LM87 datasheet(12/45 Pages) TI2

12 / 45 page

LM87

SNAS034J – APRIL 2000 – REVISED MARCH 2013

www.ti.com

Internal Registers of the LM87

Table 1. The internal registers and their corresponding internal LM87 addresses are as follows:

LM87 Internal Hex

Power on

Notes

Address

Value

Internal Temp. Hardware High

13h

0100 0110

70 °C Default - User adjustable. Lockable by setting bit 1

Limit

of register 4Ah.

External Temp. Hardware High

14h

0101 0101

85 °C Default - User adjustable. Lockable by setting bit 2

Limit

of register 4Ah.

Test Register

15h

0000 0000

Channel Mode Register

16h

0000 0000

Internal Temp. Hardware High

17h

0100 0110

70 °C Default - User adjustable.

Limit

External Temp. Hardware High

18h

0101 0101

85 °C Default - User adjustable.

Limit

Value RAM DAC Data Register

19h

1111 1111

Defaults to full scale DAC setting.

Value RAM

1Ah-3Fh

(See Value RAM—Address 19h–3Fh) Contains: monitoring

results (temperature, voltages, fan counts), WATCHDOG

limits, and Company/Stepping IDs

Company ID

3Eh

0000 0010

This designates the Texas Instruments LM87.

Revision

3Fh

0000 0110

Revisions of this device will start with 1 and increment by

one.

Configuration Register 1

40h

0000 1000

Interrupt Status Register 1

41h

0000 0000

Interrupt Status Register 2

42h

0000 0000

Interrupt Mask Register 1

43h

0000 0000

Interrupt Mask Register 2

44h

0000 0000

CI Clear Register

46h

0000 0000

VID0-3/Fan Divisor Register

47h

0101 XXXX

The upper four bits set the divisor for Fan Counters 1 and

2. The lower four bits reflect the state of the VID0-VID3

inputs.

VID4 Register

49h

1000 000X

The lower bit reflects the state of VID4 input.

Configuration Register 2

4Ah

0000 0000

Interrupt Status Register 1

4Ch

0000 0000

Mirror

Interrupt Status Register 2

4Dh

0000 0000

Mirror

SMBALERT# Enable

80h

0010 0000

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