LM64 datasheet(22/29 Pages) NSC

22 / 29 page

2.0 LM64 Registers (Continued)

Local Temperature And Local High Setpoint Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

HEX LOCAL TEMPERATURE REGISTER (8-bits)

Read

Only

7:0

N/A

Local Temperature Reading (8-bit)

8-bit temperature of the LM64.

05 (0B)

HEX LOCAL HIGH SETPOINT REGISTER (8-bits)

R/W

7:0

0x46

(70˚)

Local HIGH Setpoint

High Setpoint for the internal diode.

Remote Diode Temperature, Offset And Setpoint Registers

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

Read

Only

7:0

N/A

Remote Diode

Temperature

Reading (MSB)

This is the MSB of the LM64 remote diode temperature value, 2’s

complement. Bit 7 is the sign bit, bit 6 has a weight 64˚C, and bit 0 has

a weight of 1˚C. Read this byte first. The actual remote diode

temperature is 16˚C higher than the values in registers 0x01 and 0x10.

Read

Only

7:5

N/A

Remote Diode

Temperature

Reading (LSB)

This is the LSB of the LM64 remote diode temperature value, in 2’s

complement. Bit 7 has a weight 0.5˚C, bit 6 has a weight of 0.25˚C, and

bit 5 has a weight of 0.125˚C. The actual remote diode temperature is

16˚C higher than the values in registers 0x01 and 0x10.

4:0

Always 00.

R/W

7:5

Remote

Temperature

OFFSET (MSB)

These registers contain the offset value added to, or subtracted from, the

remote diode’s reading to compensate for the different non-ideality

factors of different processors, diodes, etc. The 2’s complement value, in

these registers is added to the output of the LM64’s ADC to form the

temperature reading contained in registers 01 and 10.

R/W

7:5

Remote

Temperature

OFFSET (LSB)

4:0

Always 00.

07 (0D)

R/W

7:0

0x46

(70˚C)

Remote HIGH

Setpoint (MSB)

High setpoint temperature for remote diode. Same format as Remote

Temperature Reading (registers 01 and 10).

R/W

7:5

Remote HIGH

Setpoint (LSB)

4:0

Always 00.

08 (0E)

R/W

7:0

(0˚C)

Remote LOW

Setpoint (MSB)

Low setpoint temperature for remote diode. Same format as Remote

Temperature Reading (registers 01 and 10).

R/W

7:5

Remote LOW

Setpoint (LSB)

4:0

Always 00.

R/W

7:0

0x55

(85˚C)

Remote Diode

T_CRIT Limit

This 8-bit integer storing the T_CRIT limit is initially 85˚C (101˚C actual

remote T_Crit limit). This value can be changed at any time after

power-up.

R/W

7:0

0x0A

(10˚C)

Remote Diode

T_CRIT

Hysteresis

8-bit integer storing T_CRIT hysteresis. T_CRIT stays activated until the

remote diode temperature goes below [(T_CRIT Limit) — (T_CRIT

Hysteresis)].

R/W

7:3

00000

These bits are unused and should always set to 0.

2:1

Remote Diode

Temperature

Filter

00: Filter Disabled

01: Filter Level 1 (minimal filtering, same as 10)

10: Filter Level 1 (minimal filtering, same as 01)

11: Filter Level 2 (maximum filtering)

Comparator

Mode

0: the ALERT pin functions as an Interrupt or ARA mode.

1: the ALERT pin behaves as a comparator, asserting itself when an

ALERT condition exists, de-asserting itself when the ALERT condition

goes away.

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