I2C Address Map

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Read this official Leafony page and explain its key points in English. For hardware help, first ask for a photo or the installed leaf models, assembly and power sources, then the goal and tools. Clarify which LED or display changed and whether a cable or leaf was replaced. Do not equate an unseen reset button with an absent one, or I2C acknowledgement with a working display. Verify specifications against sources; distinguish observations from hypotheses. Follow a redirect to its destination; if unreadable, ask for the relevant text instead of guessing.

Page: I2C Address Map

URL: https://docs.leafony.com/en/leaf/i2c-address-map/

Description / headings (excerpt): List of I2C device addresses used on each leaf / Address Map / Remarks / Related Links

This page lists the I2C devices mounted on each leaf and their slave addresses. All addresses are in 7-bit notation.

When multiple leaves are stacked, all of their I2C devices share the same I2C bus (SDA/SCL) on the Leafony Bus. Stacking leaves that use the same address causes bus conflicts, so check the combination before use. When using I2C devices on a home-made leaf, design it so that its addresses do not overlap with the table below, including the reserved addresses.

Address Map

Address	Device	Part Number	Leaf	Notes
0x18	I/O expander	PCA9557RGVR	AX06 Grove&5V	ON/OFF control of the 5V Grove power supply
0x18	Accelerometer	LIS2DW12TR	AI05 Env Sensors (Japanese)	SDO/SA0 tied to GND. Conflicts with AX06
0x19	Accelerometer	LIS2DHTR	AI01 4-Sensors
0x1A	I/O expander	PCA9557RGVR	AI04 LCD	LCD power control and switch input. 0x1E is reserved
0x1B	I/O expander	PCA9557RGVR	AI03 MIC&VR&LED	Power ON/OFF control
0x21	I/O expander	TCA6408ARSVR	AC04 LTE-M King M	LTE-M module control. 0x20 is reserved
0x21	I/O expander	PCAL6408AHKX	AC08 LTE-M Mary	LTE-M module control
0x21	I/O expander	PCAL6408AHKX	AC09 Cat-M1 TY	Cellular LPWA Cat-M1 module control
0x3E	Character LCD	AQM0802A	AI04 LCD
0x40	I/O expander	TCA9536ADTMR	AC06 Wi-Fi Mary	Wi-Fi module control
0x41	I/O expander	TCA9536DGKR	AC07 LoRa Mary	LoRa module control
0x43	I/O expander	TCA9536BDTMR	AV05 Solar Charger
0x44	Temperature/humidity sensor	SHT40-AD1B-R2	AI05 Env Sensors (Japanese)	Optional; not fitted in the standard configuration. Conflicts with AI01’s reserved address
0x45	Illuminance sensor	OPT3001	AI01 4-Sensors	0x44 is reserved
0x50	A/D converter	ADC081C027CIMK	AV01–AV04, AV06 (power leaves)	Battery voltage monitor. 0x51 and 0x52 are reserved
0x50	A/D converter	ADC101C027CIMK	AC05 LTE-M King S	Battery voltage monitor. 0x51 and 0x52 are reserved
0x50	A/D converter	ADC101C027CIMK	AV05 Solar Charger	Battery voltage monitor. 0x51 and 0x52 are reserved
0x59	VOC gas sensor	SGP40-D-R4	AI05 Env Sensors (Japanese)	Optional; not fitted in the standard configuration
0x5F	Temperature/humidity sensor	HTS221TR	AI01 4-Sensors
0x60	Secure element	ATECC608A	AC07 LoRa Mary
0x65	Human detection sensor	AK9754AE	AI02 SP&PIR	0x66 is reserved
0x68	RTC	PCF8523TK	AZ02 RTC&microSD
0x76	Temperature/humidity/pressure sensor / gas sensor	BME280 / BME680	AI05 Env Sensors (Japanese)	BME280 is standard; BME680 is an alternative. Fit only one

Note: AC04–AC06, AI02–AI04, AV02–AV04, AX06, and AZ02 are discontinued products.

Remarks

The AI05 Env Sensors LIS2DW12 and the AX06 Grove&5V I/O expander share 0x18. Do not connect them to the same bus with their standard settings.
If the optional SHT40 is fitted to AI05, its 0x44 conflicts with a selectable address of AI01’s illuminance sensor. AI05 and AI01 also share the D3 interrupt line, so do not use them together without modifications.
Address 0x50 of the battery-monitoring A/D converter is shared by the power leaves (AV01–AV04, AV06), AC05 LTE-M King S, and AV05 Solar Charger. If these leaves are stacked together, the A/D converters cannot be read individually.
Address 0x21 is shared by AC04 LTE-M King M, AC08 LTE-M Mary, and AC09 Cat-M1 TY. Connecting them to the same I2C bus causes an address conflict and prevents individual control of their I/O expanders.
The reserved addresses (0x1E, 0x20, 0x44, 0x51, 0x52, 0x66) are alternate addresses selectable by the address pins of the devices above. Do not use them on home-made leaves either.