Datasheet

Table Of Contents

LM90

SNIS126A –MAY 2004–REVISED MARCH 2013

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D7: Busy: When set to “1” ADC is busy converting.

CONFIGURATION REGISTER

Table 4. CONFIGURATION REGISTER (Read Address 03h /Write Address 09h):

D7 D6 D5 D4 D3 D2 D1 D0

ALERT mask RUN/STOP 0 Remote 0 Local 0 Fault Queue

T_CRIT_A T_CRIT_A

mask mask

Power up default is with all bits “0” (zero)

D7: ALERT mask: When set to “1” ALERT interrupts are masked.

D6: RUN/STOP: When set to “1” SHUTDOWN is enabled.

D5: is not defined and defaults to “0”.

D4: Remote T_CRIT mask: When set to “1” a diode temperature reading that exceeds T_CRIT setpoint will not

activate the T_CRIT_A pin.

D3: is not defined and defaults to “0”.

D2: Local T_CRIT mask: When set to “1” a Local temperature reading that exceeds T_CRIT setpoint will not

activate the T_CRIT_A pin.

D1: is not defined and defaults to “0”.

D0: Fault Queue: when set to “1” three consecutive remote temperature measurements outside the HIGH, LOW,

or T_CRIT setpoints will trigger an “Outside Limit” condition resulting in setting of status bits and associated

output pins..

CONVERSION RATE REGISTER

Table 5. CONVERSION RATE REGISTER (Read Address 04h /Write Address 0Ah)

Value Conversion Rate

00 62.5 mHz

01 125 mHz

02 250 mHz

03 500 mHz

04 1 Hz

05 2 Hz

06 4 Hz

07 8 Hz

08 16 Hz

09 32 Hz

10-255 Undefined

LOCAL and REMOTE HIGH SETPOINT REGISTERS (LHS, RHSHB, and RHSLB)

Table 6. LOCAL and REMOTE HIGH SETPOINT REGISTERS (LHS, RHSHB) (Read Address 05h, 07h /Write

Address 0Bh, 0Dh):

BIT D7 D6 D5 D4 D3 D2 D1 D0

Value SIGN 64 32 16 8 4 2 1

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