Rainbow Electronics ATA5812 - Manual (Page 27)

27
ATA5811/ATA5812 [Preliminary]
4689B–RKE–04/04
AVCC is the internal operation voltage of the RF transceiver and is feed via the switch
SW_AVCC by VS1. AVCC must be blocked with a 68 nF capacitor (see Figure 4 on
page 6, Figure 5 on page 7 and Figure 6 on page 8).
DVCC is the internal operation voltage of the digital control logic and is feed via the
switch SW_DVCC by VS1 or VSOUT. DVCC must be blocked on pin DVCC with 68 nF
(see Figure 4 on page 6, Figure 5 on page 7 and Figure 6 on page 8).
Pin VSOUT is a power supply output voltage for external devices (e.g., microcontroller)
and is fed via the switch SW_VSOUT by VS1 or via V_REG2 by the a auxiliary voltage
supply VAUX. The voltage regulator V_REG2 regulates VSOUT to typically 3.25 V. If
the voltage regulator is active a blocking capacitor of 2.2 µF has to be connected to
VSOUT. VSOUT can be switched off by the VSOUT_EN bit in control register 3 and is
then reactivated by conditions found in Figure 22 on page 28.
Pin N_RESET is set to low if the voltage V
VSOUT
at pin VSOUT drops below 2.3 V (typi-
cally) and can be used as a reset signal for a connected microcontroller (see Figure 23
on page 30 and Figure 24 on page 31).
Pin PWR_ON is an input to switch on the transceiver (active high).
Pin T1 to T5 are inputs for push buttons and can also be used to switch on the trans-
ceiver (active low).
For current consumption reasons it is recommended to set T1 to T5 to GND or
PWR_ON to VCC only temporarily. Otherwise an additional current flows.
There are two voltage monitors generating the following signals (see Figure 21 on page
26):
• DVCC_OK if DVCC > 1.5 V typically
• VSOUT_OK if VSOUT > V
Thres1
(2.3 V typically)
• Low_Batt if VSOUT < V
Thres2
(2.38 V typically)