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ATA5833 Datasheet(PDF) 9 Page - ATMEL Corporation |
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ATA5833 Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 24 page 9 ATA5831/ATA5832/ATA5833 [SUMMARY DATASHEET] 9285ES–RKE–08/14 In this application, an LED is connected to PB7. Alternatively, an additional wake-up button can be used on PB7 instead of an LED. An LED can also be connected to PB4. However, note the additional pull-down resistor connected in parallel that is needed to prevent transverse currents in OFFMode. This special case only applies to PB4 because of its active input characteristics (PWRON). 1.4.3 Typical 5V Application Circuit with External Microcontroller Figure 1-5. Typical 5V Application Circuit with External Microcontroller Figure 1-5 shows a typical vehicle side application circuit with an external host microcontroller running from a 5V voltage regulator. In contrast to the 3V application with external microcontroller, the pin PB4 (PWRON) is directly connected to VS and the Atmel® ATA5831/2/3 enters the IDLEMode after power-on. In this configuration the Atmel ATA5831/2/3 can work autonomously and the microcontroller stays powered down to keep current consumption low while remaining sensitive to RF telegrams. To achieve a low current in IDLEMode the Atmel ATA5831/2/3 can be configured in the EEPROM to work with the RC oscillators. The Atmel ATA5831/2/3 can also be configured for autonomous multi-channel and multi-application PollingMode. The external microcontroller is notified by an event on pin 28 (EVENT) if an appropriate RF message is received. Until this event, the Atmel ATA5831/2/3 periodically switches to RXMode, checks the different services and channels configured in the EEPROM, and returns to power-down while the external host microcontroller is still in deep sleep mode to keep average current low. Once a valid RF message is detected, it can be buffered inside of the Atmel ATA5831/2/3 to enable a microcontroller wake-up and retrieval of buffered data. In applications using the 2.4V to 5.5V supply (VS) it is important to note that only Atmel ATA5831/2/3 ports PB0..PB7, PC0..PC5, and the external host microcontroller use this supply. The power amplifier of the Atmel ATA5831/2/3 is limited to 3.6V, therefore, an internal LDO delivers 2.2V or 3.0V supply voltage in TXMode on pin VS_PA. The capacitor on pin VS_PA is needed to stabilize this regulator and decouple the power amplifier supply voltage. The ports PC0..PC5 have internal 50k Ω pull-up resistors and can be left open. The ANT_TUNE pin must be left open. As in the 3V applications, RF_OUT and RF_IN are matched to SPDT_TX and SPDT_RX by absorbing the parasitics of the SPDT switch into the matching network, hence the SPDT_ANT is a 50 Ω Rx and Tx port. The harmonic suppression can be improved by using an optional filter on the antenna side. RFIN_LB IRQ NSS MISO MOSI SCK VDD CLK_IN ATEST _IO1 ATEST _IO2 TEST _EN RFIN_HB SPDT_RX SPDT_ANT ANT_TUNE SPDT_TX RF_OUT VS_PA PB2 32 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 31 30 29 28 27 26 25 910 111213 14 15 16 PB1 PB0 DGND DVCC PC5 PC4 PC3 VS = 5V Optional Harmonic Filter VS Microcontroller Atmel ATA5831 ATA5832 ATA5833 |
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Similar Description - ATA5833_14 |
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