ATA5278_06 ATMEL [ATMEL Corporation], ATA5278_06 Datasheet - Page 6
![no-image](/images/no-image-200.jpg)
ATA5278_06
Manufacturer Part Number
ATA5278_06
Description
Stand-alone Antenna Driver
Manufacturer
ATMEL [ATMEL Corporation]
Datasheet
1.ATA5278_06.pdf
(34 pages)
- Current page: 6 of 34
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3.4
6
Oscillator
ATA5278
In case the microcontroller is not able to communicate properly with the ATA5278 or any other
disturbance has occurred, it can trigger a reset (like a power-on-reset, POR) in the chip by pull-
ing the NRES pin to ground, which will bring the logic back to the startup state, i.e., all
configurations are at default and the IC is in power-down mode.
Figure 3-3.
The ATA5278 is equipped with an internal oscillator circuitry that provides the system clock sig-
nal needed for operation. It is intended to work with an externally applied passive reference
device such as a ceramic resonator or a crystal. Active clock sources like microcontrollers or
crystal oscillators, however, can also be used.
oscillator circuitry.
Figure 3-4.
C
in
= 12 pF typ.
Int. state
NRES
S_CS
Pull-down
OSC
External Reset
Internal Oscillator Circuitry
OSCI
f = 8 MHz
X
X
R
fb
= 250 k typ.
POR
t
S1
NRES
Figure 3-4
OSCO
R
shows the internal structure of the
d
C
= 420
Power-down
out
= 12 pF typ.
Clock signal
judging
Enable signal
from SPI
To internal
logic
4832C–RKE–02/06
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