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Atmel introduces LIN SBCs, automotive RF chips

Atmel has introduced two LIN system basis chips (SBCs) and three UHF ASK/FSK receiver ICs.

The ATA6623 and ATA6625 LIN system basis chips, designed in compliance with the LIN 2.0 specification and the SAEJ2602 standard, incorporate Atmel's second-generation LIN transceiver, which is said to provide industry-leading EMC performance and excellent ESD stability (>6 kV). Targeting comfort and powertrain applications, the SBCs operate at supply voltages up to 40 V. They are manufactured on Atmel's high-voltage BCD-on-SOI technology (SMARTIS) and come in SO8 power packages.

The LIN devices integrate a low-drop voltage regulator (3.3 V output voltage for the ATA6623 and 5 V for the ATA6625) with the potential to lower system costs by approximately 20% while reducing board space requirements. The silicon-on-insulator substrate used in the SMARTIS process results in low leakage current, reduced crosstalk between the analog and digital circuits on the same die, latch-up-free operation at high temperatures, and lower parasitic effects, for better EMC performance.

Atmel’s ATA5723, ATA5724 and ATA5728 UHF ASK/FSK receiver ICs target remote keyless entry (RKE) and tire pressure monitoring system (TPMS) applications. The devices are pin-compatible and can be used without board design changes for all standard automotive frequency ranges – 313-317 MHz (ATA5723), 432-436 MHz (ATA5724) and 868-870 MHz (ATA5728). The three are manufactured using Atmel's RF BiCMOS process and packaged in a small footprint SSO20.

The new RF ICs are based on Atmel's ATA5743, which features polling mode functionality. Polling features in the ATA5723, ATA5724 and ATA5728 allow the microcontroller to remain in standby mode, enabling low current consumption. Active current consumption is about 8mA in receiving mode. Single-ended RF inputs facilitate adaptation of lambda/4 or printed loop antennas and ease tolerance requirements for RF matching components.
The ATA5723, ATA5724, and ATA5728 support Manchester and Bi-phase coding signals. They provide a logarithmic RSSI output that enables customers to achieve good resolution at low field strengths. Receiving selectivity is based on an integrated image rejection mixer with 30 dB rejection and -113 dBm sensitivity. The devices also integrate an IF filter, low-phase-noise VCO, PLL, and loop filter.

The receiver ICs typically need just 10 passive components, a crystal, and an RF antenna to create a receiver board application. No external filters are needed, and low-cost crystals can be used because of the devices’ large oscillation margins.

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