MRF49XA-I/ST Microchip Technology, MRF49XA-I/ST Datasheet - Page 42

• Manufacturer Part Number: MRF49XA-I/ST
• Description: IC RF TXRX 433/868/915 16-TSSOP
• Manufacturer: Microchip Technology

Specifications of MRF49XA-I/ST

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FHSS, FSK
• Applications: Home / Industrial Automation, Remote Access, Security Alarms
• Power - Output: 7dbm
• Sensitivity: -110dBm
• Voltage - Supply: 2.2 V ~ 3.8 V
• Current - Receiving: 11mA
• Current - Transmitting: 15mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 1
• Number Of Transmitters: 2
• Wireless Frequency: 433 MHz to 915 MHz
• Output Power: + 7 dBm
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Modulation: FHSS, FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 579-MRF49XA-1/ST

REGISTER 2-16:
EQUATION 2-9:
DS70590B-page 40
MRF49XA
bit 15
bit 7
Legend:
R = Readable bit
-n = Value at POR
bit 15-8
bit 7-5
bit 4
bit 3-0
Note 1:
Threshold Voltage Value = 2.25 + 0.1 x (LBDVB<3:0>)
where:
LBDVB<3:0> is the Decimal Value from 0 to 15.
R/W-1
R/W-0
2:
When the battery level goes down by 50 mV below this value, the LBTD bit (STSREG<10>) is set, indicating
that the battery level is below the programmed threshold. This is useful in monitoring discharge-sensitive
batteries, such as Lithium cells. The low battery detect can be enabled by setting the LBDEN bit
(PMCREG<2>) and can be disabled by clearing the bit.
The low battery threshold value is programmable from 2.2V to 3.8V by using Equation 2-9.
COFSB<2:0>
CCB<15:8>: Command Code bits
The command code bits (11000000b) are serially sent to the microcontroller to identify the bits to be
written in the BCSREG.
COFSB<2:0>: Clock Output Frequency Set bits
These bits set the output clock frequency which can be used to run an external host microcontroller.
111 = 10 MHz
110 = 5 MHz
101 = 3.33 MHz
100 = 2.5 MHz
011 = 2 MHz
010 = 1.66 MHz
001 = 1.25 MHz
000 = 1 MHz
Reserved: Write as ‘0’
LBDVB<3:0>: Low Battery Detect Value bits
These bits set the decimal value to calculate the battery detect threshold voltage level.
R/W-1
R/W-0
BCSREG: BATTERY THRESHOLD DETECT AND CLOCK OUTPUT VALUE SET
REGISTER (POR: 0xC000)
r = reserved bit
W = Writable bit
‘1’ = Bit is set
R/W-0
R/W-0
R/W-0
R/W-0
Preliminary
r
CCB<15:8>
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
R/W-0
R/W-0
R/W-0
R/W-0
LBDVB<3:0>
© 2009 Microchip Technology Inc.
x = Bit is unknown
R/W-0
R/W-0
(1,2)
R/W-0
R/W-0
bit 8
bit 0