SI4020 Просмотр технического описания (PDF) - Silicon Laboratories

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SI4020

Universal ISM Band FSK Transmitter

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Si4020

EEPROM MODE

In this mode, the transmitters can operate with a standard at least 1 kbyte serial EEPROM with an SPI interface, and no

microcontroller is necessary. The following events cause wake-up of the device:

Event Number N

0

1

2

3

4

5

6

EEPROM entry point

0000h

0080h

0100h

0180h

0200h

0280h

0300h

Description

power-on

low level on input PB1

low level on input PB2

low level on input PB3

low level on input PB4

low supply voltage level

wake-up timer timeout

After any of these events, the crystal oscillator turns on and the device starts to read bytes from the EEPROM continuously (block

read) starting from address N * 128 (decimal) and executes them as commands as described in the previous section.

Note: Zero bytes can be put in the EEPROM for timing purposes. Never put more than 31 consecutive zero bytes into the EEPROM’s

active region (between the actual entry point and the closing Sleep Command).

Example EEPROM Hex Content

Power-On Reset:

00000000

00000010

00000020

00000030

00000040

00000050

00000060

00000070

C0 C4 CA 1E C8 23 C4 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

Short Explanation:

Data in Address, Command, and Parameter fields are hexadecimal values.

For the detailed description of the control command bits, see previous section.

Address

00–01

02–03

04–05

06-07

Command

C0

CA

C8

C4

Parameter

C4

1E

23

00

Related Control Command

Power Management

Push Button

Bit Rate

Sleep

Remarks

Crystal – Synthesizer – Power Amplifier auto

on/off mode enable

Continuous execution for all push buttons

BR = 10M / 29 / ( 35+1 ) ~ 9600 bps

Power down

21

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