On-Board Devices - Cherry theobroma SYSTEMS PX30-mQ7 User Manual

10.3.11 Misc
Signal Type
WDTRIG# I
WDOUT O
SPKR O
GP_PWM_OUT2
BIOS_DISABLE# I
/BOOT_ALT#
THRMTRIP# O
FAN_PWMOUT O
/GP_PWM_OUT1
FAN_TACHOIN I
/GP_TIMER_IN
10.3.12 Power Management
Signal Type
RSTBTN# I
BATLOW# I
WAKE# I
SUS_S3# O
SUS_S5# O
SLP_BTN# I
LID_BTN# I
10.3.13 Power
Signal Nominal Input
VCC 5V
VCC_RTC 3V

10.4 On-board Devices

10.4.1 Power-Manager
The Rockchip RK809-1 is connected to the CPU via I2C:
10.4.2 DDR4
• Up to 4GB RAM of DDR4-1600
10.4.3 eMMC
• eMMC connected through the 8-bit wide SDIO interface EMMC_D on the CPU.
PX30-uQ7 User Manual
© Theobroma Systems Design und Consulting GmbH
Signal Description
Level
3.3V Watchdog trigger signal
3.3V Watchdog event indicator
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 Thermal Trip indicates an overheating condition of the processor. If
'THRMTRIP#' goes active the system immediately transitions to the S5
State (Soft Off)
3.3V PWM output for fan speed control. Alternate function general purpose
PWM output. Function based on microcontroller firmware
3.3V Fan tachometer input. Alternate function general purpose 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 transition 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 current: 1.4uA
RK809-1 Pin Function
1 SCL
2 SDA
CPU Pin
I2C0_SCL_u (ball R21)
I2C0_SDA_u (ball M21)
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