POWER
Battery Status LED
42 E355/E265 USER AND BEST PRACTICES GUIDE
• Because of ±3% reading accuracy, the battery may stop charging before
reaching 100% level or it may continue to operate even at 0% level.
• Battery broadcast event, EVT_SYSTEM, is not generated when e355 is in
sleep state. The event is generated after the next wake-up and if the battery is
discharged to a level that is a multiple of 10.
• OS will not notify critical low battery status when e355 is in any sleep mode.
Eventually power down will happen.
• Consider checking battery levels at the beginning and end of transaction flow.
Sleepwalking API
• API set_backlight_control() enables sleep walking.
• This allows application to control display backlight, instead of the OS
controlling display on/off during wake up/sleep.
• Dark wake is possible, backlights are not automatically turned on.
• This is used to address application "heartbeats" packets, when simple ACK is
needed with minimal processing.
• If simple ACK is required, do it and then call SVC_SLEEP(), otherwise, turn
the lights back on and process the next event.
Battery Status
LED
LED is located on the right side of e355, and below the barcode button.
Table 13 LED Color and Cadence Behavior
Condition Color Cadence
Battery Fault
Orange Solid
Battery Low
Red Rapid Blink
Battery Charging
Orange Slow Blink
Awake and Not Charging
Green Solid
Sleep or Off
Off Off
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