TC35680FSG datasheet(34/91 Pages) TOSHIBA

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TC35680FSG-002/TC35681FSG-002

2019-04-04

RF Function

The RF function in TC35680/TC35681 has the following features;



Built-in transmission and reception circuits



Built-in balun



Built-in RF switch circuit



Output power setting



±2 dB (typical) accuracy for the receive signal level

The impedance matching can be done by connecting a proper capacitor between the RFIO pin and GND. The signal of this pin has

a DC bias during communication. It is recommended that a series capacitor should be connected to cut the DC bias. For details,

refer to the design guide in the “Hardware Application Note” of this device.

4.2. Output Power Setting

The output power can be selected from among +8, +7, +6, +4, 0, -6, and -20 dBm (typ.) using the HCI command or the API

“SYS_API_SetTransmitPowerLevel()”. The default value is +8 dBm.

This function can set a specific output power for a recipient device.

The RSSI has an accuracy of ±2 dB (typ.) for the input signal strength in the range of -90 to -10 dBm.

4.3. Auto-advertise Function

The auto-advertise function repeatedly transfers an Advertising packet with very low power consumption (except for Extended

Advertising operation) in the Backup mode.

The auto-advertise function has the following features;



An Advertising packet is transmitted with a set interval time in the Backup mode.



The scan request and the connection request are accepted while this function is executed.



When the scan request is received, a preset scan response data is transmitted by the corresponding hardware.



When the connection request is received, TC35680/TC35681 wakes up from Backup mode and return to Active mode.

Then the software procedure can be executed.



The interval time of the transmission and the transmission count of the Advertising packet can be set. After the set

count of Advertising packets have been transmitted, the CPU starts up.



This function is convenient for the CPU to execute a low frequency procedure such as detection of the low voltage

of a battery and others.

The advertisement count in the Backup mode can be set by the HCI command “HCI_M2_BTL_SET_BACKUP_AUTO_WAKEUP”

or the API “SYS_API_SetDozeLAdverisingCount()”. The set value is 0 to 0xFFFFFFFF. When 0 is set, the advertising continues until

any other factor suspends it. The initial value is 0.

The following conditions are necessary to execute this function.



The conditions to enter the Backup mode are met.



Valid set of conditions to start the auto-advertise are configured and advertising starts.

TC35680FSG Datasheet(PDF) 34 Page - Toshiba Semiconductor

TC35680FSG Datasheet(HTML) 34 Page - Toshiba Semiconductor

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