Rainbow-electronics LM92 Manual de usuario descargar pdf (Pagina 12)

1.0 Functional Description (Continued)

1.9 POINTER REGISTER

(Selects which registers will be read from or written to):

P7 P6 P5 P4 P3 P2 P1 P0

00000 Register Select

P0–P2: Register Select:

P2 P1 P0 Register

0 0 0 Temperature (Read only) (Power-up

default)

0 0 1 Configuration (Read/Write)

010T

HYST

(Read/Write)

0 1 1 T_CRIT (Read/Write)

100T

LOW

(Read/Write)

101T

HIGH

(Read/Write)

1 1 1 Manufacturer’s ID

P3–P7: Must be kept zero.

1.10 TEMPERATURE REGISTER

(Read Only):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Sign MSB Bit

Bit 9 Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

CRIT HIGH LOW

Status Bits

D0–D2: Status Bits

D3–D15: Temperature Data. One LSB = 0.0625˚C. Two’s complement format.

1.11 CONFIGURATION REGISTER

(Read/Write):

D7 D6 D5 D4 D3 D2 D1 D0

0 0 0 Fault Queue INT Polarity T_CRIT_A

Polarity

INT Mode Shutdown

D0: Shutdown - When set to 1 the LM92 goes to low power shutdown mode. Power up default of “0”.

D1: Interrupt mode-0isComparator Interrupt mode, 1 is Event Interrupt mode. Power up default of “0”.

D2, D3: T_CRIT_A and INT Polarity-0isactive 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

HYST

LOW

HIGH

AND T_CRIT_A REGISTERS

(Read/Write):

D15 D14 D13 D12 D11 D10 D9 D8 D7 D6 D5 D4 D3 D2 D1 D0

Sign MSB Bit

Bit 9 Bit 8 Bit7 Bit6 Bit5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 X X X

D0–D2: Undefined

D3–D15: T

HYST

LOW

HIGH

or T_CRIT Trip Temperature Data. Power up default is T

LOW

= 10˚C, T

HIGH

= 64˚C, T_CRIT = 80˚C,

HYST

= 2˚C.

HYST

is subtracted from T

HIGH

, and T_CRIT, and added to T

LOW

Avoid programming setpoints so close that their hysteresis values overlap. See

Section 1.1

LM92

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