NRF401 Datasheet, PDF (5/18 Pages) List of Unclassifed Manufacturers – 433MHz Single Chip RF Transceiver

PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
IMPORTANT TIMING DATA
Timing information
The timing information for the different operations is summarised in Table 5.
(TX is transmit mode, RX is receive mode and Std.by is Standby mode.)
Change of Mode
TX è RX
RX è TX
Std.byè TX
Std.byè RX
V_DD=0 è TX
V_DD =0 è RX
Name
t_TR
t_RT
t_ST
t_SR
t_VT
t_VR
Max Delay
3ms
1ms
2ms
3ms
4ms
5ms
Condition
Operational
mode
Start-up
Table 5 Switching times for nRF401.
Switching TX ↔ RX (operational mode).
When switching from RX-mode to TX-mode data (DIN) may not be sent before the
TXEN-input has been high for at least 1ms, see Figure 4(a).
When switching from TX-mode to RX-mode the receiver may not receive data
(DOUT) before the TXEN-input has been low for at least 3ms, see Figure 4(b).
RX to TX
VDD
PWR_UP
TXEN
DIN
TX to RX
VDD
PWR_UP
TXEN
DOUT
1ms
ms
0
2
4
(a)
3ms
ms
0
2
4
(b)
Figure 4. Timing diagram for nRF401for switching from RX to TX (a)
and TX to RX (b).
Switching between standby and RX-mode (operational mode).
The time from the PWR_UP input is set to “1”, until the data (DOUT) is valid is t_SR,,
see Table 5. Worst case t_SR is 3ms for nRF401 as can be seen in Figure 5 (a).
Switching between standby and TX-mode (operational mode).
The time from the PWR_UP input is set to “1”, until the synthesised frequency is
stable is t_ST, see Table 5.
Nordic VLSI ASA -
Revision: 1.5
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May 2000