LM63 datasheet(26/41 Pages) TI

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LM63

SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

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Table 9. Remote Diode Temperature, Offset And Setpoint Registers

ADDRESS

READ/

POR

BITS

NAME

DESCRIPTION

HEX

WRITE

VALUE

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

Remote Diode

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

Read Only

7:0

N/A

Temperature

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

Reading (MSB)

This byte to be read first. The LM63C and LM63D will report the actual

thermal diode temperature.

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

Remote Diode

7:5

N/A

weight 0.5°C, bit 6 has a weight of 0.25°C, and bit 5 has a weight of

Read Only

Temperature

0.125°C.

Reading (MSB)

4:0

Always 00.

Remote

These registers contain the value added to or subtracted from the

R/W

7:5

Temperature

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

OFFSET (MSB)

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

Remote

7:5

temperature reading contained in registers 01 and 10.

R/W

Temperature

4:0

OFFSET (LSB)

Always 00.

0x46

Remote HIGH

07 (0D)

R/W

7:0

High setpoint temperature for remote diode. Same format as Remote

(70°C)

Setpoint (MSB)

Temperature Reading (registers 01 and 10).

7:5

Remote HIGH

R/W

Setpoint (LSB)

4:0

Always 00.

Remote LOW

08 (0E)

R/W

7:0

Low setpoint temperature for remote diode. Same format as Remote

(0°C)

Setpoint (MSB)

Temperature Reading (registers 01 and 10).

7:5

Remote LOW

R/W

Setpoint (LSB)

4:0

Always 00.

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

0x55

Remote Diode

R/W

7:0

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

(85°C)

T_CRIT Limit

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

again except by cycling power to the LM63.

Remote Diode

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

0x0A

R/W

7:0

T_CRIT

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

(10°C)

Hysteresis

Hysteresis)].

7:3

00000

These bits are unused and should always set to 0.

00: Filter Disabled

Remote Diode

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

2:1

Temperature

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

Filter

R/W

11: Filter Level 2 (maximum filtering)

0: the ALERT/Tach pin functions normally.

Comparator

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

Mode

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

condition goes away.

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