Compatibility Definition

110-180 Ohm: KEYCODE_VOICE_ASSIST
MUST trigger ACTION_HEADSET_PLUG upon a plug insert, but only after all contacts on
plug are touching their relevant segments on the jack.
MUST be capable of driving at least 150mV ± 10% of output voltage on a 32 Ohm speaker
impedance.
MUST have a microphone bias voltage between 1.8V ~ 2.9V.
7.8.3. Near-Ultrasound
Near-Ultrasound audio is the 18.5 kHz to 20 kHz band. Device implementations MUST correctly report
the support of near-ultrasound audio capability via the AudioManager.getProperty API as follows:
If PROPERTY_SUPPORT_MIC_NEAR_ULTRASOUND is "true", then
The microphone's mean power response in the 18.5 kHz to 20 kHz band MUST
be no more than 15 dB below the response at 2 kHz.
The signal to noise ratio of the microphone MUST be no lower than 80 dB.
If PROPERTY_SUPPORT_SPEAKER_NEAR_ULTRASOUND is "true", then the
speaker's mean response in 18.5 kHz - 20 kHz MUST be no lower than 40 dB below the
response at 2 kHz.
8. Performance and Power
Some minimum performance and power criteria are critical to the user experience and impact the
baseline assumptions developers would have when developing an app. Android Watch devices
SHOULD and other type of device implementations MUST meet the following criteria:
8.1. User Experience Consistency
Device implementations MUST provide a smooth user interface by ensuring a consistent frame rate
and response times for applications and games. Device implementations MUST meet the following
requirements:
Consistent frame latency. Inconsistent frame latency or a delay to render frames MUST
NOT happen more often than 5 frames in a second, and SHOULD be below 1 frames in a
second.
User interface latency. Device implementations MUST ensure low latency user
experience by scrolling a list of 10K list entries as defined by the Android Compatibility
Test Suite (CTS) in less than 36 secs.
Task switching. When multiple applications have been launched, re-launching an
already-running application after it has been launched MUST take less than 1 second.
8.2. File I/O Access Performance
Device implementations MUST ensure internal storage file access performance consistency for read
and write operations.
Sequential write. Device implementations MUST ensure a sequential write performance
of at least 5MB/s for a 256MB file using 10MB write buffer.
Random write. Device implementations MUST ensure a random write performance of at
least 0.5MB/s for a 256MB file using 4KB write buffer.
Sequential read. Device implementations MUST ensure a sequential read performance of
at least 15MB/s for a 256MB file using 10MB write buffer.
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