NRF401-IC ETC, NRF401-IC Datasheet - Page 6

• Manufacturer Part Number: NRF401-IC
• Description: 433mhz Single Chip RF Transceiver
• Manufacturer: ETC

PRODUCT SPECIFICATION
nRF401 Single Chip RF Transceiver
Std.by to RX
Std.by to TX
VDD
VDD
PWR_UP
PWR_UP
TXEN
TXEN
DOUT
DIN
3ms
1ms
1ms
ms
ms
0
2
4
0
2
4
(b)
(a)
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=0 to TX
VDD=0 to RX
VDD
VDD
PWR_UP
PWR_UP
TXEN
TXEN
DIN
DOUT
3ms
1ms
5ms
ms
ms
0
2
4
0
2
4
6
(b)
(a)
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.
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Revision: 1.5
Page 6 of 18
May 2000