SI4020-I1-FT Silicon Laboratories Inc, SI4020-I1-FT Datasheet - Page 16

• Manufacturer Part Number: SI4020-I1-FT
• Description: IC TX FSK 915MHZ 5.4V 16-TSSOP
• Manufacturer: Silicon Laboratories Inc

Specifications of SI4020-I1-FT

• Package / Case: 16-TSSOP
• Frequency: 315MHz, 433MHz, 868MHz, and 915MHz
• Modulation Or Protocol: FSK, OOK
• Data Rate - Maximum: 256 kbps
• Current - Transmitting: 14mA
• 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: 315 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: -
• Power - Output: -
• Applications: -
• Memory Size: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 336-1621-5

6. Low Battery Detector 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>.
8. Push-Button Command
If the corresponding bit was set (b1-b4) the event remains active while the button is pressed. In EEPROM mode, the chip is continuously
performing the routine assigned to the push-button while it is pressed. In microcontroller mode, the chip continuously generates interrupts
on nIRQ until the push-button is released. Weak pull-up currents are switched off when bc is high.
The d0, d1 bits set the de-bouncing time period:
Note:
• Until the de-bouncing time has expired, the crystal oscillator remains switched on, independent of the status of the ex bit in the
If the p4 bit is set, the controller performs the routine assigned to the fourth button when PB1 and PB2 are pressed down
simultaneously. With the addition of this feature, there is a way to build a device that uses 3 buttons, but performs 4 functions.
It is possible to detect multiple pressed push-buttons in both modes. In EEPROM mode the controller executes sequentially all the
routines belonging to the pressed buttons.
bit
bit
bit
Power Management Command. (Because the circuit uses the crystal oscillator signal for timing.)
d1
0
0
1
1
15
15
15
1
1
1
d0
0
1
0
1
V
14
14
14
1
1
1
lb
= 2.25 V + T * 0.1 V
De-bouncing Time [ms]
160
40
10
0 (Bypassed)
13
13
13
0
0
0
12
12
12
0
0
0
11
11
11
0
0
1
10
10
10
0
1
0
9
1
9
0
9
1
8
0
8
0
8
0
s7
p4
7
0
7
7
s6
d1
6
0
6
6
lb
of the detector:
s5
d0
5
0
5
5
s4
b4
t4
4
4
4
s3
b3
t3
3
3
3
s2
b2
t2
2
2
2
s1
b1
t1
1
1
1
s0
bc
t0
0
0
0
C400h
CA00h
C200h
POR
POR
POR
Si4020
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