions the bus into eight sub-buses, called "channels." Software must program the
multiplexer to access one of the eight I2C1 channels. All boot-software-dependant devices are placed on channel 0, or "I2C1_CH0"
as it is named. Channel 0 is the default selection upon reset so that software has immediate access to critical resources.
All channels on I2C1 are translated to 3V3 except channel 1, which operates at 1V8 (OVDD) power supply.
The I2C devices available on the I2C1 bus are shown in the figure below.
I2C interface
QorIQ LS1028A Reference Design Board Reference Manual, Rev. b, 11/2018
NXP Semiconductors
COMPANY CONFIDENTIAL
35
Содержание QorIQ LS1028A
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