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TYPICAL CYCLE, PROGRAMMING THREE WORDS INTO EEPROM

EnterProgramming Sequence

Word0

After8bits,thepayload

dataistransferredto

theRAMandisactive.

Waitforatleast

10msbefore

exitingEEPROM

writephase,for

safeoperation.

Payload

Word1

Payload

Word2

Payload

State

Machine

Jump

State

Machine

Jump

State2 ® State3

State3 ® State1

T0043-02

TYPICAL WRITE/VERIFY/PROGRAM CYCLE

CDCE401

SCAS820 – JUNE 2006

Figure 3 shows an enter register programming mode and how the different words can be written. Bold highlights

the addressing of word0–word2. After that, the payload for the respective word is clocked in. In this example,

this is followed by a jump from state 2

→ state 3 into enter EEPROM programming with EEPROM lock. In the

EEPROM-programming state, it is necessary to wait at least 10 ms for safe programming. The last command is

a jump from state 3 into state 1 (normal operation).

Figure 3. EEPROM Programming Example

As stated previously in this document, for safe writing and programming, the supply voltage must be held within

a narrow window of 3.2 V ±100 mV. Figure 1 illustrates writing to the device and verifying the settings, followed

by a safe programming into EEPROM.

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