ata6286-pnqw ATMEL Corporation, ata6286-pnqw Datasheet - Page 12

• Manufacturer Part Number: ata6286-pnqw
• Description: Ata6285 Tpms Control And Transmitter Ic
• Manufacturer: ATMEL Corporation

4.5.1
4.5.1.1
12
ATA6285/ATA6286 [Preliminary]
Transmission with ENABLE = Open
ASK Mode
With ASK = High the power amplifier is switched on. This is used to perform the ASK modula-
tion. During ASK modulation the IC is enabled with the FSK or the ENABLE pin.
With FSK = Low the switch at pin XTO2 is closed, with FSK = High the switch is open. To
achieve a faster start-up of the crystal oscillator, the FSK pin should be High during start-up of
the XTO because the series resistance of the resonator seen from pin XTO1 is lower if the
switch is off.
The different modes of the ATA6285/ATA6286 are listed in
Table 4-1.
The ATA6285/ATA6286 is activated by ENABLE = open, FSK = High, ASK = Low. The micro-
controller 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 250 µs, the PLL is locked and ready to transmit. The output power can then be
modulated by means of pin ASK. After transmission, ASK is switched to Low and the microcon-
troller returns back to internal clocking. Then, the ATA6285/ATA6286 is switched to power-down
mode with FSK = Low.
Figure 4-2.
ASK Pin
Low
Low
Low
High
High
Low/High
High
ASK
FSK
CLK
Transmitter Part
Timing ASK Mode with ENABLE Open
FSK Pin
Low
Low
High
Low
High
High
Low/High
Power-down
T
ENABLE Pin
Low/open
High
High/open
High/open
High/open
Low
Low
XTO
Power-up,
PA off
> 250 µs
Power-up,
(High)
PA on
Mode
Power-down mode, FSK switch High Z
Power-up, PA off, FSK switch Low Z
Power-up, PA off, FSK switch High Z
Power-up, PA on, FSK switch Low Z
Power-up, PA on, FSK switch High Z
Idle mode, FSK switch High Z
Idle mode, FSK switch High Z
Table
Power-up,
PA off
(Low)
4-1.
Power-down
4958AS–AUTO–09/06