SI4322-A1-FT Silicon Laboratories Inc, SI4322-A1-FT Datasheet - Page 35

• 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

13.2.1. Software Reset
Software reset can be issued by sending the appropriate control command to the chip. The result of the command
is the same as if power-on reset was occurred but the length of the reset event is much less, 0.25 ms typical. The
software reset works only when the sensitive reset mode is selected.
13.2.2. V
During the reset event (caused by power-on, fast positive spike on the supply line or software reset command), it is
very important to keep the V
supply voltage may prevent the part getting out from reset state. To avoid this phenomenon use adequate filtering
on the power supply line to keep the level of the disturbing signal below 100 mV
200 ms from V
noise may be present on the V
the regulator IC and/or how to shift the switching frequency.
13.2.3. Related Control Commands
Reset Mode Command—Sending D540h command to the chip will change the reset mode to normal from the
default sensitive. Write D500h to the control interface in order to switch back to the sensitive mode.
SW Reset Command—Issuing FF00h command will trigger software reset (sensitive reset mode must be
enabled).
DD
Line Filtering
DD
ramp start. Typical example when a switch-mode regulator is used to supply the radio, switching
output
output
nRes
nRes
250mV
1.6V
V
H
L
V
H
L
dd
dd
Figure 8. Sensitive Reset Enabled, Ripple on V
DD
dd
line as smooth as possible. Noise or periodic disturbing signal superimposed the
line. Follow the manufacturer’s recommendations how to decrease the ripple of
Figure 9. Sensitive Reset Disabled
Reset threshold voltage
Reset threshold voltage
(600mV)
(600mV)
Rev. 1.2
Reset ramp line
(100mV/ms)
Reset ramp line
(100mV/ms)
PP
DD
in the DC – 50 kHz range for
time
time
Si4322
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