RFM24W Datasheet, PDF (15/34 Pages) List of Unclassifed Manufacturers – ISM Transceiver module

RFM24W
3.2. Fast Response Registers
The fast response registers are registers that can be read immediately without the requirement to monitor and
check CTS. There are four fast response registers that can be programmed for a specific function. The fast
response registers can be read through API commands, 0x51 for Fast Response A, 0x53 for Fast Response B,
0x55 for Fast Response C, and 0x57 for Fast Response D. The fast response registers can be configured by the
“FRR_CTL_X_MODE” properties.
The fast response registers may be read in a burst fashion. After the initial 16 clock cycles, each additional 8 clock
cycles will clock out the contents of the next fast response register in a circular fashion
3.3. Operating Modes and Timing
There are four primary states in the Si446x radio state machine: SHUTDOWN, IDLE, TX, and RX (see Figure 6).
The SHUTDOWN state completely shuts down the radio to minimize current consumption. There are five different
configurations/options for the IDLE state which can be selected to optimize the chip to the applications needs. API
commands “Start RX", “Start TX”, and “Change State” control the operating mode/state with the exception of
SHUTDOWN which is controlled by SDN, pin 1. Table 9 shows each of the operating modes with the time required
to reach either RX or TX mode as well as the current consumption of each mode.
Figure 6. State Machine Diagram
Table 9. Operating Modes Response Time and Current Consumption
State/Mode
Response Time to
TX
RX
Current in State
/Mode
(µA)
Shut Down State
20 ms
20 ms
30 nA
Idle States:
Standby Mode
Sleep Mode
SPI Active Mode
Ready Mode
Tune Mode
400 µs
400 µs
320 µs
100 µs
100 µs
400 µs
400 µs
320 µs
100 µs
100 µs
50 nA
900 nA
340 µA
1.8 mA
5 mA
TX State
NA
100 µs
19 mA @ +10 dBm
RX State
100 µs
NA
10 or 13 mA
15
Tel: [phone] Fax: [phone] E-mail: [e-mail] http:/ / www.hoperf.com