SCA Functional Specification

Power Management

Last updated: 04-Dec-2024
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Power Management (PM) is a very integral part for the device functionality. The purpose of the Power Management is to minimize the power consumption of devices during its inactive state by using configuration settings and maintaining few best practices. The PM supports different power modes and provides wake-up sources from sleep modes on specified time.

Supported Devices

Power Management is applicable mainly for devices with battery power like:

  • e285
  • e280
  • e235
  • V400m

There are few configurations (based on powermngt_line_powered settings) applicable to Line Powered devices like, M400, P400, P200 M400, v200, v400c.

Power Management States

Power Status List

The following table lists of power management states and related device characteristics.

  

Note

Communication column mentioned in the table below is excluded of Ethernet, as Ethernet cannot be active or powered on in low power modes.

State Name SOC State Communication Peripheral Devices Display
Boot Active On On On
Active Active On On On
Standby Active On On On/Off
Sleep Standby On On On/Off
Deep sleep Deep Sleep On Off Off
Hibernate Hibernate Off Off Off
Reboot Active Off Off Off
Off Off Off Off Off
  

Note

Peripheral Devices means Secondary devices connected with Bluetooth.

Definitions of State Terms

SOC State Name Description
Active Active state of the device with all features available and background operations On. If there is no WiFi activity the WiFi chip will enter Doze mode.
Auto Automatic transition from one state to another, when the device is battery powered.
Boot Device starts or the powered up mode.
Standby This state is to save power when the device is not actively being used. It allows the device to resume its operation quickly, when needed and reducing the power consumption during periods of inactivity.
Sleep This is the inactive state of device, where the device will not be functional with any background operations for the configured time with a Sleep mode screen display.
Deep Sleep Doze mode - The radio, analogue domains, and most of the linear regulators are powered down. The rest of the BCM43455/BCM4343W remains powered up in an IDLE state. All main clocks (PLL, crystal oscillator, or TCXO) are shut down to reduce active power to the minimum. The 32.768 kHz LPO clock is available only for the PMU sequencer. This condition is necessary to allow the PMU sequencer to wake up the chip and transition to Active mode. In Doze mode, the primary power consumed is due to leakage current.
Hibernate Power-down mode—The BCM43455/BCM4343W is effectively powered off by shutting down all internal regulators. The chip is brought out of this mode by external logic re-enabling the internal regulators.
Off The state of the device is powered off.

PM State Availability

VOS2

SOC State Name Battery Powered Line Powered
Boot On On
Active On On
Standby On On
Sleep On On
Deep Sleep On On
Hibernate On On
Reboot On On
Off On On

Wake Up Source

Wake up can be triggered by different wake up sources as per the below table. The following table lists default wake up settings for SCA based on different wake up sources.

Wake Up Sources Default Settings
WiFi Y (Enabled)
Bluetooth Y (Enabled)
Mobile data Y (Enabled)
USB Host N (Disabled)

Configuration

Power Management can be enabled using different configuration based on devices and setting the required parameters in power management configuration files (pm_cfg).

Configuration File Location

Power Management (PM) configuration files are located in pm_cfg-x.xx.x.tgz folder and the locations are provided in the below table.
Based on the user requirement, pm_cfg folder could be consist of different device specific .ini files (like e280.ini, e285.ini, e235.ini,  v400m.ini as in ADK-PM) along with default.ini file. Default .ini file settings are applicable to all devices. However, if any device specific .ini file is present in the package, and the application running on that particular device, will consider the device specific .ini file settings over default.ini file.

Files Defines Location
PM Config Folder Defines the folder, which contain the default and device specific config files as shown in ADK-PM.
  • VOS2: SCA_0_UGP-X.X.XXConfigurationVOS2dl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tgzdl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tarpm_cfg-0.16.1.tgzpm_cfg-0.16.1.taradk_pm_0.16.1.tgzadk_pm_0.16.1.taradk-pm
  • VOS3: SCA_UGP-X.X.XX.X4ConfigurationVOS3dl.UGP_Config_VSP_VOS3-X.X.XX.X.tarPM_Config.csd.tgzPM_Config.csd.tarPM_Config-2.0.0adk-pm
Default Config File Defines the default config settings for required fields of the Config file structure. SCA_0_UGP-X.X.XXConfigurationVOS2dl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tgzdl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tarpm_cfg-0.16.1.tgzpm_cfg-0.16.1.taradk_pm_0.16.1.tgzadk_pm_0.16.1.taradk-pmdefault.ini
Device Specific Config File Defines the device specific config file. For example, if the application is running on e280 device, then this will consider the e280.ini config file details, if present. If the e280.ini config file is not present then the application should consider default.ini file. SCA_0_UGP-X.X.XXConfigurationVOS2dl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tgzdl.SCA_0_UGP_X.X.XX_Config-SI_PROD.tarpm_cfg-0.16.1.tgzpm_cfg-0.16.1.taradk_pm_0.16.1.tgzadk_pm_0.16.1.taradk-pme280.ini

Location of pm-cfg in Configuration folder:

_images/pm_loctn_pm-cfg_folder.png

List Config Files in pm-cfg > adk-pm

_images/pm-cfg_adk-pm.png

Configuration File Structure

Here the default values in the below table are recommended values from Verifone to set in the config file.

Section Field Units Default value Description
powermngt_battery auto bool y Automatic state of transition of the device when it is battery powered. Values are y (enable) and n (disable).
powermngt_battery boot s 60 Timeout for the transition from boot to active when the device is battery powered. Value is in seconds.
powermngt_battery standby s 15 Timeout for transition to standby when the device is battery powered. Value is in seconds.
powermngt_battery sleep s -1 (infinite) Timeout for transition to sleep when the device is battery powered. Value is in seconds.
powermngt_battery deep_sleep s 30 Timeout for transition to deep sleep when the device is battery powered. Value is in seconds.
powermngt_battery hibernate s -1 (infinite) Timeout for transition to hibernate when the device is battery powered. Value is in seconds.
powermngt_battery off s -1 (infinite) Timeout for transition to off when the device is battery powered. Value is in seconds.
powermngt_line_powered auto bool y Automatic state of transition of the device when it is battery powered. Values are y (enable) and n (disable).
powermngt_line_powered boot s 60 Timeout for transition from boot to active when the device is line powered. Value is in seconds.
powermngt_line_powered standby s 15 Timeout for transition to standby when the device is line powered. Value is in seconds.
powermngt_line_powered sleep s -1 (infinite) Timeout for transition to sleep when the device is line powered. Value is in seconds.
powermngt_line_powered deep_sleep s -1 (infinite) Timeout for transition to deep sleep when the device is line powered. Value is in seconds.
powermngt_line_powered hibernate s -1 (infinite) Timeout for transition to hibernate when the device is line powered. Value is in seconds.
powermngt_line_powered off s -1 (infinite) Timeout for transition to off when the device is line powered. Value is in seconds.
battery shutdown_on_critical bool y Automatic shutdown of the device on critical battery level. Values are y (enable) and n (disable).
battery active_while_charging bool y Automatic state of transition to active mode while device is charging. Values are y (enable) and n (disable).
display boot % 50 This backlight level is used in boot state. Allowed values are 1 to 100. 0 is prohibited due to limitation.
display active % 50 This backlight level is used in active state. Allowed values are 1 to 100. 0 is prohibited due to limitation.
display standby % 1 This backlight level is used in standby state. Allowed values are 1 to 100. 0 is prohibited due to limitation.
display sleep % 0 This backlight level is used in sleep state.
display off % 0 This backlight level is used in off state.
display active_during_transition bool n
This is to enable or disable the display during the state of transitions. Values are y (enable) and n (disable).
  • If set to enable, then the display will not be turned off during the transitions.
  • If set to disable, then the display will be turned off during the transitions.
x_key hibernate_delay s -1 (infinite) Duration (in seconds) to hold X key for transition to hibernate (<1 to disable).
x_key powerdown_delay 6 s Duration (in seconds) to hold X key to powerdown the device (<1 to disable).
x_key reboot_delay s -1 (infinite) Duration (in seconds) to hold X key to reboot device (<1 to disable)
x_key pcp_delay s 4 Duration (in seconds) to hold X key to activate Power Control Panel (<1 to disable).
x_key event_delay s 2 Duration (in seconds) to hold X key to send an event that the user is pressing X key (<1 to disable).
o_key reboot_delay s 6 Duration (in seconds) to hold O (green) key to reboot the device (<1 to disable). NOTE: This is applicable to VOS3 only.
power_button power_pcp_delay s 4 Duration (in seconds) to hold Power button to activate Power Control Panel. The duration should be < 6. NOTE: This is applicable to VOS3 only.
wakeup_sources wifi bool y This is to enable or disable WiFi as a wakeup source. Values are y (enable) and n (disable).
wakeup_sources bt bool y This is to enable or disable Bluetooth as a wakeup source. Values are y (enable) and n (disable).
wakeup_sources usb_host bool n This is to enable or disable USB cable as a wakeup source. Values are y (enable) and n (disable).
wakeup_sources mobile_data bool y This is to enable or disable Mobile data as a wakeup source. Values are y (enable) and n (disable).
wakeup_sources proximity bool n This is to enable or disable the proximity as a wakeup source by tapping a CTLS card. Values are y (enable) and n (disable).
pci_reboot reboot bool y This is to enable or disable PCI reboot warning.
pci_reboot pci_wakeup_to_alert bool y This is to enable or disable the terminal waking up to active state to notify on PCI reboot.
pci_reboot alert_start s 300 Timeout before first PCI reboot notification.
pci_reboot interval s 30 Notification interval before PCI reboot.
wake_up_pending_timeout suspend s 5 Abort transition to Sleep or Deep Sleep if the device wake up is pending.
wake_up_pending_timeout hibernate s 20 Abort transition to Hibernate if the device wake up is pending.
power_control_panel sleep bool y This is to show or hide Sleep button in the Power Control Panel. Values are y (enable) and n (disable).
power_control_panel deep_sleep bool y This is to show or hide Deep Sleep button in the Power Control Panel. Values are y (enable) and n (disable).
power_control_panel hibernate bool y This is to show or hide Hibernate button in the Power Control Panel. Values are y (enable) and n (disable).
power_control_panel reboot bool y This is to show or hide Reboot button in the Power Control Panel. Values are y (enable) and n (disable).
power_control_panel off bool y This is to show or hide Off button in the Power Control Panel. Values are y (enable) and n (disable).

SCA Configuration for Battery Threshold

Following configuration settings are provided by SCA application to control the Battery Threshold.

Parameter Name Description Valid/Max Values Default Value Location (Table)
THRESHOLD This parameter is used to set the value for Battery Threshold at which further transactions are not allowed. Numeric, 2 10 (10%) Application
BATTLOWWARNING Battery Threshold at which an unsolicited warning message is sent to POS. Numeric, 2 20 (20%) Application

Wake Up Configuration Settings

Wake up can be triggered by different wake-up sources as per the below table. When device is waking up it will automatically transition to active state. Some wakeup sources can be enabled and disabled in configuration file.

State Name Communication Power User activity - Keypad
  Ethernet WiFi Serial Port Bluetooth Mobile Data USB cable Power Cable Any key Green key
            Host mode Plugged in Plugged out    
Standby             On On On On
Sleep Off On On On On Off On On On On
Deep sleep Off On On On On Off On On On On
Hibernate             On     On
OFF             On     On

SCA Standard - PM and Battery Performance

The recommended power management settings are present in the package contains the default.ini file. Customer specific configuration can be overwritten by having device specific files like e280.ini, v400m.ini files in the config package.

Default PM Config Package: PM_CFG_v0.16.0.tgz
Config Settings:

[powermngt_battery]
auto=y
boot=60
standby=15
sleep=-1
deep_sleep=30
hibernate=-1
off=-1

[powermngt_line_powered]
auto=y
boot=60
standby=15
sleep=-1
deep_sleep=-1
hibernate=-1
off=-1

[battery]
shutdown_on_critical=y
active_while_charging=y

[display]
boot=50
active=5
standby=1
sleep=0
off=0
active_during_transition=n
sensor=n

[x_key]
hibernate_delay = -1
powerdown_delay = 6
reboot_delay = -1
pcp_delay = 4
event_delay = 2

[wakeup_sources]
wifi=y
bt=y
mobile_data=y
usb_host=n

Battery Charging Time

Device Type VHQ Heartbeat Frequency Time taken for 0 to 100% Battery charge
e280 5 mins 133.8 minutes(2.23 hrs)
e285 5 mins 80 minutes(1.33 hrs)
V400M 5 mins 145 minutes (2.42 hrs)

Battery Performance - System Idle

This table provides the details on the time taken to drain entire battery when the device is in Idle state (not performing any transactions)

Device Type VHQ Heartbeat Frequency Time taken to drain from 100% to 10%
e280 5 mins 316 minutes(5.2666 hrs)
e285 15 mins 119 minutes(1 hrs 59 mins)
V400M 5 mins 320 minutes (5.33 hr)

Battery Performance - Continuous Usage

This table provides the details on the time taken to drain entire battery when the device is continuously running the transactions.

Device Type VHQ Heartbeat Frequency Time taken to drain from 100% to 10%
e280 5 mins 223 minutes(3.761 hrs)
e285 15 mins 63 minutes
V400M 5 mins 3 hr 58 mins

Battery Performance - Medium Usage

This table provides the details on the time taken to drain entire battery when the device is doing transactions with medium intervals in between.

Device Type VHQ Heartbeat Frequency Time taken to drain from 100% to 10%
e280 5 mins 252 minutes (4.2 hrs)
e285 15 mins 97 minutes(1.61 hrs)
V400M 5 mins 320 minutes (5.33 hrs)

Battery Performance - Heavy Usage

This table provides the details on the time taken to drain entire battery when the device is doing transactions with less intervals.

Device Type VHQ Heartbeat Frequency Time taken to drain from 100% to 10%
e280 5 mins 220 minutes
e285 15 mins 80 minutes
V400M 5 mins 3 hr and 54 min

Checking Battery Specification

Following are the steps to check Battery Status on the Device:

Device Display Decription
_images/pm_idle_screen.png This is the Idle screen. Press 1 5 9 in keypad devices and the side button in case e280 to access the Control Panel.
_images/pm_control_panel.png Select the Control Panel.
_images/pm_control_panel_battery1.png Select the Battery option from Control Panel.
_images/pm_control_panel_battery2.png
Battery screen displays the details:
  • Available: availability of battery is 1.
  • Voltage: Battery voltage 3900V
  • Capacity: Battery capacity is 1610 mAh.
  • Charging Level: Battery is 80% charged.
  • Temperature: 27o C is displaying as battery temperature.
  • Charging: 0 means not charging and 1 means charging.
  • Powered: 0 means not connected with line powered, and 1 means connected with line powered.
_images/pm_battery_chargng_status.png Displays the battery percentage (79%) and the device is line powered (charging).
_images/pm_battery_low_status.png
Low Battery notification, when the battery level will be less than 25%.
  • The Status Bar displays the Battery % and Battery Icons.
  • Application Level Battery Notifications will be displayed on Idle Screen.

Status Bar for Battery

Icons Decription
_images/pm_battery_icon_normal.png Battery normal
_images/pm_battery_icon_low.png Battery low
_images/pm_battery_icon_fault.png Battery fault
_images/pm_battery_icon_ln_powrd.png Device is line powered

Power Control Panel

Device Display Decription
_images/pm_power_panel.png
  • Using Power Control Panel, the terminal can be forced to change into specific state of Power control like, Sleep/Deep Sleep/hibernate or to reboot/shutdown.
  • To access Power Control Panel, navigate to MAC Menu > Control Panel > Power Panel option.
  • Options appearing on the Power Control Panel are configurable based on the pmcfg.ini file.

Best Practices for Battery Devices

  • It is recommended to avoid the frequent use of Secondary port Status commands for checking the application status. This can cause terminal to wake up from the sleep mode and cause the consumption of battery and eventually reducing the battery level.
  • VHQ Heartbeat frequency should be set to higher duration, example - 60mins, so that the device should not wake up frequently and the consumption of battery can be avoided.
  • It is recommended to avoid VHQ Download with Low Battery level in the devices. VHQ download will not happen, if the battery level is below 15%.
  • This is to ensure that device should be kept active with transaction command only when it is actually being used for the purpose of payment.
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