MICRF405YML TR Micrel Inc, MICRF405YML TR Datasheet - Page 10

• Manufacturer Part Number: MICRF405YML TR
• Description: 868-915 MHz ISM Band Transmitter
• Manufacturer: Micrel Inc

Specifications of MICRF405YML TR

• Frequency: 290MHz ~ 980MHz
• Applications: ISM
• Modulation Or Protocol: ASK, FSK
• Data Rate - Maximum: 200 kbps
• Power - Output: 10dBm
• Current - Transmitting: 18mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 125°C
• Package / Case: 24-MLF®, QFN
• Operating Temperature (min): -40C
• Operating Temperature (max): 125C
• Operating Temperature Classification: Automotive
• Product Depth (mm): 4mm
• Product Length (mm): 4mm
• Operating Supply Voltage (typ): 2.5/3.3V
• Operating Supply Voltage (max): 3.6V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Lead Free Status / Rohs Status: Compliant
• Other names: 576-1965-2; MICRF405YMLTR; MICRF405YMLTR

In Figure 2, SIO is changed at positive edges of
SCK. The MICRF405 samples the SIO line at
negative edges. The value of the R/W bits is always
“0” for writing.
Writing to All Registers
Writing to all register can be done at any time. To
get the simplest firmware, always write to all
registers. The price to pay for the simplicity is
increased write-time, which leads to increased time
to change the way the MICRF405 works. If data is
transferred through DATAIN pin write address 0-23
(address 24-29 is don’t care). If data is transferred
through SPI write address 0-28 (Address 29 is only
written
configuration).
What to write
Field
Address:
R/W bit:
Values:
How to write:
Refer to Figure 3. Writing to n Registers Having
Incremental Addresses.
April 2006
Micrel
• Bring SEN low
• Use SCK and SIO to clock in the 25/30 octets
• Bring SEN high
Table 5. When writing to All Registers, totally 25/30 (5 are optional) octets are clocked into the MICRF405.
to
during
SCK
SEN
Comments
‘0000000’ (address of the first register to write to, which is 0)
1
so on for all of the octets.
“0” for writing
SIO
st
Octet: wanted values for ControlRegister0. 2
data
transfer,
A6 A5 A4 A3 A2 A1 A0 R/W D7 D6D5 D4 D3 D2 D1 D0
Register address
Figure 2. Writing to One Address.
not
during
10
Writing to n Registers Having Incremental
Addresses
In addition to entering all bytes, it is also possible to
enter a set of n bytes, starting from address i = “A6,
A5, … A0”. Typical example: Clock in a new set of
frequency dividers (i.e. change the RF frequency).
Registers to be written are located in i, i+1, i+2.
nd
Octet: wanted values for ControlRegister1 and
Data to write
into register
Internal load pulse
generated here
MICRF405
[phone]
M9999-041906