User's Manual

BL652
Datasheet
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6 HARDWARE INTEGRATION SUGGESTIONS
Circuit
The BL652 is easy to integrate, requiring no external components on your board apart from those which you
require for development and in your end application.
The following are suggestions for your design for the best performance and functionality.
Checklist (for Schematic):
 VCC pins
External power source should be within the operating range, rise time and noise/ripple specification of the
BL652. Add decoupling capacitors for filtering the external source. Power-on reset circuitry within BL652
series module incorporates brown-out detector, thus simplifying your power supply design. Upon
application of power, the internal power-on reset ensures that the module starts correctly.
 VCC and coin-cell operation
With built-in DCDC (operating range 1.7V to 3.6V), reduces the peak current required from a coin-cell
(CR2032), making it easier to use with coin-cell.
 AIN (ADC) and SIO pin IO voltage levels
BL652 SIO voltage levels are at VCC. Ensure input voltage levels into SIO pins are at VCC also (if VCC source is
a battery whose voltage will drop). Ensure ADC pin maximum input voltage for damage is not violated.
 AIN (ADC) impedance and external voltage divider setup
If you need to measure with ADC a voltage higher than 3.6V, you can connect a high impedance voltage
divider to lower the voltage to the ADC input pin.
 JTAG
This is not required as smartBASIC runtime engine firmware can be loaded using the UART. JTAG may be
used if you intend to use Flash Cloning during production to load smartBASIC scripts.
Table 28: BL652-SA on-board chip antenna performance (Antenna Gain, efficiency and S11 (whilst BL652-SA-xx module on DVK-
BL652-xx development board)