ATA5756-6DQY71 Atmel, ATA5756-6DQY71 Datasheet - Page 6
![RF Transmitter ASK/FSK Transmitter 315MHz TPMS](/photos/30/99/309936/tssop-10_sml.jpg)
ATA5756-6DQY71
Manufacturer Part Number
ATA5756-6DQY71
Description
RF Transmitter ASK/FSK Transmitter 315MHz TPMS
Manufacturer
Atmel
Type
UHF ASK/FSK Transmittersr
Datasheet
1.ATAB5756.pdf
(20 pages)
Specifications of ATA5756-6DQY71
Package / Case
TSSOP-10
Operating Frequency
315 MHz
Maximum Operating Temperature
125 C
Mounting Style
SMD/SMT
Operating Supply Voltage
2 V to 3.6 V
Supply Voltage (max)
3.6 V
Supply Voltage (min)
2 V
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
4.1
4.1.1
4.1.2
6
Transmission with ENABLE = open
ATA5756/ATA5757
ASK Mode
FSK Mode
The ATA5756/ATA5757 is activated by ENABLE = open, FSK = High, ASK = Low. The microcon-
troller is then switched to external clocking. After typically 0.6 ms, the CLK driver is activated
automatically (i.e., the microcontroller waits until the XTO and CLK are ready). After another
time period of
modulated by means of pin ASK. After transmission, ASK is switched to Low and the microcon-
troller returns back to internal clocking. Then, the ATA5756/ATA5757 is switched to power-down
mode with FSK = Low.
Figure 4-1.
The ATA5756/ATA5757 is activated by FSK = High, ASK = Low. The microcontroller is then
switched to external clocking. After typically 0.6 ms, the CLK driver is activated automatically
(i.e., the microcontroller waits until the XTO and CLK are ready. After another time period of
≤
ASK = H. The ATA5756/ATA5757 is then ready for FSK modulation. The microcontroller starts to
switch on and off the capacitor between the crystal load capacitor and GND by means of pin
FSK, thus, changing the reference frequency of the PLL. IF FSK = L the output frequency is
lower, if FSK = H output frequency is higher. After transmission, FSK stays High and ASK is
switched to Low and the microcontroller returns back to internal clocking. Then, the
ATA5756/ATA5757 is switched to power-down mode with FSK = Low.
Figure 4-2.
250 µs, the PLL is locked and ready to transmit. The power amplifier is switched on with
ASK
FSK
CLK
FSK
ASK
CLK
≤
Timing ASK Mode with ENABLE not Connected to the Microcontroller
Timing FSK Mode with ENABLE not Connected to the Microcontroller
Power-down
250 µs, the PLL is locked and ready to transmit. The output power can then be
Power-down
ΔT
ΔT
XTO
Power-up,
XTO
Power-up,
PA off
PA off
> 250 µs
> 250 µs
(f
Power-up,
Power-up,
RF
PA on
PA on
(High)
= High)
(f
Power-up,
Power-up,
RF
PA off
PA off
(Low)
= Low)
Power-down
Power-down
4702J–RKE–09/08