SI4421-A1-FT Silicon Laboratories Inc, SI4421-A1-FT Datasheet - Page 26

• Manufacturer Part Number: SI4421-A1-FT
• Description: IC TXRX FSK 915MHZ 3.8V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4421-A1-FT

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Data Rate - Maximum: 256kbps
• Modulation Or Protocol: FSK
• Power - Output: 7dbm
• Sensitivity: -110dBm
• Voltage - Supply: 2.2 V ~ 3.6 V
• Current - Receiving: 15mA
• Current - Transmitting: 28mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Number Of Receivers: 2
• Number Of Transmitters: 2
• Wireless Frequency: 433 MHz to 915 MHz
• Interface Type: SPI
• Output Power: 5 dBm to 7 dBm
• Operating Supply Voltage: 2.2 V to 3.8 V
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Maximum Supply Current: 25 mA
• Minimum Operating Temperature: - 40 C
• Modulation: FSK
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1631-5

Application Proposal for LPDM (Low Power Duty-Cycle Mode) Receivers:
16. Low Battery Detector and Microcontroller Clock Divider Command
The 4-bit parameter (v3 to v0) represents the value V, which defines the threshold voltage V
V
Clock divider configuration:
The low battery detector and the clock output can be enabled or disabled by bits eb and dc, respectively, using the Power
Management Command (page 15).
lb
= 2.25 + V · 0.1 [V]
Bit
15
1
14
1
13
0
12
0
11
0
10
0
9
0
d2
0
0
0
0
1
1
1
1
8
0
d1
0
0
1
1
0
0
1
1
d2
7
d0
0
1
0
1
0
1
0
1
d1
6
Frequency [MHz]
Clock Output
d0
5
10
1
1.25
1.66
2
2.5
3.33
5
4
0
v3
3
v2
2
lb
of the detector:
v1
1
v0
0
C000h
POR
Si4421
26