ATA5771-PXQW Atmel, ATA5771-PXQW Datasheet - Page 108

XMITTR UHF ASK/FSK 868MHZ 24VQFN

ATA5771-PXQW

Manufacturer Part Number
ATA5771-PXQW
Description
XMITTR UHF ASK/FSK 868MHZ 24VQFN
Manufacturer
Atmel
Datasheet

Specifications of ATA5771-PXQW

Frequency
868MHz ~ 928MHz
Modulation Or Protocol
UHF
Power - Output
8dBm
Voltage - Supply
2 V ~ 4 V
Current - Transmitting
9.8mA
Data Interface
PCB, Surface Mount
Memory Size
4kB Flash, 256B EEPROM, 256B SRAM
Antenna Connector
PCB, Surface Mount
Operating Temperature
-40°C ~ 85°C
Package / Case
24-VQFN Exposed Pad, 24-HVQFN, 24-SQFN, 24-DHVQFN
Processor Series
ATA5x
Core
AVR8
Data Bus Width
8 bit
Program Memory Type
Flash
Program Memory Size
4 KB
Data Ram Size
256 B
Interface Type
SPI, USI
Maximum Clock Frequency
4 MHz
Number Of Programmable I/os
12
Number Of Timers
2
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
On-chip Adc
10 bit, 12 Channel
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Applications
-
Sensitivity
-
Data Rate - Maximum
-
Current - Receiving
-
Lead Free Status / Rohs Status
 Details

Available stocks

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Quantity
Price
Part Number:
ATA5771-PXQW
Manufacturer:
ATMEL
Quantity:
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4.16.9.3
108
Atmel ATA5771/73/74
Fast PWM Mode
The fast Pulse Width Modulation or fast PWM mode (WGM13:0 = 5, 6, 7, 14, or 15) provides a
high frequency PWM waveform generation option. The fast PWM differs from the other PWM
options by its single-slope operation. The counter counts from BOTTOM to TOP then restarts
from BOTTOM. In non-inverting Compare Output mode, the Output Compare (OC1x) is
cleared on the compare match between TCNT1 and OCR1x, and set at BOTTOM. In inverting
Compare Output mode output is set on compare match and cleared at BOTTOM. Due to the
single-slope operation, the operating frequency of the fast PWM mode can be twice as high as
the phase correct and phase and frequency correct PWM modes that use dual-slope opera-
tion. This high frequency makes the fast PWM mode well suited for power regulation,
rectification, and DAC applications. High frequency allows physically small sized external
components (coils, capacitors), hence reduces total system cost.
The PWM resolution for fast PWM can be fixed to 8-, 9-, or 10-bit, or defined by either ICR1 or
OCR1A. The minimum resolution allowed is 2-bit (ICR1 or OCR1A set to 0x0003), and the
maximum resolution is 16-bit (ICR1 or OCR1A set to MAX). The PWM resolution in bits can be
calculated by using the following equation:
In fast PWM mode the counter is incremented until the counter value matches either one of
the fixed values 0x00FF, 0x01FF, or 0x03FF (WGM13:0 = 5, 6, or 7), the value in ICR1
(WGM13:0 = 14), or the value in OCR1A (WGM13:0 = 15). The counter is then cleared at the
following timer clock cycle. The timing diagram for the fast PWM mode is shown in
4-43. The figure shows fast PWM mode when OCR1A or ICR1 is used to define TOP. The
TCNT1 value is in the timing diagram shown as a histogram for illustrating the single-slope
operation. The diagram includes non-inverted and inverted PWM outputs. The small horizontal
line marks on the TCNT1 slopes represent compare matches between OCR1x and TCNT1.
The OC1x interrupt flag will be set when a compare match occurs.
Figure 4-43. Fast PWM Mode, Timing Diagram
The Timer/Counter Overflow Flag (TOV1) is set each time the counter reaches TOP. In addi-
tion the OC1A or ICF1 flag is set at the same timer clock cycle as TOV1 is set when either
OCR1A or ICR1 is used for defining the TOP value. If one of the interrupts are enabled, the
interrupt handler routine can be used for updating the TOP and compare values.
TCNTn
OCnx
OCnx
Period
1
2
3
R
FPWM
4
=
5
log
---------------------------------- -
6
log
TOP
2
7
+
1
8
OCRnx/TOP Update and
TOVn Interrupt Flag Set and
OCnA Interrupt Flag Set
or ICFn Interrupt Flag Set
(Interrupt on TOP)
(COMnx1:0 = 2)
(COMnx1:0 = 3)
9137E–RKE–12/10
Figure

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