COMe-mSP1 / Features and Interfaces
4.5 Fast I2C & SMBus
The COMe-mSP1 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
COMe-mSP1 with BIOS NOW1R118.
JIDA/external I2C speed
JIDA/external I2C speed JILI I2C speed SMBus speed
Setup ATOM™ Z510 ATOM™ Z530 ATOM™ Z510 ATOM™ Z530 ATOM™ Z510 ATOM™ Z530
Extra high not supported not supported not supported not supported 375 kHz 418 kHz
Very high 166 kHz 215 kHz 80 kHz 125 kHz 214 kHz 270 kHz
High 80 kHz 110 kHz 55 kHz 80 kHz 57 kHz 86 kHz
Medium 41 kHz 60 kHz 34 kHz 50 kHz 35 kHz 46 kHz
Slow 10 kHz 15 kHz 9.6 kHz 15 kHz 7.4 kHz 10 kHz
Very slow 1 kHz 2 kHz 1.5 kHz 2 kHz 0.7 kHz 1 kHz
Ultra slow 0.7 kHz 1 kHz not supported not supported not supported not supported
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