Seco Qseven Q7-974 User Manual page 43

Rel. 2.0 comliant module with the intel bay trail family system-on-chips

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3.2.3.15

Miscellaneous signals

Here following, a list of Qseven

compliant signals that complete the features of Q7-974 module.

SMB_CLK: SM Bus control clock line for System Management. Bidirectional signal, electrical level +3.3V_A (but enabled via +3.3V_S voltage) with a 2k2Ω pull-up

resistor. It is managed by Intel

Atom E38xx SOCs' PCU System Management Bus controller.

SMB_DAT: SM Bus control data line for System Management. Bidirectional signal, electrical level +3.3V_A (but enabled via +3.3V_S voltage) with a 2k2Ω pull-up

resistor. It is managed by Intel

Atom E38xx SOCs' PCU System Management Bus controller.

SMB_ALERT#: SM Bus Alert line for System Management. Bidirectional signal, electrical level +3.3V_A with a 10kΩ pull-up resistor. It is managed by Intel

E38xx SOCs' PCU System Management Bus controller. Any device place on the SM Bus can drive this signal low to signal an event on the bus itself.

GP0_I2C_CLK: general purpose I2C Bus clock line. Bidirectional signal, electrical level +3.3V_S with a 560Ω pull-up resistor. It is managed by Intel

SOCs' I2C controller #0. I2C Bus is able to work in Standard mode (bitrate up to 100Kbps), Fast mode (bitrate up to 400Kbps), Fast-mode Plus (bitrate up to

1Mbps), High-speed mode (bitrate up to 3.4Mbps).

GP0_I2C_DAT: general purpose I2C Bus data line. Bidirectional signal, electrical level +3.3V_S with a 560Ω pull-up resistor. It is managed by Intel

SOCs' I2C controller #0.

WDTRIG#: Watchdog Trigger Input. It is an active low signal, +3.3V_S voltage, with 1kΩ pull-up resistor. This signal can be used to reset and restart, via

Hardware, the internal Watchdog Timer (which is usually managed via Software using Q7-974 dedicated API - Application Program Interface - libraries).

WDOUT: Watchdog event indicator Output. It is an active high signal, +3.3V_S voltage. When this signal goes high (active), it reports out to the devices on the

Carrier board that internal Watchdog's timer expired without being triggered, neither via HW nor via SW.

THRM#: Thermal Alarm Input. Active Low +3.3V_S voltage signal with 10kΩ pull-up resistor, directly managed by ST Microelectronics STM32F100R4H6

microcontroller. This input gives the possibility, to carrier board's hardware, to indicate to the main module an overheating situation, so that the SoC can begin

thermal throttling.

FAN_TACHOIN: External FAN Tachometer Input. +3.3V_S voltage signal, directly managed by ST Microelectronics STM32F100R4H6 microcontroller.

FAN_PWM_OUT: PWM output for FAN speed management, +3.3V_S voltage signal. It is managed by ST Microelectronics STM32F100R4H6 microcontroller.

SPKR: Speaker output, +3.3V_S voltage signal, directly managed by Intel

Q7-974

Atom E38xx SOCs' embedded 8254 Timer.

Atom

Atom E38xx

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