Data Sheet

BLM01 - Data she
et
Page 10 of 15
H
ynall Intell
igent Control Co., Ltd
S
y
m
bol
P
ar
a
m
et
er
M
in
Ty
p
. M
ax
Uni
t
V
IH
Input high vo
ltage
0.7 x VCC - VCC V
V
IL
Input low volta
ge
VSS - 0.3 x VCC V
V
OH
O
u
tp
u
t
h
ig
h
v
o
ltage
V
CC
–
0.
4 - V
CC
V
V
OL
Output low volta
ge
VSS - VSS +0.4 V
R
PU
Pull-up resista
nce
11 13 16 k Ω
R
PD
Pull-down resis
tance
11 13 16 k Ω
Table 5: GPIO
3.4 Peripheral pin assignments
The peripher
als within the BLM01 may be assigned to nearly any of the GPIO pins through the
application. There are some restrictions called out by the nRF52832 product specification. See the
remarks column of Table 2.
3.5 Module reset
GPIO pin P0.21 may be used
for a hardware reset. In order to utilize P0.21 as a hardware reset, the
UICR registers PSELRESET[0] and PSELRESET[1] must be set alike, to the value of 0x7FFFFF15.
When P0.21 is programmed as RESET, the internal pull-up is automatically enabled. Nordic
Semiconductor example applications and development kits program P0.21 as RESET_N.
3.6 Debug and programming
The BLM01 supports th
e 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.
The BLM01 als
o supports ETM and ITM trace. Trace data from the ETM and the ITM is sent to an
external debugger via a 4-bit wide parallel trace port. In addition to parallel trace, the TPIU supports
serial trace via the Serial Wire Output (SWO) trace protocol.
3.7 Clocks
The BLM01 requi
res two clocks, a high frequency clock and a low frequency clock.
The high frequency c
lock is provided on-module by a high-accuracy 32 MHz crystal as required by the
nRF52832 for radio operation.
The low frequency clo
ck 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 Bluetooth low energy applications at a reduced cost and slight increase
in power consumption.
No
t
i
ce
: The ANT protocol re
quires the use of an external crystal.