SI4022-A0-FT【PDF 13/20 页】IC TX FSK UNI 868/915MHZ 16TSSOP

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Sheet目录57

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Si4022

bit 15 14 13 12 11 10

POR

C813h

Data Rate Command

The bit rate of the transmitted data stream is determined by the 7-bit value R (bits r6 to r0) and the 1 bit cs.

BR = 10 MHz / 29 / (R+1) / (1 + cs*7)

In the receiver set R according the next function:

R= (10 MHz / 29 /(1 + cs*7)/ BR) 1

Apart from setting custom values, the standard bit rates from 600 bps to 115.2 kbps can be approximated with small error.

bit 15 14 13 12 11 10

POR

d2 d1 d0 elfc t3 t2 t1 t0

C213h

d1 d0

Clock Output

Frequency [MHz]

1.25

1.66

2.5

3.33

Low Battery and Microcontroller Clock Divider Command

The 4-bit value T of t3-t0 determines the threshold voltage of the threshold voltage V

of the detector:

= 2.0 V + T * 0.1 V

Bit 4 <elfc>:

Enables low frequency (32 kHz) microcontroller output clock during sleep mode.

Clock divider configuration (valid only if the crystal oscillator is on):

bit 15 14 13 12 11 10

POR

r0 m7 m6 m5 m4 m3 m2 m1 m0

E196h

bit 15 14 13 12 11 10

POR

d1 d0 m13 m12 m11 m10 m9 m8

C300h

Wake-Up Timer Command

The wake-up time period can be calculated by M <m13 : m0> , R <r3 : r0> and D <d1 : d0>:

wake-up

= M * 2

R-D

Note

Note:" The wake-up timer generates interrupts continuously at the programmed interval while the et bit is set.

Extended Wake-Up Timer Command

These bits can be used for further fine adjustment of the wake-up timer. The explanation of the bits can be found above.

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