Cherry PUMA SOM-RK3399-Q7 User Manual page 40

5.4.12 Misc
Signal Type
WDTRIG# I
WDOUT O
SMB_CLK O
GP1_I2C_CLK
SMB_DAT I/O
GP1_I2C_DAT
SMB_ALERT# I
SPKR O
GP_PWM_OUT2
BIOS_DISABLE# I
/BOOT_ALT#
GP_1-Wire_Bus I/O
THRM# I
THRMTRIP# O
FAN_PWMOUT O
/GP_PWM_OUT1
FAN_TACHOIN I
/GP_TIMER_IN
5.4.13 Power Management
Signal Type
RSTBTN# I
BATLOW# I
WAKE# I
SUS_S3# O
SUS_S5# O
SLP_BTN# I
LID_BTN# I
5.4.14 Power
Signal Nominal
Input
VCC 5V
VCC_RTC 3V
v1.6
Page 36
Signal Description
Level
3.3V Watchdog trigger signal
3.3V Watchdog event indicator
3.3V Clock line of System Management Bus. Alternate function I2C
Bus clock line
3.3V Data line of System Management Bus. Alternate function I2C
Bus data line
3.3V System Management Bus Alert input
3.3V PC speaker (buzzer) output. Alternate function general purpose
PWM output
3.3V Disables the onboard bootloader and uses the one the SD card
instead. If no bootloader is available on the SD card it falls back
to USB recovery mode
3.3V General Purpose 1-Wire bus interface
3.3V Thermal Alarm active low signal generated by the external
hardware to indicate an over temperature situation. This sig-
nal can be used to initiate thermal throttling
3.3V Thermal Trip indicates an overheating condition of the proces-
sor. If 'THRMTRIP#' goes active the system immediately tran-
sitions to the S5 State (Soft Off)
3.3V PWM output for fan speed control. Alternate function gen-
eral purpose PWM output. Function based on microcontroller
firmware
3.3V Fan tachometer input.
timer input. Function based on microcontroller firmware
Signal Description
Level
3.3V Reset button input. An active low signal resets the module
3.3V Battery low input
3.3V External system wake event. An active low signal wakes the
module from a sleep state
3.3V Indicated that the system is in suspend to ram (S3)
3.3V Indicated that the system is in soft-off state (S5)
3.3V Sleep button. Signals the system with an falling edge to transi-
tion into sleep or wake from a sleep state
3.3V LID button. Low active signal to detect a LID switch to transition
into sleep or wake from a sleep state
Description
Main supply for the module
Backup supply for the RTC. If not used it can be left unconnected. Typical cur-
rent: 1.4uA
Alternate function general purpose