I²C Address Space

This article provides an overview of the 7-bit address allocation on the I²C bus.

To check all the I²C addresses of sensors on your CHESTER, you can use the I²C scan shell command.

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Typically, you will not need to search for the I²C addresses while working with the CHESTER SDK. Everything is pre-defined in the DeviceTree specifications. However, you will need to check for the potential collision if you need to integrate a new I²C peripheral.

Allocation Table

Block	Address	Device	Remark
CHESTER-Z1	0x10	STM32L0
CHESTER-S1	0x11	STM32L0
CHESTER-M	0x18	DS2484
CHESTER-M	0x19	LIS2DH12
CHESTER-X8	0x1d	ADXL355
CHESTER-X0	0x20	PCAL6416A	Address in slot A
CHESTER-X0	0x21	PCAL6416A	Address in slot B
CHESTER-R1	0x38	TCA9534A
CHESTER-X6	0x39	TCA9534A
CHESTER-A	0x3a	TCA9534A
CHESTER-G	0x3b	TCA9534A
CHESTER-G	0x3c	TCA9534A
CHESTER-K1	0x3d	TCA9534A
CHESTER-C1	0x3e	TCA9534A
CHESTER-B1	0x3e	TCA9534A
CHESTER-B1	0x3f	TCA9534A
CHESTER-X5	0x40	ADS122C04	Address in slot A
CHESTER-X5	0x41	ADS122C04	Address in slot B
CHESTER-M	0x42	CAM-M8Q
CHESTER-M	0x44	SHT30	Not populated by default
CHESTER-S2	0x45	SHT30	External sensor
CHESTER-X3	0x46	ADS122C04 - CH1	Address in slot A
CHESTER-X3	0x47	ADS122C04 - CH2	Address in slot A
CHESTER-M	0x48	TMP112
CHESTER-X4	0x49	TLA2021
CHESTER-X10	0x49	TLA2024
CHESTER-X3	0x4a	ADS122C04 - CH1	Address in slot B
CHESTER-M	0x4b	TLA2021
CHESTER-V1	0x4c	SC16IS740
CHESTER-X6	0x4d	SC16IS740
CHESTER-B1	0x4e	SC16IS740
CHESTER-X3	0x4f	ADS122C04 - CH2	Address in slot B
CHESTER-X2	0x50	SC16IS740	Address in slot A
CHESTER-X2	0x51	SC16IS740	Address in slot B
CHESTER-M	0x64	ATSHA204A	Removed in CHESTER-M R3.3
People Counter	0x7f	People Counter	Proprietary module of Adastra Labs