LM76CNMX-3 National Semiconductor, LM76CNMX-3 Datasheet - Page 10

• Manufacturer Part Number: LM76CNMX-3
• Description: 0.5C/ 1C/ 12-Bit Sign Digital Temperature Sensor and Thermal Window Comparator with Two-Wire Interface
• Manufacturer: National Semiconductor

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1.0 Functional Description
1.9 POINTER REGISTER
(Selects which registers will be read from or written to):
P0–P2: Register Select:
P3–P7: Must be kept zero.
1.10 TEMPERATURE REGISTER
D0–D2: Status Bits
D3–D15: Temperature Data. One LSB = 0.0625˚C. Two’s complement format.
1.11 CONFIGURATION REGISTER
D0: Shutdown - When set to 1 the LM76 goes to low power shutdown mode. Power up default of “0”.
D1: Interrupt mode - 0 is Comparator Interrupt mode, 1 is Event Interrupt mode. Power up default of “0”.
D2, D3: T_CRIT_A and INT Polarity - 0 is active low, 1 is active high. Outputs are open-drain. Power up default of “0”
D4: Fault Queue - When set to 1 the Fault Queu is enabled,
see Section 1.7 . Power up default of “0”.
D5–D7: These bits are used for production testing and must be kept zero for normal operation.
1.12 T
D0–D2: Undefined
D3–D15: T
T
T
Avoid programming setpoints so close that their hysteresis values overlap. See Section 1.1 .
(Read Only):
(Read/Write):
Sign
Sign
HYST
HYST
D15
(Read/Write):
D15
HYST
D7
is subtracted from T
= 2˚C.
0
MSB
MSB
D14
D14
HYST
, T
LOW
, T
D13
D13
, T
LOW
Bit
10
Bit
10
HIGH
, T
D6
0
HIGH
Bit 9
Bit 9
D12
D12
AND T_CRIT_A REGISTERS
HIGH
or T_CRIT Trip Temperature Data. Power up default is T
, and T_CRIT, and added to T
P2
0
0
0
0
1
1
Bit 8
Bit 8
D11
D11
P7
0
D5
0
P1
0
0
1
1
0
0
Bit 7
D10
D10
Bit7
P6
0
(Continued)
P0
0
1
0
1
0
1
Fault Queue
Bit 6
Bit6
P5
D9
D9
0
Temperature (Read only) (Power-up
default)
Configuration (Read/Write)
T
T_CRIT (Read/Write)
T
T
D4
HYST
LOW
HIGH
Bit 5
Bit5
P4
D8
D8
0
(Read/Write)
(Read/Write)
(Read/Write)
LOW
10
INT Polarity
.
Bit 4
Bit 4
P3
0
D7
D7
Register
D3
P2
Bit 3
Bit 3
D6
D6
Register Select
P1
T_CRIT_A
Bit 2
Bit 2
D5
D5
Polarity
LOW
D2
= 10˚C, T
P0
Bit 1
Bit 1
D4
D4
Bit 0
INT Mode
Bit 0
HIGH
D3
D3
D1
= 64˚C, T_CRIT = 80˚C,
CRIT
D2
D2
X
Status Bits
Shutdown
HIGH
D1
D1
X
D0
LOW
D0
D0
X