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4.17
Fast I2C & SMBus
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 and SMBus 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 NOW1R118.
JIDA/external I2C speed
-
JIDA/external I2C speed
Setup
ATOM™ Z510
Extra high
not supported
Very high
166 kHz
High
80 kHz
Medium
41 kHz
Slow
10 kHz
Very slow
1 kHz
Ultra slow
0.7 kHz
44
JILI I2C speed
ATOM™ Z530
ATOM™ Z510
not supported
not supported
215 kHz
80 kHz
110 kHz
55 kHz
60 kHz
34 kHz
15 kHz
9.6 kHz
2 kHz
1.5 kHz
1 kHz
not supported
SMBus speed
ATOM™ Z530
ATOM™ Z510
not supported
375 kHz
125 kHz
214 kHz
80 kHz
57 kHz
50 kHz
35 kHz
15 kHz
7.4 kHz
2 kHz
0.7 kHz
not supported
not supported
ATOM™ Z530
418 kHz
270 kHz
86 kHz
46 kHz
10 kHz
1 kHz
not supported
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