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3.14.6 Under Voltage and Over Voltage Protection in Battery
During high or low voltage condition applied to the battery accessory, the
protection circuitry should be triggered. The voltage cutoff level should prevent
damage to the accessory. This is to ensure the circuit will protect the user in the
event that the battery is exposed to a high/low voltage from misuse or an
incorrect charger being used.
3.15 Keyboard Module
Key matrix traces with switch contact fingers are laid out and routed on a 3 layers
membrane sheet and scissor keycap as a key module. The contact resistance is
less than 1000 ohm.
3.16 Key Functional Test
Refer to Key Layout and to use Bluetooth test program & fixture.
3.17 Bluetooth RF Power & Frequency Test
RF Power Range: -35dBm ~ -5 dBm
Frequency tolerance: +/- 75 KHz
Low Frequency: 2402 MHz
Middle Frequency: 2441 MHz
High Frequency: 2448 MHz
3.17.1 HID-Master / Slaves Roles
The Limitless Keyboard must be connected as slave to Bluetooth Master(s).
3.17.2 HID Discovery
The Limitless Keyboard must be available in discovery mode in order to connect
to any host.
3.17.3 HID-Connectivity
The Limitless Keyboard must get connected automatically to Host after once it is
discovered by the Host. Limitless keyboard has one to one pairing at each BT
channel. Once connected, the Limitless Keyboard should not be discoverable by
any other BT devices. With 3 channels of connectivity, the host will only be able
to discover the keyboard when the specific channel previously paired to that host
is selected.
3.17.4 Disconnection / Reconnection
The Limitless Keyboard should be able to disconnect from Host and should not
initiate re-connection on its own but only make itself available for connection to
the host by selecting the specific BT channel.
3.17.5 Bluetooth Keyboard – Out of Range / Idle
Out of Range/Link Loss –When Limitless Keyboard goes out of range the host
should terminate the connection. Once the Limitless Keyboard is back in the
range the host should be connected with keyboard automatically if the BT
