User's Manual

6
the IC
6
P0.6
I/O
RESERVED, P0.6, which is connected to P0.6 on
the IC
7
SCK
I/O
Serial peripheral interface clock pin
8
GND
P
Power supply reference ground pin
9
RXD
I/O
UART_RX, which is connected to P0.4 on the IC
10
TXD
Output
UART_TX, which is connected to P0.3 on the IC
11
GND
P
Power supply reference ground pin
12
VCC
P
Power supply pin
13
PRG
I/O
Set high to enter flash programming mode
14
SCK
I/O
Serial peripheral interface clock pin
15
MO
O
Serial peripheral interface data output pin
16
MI
I
Serial peripheral interface data input pin
17
SCN
I/O
Serial peripheral interface Chip selection pin
18
RST
I/O
Hardware reset pin (active at a low level)
19
GND
P
Power supply reference ground pin
20
GND
P
Power supply reference ground pin
Table 1 HM2401 interface pins
3. Integration Instructions
3.1 List of applicable FCC rules
This module has been tested and found to comply with part 15C requirements
for Modular Approval.
3.2 Summarize the specific operational use conditions
This module can be used in DTU, micro-converter and other equipment. The input
voltage to the module should be nominally 1.9~3.6 VDC and the ambient temperature
of the module should not exceed 80℃. HM2401 uses a PCB antenna with max
antenna gain 2dBi. If the antenna needs to be changed, the certification should be
re-applied.