ata5428 ATMEL Corporation, ata5428 Datasheet - Page 44

• Manufacturer Part Number: ata5428
• Description: Uhf Ask/fsk Transceiver
• Manufacturer: ATMEL Corporation

7.5
44
Pin Tn
ATA5423/ATA5425/ATA5428/ATA5429
Table 7-22.
To switch the transceiver from OFF to IDLE mode, pin Tn must be set to “0” (maximum
0.2
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 STn 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.
Figure 7-2.
P_On_Aux
Status Bit
Power_On
Low_Batt
DVCC
(Status register)
V
DVCC, AVCC
VS2
exceeds 1.5V (typically) and the XTO is settled, the digital control logic is active and
N_RESET
) for at least T
VSOUT
CLK
STn
IRQ
Tn
Status Register (Continued)
Timing Pin Tn, Status Bit STn
Function
Indicates that the transceiver was woken up by pin PWR_ON (rising edge on pin
PWR_ON). During Power_On = 1, the bits VSOUT_EN and CLK_ON in control register 3
are set to “1”.
(see
Indicates that output voltage on pin VSOUT is too low
(V
(see
Indicates that the auxiliary supply voltage on pin VAUX is high enough to operate.
State transition:
a) OFF mode
b) IDLE mode (VSOUT = VS1)
VSOUT
(see
1.5V (typ)
Mode
Figure 7-4 on page
Figure 7-5 on page
OFF
V
Thres_2
Figure 7-6 on page
< 2.38V typically)
Tn_IRQ
= 2.38V (typ)
T
Mode
IDLE
Tn_IRQ
AUX mode (see
(see
Figure
46)
47)
V
Thres_1
48)
7-2). The transceiver recognizes the negative edge,
= 2.3V (typ)
Figure 5-2 on page
IDLE mode (VSOUT = V_REG2)
Tn_IRQ
).
32)
VSOUT
exceeds 2.38V
4841D–WIRE–10/07