SI4322-A1-FT Silicon Laboratories Inc, SI4322-A1-FT Datasheet - Page 13

• Manufacturer Part Number: SI4322-A1-FT
• Description: IC RCVR FSK 915MHZ 3.8V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc
• Type: FSK Receiverr

Specifications of SI4322-A1-FT

• Package / Case: 16-TSSOP
• Frequency: 868MHz, 915MHz
• Sensitivity: -104dBm
• Data Rate - Maximum: 256 kbps
• Modulation Or Protocol: FSK
• Applications: Remote Control, RKE, Security Systems
• Current - Receiving: 14mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Features: RSSI Equipped
• Voltage - Supply: 2.2 V ~ 3.8 V
• Operating Frequency: 915 MHz
• Operating Supply Voltage: 2.5 V, 3.3 V
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• Supply Current: 12 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Operating Temperature: -
• Memory Size: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed
• Other names: 336-1628-5

Si4322
4.7. Low Battery Voltage Detector
The low battery detector circuit periodically monitors (typ. 8 ms) the supply voltage and generates an interrupt if it
falls below a programmable threshold level.
4.8. Wake-Up Timer
The wake-up timer has very low current consumption (5 µA max) and can be programmed from 1 ms to several
hours.
It calibrates itself to the crystal oscillator at every startup and then at every 30 seconds with an accuracy of ±0.5%.
When the crystal oscillator is switched off, the calibration circuit switches it back on only long enough for a quick
calibration (a few milliseconds) to facilitate accurate wake-up timing. The periodic auto-calibration feature can be
turned off.
4.9. Event Handling
In order to minimize current consumption, the receiver supports sleep mode. Active mode can be initiated by
setting the ex or en bits (in "5.3. Configuration Setting Command" on page 16 or "5.5. Receiver Setting Command"
on page 18).
The Si4322 generates an interrupt signal on several events (wake-up timer timeout, low supply voltage detection,
on-chip FIFO filled up). This signal can be used to wake up the microcontroller, effectively reducing the period the
microcontroller has to be active. The cause of the interrupt can be read out from the receiver by the microcontroller
through the SDO pin.
4.10. Interface and Controller
An SPI compatible serial interface lets the user select the frequency band, center frequency of the synthesizer, and
the bandwidth of the baseband signal path. Division ratio for the microcontroller clock, wake-up timer period, and
low supply voltage detector threshold are also programmable. Any of these auxiliary functions can be disabled
when not needed. All parameters are set to default after power-on; the programmed values are retained during
sleep mode. The interface supports the read-out of a status register, providing detailed information about the status
of the receiver and the received data. It is also possible to store the received data bits into the 64-bit RX FIFO
register and read them out in a buffered mode. FIFO mode can be enabled through the SPI compatible interface by
setting the fe bit to 1 in the
. During FIFO read the crystal oscillator must be
"5.14. FIFO Settings Command" on page 25
ON.
Rev. 1.2
13