ATA5279_10 ATMEL [ATMEL Corporation], ATA5279_10 Datasheet - Page 6

• Manufacturer Part Number: ATA5279_10
• Description: Antenna Driver for Multiple Antennas
• Manufacturer: ATMEL [ATMEL Corporation]

Table 3-1.
3.3
6
Output
Mode
AxP
AxN
Sine Wave Generator
Others are on High Level
others are on High Level
Selected driver stays on
Atmel ATA5279
Selected driver active
Transmission Mode
Entering by SPI cmd
States of Driver Outputs within Operation Modes
Operation/
low level
(VDS)
The sinusoidal coil-driving signal is internally generated. Its amplitude is dependant on the
measured coil current, and the frequency is derived from the oscillator stage. In conjunction
with the output driver stages, the generated signal is optimized for low harmonic distortions.
The peak-to-peak amplitude of the sinusoidal signal is directly defined by the voltage on the
external integration capacitor connected to the CINT pin. This voltage, with an offset sub-
tracted, is internally used to generate a low-voltage sine wave signal, which is in turn amplified
and level-shifted up to the desired output level.
The output signal itself has a DC offset close to the half of the supply voltage, and the maxi-
mum possible amplitude has about 3V distance to each of the supplies.
this.
Figure 3-2.
Fault has detected
All high impedance
All high impedance
Shutdown Mode
0.5
Maximum Possible Coil Driving Signal for a Given Supply Voltage VDS
V
V
OUT,max
OUT,min
GND
VDS
VDS
Others are on High Level
Others are on High Level
Selected driver stays on
Selected driver stays on
Entering by S_CS
Vbatt /2 ready for
Idle Mode
Operation
low level
Entering by NRES or
Power Down/Reset
High impedance
High impedance
POC
sources programmable)
sources programmable)
Figure 3-2
(Diagnosis current
(Diagnosis current
Diagnosis Mode
High impedance
High impedance
Entering by SPI
9125I–RKE–09/10
illustrates