LM63 datasheet(21/28 Pages) NSC

21 / 28 page

2.0 LM63 Registers (Continued)

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 2’s complement value, representing the

temperature of the remote diode connected to the LM63. Bit 7 is the sign

bit, bit 6 has a weight of 0x40 (64˚), and bit 0 has a weight of 1˚C. This

byte to be read first.

Read

Only

7:5

N/A

Remote Diode

Temperature

Reading (MSB)

This is the LSB of the 2’s complement value, representing the

temperature of the remote diode connected to the LM63. 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.

4:0

Always 00.

R/W

7:5

Remote

Temperature

OFFSET (MSB)

These registers contain the 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 LM63’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 nominally 85˚C. This value

can be changed once after power-up by setting T_CRIT Limit Override

(bit 1) in the Configuration register to a 1, then programming a new

T_CRIT value into this register. The T_CRIT Limit can not be changed

again except by cycling power to the LM63.

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/Tach pin functions normally.

1: the ALERTTach 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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