SI4021-A1-FT Silicon Laboratories Inc, SI4021-A1-FT Datasheet - Page 14

no-image

SI4021-A1-FT

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

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

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
SI4021-A1-FTR
Manufacturer:
SILICON
Quantity:
5 000
2. Power Management Command
Bits 5-0, enable the corresponding block of the transmitters, i.e. the crystal oscillator is enabled by the ex bit, the synthesizer by es, the
power amplifier by ea and the low battery detector by eb, while the wake-up timer by et. The bit dc disables the clock output buffer.
When receiving the Data Transmit Command, the chip supports automatic on/off control over the crystal oscillator, the PLL and the PA.
If bit a1 is set, the crystal oscillator and the synthesizer are controlled automatically. Data Transmit Command starts up the crystal oscillator
and as soon as a stable reference frequency is available the synthesizer starts. After a subsequent delay to allow locking of the PLL, if a0 is
set the power amplifier is turned on as well.
Note:
Oscillator control logic
bit
15
1
To enable the automatic internal control of the crystal oscillator, the synthesizer and the power amplifier, the corresponding bits
(ex, es, ea) must be zero in the Power Management Command.
In microcontroller mode, the ex bit should be set in the Power Management Command for the correct control of es and ea. The
oscillator can be switched off by clearing the ex bit after the transmission.
In EEPROM operation mode after an identified Data Transmit Command the internal logic switches on the synthesizer and PA. At
the end of Data Transmit Command header if necessary the current clock cycle is automatically extended to ensure the PLL
stabilization and RF power ramp-up.
In EEPROM operation mode the internal logic switches off the PA when the given number of bytes is transmitted. (See: Data
Transmit Command in EEPROM operation.)
When the chip is controlled by a microcontroller, the Sleep Command can be used to indicate the end of the data transmission
process, because in microcontroller mode the Data Transmit Command does not contain the length of the TX data.
For processing the events caused by the peripheral blocks (POR, LBD, wake-up timer, push-buttons) the chip requires operation of
the crystal oscillator. This operation is fully controlled internally, independently from the status of the ex bit, but if the dc bit is zero,
the oscillator remains active until Sleep Command is issued. (This command can be considered as an event controller reset.)
14
1
13
0
12
0
11
0
10
0
9
0
8
0
a1
7
a0
6
ex
5
es
4
ea
3
eb
2
et
1
dc
0
C000h
POR
Si4021
14