LM63 datasheet(24/41 Pages) TI

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LM63

SNAS190E – SEPTEMBER 2002 – REVISED MAY 2013

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Table 6. Configuration Register

ADDRESS

READ/

POR

BITS

NAME

DESCRIPTION

HEX

WRITE

VALUE

03 (09)HEX CONFIGURATION REGISTER

When this bit is a 0, ALERT interrupts are enabled.

ALERT

When this bit is set to a 1, ALERT interrupts are masked, and the

Mask

ALERT pin is always in a high-impedance (open) state.

When this bit is a 0, the LM63 is in operational mode, converting,

comparing, and updating the PWM output continuously.

When this bit is a 1, the LM63 enters a low-power standby mode.

STANDBY

In STANDBY, continuous conversions are stopped, but a

conversion/comparison cycle may be initiated by writing any value to

on the setting of bit 5 in this register.

When this bit is a 0, the LM63’s PWM output continues to output the

PWM Disable

current fan control signal while in STANDBY.

in STANDBY

When this bit is a 1, the PWM output is disabled (as defined by the

PWM polarity bit) while in STANDBY.

4:3

These bits are unused and always set to 0.

When this bit is a 0, the ALERT/Tach pin is an open drain ALERT

03 (09)

R/W

output.

ALERT/Tach

When this bit is a 1, the ALERT/Tach pin is a high-impedance

Select

Tachometer input.

Note that if this bit is set, the function of the ALERT/Tach pin must be

Tach input, so an external ALERT condition will not occur.

The T_CRIT limit for the remote diode is nominally 85°C. This value

can be changed once after power-up by first setting this bit to a 1,

T_CRIT Limit

then programming a new T_CRIT value into the Remote Diode

Override

T_CRIT Limit (register 0x19). The T_CRIT value can not be changed

again except by cycling power to the LM63.

0: an ALERT will be generated if any Remote Diode conversion result

is above the Remote High Set Point or below the Remote Low

RDTS Fault

Setpoint.

Queue

1: an ALERT will be generated only if three consecutive Remote

Diode conversions are above the Remote High Set Point or below

the Remote Low Setpoint.

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