M365BLE - etransport/ninebot-docs GitHub Wiki

Xiaomi M365 BLE (Head board)

Hardware

Ref	Name	Manufacturer	Function
U1	nRF51822	Nordic Semiconductor	Cortex-M0 MCU with BLE
U1	?	?	3.3V LDO "L323"
U4	?	?	CC step-up white LED driver (5V->up to 36V)

U1 LDO alternatives

SGM2019-3.3 "YJ33"

U4 alternatives

The U4 wasn't identified yet. The list below contains pin- and Vref-compatible alternatives:

Name	Marking	Tested
AP3032	GJL	+
HT7938	7938	-
HT7939	7939	-
HT7939A-1	39A-1	-
HT7939A-2	39A-2	-
DIO5661	61YW	-
SP6699	PB	-
MT9201	B9HBxx	+ Used in Aliexpress clones
WD3139	B39F	-
SGM3732	SKAxx	-
MP3302	?	-

MCU I/O ports

I/O	Pin	Mode	Periph	Function
AIN3	6	AIN	ADC	Throttle position sensor
AIN4	7	AIN	ADC	Brake position sensor
AIN5	8	AIN	ADC	ACH3
AIN6	9	AIN	ADC	ACH0
P0.09	15	O	GPIO	Beeper
P0.10	16	O	GPIO	Headlight
P0.21	40	O	GPIO	Bar LED 1 green
P0.29	48	O	GPIO	Bar LED 1 white
P0.00	4	O	GPIO	Bar LED 2
P0.30	3	O	GPIO	Bar LED 3
P0.14	20	O	GPIO	Bar LED 4
P0.15	21	IO	UART	Communication bus