Rainbow-electronics LM86 Manual de usuario descargar pdf (Pagina 13)

1.0 Functional Description (Continued)

1.12 Fault Queue

In order to suppress erroneous ALERT or T_CRIT triggering

the LM86 incorporates a Fault Queue. The Fault Queue acts

to insure a remote temperature measurement is genuinely

beyond a HIGH, LOW or T_CRIT setpoint by not triggering

until three consecutive out of limit measurements have been

made, see Figure 10. The fault queue defaults off upon

power-up and may be activated by setting bit D0 in the

Configuration register (09h) to “1”.

1.13 One-Shot Register

The One-Shot register is used to initiate a single conversion

and comparison cycle when the device is in standby mode,

after which the device returns to standby. This is not a data

conversion. The data written to this address is irrelevant and

is not stored. A zero will always be read from this register.

2.0 LM86 REGISTERS

2.1 COMMAND REGISTER

Selects which registers will be read from or written to. Data for this register should be transmitted during the Command Byte of

the SMBus write communication.

P7 P6 P5 P4 P3 P2 P1 P0

Command Select

P0-P7: Command Select

Command Select Address Power On Default State Register

Name

Read Address

P7:P0

hex

Write Address

P7:P0

hex

D7:D0

binary

D7:D0

decimal

00h NA 0000 0000 0 LT Local Temperature

01h NA 0000 0000 0 RTHB Remote Temperature High Byte

02h NA 0000 0000 0 SR Status Register

03h 09h 0000 0000 0 C Configuration

04h 0Ah 0000 1000 8 (16 conv./sec) CR Conversion Rate

05h 0Bh 0100 0110 70 LHS Local HIGH Setpoint

06h 0Ch 0000 0000 0 LLS Local LOW Setpoint

07h 0Dh 0100 0110 70 RHSHB Remote HIGH Setpoint High

Byte

08h 0Eh 0000 0000 0 RLSHB Remote LOW Setpoint High

Byte

NA 0Fh One Shot Writing to this register will

initiate a one shot conversion

10h NA 0000 0000 0 RTLB Remote Temperature Low Byte

10130330

FIGURE 10. Fault Queue Temperature Response

Diagram

LM86

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