si4430 Silicon Laboratories, si4430 Datasheet - Page 17

• Manufacturer Part Number: si4430
• Description: Si4430 Ism Transceiver
• Manufacturer: Silicon Laboratories

2.1. Operating Modes
The Si4430 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 Si4430. 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.
*Note: 28 mA at +13 dBm.
Shutdown
Transmit
Standby
Receive
Sensor
Tuning
Ready
Name
Mode
Sleep
OFF (Register
contents lost)
ON (Register
Digital LDO
retained)
contents
OFF
SPI
ON
ON
ON
ON
ON
ON
ON
32 kHz OSC
Table 9. Operating Modes
OFF
OFF
ON
X
X
X
X
X
Preliminary Rev. 0.4
Circuit Blocks
AUX
OFF
OFF
ON
X
X
X
X
X
30 MHz
XTAL
OFF
OFF
OFF
OFF
ON
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
PLL
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
PA
OFF
OFF
OFF
OFF
OFF
OFF
OFF
ON
RX
Si4430
18.5 mA
600 µA
28 mA*
400 nA
800 nA
9.5 mA
10 nA
1 µA
I
VDD
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