ATA5276M-PGQW Atmel, ATA5276M-PGQW Datasheet - Page 7

• Manufacturer Part Number: ATA5276M-PGQW
• Description: IC XMITTER 125KHZ TPM 20-QFN
• Manufacturer: Atmel

Specifications of ATA5276M-PGQW

• Rf Type: TPM
• Frequency: 125kHz
• Package / Case: 20-VQFN Exposed Pad, 20-HVQFN, 20-SQFN, 20-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -

4.4
4.4.1
4.4.2
4.5
4.5.1
4909C–AUTO–01/07
Internal Voltage Regulator and POR
Oscillator and Carrier Frequency Generation
Reset
DIO Interface
Self-oscillating Mode
Figure 4-7.
The various failure types are monitored during transmission in time TFDx (see section
sis and Protection” on page
The IC contains a 5-V regulator. It is used for the supply voltage V
low voltage analog circuits. Additionally, the V
The stabilized voltage is available at pin VCC and must be buffered with an external capacitor.
After power on or after a voltage breakdown the power-on-reset circuit of the IC generates a
reset pulse which sets the logic circuit to a defined initial state. A RESET is generated if the VCC
is below the reset threshold voltage V
The interface can be operated either as a 5-V microcontroller interface or as automotive K-line
interface with the car battery voltage. In which mode it operates must be selected with the VDIO
pin. If it is connected to 5V the DIO pin operates as microcontroller interface and if it is con-
nected with the battery voltage it operates as automotive interface according to the K-line
specification.
A Voltage Controlled Oscillator (VCO) is used to clock the interface logic and the gate driver
logic. The antenna driver output signal DRV is derived from this clock. The VCO operates in two
modes: the self-oscillation mode with clock CLK
CLK
If the antenna half-bridge is not activated the VCO is in self-oscillating mode. It runs at a center
frequency CLK
reference resistor has to be applied to pin REXT. The resistor at pin REXT determines the VCO
frequency proportionally. The recommended value is 100 k achieving 125 kHz oscillator
frequency.
RT
.
Transmission Acknowledge and Error Signal
SO
DIO
DRV
COIL
of typically 125 kHz with an accuracy of ±8%. For that purpose, an external
8). The time TFDx depends on the antenna resonance frequency.
Time Out
TOUT_H
POR
Acknowledge
TACK
and after power on.
CC
SO
can be used externally for loads up to 10 mA.
and the resonance tracking mode with clock
TDFx
Failure Detection
Failure
Time Out
TOUT_H
CC
of the logic circuits and the
Error Signal
TERR
ATA5276
“Diagno-
7