AT86RF233 datasheet(29/225 Pages) ATMEL

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MCU Wireless AT86RF233 [PRELIMINARY DATASHEET]

Atmel-8351E-MCU_Wireless-AT86RF233_Datasheet_072014

6.6 Sleep/Wake-up and Transmit Signal (SLP_TR)

Pin 11 (SLP_TR) is a multi-functional pin. Its function relates to the current state of the

Atmel AT86RF233 and is summarized in Table 6-9. The radio transceiver states are

explained in detail in Chapter 7.

Table 6-9. SLP_TR Multi-functional Pin.

Transceiver Status

Function

Transition Description

PLL_ON

TX start

L  H

Starts frame transmission

TX_ARET_ON

TX start

L  H

Starts TX_ARET transaction

BUSY_RX_AACK

TX start

L  H

Starts ACK transmission during RX_AACK slotted operation, see

Section 7.2.3.4

TRX_OFF

Sleep

L  H

Takes the radio transceiver into SLEEP state, CLKM disabled

PREP_DEEP_SLEEP

Deep Sleep

L  H

Takes the radio transceiver into DEEP_SLEEP state, CLKM disabled

SLEEP

Wakeup

H  L

Takes the radio transceiver back into TRX_OFF state, level sensitive

DEEP_SLEEP

Wakeup

H  L

Takes the radio transceiver back into TRX_OFF state, level sensitive

In states PLL_ON and TX_ARET_ON, pin 11 (SLP_TR) is used as trigger input to

initiate a TX transaction. Here SLP_TR is sensitive on rising edge only.

After initiating a state change by a rising edge at pin 11 (SLP_TR) in radio transceiver

states TRX_OFF or PREP_DEEP_SLEEP, the radio transceiver remains in the new

state as long as the pin is logical high and returns to the preceding state with the falling

edge.

SLEEP state

The SLEEP state is used when radio transceiver functionality is not required, and thus

the AT86RF233 can be powered down to reduce the overall power consumption.

A power-down scenario is shown in Figure 6-20. When the radio transceiver is in

TRX_OFF state the microcontroller forces the AT86RF233 to SLEEP by setting

SLP_TR = H. If pin 17 (CLKM) provides a clock to the microcontroller this clock is

switched off after 35 CLKM cycles. This enables a microcontroller in a synchronous

system to complete its power-down routine and prevent deadlock situations. The

AT86RF233 awakes when the microcontroller releases pin 11 (SLP_TR). This concept

provides the lowest possible power consumption.

The CLKM clock frequency settings for 250kHz and 62.5kHz are not intended to directly

clock the microcontroller. When using these clock rates, CLKM is turned off immediately

when entering SLEEP state.

Figure 6-20. Sleep and Wake-up Initiated by Asynchronous Microcontroller Timer.

CLKM

SLP_TR

tTR3 (35 CLKM clock cycles)

CLKM off

tTR1a

async timer elapses

(microcontroller)

Note:

1. Timing figures tTR3 and tTR1a refer to Table 7-1.

AT86RF233 Datasheet(PDF) 29 Page - ATMEL Corporation

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