module boot up process;
“1” - Module boot up not finish.
Can be configured as GPIO.
GPIO
GPIO35
I/O
10
Restore configuration
nReload
I
Module will Restore factory
default configuration after set this
pin “0” more than 3s, then set
“1”.
GPIO
GPIO34
I/O
11
Ethernet Interface
PHY_RX+
I
Ethernet Data Interface, current
driver mode.
12
Ethernet Interface
PHY_RX-
I
13
Ethernet Interface
PHY_TX+
O
14
Ethernet Interface
PHY_TX-
O
Note1: These Pins should not add external pull-up resistor. It's configure pin for module
bootup. There is pull-down resistor for UART_TXD. This pin must keep low when bootup.
High-Flying suggest HF-A11 module better locate in following region at customer board, which to
reduce the effect to antenna and wireless signal, and better consult High-Flying technical people
when you structure your module placement and PCB layout.
Figure 5. Suggested Module Placement Region
1.2.4. External Antenna
HF-A11 modules support internal antenna and external antenna option for user dedicated
application. If user select external antenna, HF-A11 modules must be connected to the 2.4G
antenna according to IEEE 802.11b/g/n standards.
The antenna parameters required as follows:
Table 3 HF-A11 External Antenna Parameters
1.2.5. Evaluation Kit
High-Flying provides the evaluation kit to promote user to familiar the product and develop the
detailed application. The evaluation kit shown as below, user can connect to HF-A21 module with
the RS-232 UART port, 100M Eth port or Wireless port to configure the parameters, manage the
module or do the some functional tests.
Item Parameters
Frequency range 2.4~2.5GHz
Impedance 50 Ohm
VSWR 2 (Max)
Return Loss -10dB (Max)
Connector Type I-PEX or populate directly
There is 100K Ohm pull-up resister internal. When module power up or some issue happened,
MCU need assert nRST signal “0” at least 300ms, then set” 1” to keep module fully reset.
nReady- Module boot up ready signal. Output. Logics “0” effective.
There is 4.7K Ohm pull-up resister internal. The module will output “0” “or “Palmodic Signal” after
normal boot up. This signal used to judge if module finish boot up and ready for application or
working at normal mode.
nLink- Module WIFI connection indication. Output.
There is 4.7K Ohm pull-up resister internal. When module connect to AP (STA mode) or some
WiFi STA connect to module (AP mode), the module will output “0”. This signal used to judge if
module already at WiFi connection status.
nReload- Module restore to factory default configuration.Input. Logics “0” effective.
User can assert nReload signal “0” more than 3’s through button or MCU pin, then release,
module will restore to factory default configuration and re-start boot up process. User need add
4.7K~10K Ohm pull-up resister external the module. If not use this function, then can use AT
command AT+FRLDEN=off to disable it.
UART_TXD/RXD- UART port data transmit and receive signal.
1.4. Typical Application
Refer to HF-A21-SMT user manual for detailed application and module usage.
1. This device complies with Part 15 of the FCC Rules. Operation is subject to the following
two
conditions:
(1) This device may not cause harmful interference, and
(2) This device must accept any interference received, including interference that may cause
undesired operation.
Warning:
compliance could void the user's authority to operate the equipment.
Changes or modifications not expressly approved by the party responsible for
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital
device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide
reasonable
protection against harmful interference in a residential installation.
This equipment generates uses and can radiate radio frequency energy and, if not installed
and
used in accordance with the instructions, may cause harmful interference to radio
communications.
However, there is no guarantee that interference will not occur in a particular installation. If
this
equipment does cause harmful interference to radio or television reception, which can be
determined by turning the equipment off and on, the user is encouraged to try to correct the
interference by one or more of the following measures:
Reorient or relocate the receiving antenna.
Increase the separation between the equipment and receiver.
Connect the equipment into an outlet on a circuit different from that to which the receiver is
connected.
Consult the dealer or an experienced radio/TV technician for help.
FCC Radiation Exposure Statement
This equipment complies with FCC radiation exposure limits set forth for an uncontrolled environment.
This equipment should be installed and operated with minimum distance 20cm between the radiator &
OEM INTEGRATION INSTRUCTIONS:
This device is intended only for OEM integrators under the following conditions: The module must be
installed in the host equipment such that 20 cm is maintained between the antenna and users, and the
transmitter module may not be co-located with any other transmitter or antenna. The module shall
be only used with the internal antenna(s) that has been originally tested and certified with this
module. As long as 3 conditions above are met, further transmitter test will not be required.
However, the OEM integrator is still responsible for testing their end-product for any additional
compliance requirements required with this module installed (for example, digital device emissions, PC
peripheral requirements, etc.).
Validity of using the module certification:
In the event that these conditions cannot be met (for example certain laptop configurations or
co-location with another transmitter), then the FCC authorization for this module in combination
with the host equipment is no longer considered valid and the FCC ID of the module cannot be used
on the final product. In these circumstances, the OEM integrator will be responsible for re-evaluating
the end product (including the transmitter) and obtaining a separate FCC authorization.
End product labeling:
The final end product must be labeled in a visible area with the following: “Contains FCC ID:
2ACSVHF-A21”.
Information that must be placed in the end user manual:
The OEM integrator has to be aware
not to provide information to the end user regarding how to install or remove this RF module in
the user's manual of the end product which integrates this module. The end user manual shall
include all required regulatory information/warning as show in this manual.