User's Manual

BL652
Datasheet
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Clocks and Timers
5.2.1 Clocks
The integrated high accuracy 32 MHz (±10 ppm) crystal oscillator helps with radio operation and reducing power
consumption in the active modes.
The integrated on-chip 32.768 kHz RC oscillator (±250 ppm) provides protocol timing and helps with radio power
consumption in the system StandByDoze and Deep Sleep modes by reducing the time that the RX window needs
to be open.
To keep the on-chip 32.768 kHz RC oscillator within ±250 ppm (which is needed to run the BLE stack) accuracy,
RC oscillator needs to be calibrated (which takes 16-17 mS) regularly. The default calibration interval is eight
seconds which is enough to keep within ±250 ppm. The calibration interval ranges from 0.25 seconds to 31.75
seconds (in multiples of 0.25 seconds) and configurable via smartBASIC command at+cfg210.
5.2.2 Timers
In keeping with the event driven paradigm of smartBASIC, the timer subsystem enables smartBASIC applications
to be written which allow future events to be generated based on timeouts.
 Regular Timer – There are eight built-in timers (regular timers) derived from a single RTC clock which are
controlled solely by smart BASIC functions. The resolution of the regular timer is 976 microseconds.
 Tick Timer – A 31-bit free running counter that increments every (1) millisecond. The resolution of this
counter is 488 microseconds. Use the functions GetTickCount() and GetTickSince() to access this counter.
Refer to the smart BASIC User Guide available from the Laird BL652 product page.
Memory for smartBASIC Application Code
You have up to 32 kbytes of data memory available for smart BASIC application script.
Radio Frequency (RF)
 2402–2480 MHz Bluetooth Low Energy radio (one Mbps over the air data rate).
 Tx output power of +4 dBm programmable (via smartBASIC command) to -20 dBm in steps of 4 dB.
 Tx Whisper mode1 -40 dBm (via smartBASIC command).
 Receiver (with integrated channel filters) to achieve maximum sensitivity -96 dBm @ 1 Mbps BLE.
 RF conducted interface available in the following two ways:
– BL652-SA: RF connected to on-board antenna on BL652-SA
– BL652-SC: RF connected to on-board IPEX MH4 RF connector on BL652-SC
 Antenna options:
– Integrated monopole chip antenna on BL652-SA
– External dipole antenna connected with to IPEX MH4 RF connector on BL652-SC
NFC
NFC-A Listen mode compliant:
 Based on NFC forum specification
– 13.56 MHz