Rainbow Electronics LM86 - Manual (Page 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
register and it is the write operation that causes the one-shot
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
Register Function
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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