NRF401 Datasheet, PDF (6/18 Pages) List of Unclassifed Manufacturers – 433MHz Single Chip RF Transceiver

PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
VDD
Std.by to RX
VDD
Std.by to TX
PWR_UP
PWR_UP
TXEN
TXEN
DOUT
DIN
3ms
1ms1ms
ms
0
2
4
ms
0
2
4
(a)
(b)
Figure 5 Timing diagram for nRF401 when going from standby to RX-mode (a) or
TX-mode (b).
Power up to transmit-mode (start-up).
To avoid spurious emission outside the ISM-band when the power supply is switched
on, the TXEN-input must be kept low until the synthesised frequency is stable, see
Figure 6 (a).
When enabling transmit-mode, TXEN-input should be high for at least 1 ms before
data (DIN) is transmitted, see Figure 6 (a).
VDD
VDD=0 to TX
VDD
VDD=0 to RX
PWR_UP
PWR_UP
TXEN
TXEN
DIN
DOUT
3ms 1ms
5ms
ms
0
2
4
(a)
ms
0
2
4
6
(b)
Figure 6. Timing diagram for nRF401 when powering up to TX-mode (a)
or RX-mode (b).
Power up to receive mode (start up).
In transition from power up to receive mode, the receiver may not receive data
(DOUT) until VDD has been stable (VDD > 2.7 V) for at least 5ms, see Figure 6(b).
If an external reference oscillator is used, the receiver may receive data (DOUT) after
3ms.
Nordic VLSI ASA -
Revision: 1.5
Vestre Rosten 81, N-7075 Tiller, Norway -
Page 6 of 18
Phone [phone] - Fax [phone]
May 2000