si4021 Silicon Laboratories, si4021 Datasheet - Page 22

• Manufacturer Part Number: si4021
• Description: Si4021 Universal Ism Band Fsk Transmitter
• Manufacturer: Silicon Laboratories

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:
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:
Example EEPROM Hexa Content
Power-On Reset:
Short Explanation:
Data in Address, Command, and Parameter fields are hexadecimal values.
For the detailed description of the control command bits, see previous section.
00000000
00000010
00000020
00000030
00000040
00000050
00000060
00000070
Address
00–01
02–03
04–05
06-07
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).
Command
C0
00
00
00
00
00
00
00
CA
C0
C8
C4
C4
00
00
00
00
00
00
00
CA
00
00
00
00
00
00
00
Event Number N
Parameter
1E
00
00
00
00
00
00
00
C4
1E
23
00
0
1
2
3
4
5
6
C8
00
00
00
00
00
00
00
Related Control Command
Power Management
Push Button
Bit Rate
Sleep
23
00
00
00
00
00
00
00
EEPROM entry point
C4
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
0000h
0080h
0100h
0180h
0200h
0280h
0300h
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
00
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
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
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
IA4221
22