Manual
RF22
Version: 0.1 Date: 12/23/2008
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7
X1
30MHz
supply voltage
microcontroller
VDD
VSS
GP1
GP2
GP3
GP4
100n
C7
100p
C8
C1
C8
L1
L3L2
C6
C3 C2
1u
1u
R1, L1-L5 and C1-C4 values depend on frequency band,
antenna impedance, output power and supply voltage range.
Programmable load capacitors for X1 are integrated.
VDD_RF
SCLK
91
81
71
61
1
2
3
4
15
14
13
7
8
9
01
SDI
SDO
VDD_D
RXn
TX
RXp
0
O
IP
G
1
O
IP
G
G
ID_RV
Q
RIn
ND
S
TU
O
X
LE
S
n
2
O
IP
G
5
VR_IF
6
FER_
C
DA
GND_D
02
NIX
11
12
C10
GP5
1u
C9
1u
L4
C4
C5
RF22
TR & ANT-DIV
Switch
Figure1. +20dBm Application with Antenna Diversity and FHSS
2.1. Operating Modes
The RF22 provides several modes of operation which can be used to optimize the power consumption of the device
application. Depending upon the system communication protocol, the optimal trade-off between the radio wake time
and power consumption can be achieved.
Table 9 summarizes the modes of operation of the RF22. In general, any given mode of operation may be classified as
an Active mode or a Power Saving mode. The table indicates which block(s) are enabled (active) in each
corresponding mode. With the exception the Shutdown mode, all can be dynamically selected by sending the
appropriate commands over the SPI in order to optimize the average current consumption. An “X” in any cell means
that: in the given mode of operation, that block can be independently programmed to be either ON or OFF, without
noticeably affecting the current consumption. The SPI circuit block includes the SPI interface and the register space.
The 32 kHz OSC circuit block includes the 32.768 kHz RC oscillator or 32.768 kHz crystal oscillator, and wake-up timer.
AUX (Auxiliary Blocks) includes the temperature sensor, general purpose ADC, and low-battery detector.
Table9. Operating Modes
Circuit Blocks
Mode Name
Digital LDO SPI 32 kHz OSC AUX 30 MHz XTAL PLL PA RX I
VDD
Shutdown OFF (Register contents lost) OFF OFF OFF OFF OFF OFF OFF 10 nA
Standby ON (Register contents retained) ON OFF OFF OFF OFF OFF OFF 400 nA
Sleep ON ON X OFF OFF OFF OFF 800 nA
Sensor ON X ON OFF OFF OFF OFF 1 A
Ready ON X X ON OFF OFF OFF 600 A
Tuning ON X X ON ON OFF OFF 9.5 mA
Transmit ON X X ON ON ON OFF 27 mA*
Receive ON X X ON ON OFF ON 18.5 mA
*Note: 27 mA at +11 dBm.