AT86RF211DAI-R datasheet(22/48 Pages) ATMEL

22 / 48 page

AT86RF211

1942C–WIRE–06/02

Figure 28. R

POWER Input Schematic

Note:

Keeping the PA output matched guarantees maximum power efficiency.

Software Control

The power can then be adjusted, from the value set by RPOWER down to a maximum of

12 dB below, by programming the bits 6 to 8 of the CTRL1 register. So, 8 levels are dig-

itally selectable with a variation of the output power. The minimum regulated output

power is set to -10 dBm.

Note:

Unless otherwise specified, typical data given for R

POWER =18kΩ,T =25°C, VCC =3 V

Control Logic

Serial Data Interface

The application microcontroller can control and monitor the AT86RF211 through a syn-

chronous, bidirectional, serial interface made of 3 wires:

•

SLE: enable input

•

SCK: clock input

•

SDATA: data in/out

When SLE = ‘1’, the interface is inhibited, i.e. the SCK and SDATA (in) values are not

propagated into the IC, reducing the power consumption and preventing any risk of par-

asitic write or read cycle.

A “read” or “write” cycle starts when SLE is set to ‘0’ and stops when SLE is set to ‘1’.

Only one operation can be performed in one access cycle: only one register can be

either read or written.

POWER

100

Ω

Table 3. Software Control of the Power Level

TXLVL (CTRL1)

Pout at 433 MHz

(dBm)

Pout at 868 MHz

(dBm)

Pout at 915 MHz

(dBm)

000

-2

-3

001

010

011

100

101

110

111

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