LM89

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SNIS128D – AUGUST 2002 – REVISED JUNE 2014

Device Functional Modes (continued)

2. Local Temperature set to 0°C

3. Remote Diode Temperature set to 0°C until the end of the first conversion.

4. Status Register set to 00h.

5. Configuration register set to 00h; ALERT enabled, Remote T_CRIT alarm enabled and Local T_CRIT alarm

enabled

6. 85°C Local T_CRIT temperature setpoint for LM89C and LM89-1C; 105°C Local T_CRIT temperature

setpoint for LM89-1D

7. 110°C Remote T_CRIT temperature setpoint

8. 70°C Local and Remote HIGH temperature setpoints

9. 0°C Local and Remote LOW temperature setpoints

10. Filter and Alert Configure Register set to 00h; filter disabled, ALERT output set as an SMBus ALERT

11. Conversion Rate Register set to 8h; conversion rate set to 16 conv./sec.

9.5 Programming

9.6 Register Maps

9.6.1 Command Register

Selects which registers will be read from or written to. Data for this register should be transmitted during the

Command Byte of the SMBus write communication.

P7

P6

P5

P4

P3

P2

P1

P0

Command Select

P0-P7: Command Select

Command Select Address

Power-On-Default State

Register

Register Function

Name

Read Address

Write Address

<D7:D0> binary

<D7:D0>

<P7:P0> hex

<P7:P0> hex

decimal

00h

NA

0000 0000

0

LT

Local Temperature

01h

NA

0000 0000

0

RTHB

Remote Temperature High Byte

02h

NA

0000 0000

0

SR

Status Register

03h

09h

0000 0000

0

C

Configuration

04h

0Ah

0000 1000

8 (16

CR

Conversion Rate

conv./sec)

05h

0Bh

0100 0110

70

LHS

Local HIGH Setpoint

06h

0Ch

0000 0000

0

LLS

Local LOW Setpoint

07h

0Dh

0100 0110

70

RHSHB

Remote HIGH Setpoint High Byte

08h

0Eh

0000 0000

0

RLSHB

Remote LOW Setpoint High Byte

NA

0Fh

One Shot

Writing to this register will initiate a

one shot conversion

10h

NA

0000 0000

0

RTLB

Remote Temperature Low Byte

11h

11h

0000 0000

0

RTOHB

Remote Temperature Offset High

Byte

12h

12h

0000 0000

0

RTOLB

Remote Temperature Offset Low

Byte

13h

13h

0000 0000

0

RHSLB

Remote HIGH Setpoint Low Byte

14h

14h

0000 0000

0

RLSLB

Remote LOW Setpoint Low Byte

19h

19h

0110 1110

110

RCS

Remote T_CRIT Setpoint

20h

20h

LM89C 0101 0101

85

LCS

Local T_CRIT Setpoint

LM89-1C 0101 0101

85

LM89-1D 0110 1001

105

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