LM89 datasheet(20/40 Pages) TI2

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LM89

SNIS128D – AUGUST 2002 – REVISED JUNE 2014

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Command Select Address

Power-On-Default State

Name

Read Address

Write Address

<D7:D0> binary

<D7:D0>

<P7:P0> hex

decimal

21h

0000 1010

T_CRIT Hysteresis

B0h-BEh

Manufacturers Test Registers

BFh

0000 0000

RDTF

Remote Diode Temperature Filter

FEh

0000 0001

RMID

Read Manufacturer's ID

FFh

LM89C 0011 0001

RDR

Read Stepping or Die Revision Code

LM89-1C 0011 0100

LM89-1D 0011 0101

9.6.2 Local And Remote Temperature Registers (LT, RTHB, RTLB)

Table 2. Local And Remote Temperature Registers (LT, RTHB) (Read Only Address 00h, 01h):

BIT

Value

SIGN

For LT and RTHB D7–D0: Temperature Data. LSB = 1°C. Two's complement format.

Table 3. Local And Remote Temperature Registers (RTLB) (Read Only Address 10h):

BIT

Value

0.5

0.25

0.125

For RTLB D7–D5: Temperature Data. LSB = 0.125°C. Two's complement format.

The maximum value available from the Local Temperature register is 127; the minimum value available from the

Local Temperature register is -128. The maximum value available from the Remote Temperature register is

127.875; the minimum value available from the Remote Temperature registers is

−128.875.

9.6.3 Status Register (SR)

Table 4. Status Register (SR) (Read Only Address 02h):

Bit

Value

Busy

LHIGH

LLOW

RHIGH

RLOW

OPEN

RCRIT

LCRIT

Power up default is with all bits “0” (zero).

D7: Busy: When set to “1” ADC is busy converting.

D6: LHIGH: When set to “1” indicates a Local HIGH Temperature alarm.

D5: LLOW: When set to “1” indicates a Local LOW Temperature alarm.

D4: RHIGH: When set to “1” indicates a Remote Diode HIGH Temperature alarm.

D3: RLOW: When set to “1” indicates a Remote Diode LOW Temperature alarm

D2: OPEN: When set to “1” indicates a Remote Diode disconnect.

D1: RCRIT: When set to “1” indicates a Remote Diode Critical Temperature alarm.

D0: LCRIT: When set to “1” indicates a Local Critical Temperature alarm.

9.6.4 Configuration Register

Table 5. Configuration Register (Read Address 03h /Write Address 09h):

Bit

Value

ALERT mask

RUN/STOP

Remote

Local

Fault Queue

T_CRIT_A

mask

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