Rainbow-electronics AT86RF211 User Manual download pdf (Page 22)

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 R

POWER

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, V

=3V

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 0 -2 -3

001 4 0 0

010 6 3 2

011 8 5 4

100 10 7 5

101 11 8 7

110 12 9 8

111 13 10 9

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 47 48

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Rainbow-electronics AT86RF211 User Manual Page 22

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