si4330 Silicon Laboratories, si4330 Datasheet - Page 15

• Manufacturer Part Number: si4330
• Description: Si4330 Ism Receiver
• Manufacturer: Silicon Laboratories

2.1. Operating Modes
The Si4330 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 8 summarizes the modes of operation of the Si4330. 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.
Shutdown
Standby
Receive
Sensor
Tuning
Ready
Name
Mode
Sleep
(Register contents retained)
(Register contents lost)
Digital LDO
OFF
ON
Table 8. Operating Modes
OFF
SPI
ON
ON
ON
ON
ON
ON
Preliminary Rev 0.2
Circuit Blocks
32 kHz OSC
OFF
OFF
ON
X
X
X
X
AUX
OFF
OFF
ON
X
X
X
X
30 MHz
XTAL
OFF
OFF
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
OFF
OFF
PLL
ON
ON
OFF
OFF
OFF
OFF
OFF
OFF
RX
ON
Si4330
18.5 mA
400 nA
800 nA
600 µA
9.5 mA
10 nA
1 µA
I
VDD
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