2.2 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.

2.3 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.

2.4 MANUFACTURERS ID and DIE REVISION(Stepping)

REGISTERS

(Read Address FEh and FFh) Default value 01h for Manufacturers ID(FEh ).

2.5 CONFIGURATION REGISTER

(Read Address 03h/Write Address 09h):

D7

D6

D5

D4

D3

D2

D1

D0

INT mask

0

Remote

T_CRIT_A

mask

Remote

T_CRIT_A

mask

Remote

T_CRIT_A

mask

Local

T_CRIT_A

mask

INT Inversion

0

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 func-

tion properly.

D4: T_CRIT mask for Remote temperature, when set to 1 a remote temperature reading that exceeds T_CRIT setpoint will not

activate the T_CRIT_A pin.

D3: 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 func-

tion properly.

D2: T_CRIT mask for Local reading, when set to 1 a Local temperature reading that exceeds T_CRIT setpoint will not activate

the T_CRIT_A pin.

D1: INT active state inversion. When INT Inversion is set to a 1 the active state of the INT output will be a logical high. A low would

then select an active state of a logical low.

D6 and D0: These bits are always set to 0 and reserved for future use. A write of 1 will return a 0 when read.

2.6 LOCAL, and REMOTE HIGH SETPOINT REGISTERS (LHS, RHS)

(Read Address 05h, 07h/Write Address 0Bh, 0Dh):

D7

D6

D5

D4

D3

D2

D1

D0

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

D7–D0: HIGH setpoint temperature data. Power up default is LHIGH = RHIGH=127˚C.

2.7 T_CRIT REGISTER (TCS)

(Read Address 42h/Write Address 5Ah):

D7

D6

D5

D4

D3

D2

D1

D0

MSB

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

LSB

D7–D0: T_CRIT setpoint temperature data. Power up default is T_CRIT = 127˚C.

www.national.com

13