ATA5423_06 ATMEL [ATMEL Corporation], ATA5423_06 Datasheet - Page 46

• Manufacturer Part Number: ATA5423_06
• Description: UHF ASK/FSK Transceiver
• Manufacturer: ATMEL [ATMEL Corporation]

7.6
Figure 7-4.
46
Pin PWR_ON
ATA5423/25/28/29
DVCC, AVCC
(Status Register)
Power_On
N_RESET
PWR_ON
Timing Pin PWR_ON, Status Bit Power_On
VSOUT
CLK
IRQ
To switch the transceiver from OFF to IDLE mode, pin PWR_ON must be set to “1” (minimum
0.8
sets pin N_RESET to low, and switches on DVCC, AVCC and the power supply for external
devices VSOUT.
If V
sets the status bit Power_On to “1” and an interrupt is issued (T
After the voltage on pin VSOUT exceeds 2.3V (typically) and the start-up time of the XTO is
elapsed the output clock on pin CLK is available. Because the enabling of pin CLK is asynchro-
nous, the first clock cycle may be incomplete. N_RESET is set to high if V
(typically) and the XTO is settled.
If the transceiver is in any active mode (IDLE, AUX, RX, RX_Polling, TX), a positive edge on pin
PWR_ON sets Power_On to “1” (after T
erates an interrupt. If Power_On is still “1” during the positive edge on pin PWR_ON no interrupt
is issued. Power_On and the interrupt are deleted after reading the status register.
During Power_On = 1, the bits VSOUT_EN and CLK_ON in control register 3 are set to “1”.
Note:
1.5 V (typ)
Mode
OFF
DVCC
×
V
V
Thres_2
VS2
It is not possible to set the transceiver to OFF mode by setting pin PWR_ON to “0”. If pin
PWR_ON is not used, it must be connected to GND.
exceeds 1.5V (typically) and the XTO is settled, the digital control logic is active and
= 2.38 V (typ)
) for at least T
T
T
PWR_ON
PWR_ON_IRQ_1
IDLE
Mode
> T
PWR_ON_IRQ_1
V
Thres_1
PWR_ON
= 2.3 V (typ)
(see
Figure
PWR_ON_IRQ_2
IDLE, AUX, RX, RX Polling, TX
T
7-4). The transceiver recognizes the positive edge,
T
PWR_ON
PWR_ON_IRQ_2
). The state transition Power_On 0 → 1 gen-
> T
PWR_ON_IRQ_2
Mode
PWR_ON_IRQ_1
VSOUT
).
exceeds 2.38V
4841C–WIRE–05/06