Datasheet

LM82

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SNIS113D –JANUARY 2000–REVISED MARCH 2013

Command Select Power On Default State Register Name Register Function

Address

<P7:P0> hex <D7:D0> binary <D7:D0> decimal

50h 0111 1111 127 Reserved

51h Reserved for Future Use

52h 0111 1111 127 Reserved

53h-59h Reserved for Future Use

5Ah 0111 1111 127 WTCS Write T_CRIT Setpoint

5Ch-6Fh and F0h- Reserved for Future Use

FDh

FEh 0000 0001 1 RMID Read Manufacturers ID

FFh 0000 0011 3 RSR Read Stepping or Die Revision Code

LOCAL and REMOTE TEMPERATURE REGISTERS (LT, and RT)

Table 1. LOCAL and REMOTE TEMPERATURE REGISTERS (LT, and RT) (Read Only Address 00h, and

01h):

D7 D6 D5 D4 D3 D2 D1 D0

MSB Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 LSB

D7–D0: Temperature Data. One LSB = 1°C. Two's complement format.

STATUS REGISTER

Table 2. STATUS REGISTER (Read Only Address 02h):

D7 D6 D5 D4 D3 D2 D1 D0

0 LHIGH 0 RHIGH 0 OPEN RCRIT LCRIT

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

D0: LCRIT: When set to a 1 indicates an Local Critical Temperature alarm.

D1: RCRIT: When set to a 1 indicates a Remote Diode Critical Temperature alarm.

D2: D2OPEN: When set to 1 indicates a Remote Diode disconnect.

D4: D2RHIGH: When set to 1 indicates a Remote Diode HIGH Temperature alarm.

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

D7, D5, and D3: These bits are always set to 0 and reserved for future use.

MANUFACTURERS ID AND DIE REVISION (Stepping) REGISTERS

MANUFACTURERS ID AND DIE REVISION (Stepping) REGISTERS (Read Address FEh and FFh) Default

value 01h for Manufacturers ID(FEh ).

CONFIGURATION REGISTER

Table 3. CONFIGURATION REGISTER (Read Address 03h/Write Address 09h):

D7 D6 D5 D4 D3 D2 D1 D0

INT mask 0 Remote Remote Remote Local INT Inversion 0

T_CRIT_A T_CRIT_A T_CRIT_A T_CRIT_A

mask mask mask mask

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

D7: INT mask: When set to 1 INT interrupts are masked.

D5: T_CRIT mask, this bit must be set to a 1 before the T_CRIT setpoint is lowered below 127 in order for

T_CRIT_A pin to function properly.

Product Folder Links: LM82