• 07/14/2017
  • Public Content
Contents

Module Sideband and GPIO Control Signals

Sideband signals from the module are used for communicating to, and control of, the expansion board devices.
The PMIC_RESET_N and PMIC_PWRGOOD signals provide module status information to assist debug tasks; it is optional to route these signals on an expansion board or set them as no connect at the module connector if the signals are not used on the expansion board.
The USB signals are necessary to provide connection awareness for various power modes and device state determination.
Signal name
From
To
Connector.Pin
Description
PMIC_PWRBTN_N
Expansion Board
Module
J6.9
Active low output from the expansion board to the module that controls the power state of the module and, by extension, the expansion board, see Power Delivery, Signaling, and Reset for how the PMIC_PWRBTN_N signal controls the module power state based on duration of the low signal.
PMIC_RESET_N
Module
Expansion Board
J6.13
Active low signal output from the module to the expansion board, an expansion board may use this signal to control when the module strapping option signals are driven by the expansion board circuitry. Refer to Power Delivery, Signaling, and Reset for additional details of the PMIC_RESET_N signal.
Leave the PMIC_RESET_N signal floating if not used on the expansion board.
PMIC_PWRGOOD
Module
Expansion Board
J6.33
This power good signal transitions HIGH after the VDD1 and VDD3 supplies are within specification.  Expansion board and mezzanine board designs must ensure that circuitry does not interfere with the state of the compute module boot strap pins. See for an example isolation circuit
.
OTG_EN
Module
USB-C OTG Load Switch
J6.69
Active high, enable 5 V supply for USB OTG
USBC_SEL
Module
Type-C mux
J7.18
Active high or low, Type-C mux port selection signal
VCONN_DCDC_EN
Module
USB-C VCONN Switch
J6.97
Active high, module VCONN input voltage load switch control signal
USB2_ID_PMIC
Expansion Board
Module
J6.20
Active high, indicator for module that a USB OTG cable is connected
Note: Refer to the Compute Module Datasheet Overview for additional electrical specifications.
 

Product and Performance Information

1

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Notice revision #20110804