MRF89XA-I/MQ Microchip Technology, MRF89XA-I/MQ Datasheet - Page 69

• Manufacturer Part Number: MRF89XA-I/MQ
• Description: TXRX ISM SUB-GHZ ULP 32QFN
• Manufacturer: Microchip Technology

Specifications of MRF89XA-I/MQ

• Package / Case: 32-WFQFN Exposed Pad
• Frequency: 863MHz ~ 870MHz, 902MHz ~ 928MHz, 950MHz ~ 960MHz
• Data Rate - Maximum: 200kbps
• Modulation Or Protocol: FSK, OOK
• Applications: ISM
• Power - Output: 12.5dBm
• Sensitivity: -113dBm
• Voltage - Supply: 2.1 V ~ 3.6 V
• Current - Receiving: 3mA
• Current - Transmitting: 25mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 1
• Wireless Frequency: 863 MHz to 870 MHz, 902 MHz to 928 MHz, 950 MHz to 960 MHz
• Interface Type: SPI
• Noise Figure: - 112 dBc
• Output Power: - 8.5 dBm, + 12.5 dBm
• Operating Supply Voltage: 2.1 V to 3.6 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Data Rate: 256 Kbps
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

3.4.7.3
The dynamic range of the RSSI is more than 70 dB,
extending from the nominal sensitivity level. The IF
gain, set by the IFGAIN<1:0> bits (DMODREG<1:0>),
is used to achieve this dynamic range.
FIGURE 3-9:
3.4.7.4
The MRF89XA can be used to detect a RSSI level
above a preconfigured threshold. The threshold is set
using RTIVAL<7:0> bits (RSTHIREG<7:0>) and the
IRQ status stored in the RIRQS bit (FTPRIREG<2>),
which is cleared by writing a ‘1’.
FIGURE 3-10:
© 2010 Microchip Technology Inc.
180
160
140
120
100
80
60
40
20
0
-120
RSSIVAL<7:0>
Dynamic Range
RSSI IRQ Source
RIRQS
RSSI DYNAMIC RANGE
RSSI IRQ TIMINGS
-100
24
IF_Gain = 00
26
27
-80
30
IF_Gain = 01
25
RSSI Response
Preliminary
20
Pin [dBm]
20
-60
Clear interrupt
The RSSI response versus the input signal is indepen-
dent of the receiver filter bandwidth. However, in the
absence of any input signal, the minimum value directly
reflects upon the noise floor of the receiver, which is
dependant on the filter bandwidth of the receiver.
Figure 3-9 illustrates the RSSI Dynamic Range
Response.
An interrupt can be mapped to the IRQ0 or IRQ1 pins
through the IRQ0RXS<1:0> and IRQ1RXS<1:0> bits
(FTXRXIREG<7:6>
Figure 3-10 illustrates the timing diagram of the RSSI
interrupt
(RSTHIREG<7:0>) set to ‘11100’.
20
IF_Gain = 10
18
source,
22
-40
33
IF_Gain = 11
20
with
and
22
the
MRF89XA
-20
34
FTXRXIREG<5:4>).
RTIVAL<7:0>
33
DS70622B-page 69
0
bits