4

8393CS-MCU Wireless-09/14

ATmega256/128/64RFR2

Spectrum Signal (DSSS) processing with spreading and despreading. The device is

fully compatible with IEEE802.15.4-2011/2006/2003 and ZigBee standards.

The ATmega256/128/64RFR2 provides the following features: 256K/128K/64K Bytes of

In-System Programmable (ISP) Flash with read-while-write capabilities, 8K/4K/2K Bytes

EEPROM, 32K/16K/8K Bytes SRAM, up to 35 general purpose I/O lines, 32 general

purpose working registers, Real Time Counter (RTC), 6 flexible Timer/Counters with

compare modes and PWM, a 32 bit Timer/Counter, 2 USART, a byte oriented 2-wire

Serial Interface, a 8 channel, 10 bit analog to digital converter (ADC) with an optional

differential input stage with programmable gain, programmable Watchdog Timer with

Internal Oscillator, a SPI serial port, IEEE std. 1149.1 compliant JTAG test interface,

also used for accessing the On-chip Debug system and programming and 6 software

selectable power saving modes.

The Idle mode stops the CPU while allowing the SRAM, Timer/Counters, SPI port, and

interrupt system to continue functioning. The Power-down mode saves the register

contents but freezes the Oscillator, disabling all other chip functions until the next

interrupt or hardware reset. In Power-save mode, the asynchronous timer continues to

run, allowing the user to maintain a timer base while the rest of the device is sleeping.

The ADC Noise Reduction mode stops the CPU and all I/O modules except

asynchronous timer and ADC, to minimize switching noise during ADC conversions. In

Standby mode, the RC oscillator is running while the rest of the device is sleeping. This

allows very fast start-up combined with low power consumption. In Extended Standby

mode, both the main RC oscillator and the asynchronous timer continue to run.

Typical supply current of the microcontroller with CPU clock set to 16MHz and the radio

transceiver for the most important states is shown in the Figure 3-2 below.

Figure 3-2 Radio transceiver and microcontroller (16MHz) supply current

16,6mA

4,7mA

4,1mA

250nA

18,6mA

0

5

10

15

20

Deep Sleep

SLEEP

TRX_OFF

RX_ON

BUSY_TX

Radio transceiver and microcontroller (16MHz) supply current

1.8V

3.0V

3.6V

The transmit output power is set to maximum. If the radio transceiver is in SLEEP mode

the current is dissipated by the AVR microcontroller only.

In Deep Sleep mode all major digital blocks with no data retention requirements are

disconnected from main supply providing a very small leakage current. Watchdog timer,

MAC symbol counter and 32.768kHz oscillator can be configured to continue to run.

700nA

RPC enabled

RPC disabled