SM-C93
SM-C93 User Manual - Rev. First Edition: 1.0 - Last Edition: 1.0 - Author: A.R - Reviewed by M.B. - Copyright © 2021 SECO S.p.A.
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SPIS_MISO: SPI Slave Master In Slave Out, bi-directional data. +1.8V_ALW electrical level
SPIS_MOSI: SPI Slave Master Out Slave In, bi-directional data. +1.8V_ALW electrical level
CHXPMIC_EN: PMIC Enable override active high output signal, +1.8V_ALW electrical level
CHX_RLYSWITCH: Platform level relay switch override active high output signal, +1.8V_ALW electrical level
CHXOKNOX0: Output OK signal of other EHL channel, +1.8V_ALW electrical level
CHXOKNOK1: Output NOK signal of other EHL channel, +1.8V_ALW electrical level
SPIM_CS#: SPI Master chip select active low output, +1.8V_ALW electrical level
SPIM_SCLK: SPI Master clock output, +1.8V_ALW electrical level
SPIM_MISO: SPI Master Master In Slave Out, bi-directional data. +1.8V_ALW electrical level
In addition, SM-C93 does provide additional functional safety functions through following signals:
SPIM_MOSI: SPI Master Master Out Slave In, bi-directional data. +1.8V_ALW electrical level
THERMTRIP: Thermal Trip Output Signal, asserted by the processor to indicate a thermal trip event which may cause severe damage. Active high signal, +3.3V_
RUN electrical level
-up resistor
PROCHOT: Protection Output signal, asserted when the processor temperature monitoring sensor(s) detects that the processor has reached its maximum safe
operating temperature. Active high signal, +3.3V_ RUN electrical level
-up resistor
FUSA_PWRFAIL#: FuSa Power Fail indication output signal. Active low signal, +3.3V_ RUN electrical level
-up resistor
CHXPMICEN: FuSa power input disabling signal, once asserted will disable 5V_DSW input signal. Active high signal,
-down resistor
3.2.1.19
Management pins
A set of signals are used by SM-C93 to communicate with carrier board for power management and indication status. Please refer to SMARC hardware specifications
ver. 2.1 for more detailed informations.
The signals involved are:
VIN_PWR_BAD#: Power Bad indication signal from the Carrier Board, active low signal from a voltage detection circuit
CARRIER_PWR_ON: Power On. Command to the Carrier Board. Output is set to +1.8V_ALW electrical level with a 10k pull-down resistor
CARRIER_STBY#: Stand By command to the Carrier Board. Output, active low signal, is set to +1.8V_ALW electrical level with a 10k pull-down resistor
RESET_OUT#: General Purpose Reset. Output, active low signal, +1.8V_ALW electrical level with a 10k pull-down resistor
RESET_IN#: General Purpose Reset. Input, active low signal, +1.8_ALW electrical level with a 10k pull-up resistor
POWER_BTN#: Power Button. Input, active low signal, +1.8_DSW electrical level with a 10k pull-up resistor
SLEEP#: Sleep indicator from Carrier board. Input, active low signal, +1.8_ALW electrical level with a 10k pull-up resistor
LID#: LID Switch. Input, active low signal, +1.8_ALW electrical level with a 10k pull-up resistor
