MAX1458 データシートの表示（PDF） - Maxim Integrated

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MAX1458

1%-Accurate, Digitally Trimmed Sensor Signal Conditioner

Maxim Integrated 

MAX1458

1%-Accurate, Digitally Trimmed

Sensor Signal Conditioner

addition, the EEPROM should only be written to at TA =

+25°C and VDD = 5V.

Writing to the internal EEPROM is a time-consuming

process and should only be required once. All calibra-

tion/ compensation coefficients are determined by writing

directly to the DAC and configuration registers. Use the

following procedure to write these calibration/compensa-

tion coefficients to the EEPROM:

1) Issue an ERASE EEPROM command.

2) Wait 50ms (tWRITE).

3) Issue on END EEPROM WRITE command at address

00h.

4) Wait 1ms (tWAIT).

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 calibration/

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 command

has been issued, the DIO lines become an output and the

state of the addressed EEPROM location will be available

on DIO 200μs (tREAD) after the falling 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.

SCLK

DIO

SCLK

DATA

COMMAND

LSB

MSB LSB

MSB

A0 A1 A2 A3 A4 A5 A6 0 0 0 0 0 0 1 0 0

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

LSB

MSB

DATA

COMMAND

LSB

MSB LSB

MSB

DIO A0 A1 A2 A3 A4 A5 A6 0 0 0 0 0 1 0 1 0

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

LSB

MSB

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

CS

tMIN = 200µs

16 CLOCK CYCLES

SCLK

tREAD

DIO

X

1 0 1 0 U 0 A0 A1 A2 A3 A4 A5 A6 0 0 0 0 0 1 1 0 0 X EE DATA

X

INIT SEQUENCE

READ EEPROM AT ADDRESS COMMAND

DIO IS AN INPUT PIN

DIO IS AN

OUTPUT PIN

Figure 8. READ EEPROM Timing Diagram

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