AC4490 User Guide
Version 4.5
Laird Connectivity Solutions Support Center:
http://ews-support.lairdtech.com
16
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Command: <0xCC> <0x24> <Data1> <Data2>
Number of Bytes Returned: 3
Response: <0xCC> <Data1> <Data2>
Parameter Range: <Data1> = Period of PWM, Hex value
<Data2> = Duty Cycle of PWM, Hex value
Data1 = (T
period
* 14.7456
6
)
- 1 ; Where T
period
== Period of the PWM in seconds
255
Data1 value is then converted from decimal to hex
Data2 = DC
percentage
* 255 ; Where DC
percentage
== duty cycle of the PWM in decimal percent (50% = 0.5)
Note: The duty cycle is represented at this pin as an analog voltage. 50% duty cycle is half of 3.3V or
1.65V.
Set Max Power
The OEM Host issues this command to limit the maximum transmit power emitted by the transceiver. This can
be useful to minimize current consumption and satisfy certain regulatory requirements.
Note: The radios are shipped at maximum allowable power.
Command: <0xCC> <0x25> <Max Power>
Number of Bytes Returned: 2
Response: <0xCC> <Max Power>
Parameter Range: <Max Power>= New Max Power setting
Output Power
Table 3: AC4490-200
EEPROM Value
(Hex)
Current (mA)
dBm
mW
0
61
-22
0.01
1
64
-9
0.13
2
65
-3
0.5
3
66
1
1.26
4
67.5
4
2.51
5
70
7
5.01
6
73
9
7.94
7
77
10.5
11.22
8
83
12
15.85
9
88
13.5
22.39
A
93.5
14.5
28.18
B
99
15.5
35.48
C
105
16.5
44.67
D
110.5
17
50.12
E
114.5
17.5
56.23
F
117.5
18.5
70.79
1E
126
19.5
89.13
