Installation Instructions

HST-300 Module Datasheet
Bluetooth 5 LE
July 24, 2019
6.5 Debug & Programming
The HST-300 supports the two pin Serial Wire Debug (SWD) interface and offers flexible and powerful
mechanism for non-intrusive debugging of program code. Breakpoints, single stepping, and instruction trace
capture of code execution flow are part of this support.
6.6 Clocks
The HST-300 Series requires two clocks, a high frequency clock and a low frequency clock.
The high frequency clock is provided on-module by a high-accuracy 32-MHz crystal as required by the
nRF52832 for radio operation.
The low frequency clock can be provided internally by an RC oscillator or synthesized from the fast clock; or
externally by a 32.768 kHz crystal. An external crystal provides the lowest power consumption and greatest
accuracy. Using the internal RC oscillator with calibration provides acceptable performance for BLE
applications at a reduced cost and slight increase in power consumption. Note: the ANT protocol requires the
use of an external crystal.
32.768 kHz Crystal (LFXO)
Symb
ol
Par
ameter
Typ.
Max.
Unit
F
NOM_LFXO
Crys
tal frequency
32.7
68
-
kHz
F
TOL_LF
XO_BLE
Frequency tolerance, BLE applications
-
±250
ppm
C
L_LFX
O
Load Capacitance
-
12.5
pF
C
0_LF
XO
Shunt Cap
acitance
-
2
pF
R
S_LFX
O
Equivalent series resistance
-
100
kΩ
Page
C
pin
Input C
apacitance on XL1 & XL2 pads
4
-
pF
Tabl
e 10 – 32.768 kHz Crystal