MLX90308CCCUD datasheet(18/26 Pages) MICRO-ELECTRONICS

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MLX90308CCC

Programmable Sensor Interface

MLX90308CCC Programmable Sensor Interface

Page 18

Rev 2.2

23/Oct/01

Byte

Designation

Note

PNB_TNB

Number of temperature and pressure gaps. See Tables 4, 5,

and 6, and Figures 3 and 4.

n_factor

Temperature filter coefficient, four LSB's. Four MSB's must

all be zero.

Not used

This byte is not used.

ALARM low trigger

Level1 IO2/IO1

Value below which ALARM will go on.

Value of first level ([IO2, IO1]= 00-01). See Figures 5 & 7.

ALARM low output

Level2 IO2/IO1

Value of DIGMO during “ALARM low” condition.

Value of second level ([IO2,IO1] = 01-10). See Figures 5

and 7

ALARM high trigger

Level3 IO2/IO1

Value above which ALARM will go on.

Value of third level ([IO2,IO1]=10-11). See Figures 5 and 7.

ALARM high out level

Value of DIGMO during “ALARM high” condition. See

Figures 5 and 7.

ALARM control byte

IO1/IO2 control byte

Four LSB's are unused

Three bits needed for choice of input for ALARM detection

(TPO, IAO, GNO, VMO, IO1 or IO2).

Two bits needed for choice of input for LEVEL-steering

(TPO, IAO, GNO or VMO).

The above bits are multiplexed according to the mode. If

both CMO and VMO are active, then alarm is not active.

ClkTC1

Value of Cadj at low temperature (Don’t change; factory set).

ClkTC2

Value of Cadj at mid temperature (Don’t change; factory

set).

ClkTC3

Value of Cadj at high temperature Don’t change; factory set).

Ctemp1

First Cadj temperature point, eight MSB’s of the 10 bit

internal temperature value (set at factory; do not change).

Ctemp2

Second Cadj temperature point, eight MSB’s of the 10 bit

internal temperature value (set at factory; do not change).

37-38

Not used

These bytes are not used by the firmware and are available

to the user.

CLKgntp

Setting for temperature amplifier for clock temperature

adjustment temperature reading (set at factory; do not

change).

40-41

Faultval

Value sent to output if checksum test fails is a 10 bit value.

42-46

Not Used

These bytes are not used by the firmware and are available

to the user.

Checksum

EEPROM checksum; value needed to make all bytes add to

0FFh. Must be set by user if checksum test is active.

Table 11. EEPROM Byte Definitions (continued)

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