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4.7 Fast I2C
The nanoETXexpress-SP integrates two configurable I2C buses. The external I2C provided via US15W GPIOs on COM
Express™ Connector Pin B33/B34, the LVDS I2C from US15W SCH is available on COM express™ connector pin
A83/A84. The I2C interface offers full MultiMaster and Clock Stretching support. Fast I2C clock speed depends on the
CPU performance and differs between ATOM™ Z510 and ATOM™ Z530 modules. See the tables below for measured
values on nanoETXexpress-SP with BIOS NOW1R113.
JIDA/external I2C speed
Setup
ATOM™ Z510
Extra high
not supported
Very high
150 kHz
High
80 kHz
Medium
40 kHz
Slow
11 kHz
Very slow
1.5 kHz
Ultra slow
0.8 kHz
JILI I2C speed
Setup
ATOM™ Z510
Extra high
not supported
Very high
90 kHz
High
36 kHz
Medium
18 kHz
Slow
2.8 kHz
Very slow
1.0 kHz
Ultra slow
not supported
47
ATOM™ Z530
not supported
210 kHz
110 kHz
60 kHz
16 kHz
2 kHz
1 kHz
ATOM™ Z530
not supported
125 kHz
50 kHz
25 kHz
4 kHz
1.3 kHz
not supported
nanoETXexpress-SP/Special Features
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