SI4021-A1-FT Silicon Laboratories Inc, SI4021-A1-FT Datasheet - Page 16

• Manufacturer Part Number: SI4021-A1-FT
• Description: IC TX FSK 915MHZ 5.4V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4021-A1-FT

• Package / Case: 16-TSSOP
• Frequency: 433MHz, 868MHz, 915MHz
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 512kbps
• Power - Output: 8dBm
• Current - Transmitting: 24mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2.2 V ~ 5.4 V
• Operating Temperature: -40°C ~ 85°C
• Operating Frequency: 433 MHz to 915 MHz
• Mounting Style: SMD/SMT
• Operating Supply Voltage: 2.2 V to 5.4 V
• Supply Current: 1.5 mA
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1622-5

6. Low Battery Detector Command
Bit 7 <dwc> Disables the Wake-up timer periodical (every 30 second) calibration if this bit is set.
Bit 5 <ebs> Enables the TX bit synchronization circuit. The data rate must be set by the Data Rate Command.
The 5-bit value T of <t4 : t0> determines the threshold voltage V
7. Sleep Command
The effect of this command depends on the Power Management Command. It immediately disables the power amplifier (if a0=1 and ea=0)
and the synthesizer (if a1=1 and es=0). Stops the crystal oscillator after S periods of the microcontroller clock (if a1=1 and ex=0) to enable
the microcontroller to execute all necessary commands before entering sleep mode itself. The 8-bit value S is determined by bits <s7 : s0>.
bit
bit
15
15
1
1
V
lb
14
14
1
1
= 2.25 V + T * 0.1 V
13
13
0
0
12
12
0
0
11
11
0
0
10
10
0
1
9
1
9
0
8
0
8
0
dwc
s7
7
7
lb
of the detector:
s6
6
0
6
ebs
s5
5
5
s4
t4
4
4
s3
t3
3
3
s2
t2
2
2
s1
t1
1
1
s0
t0
0
0
C200h
C410h
POR
POR
Si4021
16