LM63 datasheet(19/28 Pages) NSC

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2.0 LM63 Registers (Continued)

Configuration Register

ADDRESS

Hex

Read/

Write

Bits

POR

Value

Name

Description

03 (09)

HEX CONFIGURATION REGISTER

03 (09)

R/W

ALERT

Mask

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

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

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

STANDBY

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.

In STANDBY, continuous conversions are stopped, but a

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

the setting of bit 5 in this register.

PWM Disable

in STANDBY

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

current fan control signal while 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.

ALERT/Tach

Select

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

output.

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

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.

T_CRIT Limit

Override

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, then

programming a new T_CRIT value into the Remote Diode T_CRIT Limit

(register 0x19). The T_CRIT value can not be changed again except by

cycling power to the LM63.

RDTS Fault

Queue

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

above the Remote High Set Point or below the Remote Low

Setpoint.

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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