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
EEPROM entry point
0000h
Description
0
1
2
3
4
5
6
power-on
0080h
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
0100h
0180h
0200h
0280h
0300h
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
00
00
00
00
00
00
00
C4 CA
1E
00
00
00
00
00
00
00
C8
00
00
00
00
00
00
00
23
00
00
00
00
00
00
00
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
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
Command
Parameter
Related Control Command
Remarks
Crystal – Synthesizer – Power Amplifier auto
on/off mode enable
00–01
C0
C4
Power Management
02–03
04–05
06-07
CA
C8
C4
1E
23
00
Push Button
Bit Rate
Sleep
Continuous execution for all push buttons
BR = 10M / 29 / ( 35+1 ) ~ 9600 bps
Power down
21
SILICON [ SILICON ]
