LM99

SNIS129D – JANUARY 2003 – REVISED MARCH 2013

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D6: LHIGH: When set to “1” indicates a Local HIGH Temperature alarm.

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

CONFIGURATION REGISTER

Table 6. (Read Address 03h / Write Address 09h):

D7

D6

D5

D4

D3

D2

D1

D0

Remote T_CRIT_A

Local T_CRIT_A mask

ALERT mask

RUN/STOP

0

0

0

Fault Queue

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_A mask: When set to “1” a diode temperature reading that exceeds T_CRIT_A setpoint will

not activate the T_CRIT_A pin.

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

D2: Local T_CRIT_A mask: When set to “1” a Local temperature reading that exceeds T_CRIT_A 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 7. (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 8. (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

For LHS and RHSHB: HIGH setpoint temperature data. Power-on default is LHIGH = RHIGH = 70°C. 1 LSB =

1°C. Two's complement format.

18

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