high. In addition, the EEPROM should only be written to

Writing to the internal EEPROM is a time-consuming

process and should only be required once. All calibra-

tion/compensation coefficients are determined by writ-

ing directly to the DAC and configuration registers. Use

the following procedure to write these calibration/com-

pensation coefficients to the EEPROM:

1)

Issue an ERASE EEPROM command.

2)

3)

Issue on END EEPROM WRITE command at

address 00h.

4)

5)

Issue a BEGIN EEPROM WRITE command

(Figure 7) at the address of the bit to be set.

6)

Wait 50ms.

7)

Issue an END EEPROM WRITE command (Figure 7)

using the same address as in Step 5.

8)

Wait 1ms.

9)

Return to Step 5 until all necessary bits have been

set.

10) Read EEPROM to verify that the correct calibra-

tion/compensation coefficients have been stored.

READ EEPROM Command

The READ EEPROM command returns the bit stored at

the memory location addressed by the lower seven bits

of the data field (A0–A6). The higher bits of the data

field (A7–A11) are ignored. Note that after a read com-

mand has been issued, the DIO lines become an out-

put and the state of the addressed EEPROM location

edge of the 16th SCLK cycle (Figure 8). After issuing

the READ EEPROM command, DIO returns to input

mode on the falling edge of CS. Reading the entire

EEPROM requires the READ EEPROM command be

issued 128 times.

1%-Accurate, Digitally Trimmed

Sensor Signal Conditioner

______________________________________________________________________________________

11

Figure 7. Begin WRITE EEPROM and End WRITE EEPROM Timing Diagrams

SCLK

SCLK

DIO

DATA

LSB

MSB

MSB

LSB

MSB

LSB

COMMAND

DATA

LSB

MSB

MSB

LSB

COMMAND

16-BIT COMMAND WORD – BEGIN EEPROM WRITE AT ADDRESS COMMAND

LSB

MSB

16-BIT COMMAND WORD – END EEPROM WRITE AT ADDRESS COMMAND

A0

A1

A2

A3

A4

A5

A6

0

0

0

0

0

0

0

0

1

DIO

A0

A1

A2

A3

A4

A5

A6

0

0

0

0

0

1

1

0

0

Figure 8. READ EEPROM Timing Diagram

SCLK

CS

DIO

16 CLOCK CYCLES

INIT SEQUENCE

A0

X

1

0

1

0

U

0

A1 A2 A3

A4

A5 A6

0

0

0

0

0

0 0

X

X

EE DATA

DIO IS AN

OUTPUT PIN

1

1

READ EEPROM AT ADDRESS COMMAND

DIO IS AN INPUT PIN